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Additional Technical Installation Notes
When connecting the DX7 to an amplifier or mixer, a
maximum unbalanced cable length of 20 feet will
reduce susceptibility to hum, noise, and high frequency
losses; if a longer cable is needed, utilize a "direct box"
which uses a transformer or amplifiers to convert the
output to a balanced line, and then run 2- conductor
shielded cable with XLR-3 or 1/4" Tip/Ring/Sleeve
phone plugs to a balanced input on the mixer or ampli-
fier.
If the cable length is under 20 feet, but the mixer or
amplifier input requires an XLR connector, a direct box
may not be necessary; a simple adaptor cable will often
do the job, so long as complex grounding problems
don't cause excessive hum. To adapt the phone jack
OUTPUT of the DX7 to an XLR input, first check the
manual on the other equipment to see which pin of its
XLR is the "hot" or "signal" pin. In Yamaha equipment,
pin 2 is "hot." Cut the phone plug off one end of a stand-
ard guitar-type cable, and connect the center conductor
to XLR's "hot" pin. Then wire the shield to the other two
pins of the XLR; if hum is a problem, cut the shield
connection to pin 1 of the XLR.
The nominal output level is -20 dBm (77.5 mV),
although the actual level depends on the voice, the
VOLUME setting, and how many notes are being played
at once. The OUTPUT jack will drive low impedance
(600 ohm) or higher impedance inputs. Maximum out-
put may be considerably higher; since power amplifiers'
nominal input levels are those levels that drive the
amplifier to maximum power, an amplifier rated at 0
dBm or +4 dBm input level may be well matched to
the DX7 output. Mixers with adjustable input sensitivity
may have to be set anywhere from -20 to +4 dBm
nominal, depending on the selected voice, the playing
style, and the DX7 VOLUME setting.
As is the case with any electric or electronic instru-
ment, the AC power receptacle should be checked for
correct voltage and polarity. To find out what to do about
operation with power mains that do not meet these
specifications, contact a Yamaha dealer or authorized
Yamaha DX service center.
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Phone-to-XLR adaptor cable.