Jeff Rowland Model 501 - Help ...

Thank you very much for your comment. You saved me from having a lot of trouble. I wonder only how they get all these certifications, when having such a product ... ?

Kijanki,

Thanks a lot for your answer. I asked a friend of mine to test this JR's by putting them near TV and FM radio sets and after I get the message from him, I will also let you know ...

One question more: this carrier signal that you are mentioning, that travels through speaker cables - does it produce any noise in the speaker tweeters ? I have Focal Electra 1027 Be speakers with Berillium tweeter. All cables are Crystal Cable (very well shielded). Speaker cable is Crystal Cable Micro.

I promised to provide a feedback from a friend who tested these Jeff Rowlands ... so here it is ...

He installed JR Model 501 monos in a system where Primare was a preamp and the speakers are Harbeth. CRT TV was about 20 cm away from monos (they were put one on another) and the FM tuner was somewhere about 80 cm away from these monos. Power cords of these monos were plugged into separate wall mains from the rest of the system.

He could hear a brum on all radio stations (cable network reception) and the picture on some (not all) TV stations was clearly degraded. It is a clear evidence of some, not negligible, radiation from these units.

Therefore I decided not to go after these babies although, as I already mentioned, the offer is really good one. That is pity, because I know that they can produce, with the right speakers, excellent sound reproduction.

I wish to thank to you ALL for your advices and comments ...

@Macrojack

It is very difficult to find out the truth in HiFi ... in general. For example: you have different JR units (which are as far as I remember the later models) and completely different TV technology. FM is though the same.

I had for example the opportunity to talk to Jeff Rowland on Muenchen HiFi show, two weeks ago. And I asked him explicitely about radiation of 501's and he told me that they are safe concerning that matter. He told me even that JR has in their testing room an FM tuner placed on these mono's and that there are no degradation of FM signal.

I have no reason not to believe Jeff Rowland but friend of mine does not have any reason not to tell me the truth. He will though repeat the test in a completely different system (another friend of ours will be involved).

The only conclusion is that the radiation might be, under certain circumstances, an issue, depending probably on many factors. But that risk is to high for me ...