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In Reply to: RE: Tube integrated amp needed posted by double28 on April 24, 2017 at 12:45:23:
The A/B speaker outputs on most solid state amps are run in parallel. It's basically the same as wiring both pairs of speakers to the same output terminals on the amp. The only advantage is the A/B switch makes it easy to run one pair or the other, or both.
Running two 8 ohm speakers in parallel at the same time gives you an effective total impedance of 4 ohms. Solid state amps adapt naturally to that situation (unless your combined impedance is lower than what the amp can handle. Some mass market solid state amps don't like 4 ohm loads. Paralleling two 4 ohm speakers would give you a 2 ohm load which MANY solid state amps wouldn't like.)
Most tube amps use output transformers that have multiples taps. The speaker's impedance should be matched to the correct output tap. The problem with the A/B switch on a tube amp is that it wouldn't automatically switch the transformer tap when the load changed between a single pair of speakers and when the two pairs were all being played. That's why you typically don't see A/B switches on tube amps.
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- RE: Tube integrated amp needed - mlsstl 13:55:31 04/24/17 (0)
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