Originally Posted by audio4life
The max power is limited to what can be driven into 2 channels? Does that mean what I think it means, that the multi channel amps can't make rated power to all channels at the same time?
Their description and specs:
A Word About Power Ratings
Music is, by its nature, dynamic. While it’s relatively common for the two main channels in a stereo amplifier to be asked to simultaneously deliver high
power levels, it is very uncommon for more than two channels to be called upon to deliver high power continuously at the same time, and this almost
never occurs outside of laboratory test conditions.
In order to deliver the most dynamic performance where it counts - with real music - we have designed the XPA Gen3 modular power amplifier with a
single immense power supply, which is able to deliver massive power continuously to any two channels, and to deliver huge amounts of power dynamically
to any number of channels when and if called upon to do so.
The power ratings for the XPA Gen3 modular power amplifier are the same with both channels driven continuously in the two-channel version of the amplifier,
and for ANY TWO CHANNELS DRIVEN CONTINUOUSLY in the versions of the XPA Gen3 configured with three, four, five, six, or even seven output channels.
In addition to this, because we always aim to provide the most complete information possible, we have also rated the other versions in terms of continuous power
(under laboratory conditions) with all channels driven.
Also note that, while the exceptional sound quality of the XPA Gen3 modular power amplifier, and its two-channel continuous power rating, remain the same
whether you choose to use a 120 VAC line or a 230 VAC line, the multi-channel power ratings are somewhat higher when you power the XPA Gen3 from a 230 VAC circuit.
While the XPA Gen3 modular power amplifier will provide plenty of power for most home theater installations when run from a 120 VAC line, for the absolute
best possible performance, we recommend operating the XPA Gen3 from a 230 VAC line.
A fully modular audio power amplifier with a high-efficiency switch mode power supply (SMPS), independent, fully discrete, dual differential, high current,
short signal path Class A/B amplifier modules, Optimized Class H™ power supply topology, and microprocessor-controlled fault protection.
ALL MODELS: Power Output Per Channel
300 watts RMS per channel; 20 Hz - 20 kHz; THD < 0.1%; into 8 Ohms
550 watts RMS per channel; 20 Hz - 20 kHz; THD < 0.2%; into 4 Ohms
800 watts RMS per channel; 20 Hz - 20 kHz; THD < 0.5%; into 2 Ohms
ALL MODELS: FTC Rated Power; 2 Channels Driven; 20 Hz - 20 kHz; THD <0.1%
300 watts RMS per channel; THD < 0.1%; into 8 Ohms (120 VAC line).
490 watts RMS per channel; THD < 0.1%; into 4 Ohms (120 VAC line).
Power Output Per Channel: All Channels Driven; THD <0.1% ; into 8 ohms
XPA two Gen3: 300 watts RMS per channel
XPA three Gen3: 275 watts RMS per channel
XPA four Gen3: 260 watts RMS per channel
XPA five Gen3: 250 watts RMS per channel
XPA six Gen3: 225 watts RMS per channel
XPA seven Gen3: 200 watts RMS per channel
To me.... while the type G power switching is more efficient and allows for using a slightly smaller power supply for driving multiple amp blades (esp 5 & 7) it is still governed the total available power, they simply chose a power supply that would give you 200 w/ch with 7 channels driven and anything over that for less channels driven is just gravy.