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Headphone contraption. Inserted between the power amplifier and the headphones. This circuit improves the bass by taking frequencies below 200 Hz from either channel and puts them at equal level in the opposite channel.
AUDIO AMATEUR 3/1975 [Jan 1976] (v.6#3) pg. 26

Build a "synthetic" crystal filter to plug into your headphone jack which does a better job than RC active filters in screening out nearby RF noise. Features two CW bandwidths, two phone bandwidths, and two notch filters.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1990 (v.46#4) pg. 18

Build the listening center. Simple project lets up to 7 users share a tape player or radio through headphones.
ELECTRONICS NOW Oct 1996 (v.67#10) pg. 53

Simple circuit for connecting one pair of headphones to two different amplifiers at the same time.
ELECTRONICS NOW Aug 1999 (v.70#8) pg. 5

A direct drive electrostatic headphone interface. This unit features dynamically linear circuitry, minimal signal processing, sonically inert power supply and carefully selected and applied passive components.
GLASS AUDIO 0/1988 (v.1) pg. 4
Added Info GLASS AUDIO 2/1989 (v.1#2) pg. 34

Build the listening center. Plug box provides a way to drive as many as seven pairs of Walkman-style headphones from a single signal source. Accommodates both mono and stereo input and output.
POPTRONIX EXPERIMENTER HANDBOOK Summer 1997 pg. 40

Output filters for SWB reception. Tips on selecting and using a filtering system between a SWL receiver and a good comfortable headset.
POPULAR COMMUNICATIONS Feb 1990 (v.8#6) pg. 39

Sound Partner. How to safely connect a second set of headphones to your portable personal-sound system.
POPULAR ELECTRONICS [2] Jul 1999 (v.16#7) pg. 43

Simple circuit for a modified blending of the left and right channels when using headphones to listen to music.
SPEAKER BUILDER 5/1988 [Sep 1988] (v.9#5) pg. 54

Supplemental volume control for aircraft headsets.
SPORT AVIATION May 1994 (v.43#5) pg. 102

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