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Originally Posted by samtastic  Ok. the signal is coming out of a (grounded) Sansui turntable, into the phono input of a Marantz amplifier, then coming from the amp's headphone socket into my computer's line-in. |
I'm not sure what level the Sansui turntable is at, or what type of cartridge, tonearm, etc., modifications you might have made...but I do know that unless your Marantz is decades old that these days a dedicated phono pre-amp, even ones in the $150 range, will do a much better job with your signal than a built-in phono input on a receiver.
I have a Goldring GR-2 turntable and originally had it going into the phono input of an Onkyo TX-SR805 and when I upgraded to the $150 Parasound Zphono preamp it made a night and day difference in the level, clarity and frequency response/punch of every record I put on.