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In Reply to: Actually posted by E-Stat on April 13, 2006 at 09:52:19:
I'm not quite following you. You are presumably using VTL MB-450 amps. The passive preamp is apparently a DACT stepped attenuator of unknown value. I'm unclear as to what active preamp you are using, and also what sonic differences you found between the active and the passive.I guess what would be relevant would be the result of your listening tests of (say) the DACT stepped attenuator versus (say) the CJ ART2. I have not done this specific comparison, but I would imagine that the CJ would give better overall sonic results in most systems. And at the same time, I'm sure that the DACT would give very good sonic results in many systems and would be far and away a better value.
As an aside, please note that an active preamp will have a constant output impedance, regardless of the volume setting. On the other hand a passive will exhibit a variable output impedance that depends on the volume setting. For series attenuators (such as the DACT), the highest output impedance (ie, maximum interaction with cables and power amp) will be 1/4 of the input impedance, and is achieved at a volume level that is 6 dB below maximum. (This is typically in the range often used for listening.)
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Follow Ups
- Re: Actually - Charles Hansen 04/13/0612:06:03 04/13/06 (3)
- Details - E-Stat 12:44:36 04/13/06 (2)
- OK, this makes sense - Charles Hansen 15:21:15 04/13/06 (1)
- I still believe the future is simpler - E-Stat 15:32:01 04/13/06 (0)
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