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In Reply to: Preamp posted by guskund@yahoo.com on April 7, 2007 at 09:59:08:
TRY AGAIN
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That set of outputs is intended for when you drive two amps. Use the "conventional" low impedance output for the bass amp (or single amp) and the high output impedance outputs for the mid/treble tube amp having very high input impedance to maintain the appropriate impedance multiple.As indicated, one must use short runs of IC to keep the capacitance down to prevent HF rolloff. One runs into a similar situation when you use attenuators from a source directly to a power amp.
Must be clear on this...It won't damage the amp, just rolled off in the highes if the IC's are too long ?
Some of David Manley's comments sound omninous, but only from a sonic perspective. I went down the passive route after fighting with having too much gain using a preamp with my current CDP. The CDP has an unusually high output (4 volts) and low impedance (75 ohms). Even when I used the low gain CD input on my ARC preamp, I was getting full gain around 10:00 and didn't have useful control at low levels. BTW, I use a VTL amp that has both high sensitivity and high input impedance. Perfect combination for a passive as it turns out.I finally realized that I should go with that fortuitous combination rather than fight it using attenuators instead. DACT, maker of precision stepped attenuators, has a chart that provides the HF rolloff given certain parameters.
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