I use a 16ohm hotplate with a Marshall TSL602 and the sound is brilliant. The first two or three steps of attenuation hardly affect the sound at all, after that you can use the bright and deep switches on the hotplate to correct any changes that you might hear - it also has built in noise reduction and an adjustable line out. The only thing you may have to do is to unscrew the clamp that holds the speaker cable inside the amp, to get enough length to reach the hotplate.
