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Need advice on my Parasound JC 1

Please everybody I need some help or rather some advice & feedback from all you JC 1 owners out there.

I bought my pair of JC1s in Feb 2004 & at that time I spoke to Bob (Mr. Crump) about the apparent lack of bass that I felt with these amps. Bob helped me out more than any one can ever ask for!
He explained that my 2 units were from the very 1st initial batch and 2 resistors on the output board for each amp needed to be swapped out. Bob even mailed out the 4 resistors to me in Calgary, Canada & they were replaced by me. Bob if you remember we exchanged many emails between us and thanks for all your advice & help. You are an awesome person to turn to for advice!

Now my system which comprises of the JC1 power amps, Moon P-5 pre-amp, Sony SCD-C555es SACD player & Energy Veritas 2.4 speakers (which are Canadian) still seem to lack bass at times.

Now only for the past 6 weeks I have been passing a signal from my tuner 24/7 thru these amps to burn them in. Since I bought them I have always had them on. However I read in these forums that in order to properly burn them in you have to feed them a signal 24/7 & merely keeping them on won’t burn them in. Is this true? As I have crossed 1400 hours quite sometime back but they were not fed a constant 24/7 signal.

Also I have a feeling that since these Energy Veritas 2.4 speakers have 6 ½ inch woofers (3 per side) & given the JC1s unusually high damping factor, the JC1s are over damping the bass from these speakers, I maybe wrong. What speakers are you guys using with your JC1s and do you think that the next speakers I buy should have 8 or 10 inch woofers. Also I want to get 2 new PC and a pair of new Balanced ICs between my Moon & JC1s, any suggestions. Should I change the Moon & go for a different pre-amp, what pre-amps are you people using?........I am really really confused? Most of my friends who come over seem to comment that the base is lacking, there seems to be no synergy in my system & that’s why I hardly listen to music anymore. Please this is driving me insane all help is welcome.

Also my bias is drifting & the amps are operating differently temperature wise. This has nothing to do with the bass problem as the bias issue is recent and I have always had the bass problem. However I am not happy at all with this bias issue & fail to understand why Parasound could not use better bias pots. I want to change out those bias pots & put better quality ones. Any ideas which make to buy & Bob can you please give me the values so I can adjust them.
jiya3600
jiya3600 OP
15 posts
 
I Live in Toronto now and the JC1's were bought in Edmonton, Canada. The service center here in Toronto informed me that they have not done any bias adjustment on JC1's yet but if i bought them in they could try to do so. The problem is the weight and hassle of carting them around, so I prefer to do this myself if possible.

By the way my line votage is 117V now, I just checked.
jafox
1,447 posts
 
Hmmm, I thought SS amps were supposed to be maintenance free. Now I don't feel so alone with constantly tweaking the bias pots on the CAT amps. 8-)
suzy
30 posts
 
Maybe you are expecting too much bass from a 6.5" woofer? Or it could be your room? I just finished a review of a pair of speakers with 8" bass units. They had plenty of bass in my main listening room. After the review, I moved the speakers to a smaller room that I am in the process of setting up as a second listening room. The same speaker had almost no bass in that room. So I contacted Echo Busters and they sent me a bass trap for each corner. Now the bass is back and then some. Seriously, consider room treatment. I reviewed an early version of the JC-1. That amp should have plenty of deep bass as long as your speakers (and room) are capable of reproducing it.
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