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In Reply to: Are Passive Pre-Amps Lacking at Lower-Mids Compared to Active Pre's posted by waj4all on May 14, 2011 at 19:50:37:
All passive preamps I have tried (attenuators or transformers) robbed something from the music in terms of dynamics but it could be the lower mids lacking as you described. I think it has something to do with attenuating the signal just prior to entering the amplifier. An active preamp usually attenuates the signal and then gives it a big boost (i.e. gain is maximum) and its this driven signal that goes into the amp. Usually the gain is quite high (20db) and you have the umph of a good power supply behind it as well (assumming a really good preamp).
I have found that the problem is minimized if you have a VERY good output stage on your DAC, phonostage etc. but most are not good enough.
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Follow Ups
- My experience mirrors your own - morricab 09:16:16 05/16/11 (0)