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Old 10th May 2013, 06:28 PM   #631
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A random crackling noise is usually caused by foreign material trapped in the diaphragm-stator gap. A good vacuuming is the first step, and if that doesn't work you may need to re-tension the Mylar with a heat gun (easy does it!) A last resort would be to wash the panels, but I would suggest the first two methods be repeated several times before resorting to washing.

For $200, you can hardly go wrong. Go for it!
Doubt this is but my 2+2 would occassionally rattle, noticed it was with volume up, stuff with a lot of bass, like drum beginning of Van Halens' "Everybody Wants Some". Noticed that the record had a bit of warp to it. Got a new preamp with a low 20hz filter, all is well, Don't know if the amp was clipping or the stats were bottoming out, but it is gone now,
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Old 12th May 2013, 10:25 AM   #632
rpistor is offline rpistor  Germany
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Default Acoustat Spectra 22 with Jeff Rowland Model 8 (?)

I am considering to purchase a pair of JR Model 8 Mono Blocks to drive a pair of Spectra 22.
Does anybody have any experience with this or a similar combination?

The Jeff Rowland amps seem to be a good match for the Acoustat speakers?
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Old 12th May 2013, 10:41 PM   #633
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I am currently powering my 2+2's with a Hafler XL 280. A pair of quicksilver 8417 mono tube amps is for sale in my area for $650. They are rated for 60w- is that enough power for my 2+2's? How would they compare to my current XL 280 in terms of sound quality and sound output?
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Old 13th May 2013, 03:11 AM   #634
john65b is offline john65b  United States
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The Quickie 8417 is a great tube amp, but the 8417 tubes used in that amp were overdriven, and may be problematic as far as reliability - the 8417 tube is VERY EXPENSIVE....if it was converted to 6550 or KT88, it should be ok reliability-wise, and the tube should be relatively cheaper.

I would say yes. The 2+2 has four panels and fairly efficient. If you were thinking of that amp on a Model 1, I would have said no.

I am building a pair of 8417 monoblocks myself from scratch - with KT88 tubes.

If it does not work out, I may be interested in the amps!
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Old 18th May 2013, 02:57 PM   #635
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Originally Posted by rpistor View Post
I am considering to purchase a pair of JR Model 8 Mono Blocks to drive a pair of Spectra 22.
Does anybody have any experience with this or a similar combination?

The Jeff Rowland amps seem to be a good match for the Acoustat speakers?
You lucky devil ANY Jeff Rowland would do a very good job on Acoustats the model 8 is a stereo amp are you using two of them bridged mono if so for me this is OVERKILL and you are losing on QUALITY to get more QUANTITY just try one amp and let us know what you think don't forget that this amp was designed for STEREO amplification good luck and enjoy.
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Old 18th May 2013, 03:07 PM   #636
john65b is offline john65b  United States
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They are monoblocks?
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Old 18th May 2013, 03:08 PM   #637
john65b is offline john65b  United States
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Sorry for double post - I hate my iPhone sometimes
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Last edited by john65b; 18th May 2013 at 03:12 PM.
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Old 18th May 2013, 03:10 PM   #638
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Originally Posted by john65b View Post
The Quickie 8417 is a great tube amp, but the 8417 tubes used in that amp were overdriven, and may be problematic as far as reliability - the 8417 tube is VERY EXPENSIVE....if it was converted to 6550 or KT88, it should be ok reliability-wise, and the tube should be relatively cheaper.

I would say yes. The 2+2 has four panels and fairly efficient. If you were thinking of that amp on a Model 1, I would have said no.

I am building a pair of 8417 monoblocks myself from scratch - with KT88 tubes.

If it does not work out, I may be interested in the amps!
Hi there John is right no problem with the 2+2s BUT with the 1+1s FORGET it 82db efficiency with Acoustat the more panels you have the easier they are to drive and the 1+1s are the worst of the bunch BUT man they sound incredible .
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Old 18th May 2013, 03:35 PM   #639
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They are monoblocks?
Hi John i'm sorry if i am mistaken but i have never seen model 8 as mono blocks i do know of model 3s - model 7s - and model 9s - and in the newer models there are a few BUT i have no interest in their class D amplification i like my amps big & hot.
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Old 18th May 2013, 03:41 PM   #640
john65b is offline john65b  United States
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I also am not familiar with that model. The class D Rowland 501 is quite nice...fwiw
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