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Topic: Impedance switch on a Class-D amp? (Read 257 times) previous topic - next topic
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Impedance switch on a Class-D amp?

Hi all. I recently bought one of the little Vox MV50 guitar amps. This uses the NuTube preamp tube, but is a class D amp. I don't understand why this thing would have an impedance switch on the back. I didn't think that mattered with a class-D amp. (Or any other solid-state amp, for that matter.) Is this just a marketing gimmick to help create the illusion that this is a "tube" amp? Or is this actually needed in this application?

Thanks all;
Artie



 

Re: Impedance switch on a Class-D amp?

Reply #1
It probably just caps the power so that you don't damage low impedance speakers. 

Re: Impedance switch on a Class-D amp?

Reply #2
Actually it can mather with class-D but that depends of the design, this is rare as most class-D are designed in a way that this don't happen, in the class-D the output speaker impedance can affect the response of the output filter an this switch can possibly tune the output filter to obtain allways the same response.

Re: Impedance switch on a Class-D amp?

Reply #3
Actually it can mather with class-D but that depends of the design, this is rare as most class-D are designed in a way that this don't happen, in the class-D the output speaker impedance can affect the response of the output filter an this switch can possibly tune the output filter to obtain allways the same response.

Yeah . . . I was thinking it was just a tone-shaping option. I suppose I could switch it while using the same speaker and hear what difference it might make. I'd do this, of course, at lower volumes.

 
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