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I have a 1983 Akai AA-R22/L with an original instruction manual that gives some strange specifications to me. I realize some spec sheets are questionable and misleading. This gives its rated power output of 30 watts per channel minimum RMS at 8 ohms from 20 to 20,000 HZ with no more than 0.05% THD. As you scroll down it gives the frequency response for AUX/TAPE as 5 HZ to 80 kHz-3dB. As for PHONO it gives only 30Hz to 15,000 kHZ-+0.5 dB(RIAA)! This seems like a huge disparity to me. What gives? Did Akai just cheapen its PHONO section? Or are many amps and receivers just less honest in giving their specs?
Follow Ups:
I don't see a disparity. The phono stage is a separate amplifier from the line-level section. The minus 3-dB points of the line-level preamp, known as bandwidth, are 5-Hz and 80-kHz. The phono stage section follows the RIAA equalization curve to an accuracy of ±0.5-dB in-between 30-Hz and 15-kHz. The RIAA equalization curve is like a tone control that boosts bass and cuts treble. I see nothing wrong at all with the specifications you quoted. Of course, some phono stages have better RIAA accuracy.
John: Thanks for your input. It's the top frequency of 15,000 kHz on the PHONO stage that confuses me. I would have expected at least 20,000 kHz or am I just wrong about this interpretation? I realize this is not a state of the art receiver.
I doubt it stops reproducing at 15-kHz. Its accuracy is simply not guaranteed to ±0.5-dB past 15-kHz. Perhaps it wasn't the most expensive high-end receiver in its day -- I don't know. I own a cheap Audio Technica AT-PEQ3 phono preamplifier that I paid $45 for brand new and its frequency response goes out to 70-kHz or beyond. Anyway, I don't think you have a problem.
Best regards,
John Elison
I meant to post this in the Vintage forum but all comments are welcome.
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