US Amps AX 用户手册

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Always start with the gain control fully counter-clockwise 

(all the way down), or just slightly open. Adjust the source unit volume as high as possible without 
distortion. Increase the amplifier gain until the amplifier distorts, then turn the gain down slightly 
until the signal becomes clear. It is desirable to operate the amp at the lowest possible gain setting 
to help reject spurious system noise.

This product will accept line and signal level, and can be 

used with most BTL "high powered" sources. To use a BTL source, observe the following:

1) BTL outputs have two "hot" non-grounded leads per channel. Select ONE per channel, and 

connect it to the “center conductor” of the RCA input cables going to the amplifier input.

2) Insulate and disregard the second wire of each BTL output pair.
3) Ground the shield wires of the RCA cable to the metal body of the source unit.

U.S.Amps feature a unique isolated input section that will accept 

signal voltages from 1 to 9 volts. The input section also provides amplifier ground isolation for the 
prevention of system and engine noise. The unique configuration of the U.S.Amps input necessi-
tates a correct input ground, and is not compatible with external ground isolation devices.

Ventilation: 

It is important to provide the amplifier with adequate ventilation to remove 

heat from the amplifier heat sink. During high performance applications, in which the amplifier 
may be exposed to extremely low impedance loads, it may be necessary to provide external 
ventilation via a fan or some other means. With proper ventilation, the "run time" of the amplifier 
between thermal protection cycles can be greatly extended.

Amplifier Mounting:

 

Choose an appropriate location to mount the amplifier(s). Make 

sure your choice is free from excess heat, moisture, and vibration. Under the vehicle seat or in the 
trunk are common mounting locations. Be sure the amplifier receives adequate ventilation to its 
heat sink and is positioned away from flying luggage and people’s feet. Do not mount to the 
speaker enclosures.

IMPORTANT NOTICE

The Input of a U.S.Amp MUST be GROUNDED for proper amplifier operation.

The use of external ground isolation dividing devices is UNNECESSARY

 and may cause severe amplifier and/or system damage.

There is a U.S.Amp for every purpose! From raw power to exquisite sound quality and everything 

in between, U.S.Amps offers state-of-the-art technology to meet your every need.