This manual is written for the experienced installer.
If you are unfamiliar with the terminology and concepts within, we strongly recommend
you seek the assistance of an Authorized U.S. Amps Dealer or other car audio professional.
Authorized Dealers can be located on the U.S. Amps website:
, or by
calling the factory Monday-Friday at (352)-338-1926, 9am to 5pm EST.
Please read it in it’s entirety before
installation.
www.usamps.com
Did you buy the right U.S. Amp?
Amplifier Nomenclature:
There is a U.S. Amp for every purpose. If your needs require maximum amplifier power into 4 or 2
ohms per channel, or 4 ohms bridged, use one of the Xterminator “X” models for the best results.
If you have more than a pair of speakers, or if the speakers have multiple voice coils, you may need
the extra current and low impedance stability of the USA Series. The USA Series develops maximum
output when used at 1 ohm per channel or 2 ohms bridged.
If you participate in sound-off events, the “HC” and “VLX” amplifiers are designed to operate at ultra-
low impedances. U.S. Amps has an established track record of success in SPL and sound quality
competition.
With the exception of the Xterminators, The amplifier model numbers indicate the total power of
when rated at 4 ohms.
The Xterminator models are based on the USA Series, but have a higher 4 ohm per channel
power rating. The “X” model nomenclature indicates the power
into 4 ohms.
all
channels combined
per channel
Did you buy the right U.S. Amp?
Amplifier Nomenclature:
Thank-you for choosing U.S. Amps! You have purchased the finest product of its type available.
Each U.S. Amp is built
in our Gainesville Florida factory. Nothing is done "off shore" or
across the border. You won't just
to your U.S. Amp, you will
it.
When properly installed, this unit will provide years of trouble-free service..
Remember,
, and enjoy your U.S. Amp!
by hand
listen
experience
protect your hearing
Thank-you for choosing U.S. Amps! You have purchased the finest product of its type available.
Each U.S. Amp is built
in our Gainesville Florida factory. Nothing is done "off shore" or
across the border. You won't just
to your U.S. Amp, you will
it.
When properly installed, this unit will provide years of trouble-free service..
Remember,
, and enjoy your U.S. Amp!
by hand
listen
experience
protect your hearing
2
Contents
Installation
3
USA-50HC, USA-150,150x, USA-300, 300x
13
Active Electronic Crossovers
4
USA-5500x
15
Amplifier Power and Fuse
6
USA-400, 400x, VLX-25, USA-100HC
17
Getting Wired
7
Factory Service
18
Batteries
7
Limited Warranty
18
Energy Management
9
Never, Never Land
19
Amplifier Specifications
10
Other Cool Stuff
19
USA-50, USA-100
11
Contents
