Hissing coming from EX channel... (1 Viewer)

[Gruson]

Ok, I think I know what the problem is but I want to make sure before I do anything.
My receiver is a Yamaha RX-V1000. I am running the EX surround channel output to my old Sony receiver. (I use 2 speakers for the EX channel). Then I have the speaker wire going out from the Sony to the speakers. I have tried numerous speakers so the speakers are not the problem.
When I match the volume to the other speakers, there is a very annoying hiss coming from both EX speakers. It is very loud and distracting.
Is this caused by Sony Receiver? Should I buy a true amp for it?
Please let me know and thanks.
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Equipment:
Mitsubishi 65907 65" HDTV ISFd Steve Martin
Yamaha RX-V1000 6.1
Paradigm PW2200
Paradigm Studio CC
Paradigm Studio 40s
CV LS-15s
CV LS-8s
Toshiba 6200 Progressive
Pioneer CLD704 LD
Aura Bass Shakers
1080i DirecTV

 

[Phil Iturralde]

I had an old DPL Sony (STR-DE515) once, that exhibited "Hiss", so another Amp (S/N rating @ least -70dB or higher) would be a better choice.
Phil
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http://www.geocities.com/p_iturra