AVS Special Member
Join Date: Jan 2007
Location: Redwood City, CA, USA
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It depends on how the wireless speakers get their sound.
First, realize that a wireless speaker is going to have its own power amplifier -- it will be a "powered speaker." This is not bad in itself (in fact, can be really good), but if the speaker amp design is a cheap job, it'll degrade the sound.
Second, if the sound goes through analog radio modulation, you'll have FM-style signal-to-noise ratio, which is bad.
Third, if the sound goes through the radio as digital, then you're at the mercy of the digital-to-analog converter in the speaker. Given that wireless speakers are designed for convenience, not quality, chances are they saved money there.
Fourth, unless you feed the transmitter a digital signal, the transmitter actually contains A/D converters. See above about how likely these are to be of high quality.
Now, you could put together a high-quality wireless system, using powered speakers of high quality (Mackies, Genelecs, ATCs, etc), some wireless digital transmission doo-dad, and a competent D/A converter at each speaker (or speakers with built-in D/As, such as the Genelec 8200 series). However, I haven't seen a wireless digital transmission doodad that I would trust (although such a thing may exist). Also, you'd pay a lot extra for the convenience, compared to getting just the speakers.