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In Reply to: RE: Akai AA-R22/L Receiver question posted by Nadguy on July 29, 2014 at 11:45:17
Those sound plausible to me. They are measuring different circuits different ways.
Output power is typically rated 20-20k, and the fact that this is RMS at .05% THD says they didn't skimp on the power supply (no "peak music power" here!).
The aux/tape rating is for a line level circuit, much easier to make flat across a wide frequency range. (That 5 Hz low frequency rating tells me there are probably no capacitors in series with the signal, also a good sign.)
And the phono stage incorporates a RIAA equalization circuit that is actually pretty difficult to make *really* accurate unless you spend more than a typical mass market receiver can justify. Also, most vinyl LP's don't go much below 30 Hz (low frequencies cause large groove excursions that reduce playing time), and you actually want to roll off below 20 Hz (to reduce the effect of record warps). Above 15 KHz, rolling off is not necessaily a bad idea either - there's not much content in the grooves above 15 kHz, and inexpensive cartridges of the day could mistrack, so rolling off the ultrasonic garbage that resulted can help clean up the signal that gets sent to the power amp and speakers.
"Specsmanship" in the 1970's and 80's made for some absurd specs on some cheaply made equipment. But I'd say the numbers you quote are believable for a reasonably well engineered mass market piece of electronics.
Follow Ups:
Having been in audio at the time this receiver came out, I would agree that the phono section was intelligently engineered to get the best sound out of the tables it was likely to see. Even though I was very careful to match the resonance of the arm to the compliance of the cartridge, most salespeople based their recommendation on profit margin and spiffs. A lot of very bad mismatches went out the door even at very high prices. Also, rolling off a 15K would make less than pristine records sound better. I would personally prefer to have these switchable, but that would have added to the bottom line. The price war was brutal at the time, and most buyers had no idea of what they needed. I suspect that this phono stage sounds better than it has a right to. The Akai gear that I have worked with was actually quite good.Dave
Edits: 07/30/14
So far I am pleased with this Akai but that's just after a few days of playing around with it. Thanks for all your input. This has been a learning experience for me.
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