Parasound JC-1 Questions

1. No problem at all turning them on and off as needed. They sound better after about 45 minutes of playing music and are pretty much fully warmed up after 90 minutes.

2. I don't know. What is the heat dissipation of a Krell? It may be possible to estimate that of a JC-1 as follows. Continuous power output into 4 ohms is 800 watts RMS, while the input power while driving that load at full power is 1280 watts. Thus it would follow the 480 watts difference is dissipated as heat, or about 1640 BTU/hr. Of course in actual use it wouldn't be driving a purely resistive load, nor would it be operating at full power output continuously. So the real power dissipation would be a fraction of that.

3. No, but then I bought them as a consumer before becoming a dealer for them.

Brian

#1,no need to leave on all the time.just let them warm up a bit.#2dont know about comparison,but the jc-1 do run very warm in class a.#3these currently sell 4000.00 or less here,i dont how you can do better for s.s.had c-j prem.140 prior,and to me i lost nothing and gained bass clarity.both are excellent.

1. No need to leave them on all the time. In my system they sound their best after they have been on for at least 90 minutes, and even better as the day goes on.
2. Don't know about the Krells. The JC-1's get pretty warm on LOW BIAS, and pretty hot on HIGH BIAS, but not excessively so in my personal opinion.
3. No regrets at all! These amps have the deepest, tightest, and most powerful bass I have ever heard in my system, as well as exceptional speed, transparency, focus, and detail resolution. They have great image width and depth, and very clearly resolve fine and subtle nuances in the music, as well as reverb trails, etc. They are also notably free from etch, grain, and glare. They also have excellent top-end extension and a very palpable midrange.
All this, and my system is no where near state-of-the-art, nor even that expensive in audiophile terms!
But, they must be FULLY BROKEN-IN to sound their best! This takes about 60 days of 24/7 music signal being played through them. I used an AM/FM tuner, with the volume on my preamp turned just above a whisper for 60 days, 24/7 to break mine in. Simply leaving them on all the time with no music signal for 60 days, 24/7, WILL NOT BREAK THEM IN! They must have a signal to properly and fully break them in.
They sound decent out of the box and up until they fully break-in, but once they do break-in, WOW! They suddenly transform, they are in a different league! They are truly amazing once they hit that stride. Up until they do break-in, they are very unpredictable...a few days they will sound closed-in, rolled-off, dark, excessively warm, and boomy in the bass...then other days they will sound thin, forward, and bright. They also have virtually no image depth at first, but they have it in SPADES after break-in.
Once break-in occurs, they are become exceptionally neutral, and their outstanding sonic characteristics and strengths do not change.
These were MY personal experiences with my JC-1's, in MY personal stereo system. Others experiences with them may vary.
Hope this helps.

I have to say that I am the only one does not think that they get that hot. I have them on a rack iwth the recomended 6 inches of clearence abouve them, and they really are really just warm to the touch (now you have to tkae into consideration that before I got them everyone said they would be extremely hot...so perhaps by expectations simply exceded reality). The answer is while they are running in hi bias mode I can easily put my hands on top of them without burning myself. I hope that helps.

Dan

Thanks for the response's, very helpfull and interesting.

I have read some old posts regarding the long break in period, 60 days of 24-7 is a long time to achieve consistant performance, but sounds like most agree the wait is worth it.

I am glad to hear the amps perform well after a hour or so of warm up, that makes the heat factor less of a concern for me.