U.S. Amps Bass Mekanik Owner's Manual And Installation Manual - page 7
VOLTS
RESISTANCE
CURRENT
VOLTS X CURRENT
WATTS
20 X
100
5
40 X
400
10
20 4
5
40 4
10
The equation is kind of divided into 2 parts. If you take the time to check this out, you will see what is
REALLY COOL about amplifier bridging, and why it is so important to pay attention to the numbers.
PART ONE:
WORKING MODEL:
You have a two-channel amplifier. Each channel that has 20 VOLT “power rails”.
You have a speaker with 4 OHMS of RESISTANCE.
If you hook ONE CHANNEL to the speaker and do the math:
”5” is AMPS OF CURRENT. (“AMPS” and “CURRENT” are another one of
those interchangeable words.) Next, we will use the answer of this
first part and the “rail voltage” to determine WATTS OF POWER.
PART TWO:
So, whaddya know? You’re putting out 100 WATTS! Well, that’s all fine and dandy until you BRIDGE your
amp. There is hidden mathmatical advantage in doing so, and the only thing that can hold you back are
THE LAWS OF PHYSICS. Each channel of your amp has a positive and negative “rail voltage”. Engineers
speak of “power rails” when they refer to amplifier voltage, hence the name. Your 20 VOLT amp REALLY
has a POSITIVE 20 VOLTS and a NEGATIVE 20 VOLTS, but you are only using HALF of it for each
channel. So, you break bad with the built-in bridging capability of your U.S. Amp, and all of a sudden you
have a single 40 VOLT BRIDGED CHANNEL.
Yes, Pilgrim, you are now cooking with gas. The only thing holding you up is real life. The V divided by R
equals A thing fails to take into account the physical limitations of friction and loss, let alone the mechanical
limitations of components and design. These are considerable factors. Luckily for you, U.S. Amps
overcompensates from this standpoint, and delivers TRUE RATED 2 ohm per channel performance. Most
amplifiers are not built with the intestinal fortitude necessary to double PER CHANNEL power from 4 to 2
ohms, which as you see, QUADRUPLES your
Bridged output. Don’t worry- U.S. Amps has you covered.
SO, LETS’ SUBSTITUTE 40 VOLTS FOR 20 AND DO THE MATH:
AND HOW MANY WATTS IS THAT?
7