AVS Special Member
Join Date: Dec 2007
Location: Southern California
Mentioned: 3 Post(s)
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The problem you have is the same problem most HT receiver owners have.
Your receiver is only designed for 8 ohm speakers, and most high-quality speakers (even some "rated" at 8 ohms by the manufacturer), ACTUALLY are as low as 3 or 4 ohms in part of the audio spectrum.
The only way to REALLY find out the REAL impedance of any speaker is to see a GRAPH of the impedance vs frequency for that speaker. This may be available in reviews, but is often hard to get from the manufacturer. They really don't want you to know the truth about this.
Look at some typical Stereophile speaker reviews, where REAL impedance graphs are determined for the speaker by actual TESTING with precision equipment. You will see that there are actually VERY FEW speakers that can truthfully be called "8 ohms".
Speakers that drop down to 4 ohms at some frequencies (and almost all high quality speakers DO) will cause your receiver's amplifiers to distort and so "the speakers will sound bad" (through no fault of the speakers) WHEN DRIVEN BY YOUR RECEIVER.
This is the fault of the cheap amplifier and power supply design that is inherent in 80% of the HT receivers. It is NOT a defect in the speakers; they just need more peak drive current than most HT receivers have available. The few HT receivers that HAVE better power supplies and amplifiers typically cost over $1000 (although a high price does not always mean a good receiver).
The bottom line is that your receiver will only work well (and sound good) with the very few speakers that REALLY have an impedance above 6 ohms at ALL frequencies.
You either need to seek out those speakers that WILL work with your receiver, or get a much better receiver like the Denon 3312 or the Cambridge 651R, which can drive almost any speaker without distorting.