Crest Audio HD SERIES Manual page 22

The HD18 rear panel features external switches for the following:
XLR Pin+ Switch: This switch configures XLR input connection polarity. Either pin 2 or pin 3 may be
selected as the "hot" (+) pin. Amplifiers are shipped pin 2 "hot" (+) from the factory.
Gain Switch: This switch permits the amplifier to be configured for the standard input sensitivity (.775V
for rated power @ 8Ω), or for optional voltage gains of X40 or X20. Refer to the specifications for input
sensitivity values at optional voltage gains of X40 and X20.
NOTE: Two pairs of 5-way binding posts are provided for each channel, so that paralleling of speakers is
possible.
HD18 - Rear View
Appendix E
Appendix E
HD18 Power Amplifier - Special Functions
ALWAYS power down the amplifier before changing settings
with either the XLR Pin+ switch or the Gain switch!
Designed & manufactured in the USA by:
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
A
+
A B
A
A
+
+
A B
XLR Pin +
A
A B
B
2
A
+ B
B
XLR Pin (+) Switch
GAIN
Ø 40x 20x
dBu
A
3
B
1 2
3
Gain Switch
Crest Audio HD Series Power Amplifiers
Models HD2, HD4, HD6, HD9, HD12, HD18