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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

LOUDSPEAKER CROSSOVER & FILTER
x   CROSSOVER (LOUDSPEAKER)
xx   FILTER (ELECTRONIC)
xx   FREQUENCY DIVIDER
xx   LOUDSPEAKER
xx   LOUDSPEAKER WIRING

Electronic crossovers and multi-amplifier approach. Active and passive designs for dividing the signal before the power amplifier (instead of at the speaker).
AUDIO AMATEUR 2/1972 [Jan 1973] (v.3#2) pg. 10
Correction AUDIO AMATEUR 4/1973 [Aug 1974] (v.4#4) pg. 27

Tip on using oil-filled capacitors and iron-core inductors on crossover circuits.
AUDIO AMATEUR 1/1975 [Jun 1975] (v.6#1) pg. 30

Classic circuitry. Schematic for the Heathkit Electronic Crossover model XO-1.
AUDIO AMATEUR 3/1975 [Jan 1976] (v.6#3) pg. 40
Added Info AUDIO AMATEUR 2/1976 [Jul 1976] (v.7#2) pg. 39

Classic circuitry. Schematic for the Marantz electronic crossover.
AUDIO AMATEUR 4/1975 [Mar 1976] (v.6#4) pg. 38
Added Info AUDIO AMATEUR 1/1977 [Feb 1977] (v.8#1) pg. 47
Added Info AUDIO AMATEUR 4/1978 [Nov 1978] (v.9#4) pg. 52

Classic circuitry. Schematic for the EC-3 electronic crossover manufactured by Audio Research Corp. (circa 1973).
AUDIO AMATEUR 3/1976 [Oct 1976] (v.7#3) pg. 35

How to take voice coil inductance into account in crossover design.
AUDIO AMATEUR 1/1977 [Feb 1977] (v.8#1) pg. 34

Super crossover circuit features variable gain, plenty of current to drive a 600-ohm load, and an input matching stage for consistent performance.
AUDIO AMATEUR 2/1977 [May 1977] (v.8#2) pg. 42

Circuit to combine the bass channels in an Old Colony electronic crossover.
AUDIO AMATEUR 3/1977 [Aug 1977] (v.8#3) pg. 49

Big bass box. A large speaker enclosure (48" wide, 24" deep, 72" tall) incorporates a 12-ft. tapered transmission line and a 24" diameter Hartley driver. An active crossover circuit has adjustable gain and equalized response. Produces clean sound in the 20-40 Hz range.
AUDIO AMATEUR 2/1978 [Jun 1978] (v.9#2) pg. 4

Crossover coil values. One method for measuring using a precision resistor, an audio oscillator, and a VTVM.
AUDIO AMATEUR 3/1978 [Sep 1978] (v.9#3) pg. 44

A vacuum tube, variable frequency electronic crossover system.
AUDIO AMATEUR 3/1979 [Jul 1979] (v.10#3) pg. 6
Correction AUDIO AMATEUR 4/1979 [Oct 1979] (v.10#4) pg. 55
Added Info AUDIO AMATEUR 1/1982 [Jan 1982] (v.13#1) pg. 61

A dynamic range and clipping indicator uses LED's to display the results. The unit combines electronic crossovers with circuit-board versions of dynamic range/clipping indicators.
AUDIO AMATEUR 1/1980 [Jan 1980] (v.11#1) pg. 14

Tips on locating and using the new polypropylene, polystyrene and/or Teflon dielectrics (capacitors) in crossover networks and other audio circuits.
AUDIO AMATEUR 1/1982 [Jan 1982] (v.13#1) pg. 52

Schematic for a low level 80Hz crossover for subwoofers.
AUDIO AMATEUR 2/1982 [May 1982] (v.13#2) pg. 56

Test report on the Heath AD-1702 variable electronic crossover kit.
AUDIO AMATEUR 3/1983 [Sep 1983] (v.14#3) pg. 44

A modular electronic crossover. Features an expandable motherboard into which circuit cards containing filters or buffers are plugged.
AUDIO AMATEUR 5/1983 [Jan 1984] (v.14#5) pg. 20
Added Info AUDIO AMATEUR 2/1984 [May 1984] (v.15#2) pg. 53

Gilding the TDA 2030. Using the TDA 2030 monolithic integrated circuit (IC) low-power hi-fi amplifier in an active-crossover speaker system to drive the super tweeter, tweeter, or midrange. Adding a 5534 op amp results in lower distortion. Two circuits shown.
AUDIO AMATEUR 3/1984 [Jul 1984] (v.15#3) pg. 30

A phono preamp/crossover combined in one unit.
AUDIO AMATEUR 5/1984 [Oct 1984] (v.15#5) pg. 25

A first-order, all-pass filter keeps the output in phase with the input over a greater portion of the audio spectrum.
AUDIO AMATEUR 4/1985 [Oct 1985] (v.16#4) pg. 43
Added Info AUDIO AMATEUR 2/1986 [May 1986] (v.17#2) pg. 49

Audio components design. A systems approach. Looks at the traditional audio chain, the crossover, the preamp, and the crossover filter.
AUDIO AMATEUR 2/1988 [May 1988] (v.19#2) pg. 27
Added Info AUDIO AMATEUR 3/1989 [Aug 1989] (v.20#3) pg. 58
Added Info AUDIO AMATEUR 3/1994 [Sep 1994] (v.25#3) pg. 48

Tips on improving an SAE 4000 active two-way crossover.
AUDIO AMATEUR 3/1989 [Aug 1989] (v.20#3) pg. 38

Tips on using Linear Technology's LT1086CT (positive) and LT337AT (negative) regulators in an active crossover power supply.
AUDIO AMATEUR 1/1993 [Mar 1993] (v.24#1) pg. 41

New approach to line amps and DACs. Design and construction of a combined line amp and crossover combination which features two dual buffers (one set for subwoofer output and the other for tape output). Also suitable for use as the analog part of an outboard DAC (digital-to-analog converter).
AUDIO ELECTRONICS 4/1998 [Aug 1998] (v.29#4) pg. 8

Improving the 24dB/octave Linkwitz/Riley crossover.
AUDIO ELECTRONICS 3/2000 [May 2000] (v.31#3) pg. 47
Correction AUDIO ELECTRONICS 4/2000 [Jul 2000] (v.31#4) pg. 47

A bass-boosting network. Designing and testing a passive bass-boosting filter network that allows you to build a sealed-box bookshelf speaker system with an acceptable frequency corresponding to half-power in the bass range, and excellent transient response.
AUDIOXPRESS Apr 2001 (v.32#4) pg. 24
Added Info AUDIOXPRESS Aug 2001 (v.32#8) pg. 80
Added Info AUDIOXPRESS Oct 2001 (v.32#10) pg. 85 (Silicone sealant choices)

The virtual crossover. Introduction to the theory behind computer modeling of both active and passive crossovers. Part 1.
AUDIOXPRESS May 2001 (v.32#5) pg. 8

A transient-perfect second-order passive crossover. Design rules for two-way speaker systems.
AUDIOXPRESS May 2001 (v.32#5) pg. 22

Inductor coupling. Measuring signal coupling (crosstalk) for various orientations and spacings of typical air, ferrite, and iron-core crossover inductors, and the effects of such coupling.
AUDIOXPRESS May 2001 (v.32#5) pg. 42

The virtual crossover. Part 2. Hardware implementation using available DSP (digital signal processing) chips.
AUDIOXPRESS Jun 2001 (v.32#6) pg. 20

The virtual crossover. Part 3. Implement a crossover for a Roger Sanders-type hybrid ESL/TL speaker.
AUDIOXPRESS Jul 2001 (v.32#7) pg. 64

Zobel power dissipation. Technical advice concerning Zobel networks in two-way crossovers.
AUDIOXPRESS Aug 2001 (v.32#8) pg. 89
Added Info AUDIOXPRESS Apr 2002 (v.33#4) pg. 63

A new crossover for the Cambridge Soundworks Model Six loudspeaker.
AUDIOXPRESS Oct 2001 (v.32#10) pg. 50

A first-order 3-way. A relatively simple speaker construction project using first-order crossovers. Part 1.
AUDIOXPRESS Nov 2001 (v.32#11) pg. 24
Added Info AUDIOXPRESS Jun 2002 (v.33#6) pg. 72 (Driver substitution)

A first-order 3-way. A relatively simple speaker construction project using first-order crossovers. Part 2. Construction details.
AUDIOXPRESS Dec 2001 (v.32#12) pg. 50

A passive, low level crossover. Crosses over at 40Hz, sums the L and R bass channels for a true center subwoofer channel, allows channel balancing, etc.
AUDIOXPRESS Nov 2002 (v.33#11) pg. 16
Added Info AUDIOXPRESS May 2003 (v.34#5) pg. 65

Design an active transient-perfect second-order crossover.
AUDIOXPRESS Dec 2002 (v.33#12) pg. 36

Tube-based active crossovers. Theory, design and construction.
AUDIOXPRESS Sep 2003 (v.34#9) pg. 16

The ABCs of filters. Part 1. Electrical filter terminology, basic equations, and types.
AUDIOXPRESS Sep 2003 (v.34#9) pg. 38

The ABCs of filters. Part 2. How to control system response in sealed and vented enclosures.
AUDIOXPRESS Oct 2003 (v.34#10) pg. 50

How to design your own speakers. Explore the ins and outs of loudspeaker crossovers and learn how to design crossover networks to suit your specific needs.
ELECTRONICS HOBBYISTS HANDBOOK 1992 pg. 28

Circuit for an 1800-Hz crossover.
ELECTRONICS NOW Dec 1999 (v.70#12) pg. 26

A custom tube electronic crossover. An active crossover for a multi-amp system which combines several designs into a single custom-built system. Part 1. Enclosure and construction.
GLASS AUDIO 2/1993 (v.5#2) pg. 22

A custom tube electronic crossover. An active crossover for a multi-amp system which combines several designs into a single custom-built system. Part 2. Schematic and parts list.
GLASS AUDIO 3/1993 (v.5#3) pg. 22

Triode minimalist crossover. A simple, affordable tube crossover that retains the purity of a single-ended design.
GLASS AUDIO 6/1996 (v.8#6) pg. 22
Correction GLASS AUDIO 2/1997 (v.9#2) pg. 56
Added Info GLASS AUDIO 1/1998 (v.10#1) pg. 59

Electronic crossover circuit and an optional power-amplifier setup for a complete biamp project.
HANDS-ON ELECTRONICS Summer 1984 (v.2#1) pg. 77

XM1 electronic crossover network for improved loudspeaker performance. Est. cost: $18.
HANDS-ON ELECTRONICS Nov 1987 (v.4#11) pg. 59
Correction HANDS-ON ELECTRONICS Jan 1988 (v.5#1) pg. 14

Electronic crossover networks for hi-fi. What they are, how they work and how you can design your own.
POPULAR ELECTRONICS [1] Aug 1975 (v.8#2) pg. 33

A 3-way drive system for speakers. Active crossover divides the audio spectrum for the individual drivers before power amplification.
POPULAR ELECTRONICS [1] Apr 1980 (v.17#4) pg. 46
Correction POPULAR ELECTRONICS [1] May 1980 (v.17#5) pg. 7

Cancel rumble with this bass-summing amplifier. May also be used an as an electronic crossover for a subwoofer power amplifier.
POPULAR ELECTRONICS [1] Apr 1981 (v.19#4) pg. 77

How to design your own speakers. Why crossovers are used and how you can design one to suit your specific needs.
POPULAR ELECTRONICS [2] Mar 1991 (v.8#3) pg. 34
Correction POPULAR ELECTRONICS [2] Jun 1991 (v.8#6) pg. 3

Build a speaker protector circuit to prevent damage from overdrive, amplifier failure and switching thumps.
POPULAR ELECTRONICS [2] Mar 1992 (v.9#3) pg. 41
Correction POPULAR ELECTRONICS [2] Jun 1992 (v.9#6) pg. 3

Designing loudspeaker crossovers is easier with the help of these computer programs written in BASIC.
POPULAR ELECTRONICS [2] Jul 1995 (v.12#7) pg. 37
Correction POPULAR ELECTRONICS [2] Dec 1995 (v.12#12) pg. 4

How to determine the values for components in a two-way crossover network.
RADIO-ELECTRONICS Jul 1987 (v.58#7) pg. 7

Troubleshooting crossover problems in the KEF loudspeaker system.
SPEAKER BUILDER 3/1981 [Aug 1981] (v.2#3) pg. 41
Added Info SPEAKER BUILDER 1/1982 [Feb 1982] (v.3#1) pg. 42

Simple crossover test box lets you investigate the effects of series padding of the tweeter by varying the resistor and capacitor values.
SPEAKER BUILDER 1/1982 [Feb 1982] (v.3#1) pg. 30

Passive crossover networking. Information on using the hybrid Butterworth crossover design for multi-driver systems.
SPEAKER BUILDER 1/1982 [Feb 1982] (v.3#1) pg. 32

Simple circuit boards for crossovers and dummy loads can by made using just a sharp knife to cut away unwanted copper.
SPEAKER BUILDER 1/1982 [Feb 1982] (v.3#1) pg. 34

Phase coherent crossover networks. The design of crossover networks which have minimum phase distortion.
SPEAKER BUILDER 2/1982 [May 1982] (v.3#2) pg. 12
Added Info SPEAKER BUILDER 2/1983 [Aug 1983] (v.4#2) pg. 26
Added Info SPEAKER BUILDER 1/1984 [Mar 1984] (v.5#1) pg. 40

Loudspeaker networks. An examination of aspects of networks (crossovers) recommended for use with multi-unit loudspeaker systems.
SPEAKER BUILDER 2/1982 [May 1982] (v.3#2) pg. 18

The merits of series and parallel networks.
SPEAKER BUILDER 3/1982 [Oct 1982] (v.3#3) pg. 12

An active crossover with phase correctors. Permits fine-tuning of system phase alignment from preamp to driver output. Part 1. Overall view of the principles behind the crossover.
SPEAKER BUILDER 3/1982 [Oct 1982] (v.3#3) pg. 14
Correction SPEAKER BUILDER 1/1983 [Jun 1983] (v.4#1) pg. 41
Added Info SPEAKER BUILDER 2/1983 [Aug 1983] (v.4#2) pg. 33
Correction SPEAKER BUILDER 2/1983 [Aug 1983] (v.4#2) pg. 34
Added Info SPEAKER BUILDER 4/1983 [Dec 1983] (v.4#4) pg. 34
Added Info SPEAKER BUILDER 4/1984 [Dec 1984] (v.5#4) pg. 38
Added Info SPEAKER BUILDER 2/1986 [May 1986] (v.7#2) pg. 56
Added Info SPEAKER BUILDER 1/1987 [Jan 1987] (v.8#1) pg. 49

Custom wound inductors for loudspeaker crossovers.
SPEAKER BUILDER 3/1982 [Oct 1982] (v.3#3) pg. 20
Added Info SPEAKER BUILDER 1/1983 [Jun 1983] (v.4#1) pg. 41, 43
Added Info SPEAKER BUILDER 4/1983 [Dec 1983] (v.4#4) pg. 39
Added Info SPEAKER BUILDER 3/1986 [Aug 1986] (v.7#3) pg. 52
Added Info SPEAKER BUILDER 4/1987 [Dec 1987] (v.8#4) pg. 47
Added Info SPEAKER BUILDER 5/1988 [Sep 1988] (v.9#5) pg. 73

Electronic crossovers revisited. Improvement to crossover circuits is achieved by substituting the National LF351 IC or the TI TL071 IC for the old 741 IC. Several filter circuits shown.
SPEAKER BUILDER 3/1982 [Oct 1982] (v.3#3) pg. 22

An active crossover with phase correctors. Part 2. How to measure phase angles among your drivers and how to use the crossover to align your system.
SPEAKER BUILDER 4/1982 [Feb 1983] (v.3#4) pg. 26

Computer programs for Thiele-Small computations. (1) Calculate component values for passive two-way crossovers. (2) Calculate the db output of a T/S alignment at selected frequencies. Written in BASIC.
SPEAKER BUILDER 4/1982 [Feb 1983] (v.3#4) pg. 33

Impedance compensating crossover.
SPEAKER BUILDER 1/1983 [Jun 1983] (v.4#1) pg. 11

Converting a typical iron-core choke into an air-core coil for crossovers.
SPEAKER BUILDER 1/1984 [Mar 1984] (v.5#1) pg. 34

Advice on crossover networks for a pair of SMGs and a Polk LF14 subwoofer.
SPEAKER BUILDER 1/1984 [Mar 1984] (v.5#1) pg. 39

Proper baffling and a crossover circuit for use with the Strathearn SLC2 midrange/high-frequency ribbon drivers. Includes tips on building an arched "wing" on each side of the driver.
SPEAKER BUILDER 2/1984 [Jun 1984] (v.5#2) pg. 30
Correction SPEAKER BUILDER 4/1984 [Dec 1984] (v.5#4) pg. 38

Accurate acoustic measurement of a crossover network requires looking at the difference between filtered and unfiltered responses.
SPEAKER BUILDER 4/1984 [Dec 1984] (v.5#4) pg. 28

Passive crossover networks. Part 1. Two-way networks. Includes BASIC computer programs to calculate component values.
SPEAKER BUILDER 1/1985 [Feb 1985] (v.6#1) pg. 13
Correction SPEAKER BUILDER 2/1985 [May 1985] (v.6#2) pg. 46
Added Info SPEAKER BUILDER 3/1985 [Aug 1985] (v.6#3) pg. 45, 47, 48
Added Info SPEAKER BUILDER 4/1985 [Nov 1985] (v.6#4) pg. 48
Correction SPEAKER BUILDER 4/1985 [Nov 1985] (v.6#4) pg. 52
Added Info SPEAKER BUILDER 1/1986 [Apr 1986] (v.7#1) pg. 46
Added Info SPEAKER BUILDER 1/1988 [Jan 1988] (v.9#1) pg. 53
Added Info SPEAKER BUILDER 4/1988 [Jul 1988] (v.9#4) pg. 63
Added Info SPEAKER BUILDER 6/1988 [Nov 1988] (v.9#6) pg. 69

Microcomputer-aided driver attenuation. Computer program (written in BASIC) aids in the design of loudspeaker crossover attenuators.
SPEAKER BUILDER 1/1985 [Feb 1985] (v.6#1) pg. 24
Added Info SPEAKER BUILDER 2/1991 [Apr 1991] (v.12#2) pg. 52

Report on assembling and using the MKIVF electronic crossover kit from Shadow Engineering.
SPEAKER BUILDER 1/1985 [Feb 1985] (v.6#1) pg. 36

Passive crossover networks. Part 2. Three-way systems.
SPEAKER BUILDER 2/1985 [May 1985] (v.6#2) pg. 26
Correction SPEAKER BUILDER 3/1985 [Aug 1985] (v.6#3) pg. 45
Added Info SPEAKER BUILDER 3/1985 [Aug 1985] (v.6#3) pg. 45
Added Info SPEAKER BUILDER 1/1988 [Jan 1988] (v.9#1) pg. 53

Passive crossover networks. Part 3. How to actively implement two-way networks.
SPEAKER BUILDER 3/1985 [Aug 1985] (v.6#3) pg. 14
Added Info SPEAKER BUILDER 2/1987 [May 1987] (v.8#2) pg. 61
Added Info SPEAKER BUILDER 5/1988 [Sep 1988] (v.9#5) pg. 58
Added Info SPEAKER BUILDER 1/1991 [Feb 1991] (v.12#1) pg. 92
Added Info SPEAKER BUILDER 2/1991 [Apr 1991] (v.12#2) pg. 62
Added Info SPEAKER BUILDER 2/1997 [Mar 1997] (v.18#2) pg. 42

Electronic crossovers revisited. Updating crossover circuits which originally appeared in "Audio Amateur" magazine. National LF351 or Texas Instrument TL071 ICs are substituted for the 741 IC.
SPEAKER BUILDER 3/1985 [Aug 1985] (v.6#3) pg. 20

Using a voltmeter to check the operation of a crossover with drivers connected. Two methods shown.
SPEAKER BUILDER 3/1985 [Aug 1985] (v.6#3) pg. 44

A low-resonance loudspeaker. A new technology for construction of loudspeaker enclosures and crossovers that eliminates or greatly reduces resonance problems.
SPEAKER BUILDER 4/1985 [Nov 1985] (v.6#4) pg. 18
Added Info SPEAKER BUILDER 4/1987 [Dec 1987] (v.8#4) pg. 35
Added Info SPEAKER BUILDER 1/1989 [Jan 1989] (v.10#1) pg. 55

Passive crossover networks. Part 4. How to design active three-way all-pass and constant-power crossover networks.
SPEAKER BUILDER 1/1986 [Apr 1986] (v.7#1) pg. 20

Tips on assembling crossovers by using tempered hardboard, silicone glue and eyelets (grommets).
SPEAKER BUILDER 1/1986 [Apr 1986] (v.7#1) pg. 37

How to measure the inductance of open-air and ferrite-core coils (chokes) for use in crossovers.
SPEAKER BUILDER 1/1986 [Apr 1986] (v.7#1) pg. 57

Tip on orienting multiple inductors on a crossover board.
SPEAKER BUILDER 2/1986 [May 1986] (v.7#2) pg. 41

Tip on using a glue gun to secure components to crossover boards.
SPEAKER BUILDER 2/1986 [May 1986] (v.7#2) pg. 41

Crossover component capabilities and requirements. Part 1. Current limit testing and power division.
SPEAKER BUILDER 3/1986 [Aug 1986] (v.7#3) pg. 14
Added Info SPEAKER BUILDER 3/1990 [Jun 1990] (v.11#3) pg. 77

Upgrading Speakerlab's S-6 crossover.
SPEAKER BUILDER 3/1986 [Aug 1986] (v.7#3) pg. 22

Crossover component capabilities and requirements. Part 2. Crossover voltage and current factors.
SPEAKER BUILDER 4/1986 [Oct 1986] (v.7#4) pg. 32

Tips on building a complete speaker system around the Strathearn driver. Includes schematic for a passive crossover.
SPEAKER BUILDER 4/1986 [Oct 1986] (v.7#4) pg. 41

In praise of active crossovers. Advantages of active (electronic) crossover networks are detailed.
SPEAKER BUILDER 4/1986 [Oct 1986] (v.7#4) pg. 52
Added Info SPEAKER BUILDER 2/1987 [May 1987] (v.8#2) pg. 58
Added Info SPEAKER BUILDER 4/1987 [Dec 1987] (v.8#4) pg. 56
Added Info SPEAKER BUILDER 4/1988 [Jul 1988] (v.9#4) pg. 57
Added Info SPEAKER BUILDER 6/1988 [Nov 1988] (v.9#6) pg. 69

Report on the Audio Control "Richter Scale", a combination of a two-way electronic crossover with a low-frequency equalizer and test system. Includes tips on installation and setup.
SPEAKER BUILDER 2/1987 [May 1987] (v.8#2) pg. 50
Added Info SPEAKER BUILDER 3/1987 [Aug 1987] (v.8#3) pg. 61

Difficulties in equalizing tweeter drivers equipped with Ferrofluid.
SPEAKER BUILDER 2/1987 [May 1987] (v.8#2) pg. 61

Is driver impedance compensation worthwhile? How to test your loudspeakers and crossover to determine the effect of impedance compensation.
SPEAKER BUILDER 3/1987 [Aug 1987] (v.8#3) pg. 31
Correction SPEAKER BUILDER 4/1987 [Dec 1987] (v.8#4) pg. 50

Passive crossover networks. Part 5. Alternate bandpass circuits.
SPEAKER BUILDER 4/1987 [Dec 1987] (v.8#4) pg. 9

Fast and easy active filter calculations for electronic filters and crossovers. Includes a computer program to calculate values for Sallen & Key filters.
SPEAKER BUILDER 4/1987 [Dec 1987] (v.8#4) pg. 15

Loudspeaker tune up. Tips on wiring, crossover, speaker stand, etc.
SPEAKER BUILDER 2/1988 [Apr 1988] (v.9#2) pg. 29

Minimum phase crossovers. Three useful minimum phase crossover approaches that are worth considering.
SPEAKER BUILDER 3/1988 [May 1988] (v.9#3) pg. 34

Active filter design with crossover calc. Description of an available BASIC computer program to aid in the design of active filters.
SPEAKER BUILDER 4/1988 [Jul 1988] (v.9#4) pg. 34

Report on the Marchand Electronic Crossover kit (model XM1).
SPEAKER BUILDER 5/1988 [Sep 1988] (v.9#5) pg. 46

Odd-order Bessel filters are compared with odd-order Butterworth filters.
SPEAKER BUILDER 5/1988 [Sep 1988] (v.9#5) pg. 61

Technique to measure inductance (and approximate Q) of chokes used in passive crossovers. Includes a simple BASIC program to perform the needed computations.
SPEAKER BUILDER 6/1988 [Nov 1988] (v.9#6) pg. 43

Upgrading JBL L-100 speakers by installing a new crossover. The crossover was designed using the computer program which is evaluated in the same article.
SPEAKER BUILDER 1/1989 [Jan 1989] (v.10#1) pg. 42
Added Info SPEAKER BUILDER 5/1989 [Sep 1989] (v.10#5) pg. 64

Designing a crossover with a response goal of compensating the response step at 30-degrees off axis. Some tips.
SPEAKER BUILDER 1/1989 [Jan 1989] (v.10#1) pg. 55

An easy IC power amp/crossover is used to add a subwoofer to a low-power stereo or to a video system.
SPEAKER BUILDER 2/1989 [Mar 1989] (v.10#2) pg. 33

Tweeter Q problems. An examination of low-frequency resonance of tweeters and the effect on midrange. Includes a simple procedure to modify your third-order high-pass crossover to simulate the Acoustic Butterworth (AB) crossover.
SPEAKER BUILDER 5/1989 [Sep 1989] (v.10#5) pg. 40
Added Info SPEAKER BUILDER 1/1990 [Feb 1990] (v.11#1) pg. 61

Symmetrical speaker system with dual transmission lines. Part 2. (1) Electronic crossover design. (2) Adjustments and listening tests.
SPEAKER BUILDER 6/1989 [Nov 1989] (v.10#6) pg. 32

An acceleration feedback system. Two ways to improve the problematic low-frequency (woofer) response of dynamic speaker systems. This unique DIY article also includes notes, ideas, formulas and considerations.
SPEAKER BUILDER 1/1990 [Feb 1990] (v.11#1) pg. 10
Correction SPEAKER BUILDER 1/1991 [Feb 1991] (v.12#1) pg. 81
Added Info SPEAKER BUILDER 1/1991 [Feb 1991] (v.12#1) pg. 82
Added Info SPEAKER BUILDER 3/1991 [Jun 1991] (v.12#3) pg. 74
Added Info SPEAKER BUILDER 4/1991 [Aug 1991] (v.12#4) pg. 89
Added Info SPEAKER BUILDER 2/1992 [Apr 1992] (v.13#2) pg. 68

Minimus-7 super mod. Combine a pair of these inexpensive Radio Shack speakers into a D'Appolito configuration with an improved crossover design.
SPEAKER BUILDER 1/1990 [Feb 1990] (v.11#1) pg. 42
Correction SPEAKER BUILDER 3/1990 [Jun 1990] (v.11#3) pg. 3

Cause and cure for an out-of-phase tweeter and woofer mounted on a common baffle.
SPEAKER BUILDER 2/1990 [Apr 1990] (v.11#2) pg. 4

Crossovers for the novice. A proven approach to design and construct an effective passive crossover without the aid of computer software. Includes a glossary of crossover terminology.
SPEAKER BUILDER 5/1990 [Sep 1990] (v.11#5) pg. 26
Added Info SPEAKER BUILDER 8/1996 [Dec 1996] (v.17#8) pg. 51

Magnetic crosstalk in passive crossovers. Bi-wiring modification options for existing speakers to improve performance.
SPEAKER BUILDER 5/1990 [Sep 1990] (v.11#5) pg. 64

Tips on designing a sixth-order bandpass woofer.
SPEAKER BUILDER 6/1990 [Nov 1990] (v.11#6) pg. 74

An in-phase second-order Linkwitz-Riley configuration crossover for the Swan IV speaker system.
SPEAKER BUILDER 1/1991 [Feb 1991] (v.12#1) pg. 34
Correction SPEAKER BUILDER 2/1991 [Apr 1991] (v.12#2) pg. 84
Added Info SPEAKER BUILDER 6/1992 [Dec 1992] (v.13#6) pg. 46

Tips on assembling crossovers on blank circuit board with copper clad on one side only to eliminate the need for etching.
SPEAKER BUILDER 1/1991 [Feb 1991] (v.12#1) pg. 74

A simple passive two-piece two-way crossover network that can be daisy-chained to form three- and four-way dividing networks.
SPEAKER BUILDER 3/1991 [Jun 1991] (v.12#3) pg. 68
Added Info SPEAKER BUILDER 1/1992 [Jan 1992] (v.13#1) pg. 62
Added Info SPEAKER BUILDER 3/1992 [May 1992] (v.13#3) pg. 64
Added Info SPEAKER BUILDER 5/1992 [Sep 1992] (v.13#5) pg. 57
Correction SPEAKER BUILDER 1/1993 [Jan 1993] (v.14#1) pg. 68

Modifications for the Butterworth third-order, two-way divider network.
SPEAKER BUILDER 4/1991 [Aug 1991] (v.12#4) pg. 48

Quasi-electronic crossover. Simple, inexpensive, purist crossover that allows tube preamp through power amp signal flow and single channel or stereo subwoofing.
SPEAKER BUILDER 5/1991 [Oct 1991] (v.12#5) pg. 18

Real-world two-way crossovers. Step-by-step method for designing two-way crossovers with flat frequency response and good lobing behavior.
SPEAKER BUILDER 2/1992 [Apr 1992] (v.13#2) pg. 18
Added Info SPEAKER BUILDER 4/1992 [Jul 1992] (v.13#4) pg. 72

Capacitors for passive crossovers. A comprehensive look at their selection and use.
SPEAKER BUILDER 3/1992 [May 1992] (v.13#3) pg. 34

Circuit for a Linkwitz-Riley fourth-order crossover and the delay for one channel.
SPEAKER BUILDER 3/1992 [May 1992] (v.13#3) pg. 71

Modified Marchand X 1835 electronic crossover circuit for use with the Electro-Voice Patrician loudspeaker system (circa 1982).
SPEAKER BUILDER 3/1992 [May 1992] (v.13#3) pg. 72

Crossover construction tips with an emphasis on the physical assembly to provide good support of components, long life, non-interference, etc.
SPEAKER BUILDER 4/1992 [Jul 1992] (v.13#4) pg. 56

Real-world three-way crossovers. Description of a computer program that will enable you to choose the right Q for your system.
SPEAKER BUILDER 6/1993 [Dec 1993] (v.14#6) pg. 30

Modular active (electronic) crossovers. Includes all the calculations and schematics for building a crossover with a cutoff frequency of 2kHz for two-way and three-way loudspeakers.
SPEAKER BUILDER 1/1994 [Jan 1994] (v.15#1) pg. 20
Correction SPEAKER BUILDER 2/1994 [Mar 1994] (v.15#2) pg. 62
Added Info SPEAKER BUILDER 3/1994 [Apr 1994] (v.15#3) pg. 39 (BUF 124 analysis)
Added Info SPEAKER BUILDER 4/1994 [May 1994] (v.15#4) pg. 48
Added Info SPEAKER BUILDER 6/1994 [Aug 1994] (v.15#6) pg. 58
Correction SPEAKER BUILDER 7/1994 [Oct 1994] (v.15#7) pg. 56
Added Info SPEAKER BUILDER 7/1995 [Oct 1995] (v.16#7) pg. 48
Correction SPEAKER BUILDER 1/1996 [Feb 1996] (v.17#1) pg. 57

Reasons why a third-order two-way crossover network may not satisfy the component ratio conditions of a Butterworth filter.
SPEAKER BUILDER 3/1994 [Apr 1994] (v.15#3) pg. 63

Time response of crossover filters. Using the combined response of crossover filters (vs. SPL-frequency response) when designing and analyzing crossover networks.
SPEAKER BUILDER 4/1994 [May 1994] (v.15#4) pg. 10

Inductor coil crosstalk. Experiment investigates mutual inductance coupling as it affects inductor coils in passive crossover networks.
SPEAKER BUILDER 7/1994 [Oct 1994] (v.15#7) pg. 14
Added Info SPEAKER BUILDER 3/1995 [Apr 1995] (v.16#3) pg. 65

Tips on modifying a single-channel subwoofer amplifier to lower the crossover frequency.
SPEAKER BUILDER 7/1994 [Oct 1994] (v.15#7) pg. 48

Determining the best value to use for the resistance R in crossover design formulas.
SPEAKER BUILDER 7/1994 [Oct 1994] (v.15#7) pg. 49

Tips on crossover design. Looks at polarity reversal, quasi-second-order filters, and large MTM-type designs with multiple drivers.
SPEAKER BUILDER 7/1994 [Oct 1994] (v.15#7) pg. 52

How to mathematically derive corner frequencies for various orders of rolloff when the -3dB or -6dB down point is known.
SPEAKER BUILDER 7/1994 [Oct 1994] (v.15#7) pg. 53

Driver-offset-related phase shifts in crossover design. Extensive study includes several different filter types and demonstrates the influence of phase shift on crossover behavior. Part 1.
SPEAKER BUILDER 1/1995 [Jan 1995] (v.16#1) pg. 26
Added Info SPEAKER BUILDER 1/1996 [Feb 1996] (v.17#1) pg. 55

The Baekgaard crossover technique is modified to produce constant-voltage results.
SPEAKER BUILDER 2/1995 [Mar 1995] (v.16#2) pg. 20
Added Info SPEAKER BUILDER 6/1995 [Sep 1995] (v.16#6) pg. 54
Added Info SPEAKER BUILDER 2/1996 [Apr 1996] (v.17#2) pg. 30

Driver-offset-related phase shifts in crossover design. Part 2.
SPEAKER BUILDER 2/1995 [Mar 1995] (v.16#2) pg. 26

Build an active crossover network.
SPEAKER BUILDER 1/1996 [Feb 1996] (v.17#1) pg. 20

The XVR-1 two-way electronic crossover platform is designed for home theaters or other applications requiring subwoofers. Est. cost: $269 (kit).
SPEAKER BUILDER 2/1996 [Apr 1996] (v.17#2) pg. 18
Added Info SPEAKER BUILDER 5/1996 [Aug 1996] (v.17#5) pg. 53
Added Info SPEAKER BUILDER 2/1997 [Mar 1997] (v.18#2) pg. 55

Block diagram of a first-, second- or third-order crossover for three-way loudspeaker.
SPEAKER BUILDER 2/1996 [Apr 1996] (v.17#2) pg. 53

Active and passive monophonic subwoofer crossovers are explained and compared.
SPEAKER BUILDER 2/1996 [Apr 1996] (v.17#2) pg. 55

Squatline. A particleboard enclosure is equipped with a Dayton 8" treated paper woofer, a Peerless 1" dome tweeter and two passive crossovers (a second-order line-level [Q=0.5] and an optional third-order highly damped overlapped line-level [Q=0.353]).
SPEAKER BUILDER 3/1996 [May 1996] (v.17#3) pg. 16

Capacitors. Why they matter. Outline of the differences among capacitor types and advice on choosing components for a loudspeaker crossover.
SPEAKER BUILDER 3/1996 [May 1996] (v.17#3) pg. 40

Choosing the best filter coils for passive crossover filters.
SPEAKER BUILDER 4/1996 [Jul 1996] (v.17#4) pg. 22

Quality issues in iron-core coils for a passive crossover network. How to measure coil distortion as well as conduct an effective listening test.
SPEAKER BUILDER 6/1996 [Oct 1996] (v.17#6) pg. 44
Added Info SPEAKER BUILDER 1/1997 [Feb 1997] (v.18#1) pg. 50

Inductors for passive crossover networks.
SPEAKER BUILDER 7/1996 [Nov 1996] (v.17#7) pg. 36
Added Info SPEAKER BUILDER 6/1997 [Sep 1997] (v.18#6) pg. 61

Third-order crossover circuit for VMPS subwoofer.
SPEAKER BUILDER 1/1997 [Feb 1997] (v.18#1) pg. 54

Crossover filter suggestions for use with the Radio Shack Optimus Pro LX4 loudspeakers.
SPEAKER BUILDER 2/1997 [Mar 1997] (v.18#2) pg. 45

The phase redeemer. How to significantly reduce phase distortion in crossover networks with a phase-equalization circuit.
SPEAKER BUILDER 5/1997 [Aug 1997] (v.18#5) pg. 34
Added Info SPEAKER BUILDER 3/1998 [May 1998] (v.19#3) pg. 58

Crossovers and resistors. Using resistors for signal attenuation in crossover designs.
SPEAKER BUILDER 6/1997 [Sep 1997] (v.18#6) pg. 36

Design concepts regarding the phase relationships in acoustic Linkwitz-Riley (L-R) crossovers.
SPEAKER BUILDER 6/1997 [Sep 1997] (v.18#6) pg. 60

Filters: Plain and simple. A review of analog filters, the most common filter type used in audio design. Includes practical circuits for biamp and triamp crossovers for a high-quality audio system.
SPEAKER BUILDER 7/1997 [Nov 1997] (v.18#7) pg. 14

Minimum phase, high-order filtering. Driver-selection tips and several high-order filters that make minimum phase practical.
SPEAKER BUILDER 4/1998 [Jul 1998] (v.19#4) pg. 16

Seismic stack system. Building and driving home-theater speakers which utilize active crossover topology.
SPEAKER BUILDER 5/1998 [Aug 1998] (v.19#5) pg. 18

Computer modeling for designing passive crossovers takes the tedium and drudgery out of this time-intensive process.
SPEAKER BUILDER 8/1998 [Jan 1999] (v.19#8) pg. 20
Added Info SPEAKER BUILDER 2/1999 [Apr 1999] (v.20#2) pg. 63

Afterburner for aftershock. Build an active crossover for a single-channel amplifier that will sum a Pro Logic receiver's left and right channels. This board is packaged into an old Quatre stereo amplifier with one burned-out channel.
SPEAKER BUILDER 3/1999 [May 1999] (v.20#3) pg. 26
Correction SPEAKER BUILDER 4/1999 [Jul 1999] (v.20#4) pg. 50
Correction SPEAKER BUILDER 6/1999 [Sep 1999] (v.20#6) pg. 60

External mounting of loudspeaker crossovers will facilitate adjustment, modification and measurement.
SPEAKER BUILDER 6/1999 [Sep 1999] (v.20#6) pg. 62

Acceleration feedback systems. Groundbreaking work in the area of distortion-canceling feedback in small speaker systems. A new approach to single-amped feedback systems.
SPEAKER BUILDER 7/1999 [Nov 1999] (v.20#7) pg. 28

Mating subwoofers and satellite speakers via passive crossovers. How a passive crossover affects bass directivity.
SPEAKER BUILDER 8/1999 [Dec 1999] (v.20#8) pg. 38

Construction and use of a breadboard for passive crossovers which lets you quickly and easily test circuit configurations.
SPEAKER BUILDER 1/2000 [Feb 2000] (v.21#1) pg. 40

Crossover breadboard is built on a piece of shatter-resistant Lexan plastic.
SPEAKER BUILDER 3/2000 [May 2000] (v.21#3) pg. 54

Subwoofer active low-pass crossover. This design addresses the special problems associated with the subwoofers interaction with the woofers.
SPEAKER BUILDER 5/2000 [Aug 2000] (v.21#5) pg. 42

Series crossover networks. A brief introduction.
SPEAKER BUILDER 5/2000 [Aug 2000] (v.21#5) pg. 48
Added Info SPEAKER BUILDER 8/2000 [Dec 2000] (v.21#8) pg. 42
Added Info AUDIOXPRESS May 2001 (v.32#5) pg. 74
Added Info AUDIOXPRESS Aug 2001 (v.32#8) pg. 76
Added Info AUDIOXPRESS Mar 2002 (v.33#3) pg. 65

Piezo tweeter crossover requirements eyed.
SPEAKER BUILDER 7/2000 [Nov 2000] (v.21#7) pg. 49

The Actipass crossover system. Description of high-quality speakers featuring a unique crossover system.
SPEAKER BUILDER 8/2000 [Dec 2000] (v.21#8) pg. 14
Correction AUDIOXPRESS Mar 2001 (v.32#3) pg. 77