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In Reply to: Passive vs Active Linestage: My experience posted by mike b on September 18, 1999 at 10:39:41:
What might be going on is some impedance changes going from the passive setup to the active setup.Say you have a CD player with maybe 10Kohms output impedance. OK, now you feed a 100K passive after it, which in turn feeds, say, a 100K amp input impedance.
Ideally you want the input impedance of the following load to be about 10X the output impedance of the stage driving it. But the CD player really sees the two impedances as parallel, 50K, which could conceivably cause a rolloff in some systems.
Now if you run that same CD player into an active preamp whose input impedance is say 100K, that's what the CD player really sees. And now let's say the output impedance of the preamp is maybe 10K ohms or perhaps much lower, and it looks into the 100K amp input impedance. In each case you have a more favorable load impedance, and response may be better preserved.
Just a thought. The actual impedances involved may be very different than those proposed here.
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Follow Ups
- Re: Passive vs Active Linestage: My experience - Doc B. 15:17:12 09/18/99 (3)
- Would using input and output transformers solve this problem? - Joe II 18:13:27 09/21/99 (0)
- Re: Passive vs Active Linestage: My experience - mike b 16:56:05 09/18/99 (0)
- Re: Passive vs Active Linestage: My experience - Keith 15:24:29 09/18/99 (0)
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