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5
WARNING: NEVER use ground-loop isolation
on the input of your U.S.Amp! It doesn’t need it!
AX-1000/2000
2-Channel Amplifiers
Controls and Features
Amplifier Input The amplifier MUST receive input on BOTH RCA jacks
for proper operation.
1
Amplifier Output
The low level output can be connected to other amplifiers.
2
Input Gain is variable from 1 to 9 volts for full output. Best results are achieved by
adjusting the control to the lowest setting in relation to the output of the source unit.
3
Low-pass Crossover Control
For the internal amplifier, adjustable from 50 Hz to 500 Hz @ 24dB.
4
Remote Bass Gain
A phone jack that accepts the included RBG control harness
to allow the amplifier volume to be controlled from the passenger compartment.
5
Low-pass Crossover On/Off Switch
A 2-way switch which enables/disables the low-pass crossover feature.
6
Subsonic Filter To optimize amplifier power in the audible frequencies, a defeatable
36 Hz subsonic filter provides a 6 dB per octave roll-off.
7
(Shown here is AX-1000, but the diagram is also applicable to AX-2000.)
INPUT
Gain
In
Out
Pwr Prot
SUB
Freq
SUB
XOver
Subsonic
Filter
Min 50
Off OnOff On
500
RBG
R
L
Two Ohm Stable Design
U.S.A.
A
X-
X-1
000
000
76
5
4
3
2
1