Hissing sound coming from tweeters

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What Dtc said

IMHO your amps are not an ideal match for your speakers. You have way too much gain and even though price does not always indicate quality you have a $3,500 preamp with $300 amplifiers. I think you need to pony up for an amp that is a better match; less power, less gain, higher quality.

To test it don't just power it up with the inputs disconnected, many amps will be noisy when run without inputs. You need some shorting plugs in the inputs then turn it on to see if it hisses by itself. Or disconnect the interconnects at the preamp and short the middle pin to the ring. Stuff a little aluminum foil in there or use a jumper with clips.

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Looks like the amps had been designed with insufficient feedback making them unstable and hiss the tweeters.

Thanks for all the helpful information. I'm at work right now, but when I get home tonight I will disconnect the amps from the pre-amp to determine if this is just a noise floor issue. I understand that the Ayre pre-amp might not pair well with the cheap Emotivas, or maybe the Emotivas have too much gain for my sensitive Klipsch speakers. Once the music is on you dont hear the hiss and it sounds amazing. The hiss is most annoying when you're trying to watch a blu-ray during a quiet scene.

@Herman: In this hobby you can't always afford to buy all the nice gear in one purchase. I just picked up the Ayre and will be looking to upgrade my mono amps in the future. I am 25 years old and my system is a work in progress.

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Yes sir, pay as you go. It wasn't a criticism, it was a suggestions. Sorry if it came off any other way.

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No worries Herman, I appreciate the suggestions and didn't take it as criticism. What kind of amps would you recommend to go with highly sensitive speakers? I probably couldn't go wrong with an Ayre power amp to match my pre-amp, but I'm open to other suggestions.