Wiring Headphones For Balanced Operation - Bryston BHA-1 Owner's Manual

12: FUSE LABEL & WARNINGS.
Follow all warnings and cautions.
13: REMOTE TRIGGER INPUT
When the power switch (item #9) is turned
off (down) the unit can still be powered on
by applying 12 volts DC at 50mA, across the
two TRIGGER INPUT pins. A two position
mating screw terminal connector (Bryston
part number CO-110A-11102) is included
with each unit. (see next page for hookup
details)
14: STEREO MINI-JACK INPUT
A 3.5mm 3 conductor gold plated phone
jack for connecting any audio analog audio
source like MP3 players, etc. Corresponds
to the "MINI" position of the input selector
switch (item #1).

WIRING HEADPHONES FOR BALANCED OPERATION

For headphones that have a separate pair of wires (+ and - phase) from each side, maximum perfor-
mance can be obtained by wiring these headphones for fully balanced operation where there is no
common or shared ground.
The BHA-1 provides two different connector options for balanced operation:
1) Using a single 4 pin XLR connector (e.g. Neutrik NC4MC-B), the left driver is connected as
follows: LEFT+
LEFT–
2) Using two 3 pin XLR plugs (e.g. Neutrik NC3MX-B) wire the two connectors as follows:
LEFT connector + pin 2
LEFT connector –
15: SINGLE ENDED INPUTS
16: BALANCED INPUTS
17: DATA PLATE LABEL
RIGHT+
pin 1
RIGHT–
pin 2
pin 3
One pair of RCA jacks, gold plated, for con-
necting line level analog audio inputs
3 pin female XLR jacks, gold plated, for
connecting balanced analog audio input
signals the BHA-1.
Pin 1 = ground
Pin 2 = positive phase
Pin 3 = negative phase
Lists the model name, electrical ratings, se-
rial number, manufacturing date code (yyww,
where the first two digits represent the two
least significant digits of the year, and the last
two digits represent the week of the year).
pin 3
pin 4
RIGHT connector +
RIGHT connector –
pin 2
pin 3