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Path: utzoo!watmath!clyde!burl!ulysses!allegra!alice!ark
From: ark@alice.UucP (Andrew Koenig)
Newsgroups: net.audio
Subject: Re: Pad line level to phono level
Message-ID: <4403@alice.UUCP>
Date: Tue, 8-Oct-85 20:25:01 EDT
Article-I.D.: alice.4403
Posted: Tue Oct  8 20:25:01 1985
Date-Received: Sat, 12-Oct-85 12:24:16 EDT
References: <281@kepler.UUCP>
Organization: Bell Labs, Murray Hill
Lines: 20

> I'd like to be able to play my CD through my friend's Onkyo receiver/amp.
> Problem is the receiver has no other inputs besides the phono preamp
> inputs.  (Grrrrr.)

A receiver with no tape inputs?  This is difficult to believe.

It is possible, though a nuisance, to build a circuit that would
allow a CD player to feed a phono input.  The only real problem
is that the frequency response of a phono input is nowhere near
flat.  Instead, it follows the "RIAA Equalization Curve," a standard
agreed to by audio manufacturers.  The reason for this non-flatness
is complicated, but basically it allows a lot more information to fit
on a record than would be possible otherwise.

Thus, you must build an inverse RIAA filter, which, if done passively,
will probably have about the right amount of signal loss.  Then you
must amplify that signal again (in the phono preamp), thus losing
some of the CD's dynamic range.

I suggest you not bother.