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In Reply to: RE: Tympani IVs in a 12x 22 x9 room posted by Kythyn on May 15, 2017 at 16:24:08
FWIW, for several years I had no trouble and enjoyed listening to my T IV-As using 2 of the original bridged GFA 555s, (as if each were a monoblock). I could played the speakers loud with no blown fuses, nor any other difficulty. I also did use the Adcom 555s to bi-amp the speakers to no advantage but requires a lot of nasty extra cables and speaker wiring (in addition to Magnepan's X-O). I also used a restored Adcom GFP 565 pre-amp, which I still use today. There wasn't anything wrong with this 565, but having it recapped provided some peace of mind, even though I couldn't detect a difference, (as if I added a $350 Tice Clock to my system).
Follow Ups:
Would you consider using the GFA-555 and GFA-555 II together as monoblocks? Or is there some sort of difference between the two that makes that undesirable?
IMO it's a try, (the 555 and 555II bridged consideration), as it couldn't do any harm, paying attention to learn if both speakers are performing similarly (both levels and sound quality) perhaps playing a 'mono' recording or if available engaging a 'mono' switch on a pre-amp even with a 'stereo' recording. I would swap the amps as well.
They will not do well with the 4 ohm load in bridged mono operation. It is better to biamp with the two amps instead. One amp per mid/tweeters and one for the bass . If the slight differences between them are not something that bothers you then you can vertically biamp one amp per speaker and save on a load of speaker cable.
Satie,There is a Crown Macro Reference available on Audiogon now. Would that be sufficient to power all six panels? Or is the Odyssey Kahartago and Adcom GFA-555 bi-amp a better option?
Edits: 05/16/17 05/18/17
The Crown Macro Reference can power up the whole speaker. better than the Khartago+ Adcom 555. But the Macro is hard a bit bright and thin sounding on top though it is transparent and detailed. The Odyssey amps are richer and fuller sounding. Using the Crown on top would make it necessary to match it with a tube preamp and/or solid core copper wiring..
The Crown would make for a terrific bass amp though. I use a Crown 5002 for my bass panels.
It seems then that the options are:1) Bi-amp with Odyssey Khartago on MT and Adcom GFA-555 on bass
2) Power all six panels with the Crown Macro Reference.
3) Bi-amp with the Adcom on MT and the Crown on bass?
There is an Audio by Van Alstine PAS 4i all tube preamp on audiogon for $439. Would be a good match with the Crown Macro Reference?
Please share your thoughts.
Edits: 05/17/17
Yes, the Van Alstine PAS mods are very good with tighter bass and more extended treble than the original Dyna pre. It will do fine driving a 10K input impedance but noticeably better into 50K.
The Van Alstine PAS tube pre-amp will be a real good match with any solid state amp, as long as it's output impedance isn't too high for the amp's input impedance (observing the old 10-to-1 ratio rule. A 1k output with a 10k input, for instance.). I had one years ago, and it's a nice pre, not too warm (without the Van Alstine mod, the PAS has the old classic tube sound).
Each Tympani panel is 16" wide, so a 3-panel array is actually 48"/4' wide, a pair taking up "only" 8' of room width. Still a lot, but less than 9'!
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