Balanced Input to RCA Adapters? - AVS Forum
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post #1 of 13 Old 11-29-2003, 02:47 PM - Thread Starter
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I have recently purchased a used Classe CA-100 power amplifier, and from some of the research I have done I am aware that this model will often suffer from rather high levels of hum when using the RCA inputs. Unfortunately, my current pre-amp only has RCA out to the power amp.

I am wondering if there is any high quality gear available that will allow me to use balanced cables to connect to my pre-amp without losing much in the way of sound quality (or defeating the purpose of using a balanced input.)

This would probably be a temporary solution should I find that the amplifier hums quite a bit in my room... I will be upgrading to a pre-amp that supports balanced out sometime in the next year. The power amp hasn't arrived yet, but I'm trying to be prepared just in case I have to go down this road.

thanks in advance for any advice!

-Blaine
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post #2 of 13 Old 11-29-2003, 04:42 PM
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Blaine, especially because you will be replacing the preamp soon, I would wait to see if you have hum, rather than assume you will. Hook up the amp and give a listen with the RCA's first.

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post #3 of 13 Old 11-29-2003, 09:34 PM
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Both Markertek (http://www.markertek.com/MTStore/Sto...&button=Search) and Radio Shack sell RCA to Balanced adapters but I can't attest to their fidelity. These adapters get the impedance right (75ohm to 110ohm) but I'm not sure they can create the differential signal required at the input of your amp.

As long as the RCA connectors are tight there shouldn't be significant hum from the Classe amp. I'm with Larry, first try the RCA connections because the RCA to XLR adapters can be more trouble than they're worth.

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post #4 of 13 Old 11-29-2003, 09:41 PM
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Sorry, my Markertek link was in error. Go to Markertek HOME then search on "Neutrik xlr audio adapter". Then click on the link in the search window.

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post #5 of 13 Old 12-02-2003, 07:27 AM
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Don't use the Neutric adapters, I've tried them and they sound terrible.

IMO the 'best' adapters are those made by Ayre Acoustics.
http://www.ayre.com/products/phadapt.htm

Another very good option is to use transformers instead of adapters from Jenson transformers.
http://www.jensen-transformers.com/pc2xr.html
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post #6 of 13 Old 12-02-2003, 05:12 PM
 
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Quote:
These adapters get the impedance right (75ohm to 110ohm) but I'm not sure they can create the differential signal required at the input of your amp.
Those are for converting balanced AES/EBU to unbalanced, not for analog audio.

Quote:
IMO the 'best' adapters are those made by Ayre Acoustics.
Those are just pin adaptors, they're of no use.

A balanced connection only has benefit when both source and destination are balanced.
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post #7 of 13 Old 12-04-2003, 09:51 AM
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The "Balance Buddy" from Rane converts unbalanced RCA outputs to balanced XLR. Rane builds very high quality audio gear.

http://www.rane.com/bb22.html

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post #8 of 13 Old 12-27-2003, 08:08 AM
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Greetings,


I have seen cables with XLR connections on one end and RCA on the other. How would something like that work if you have a preamp with Balanced outputs and an amp with unbalanced inputs?


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post #9 of 13 Old 12-27-2003, 01:35 PM
 
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IMO the best adapters are made by Purist Audio.

http://www.puristaudiodesign.com/index2.html
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post #10 of 13 Old 12-27-2003, 02:31 PM
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post #11 of 13 Old 12-28-2003, 07:33 AM
 
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Quote:
Originally posted by placidman
Greetings,


I have seen cables with XLR connections on one end and RCA on the other. How would something like that work if you have a preamp with Balanced outputs and an amp with unbalanced inputs?


Regards,
It doesn't work as a balanced connection, there are no benefits to it at all.
Both source and load must be balanced to realise the advantages of it.
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post #12 of 13 Old 12-28-2003, 03:47 PM
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Quote:
Originally posted by tvtech1
It doesn't work as a balanced connection, there are no benefits to it at all.
Both source and load must be balanced to realise the advantages of it.
Greetings,


That is what I thought. Thanks for the response.



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post #13 of 13 Old 12-28-2003, 05:12 PM
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Jensen's rca to XLR converters are not the same as th simple neutrik adapters. The Jensens actually output a balanced signal and are exacltly the same as the balanced outputs on the vast majority of xlr equiped components. You can also try Pro equipment maker Radio Desgin Labs (Markertek)

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