Amp to supply 2 ohm mono power

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I think it was Mr. Danley that suggested using a transformer to run the cheap surplus servo motors in a DIY ContraBass. A 2:1 voltage ratio results in a 4:1 impedance transformation. Toroids are supposed to be wider bandwidth than regular transformers, but I haven't noticed any obvious problems using a conventional Hammond transformer, but I've never actually measured the frequency response.

Transformers or autotransformers have been made for the car audio market. This page explains the basics of audio transformers.

I'd try a 2:1 transformer of about 1 to 2 kVA rating. Drive the 240V side from the amp, and hook the speaker to the 120V side.
 
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