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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

RE: Use Resistor to change speaker from 8 ohm to 4 ohm?

It's hard to believe Nelson Pass would endorse such a thing, unless the amp uses some odd power transistors that are especially sensitive to speaker impedance. But still, it's not a good idea for all the reasons cited below.

I've had the experience of removing a resistor from an RC network defining a high pass filter in Sound Lab speakers. The inherent impedance of the speaker at mid-frequencies (with no crossover) was about 20 ohms on the primary side of the audio step-up transformer. As in your case, SL used an 8-ohm resistor in the RC network, which meant that most of the amplifier power was flowing through the resistor. This also did not suit my OTL tube amplifiers which like a high impedance. Removing the R was a revelation. It dramatically increased SQ and efficiency. (There's more to the story, of course, had to also change the treble transformer for a full range one.)


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  • RE: Use Resistor to change speaker from 8 ohm to 4 ohm? - Lew 09:54:32 07/29/22 (0)

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