U.S. Amps Bass Mekanik Owner's Manual And Installation Manual - page 23
T-Class™ amplifiers operate at a much
than most “Class D” designs, producing more power
into 8 and 4-ohm loads. Correspondingly, the T-Class™ output filter is much smaller than that used with
“Class D”, allowing U.S. Amps T-Class™ to operate into various loads without affecting signal quality or
frequency response in the audible range.
Typically, U.S. Amps' T-Class™ amplifiers have THD+N of less than 0.08% over the full audio bandwidth.
Additionally, U.S. Amps' T-Class™ exhibits ultra-low IHF-IM (high-frequency, inter-modulation) distortion -
less than 0.04%. Low IHF-IM reduces “listening fatigue”, even at excessive volume levels. By any
measure these superb specifications fall within the esoteric realm of audiophile performance.
Another amazing but predictable benefit of T-Class™ is its cool operating temperature. When used within
its designed power and load limitations, T-Class™ generates almost no heat. What little heat that is
produced is quickly absorbed by the standard-size U.S. Amps heat sink.
U.S. Amps T-Class™ is the beginning of an audio amplifier revolution. Soon the consumer will have
access to new and powerful products that will fit in confined spaces, require very little power to operate, and
produce incredible full-range digital fidelity.
Like any technology, DPP can be painted as great or terrible, depending on the facts examined, ignored, or
otherwise twisted in some marketing campaign. T-Class™ has a mediocre signal-to-noise ratio (86Db)
when compared to analog amplifiers; due to a certain amount of high frequency “noise” present in the
output content. This high-frequency “noise” is a signature of DPP technology, created by the terrific
switching speeds, and is well above the audible range.
The high frequency content of T-Class™ is extremely tiny, only about 200mv, and impacts harmlessly on
the speaker voice coils. By changing the output filter value it is possible to all but eliminate the switching
noise, but doing so would have a slightly detrimental effect on two T-Class™ benefits, the full-range digital
capability.
Like any other amplifier design, it is possible to distort, or “clip” the output of a Digital amplifier.
What few people understand is that any digital amplifier design, T-Class™ included, loses much of it's
efficiency benefits when it is used outside of it's intended operating range. When a digital amplifier
“clips” or is driven into gross distortion, it starts to act more like a conventional class “A-B” design, both
in power consumption and ugly waveforms.
A big reason that U.S. Amps' conventional class “A-B” amplifiers are successful in SPL competition
against “Class D” products is our firm commitment to power supply technology. Once you exceed the
“clean power” capability of any amplifier, it more or less lies down and lets the power supply do the
work. U.S. Amps power supplies out-work the rest. Our oversized power supplies only enhance the
capabilities of T-Class™ operation.
* “T-Class” is a Trademark of U.S. Amps Inc.
** “Digital Power Processing” is a Trademark of Tripath Technologies.
*** “Delco-Bose” is a Trademark of General Motors
higher voltage
U.S. Amps' T-Class™ provides power conversion efficiencies of 80% to more than 90%, equal to or better
than “Class D”.
The Limitations of Digital Audio Amplifiers:
T-CLASS EXPLAINED - PART 3
TM
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