need info on Threshold 4000 amp - AVS Forum
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post #1 of 9 Old 09-21-2010, 02:41 PM - Thread Starter
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I have a chance to pickup a Threshold 4000 2 channel amp however I don't know much about the amp. The only thing I know about the amp is that it is an older design class A power. The seller has had it upgraded I believe to stasis and it has the xlr inputs. I have a pair of Paradigm S8 speakers and would like to know if this would be a good match. Any info would be appreciated. Purchasing price would be around $1300.00. reliability power and control and all other observations would be appreciated.
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post #2 of 9 Old 09-21-2010, 05:46 PM
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The Threshold 4000 is the last in line of the Stasis series. The amp was designed by Nelson Pass one of the great audio designers. It's rated at 200wpc in pure Class A. As a mono block it will go to 700wpc. In todays market a 200wpc class A amp would cost you $15-$20000. I have a pair of modified Threshold T-50's the run at 100wpc in class a and they run my Aerial model 6's without breaking a sweat. Being they are class a they will run very hot so the best way to run this amp is on an open amp stand don't put it in a closed rack it needs air. If you have a problem w/the amp contact Jon Soderberg at Vintage Audio. He worked w/Nelson Pass during the Threshold years and is the foremost expert on these amps. During the past years I've demoed Audio Research, McIntosh, Cary, Parasound Halo etc. and could never find an amp that could top my Thresholds. By the way check out Nelson Pass on line an intresting history.
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post #3 of 9 Old 09-21-2010, 07:14 PM - Thread Starter
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Thanks for the input, can you think of anything that compete with this amp at this price? sounds like I should not pass this up?
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post #4 of 9 Old 09-21-2010, 08:39 PM
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first a correction I meant 400wpc as a mono block hit the wrong key. For classic amps Forte 4a (the budget Threshold) if you can find one goes for about $700. T series Thresholds go for $1000-$1500. On the new side Parasound amps can be had from $550-$1350 depending how much power you require. Belles very nice also CIAUDIO mono blocks $1549 for the pair. But getting back to the 4000 it's a classic amp nice tube like sound with plenty of power. As far as age is concerned mine are around 15 yrs. old and no problems. You can go on line and check out the Threshold 4000. By the way the amps are not the oldest components in my system that belongs to the 32yr. old Linn Sondek LP12 TT. Still sounds great. Have fun in your decision.
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post #5 of 9 Old 09-23-2010, 07:55 PM
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audiogon shows the 4000 introduced in 1978? 200w x 2. original retail $2160 (which was some serious cash in 1978!), current used average $710.

never heard one myself, though i've heard other stasis amps (s-500 primarily). the age would give me serious concern. ever looked at what getting a high end amp re-capped costs?
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post #6 of 9 Old 09-30-2010, 10:53 PM
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I would want to replace the supply caps on the 4000 given their age. You may also want to update the rear connections also. Jon Soderberg in CA is highly recommended. From experience, it will prolly run several hundred dollars though. You can email him at vintageamp@comcast.net

See also:

http://www.diyaudio.com/forums/pass-...equipment.html

The 4000 was one of the early Nelson Pass amps with the STASIS technology, which ended in the early/mid 90's with the e-series. I've had my e-series amp for a little less than 20 years and it's still going strong (re-capped a few years ago).

I've never heard the 4000 but the ones to look for in that era are the Stasis 1, 2, 3.
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post #7 of 9 Old 09-30-2010, 10:59 PM
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For about $1300, I would get a used Aleph 5 - 60W/ch, stereo, class A (and prolly biased a lot higher into class A than the 4000).

And it's a Nelson Pass design! =)
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post #8 of 9 Old 10-01-2010, 03:57 AM - Thread Starter
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Im sure that these are fine amps given the reviews that I have read. My funds however are not infinite and the idea of purchasing a used amp for $2000.00 or more with no warranty then having something go wrong was feeling a bit unsettling. I am currently auditioning in my home a pair of Evotiva XPA-1 500W class A/B fully differential monoblocks, at approx 80 lbs each their construction seems top notch and are more detailed than my previous Anthem A5 which in itself was an excellent amp. I figured for $999.00 each and $25 shipping for each amp, 30 day trail period with a 5 year warranty it was an easier decision to make. http://emotiva.com/xpa1.shtm
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post #9 of 9 Old 10-01-2010, 09:52 AM
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good luck. but i wouldn't worry too much about buying a high end, used solid state amp within 10 years or so (source component and tube amps are different story). the 4000 is a bit older than that though.

still, if you ever have a chance, take a listen to a highly biased or singled ended pure class A solid state amp. you'll hear why they are so coveted.
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