Basically with 30 amps of fusing and 12.5 volts, the most power you can get out of that amp is 30 x 12.5 = 375 watts. Now before you get excited, class A amps are VERY inefficient and waste most of that power. To my knowledge, the efficiency on a class A is in the neighborhood of 45%. This equates to about 170 watts total combined power for all channels...

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smpl_gy running a smpl system...
one amp, one sub and 1.6 kilowatts of 50hz and below...