My fronts have a sensitivity of 98dB; I guess you would call that high. The hiss I hear is very faint, and can only be heard by putting my ear to the tweeter. It's not what I would call bothersome and I'd be surprised if anyone with 90dB speakers would be able to hear it. Unless your units are putting out FAR more noise than mine, or you have an obscenely high gain amplifier (I'm using the 755).

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Matthew J. Hill
matt@idsi.net