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- From: hedrick@geneva.rutgers.edu (Charles Hedrick)
- Newsgroups: rec.audio
- Subject: Re: question on pre-amplifiers
- Message-ID: <Dec.12.22.35.56.1992.293@geneva.rutgers.edu>
- Date: 13 Dec 92 03:35:56 GMT
- References: <184607@pyramid.pyramid.com>
- Distribution: usa
- Organization: Rutgers Univ., New Brunswick, N.J.
- Lines: 20
-
- Zeming Gao asked whether you can use a CD without a preamp, by
- connecting the variable output directly to a power amp.
-
- Several people have commented in the past that it works, but typically
- quality suffers. This agrees with my experience. I have a fairly
- good quality CD player (Luxman DZ 121, I believe, though I could be
- off by a digit in the model number). I was driving a Hafler power amp
- from it. I was bothered by a lack of highs. By inserting a preamp
- (also Hafler), the highs appeared. Lon Stowell compared the original
- setup to use of a "passive preamp". Interestingly, reviews of them
- normally note that the highs are somewhat attenuated compared to a
- regular preamp, because of impedance matching problems that I've never
- quite understood.
-
- Thus I'd suggest that if you decide to drive a power amp directly from
- the variable output of your CD player, you might want to find some way
- to see whether you're really getting all the high frequencies you
- should be getting. It's obviously possible to build a variable output
- that would work (presumably by inserting a unity-gain amplifier
- afterwards), but that seems not to be common.
-