Home Speaker Asylum

General speaker questions for audio and home theater.

Re: Has to do with UL testing procedures...

Well, the test procedures are mandated by the Federal Trade Commission (not UL) which has regulations regarding audio amplifier power output claims in advertising.

Power bandwidth must be specified and distortion levels must be specificed. You will notice that many inexpensive recievers specify a power bandwidth of 40-20,000 Hz, not 20-20,000 Hz. That's because the receiver will not deliver rated power at 20 or 30 Hz. Similarly, since the same number of watts at 4 ohms as at 8 ohms requires more amps (current), many receivers do not specify a 4 ohm output because their wimpy power supplies will not deliver enough current to generate a respectable rated power over a decent bandwidth and with respectable distortion figures.

I would think that, for all but the most expensive receivers, the use of 4 ohm speakers would not be a good idea if you're interested in the best sound quality.


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