|   mac preamps | estan
Apr 14, 2001 3:19 AM | | are any of you familiar with the low frequency trim pots on Mac tube preamps?
thanks,
Stan |
| re: mac preamps | Brian Levy
Apr 14, 2001 11:42 AM | | On the C28, it adds up to 6db of bass starting at about 100hz. In the past I've not found it useful but, in my new house it has helped without degrading the bass resolution. The room has not been set up in any manner and needs a complete buildout and treatment so I imagine that in the end it again will be redundant. I've never used my system in say a living room or room that has been designed around other than a sound room. Therefore, it is possible in many environments, it will be useful. In the "old" days, when we demo'd the Mc systems in our soundrooms, the bass boost was an advantage because of all those woofers in the room pulsating to the bass.
Oh, just remembered, it does help the Klipsch Heresy with its low end rolloff. The rise is not linear and seems to come in about where the Klipsch can really use the support. |
| re: mac preamps | estan
Apr 15, 2001 4:27 PM | | Brian is that to mean the reponse is flat with the setting at "min"?
What frequency then does the bass tone control boost or cut. Doesn't the trim control work at the preamp input and the tone in the amplification stage?
Thanks,
Stan |
| re: mac preamps | Brian Levy
Apr 16, 2001 4:26 PM | | Yes, At min, the response is set to flat. From memory, the bass turnover point is higher than this. I think both are in the amp circuits since the trim increases rather than decreases the bass response.
My manuals are still packed away and I don;t remember the specifics. Possibly someone has a manual who can look in the back which has the contours and block diagrams. My preamp is in a case and I can't pull it out far enough to get a look at the block diagram. |
| |
