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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: I think making measurements or studying measurements made by others before an audition may be a mistake posted by Richard BassNut Greene on September 20, 2007 at 09:10:33:
Tubeguy:
Specifications are not necessarily done to exacting standards.
But if you take 10 amps and measure all ten using the same measurement technique and equipment, then you may be able to start making corollaries between what is measured and what is heard. If you took only the specifications, you'd be comparing apples to oranges data wise, since the data could well be dervied from varied measurement and testing techniques. Amp manufacturers LOVE to exaggerate - and normally only professional amplifier makers will cite the standards to which the amp was built and for which the specifications were obtained.
You can't dismiss the validity or usefulness of measurements because "specifications" are known to differ from one manufacturer to another. In fact, in engineering, it's up to the engineer or designer to determine whether or not given specifications are derived from the appropriate STANDARDS. In amp specs, sometimes these standards are listed or cited for certain measurements, like AES or IEC standards. Other times they are not, and the end user is really left guessing.
There are many amps rated for 400 W/channel, but this is "program" power or "instantaneous" power, and not RMS power. Even RMS power measurements are done differently from company to company, unless they follow a specific standard to the letter.
Cheers,
Presto
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Follow Ups
- You're confusing measurements with "specifications" - Presto 09/20/0712:21:26 09/20/07 (8)
- I may be confused about things in general, but I'm not confusing measurements and specs - Richard BassNut Greene 14:16:57 09/21/07 (0)
- Name them... - rick_m 19:46:48 09/20/07 (4)
- Interesting stuff. Read this article on the FTC amp rules... - Presto 22:39:33 09/20/07 (3)
- Bummer... - rick_m 08:04:57 09/21/07 (2)
- RE: Bummer... - Dan Banquer 08:37:05 09/21/07 (0)
- It certainly is! (nt) - Pat D 08:29:58 09/21/07 (0)
- RE: You're confusing measurements with "specifications" - thetubeguy1954 13:10:37 09/20/07 (1)
- Ooops. That was for you, Tubeguy, not RBNG... but anyways... - Presto 15:34:40 09/20/07 (0)
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