10 meters of interconect cable is too long.

So, yes, sound quality and noise are potential issues at that length. That's 30' - OK for balanced cables, not so much for single ended (RCA).

To put this another way, the entire circuit would be 60' long. :)

Thanks for reply. 
Can use xlr convert rca at preamp?
Thanks

Yes, unfortunately you are likely to experience some degradation of sonics at that length, especially given that the interconnections to the amp are single-ended. And a simple RCA-to-XLR adapter at the outputs of the preamp will not help.

However you may want to consider connecting the outputs of the preamp to a Jensen PO-2RX transformer, via short unbalanced interconnects, and connecting the outputs of the transformer to the amps via balanced cables. That would result in the long cables being driven with a true balanced pair of signals. Although in doing so the relatively high output impedance of the preamp (measured by Stereophile as 370 ohms in the midrange and treble, but rising to a very high 6.8K at 20 Hz) could conceivably still be an issue, as the 1:1 turns ratio of the transformer will not change the impedance with which the long cables are driven. Trying it is probably the only way to be sure.

Regards,
-- Al

Thanks for advices, next project will upgrade preamp with xlr connections.
Have a nice weekend, 
KD.