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This amplifier was marketed as the M1.0t for about $400.00. His 'motel-room' modified amplifier sound was so similar, Stereophile Magazine editors could not tell the difference between his amplifier and one costing more than $6,000. Bob Carver used 'distortion pots' to introduce amplifier characteristics, fine-tuned to null-out any sound differences. If sound was heard, the audio amps had different properties). If the amplifiers were 100% identical, no sound would be heard. Nevertheless, Carver, using null difference testing, (null difference testing consists of driving two different amplifiers with identical signal sources and exact levels, but out of phase by exactly 180 degrees. Of note that in both cases, the challenging amplifier could only be treated as a “black box” and could not even have its lid removed.
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