It would depend on what you were going for. There's a bunch of reasons I could think of for using a hot plate with the Road King on either the A or B output, or both. For one, CH 3/4 tend to overpower channels one and 2. You can use a 100 watt setting or 120 watt setting on ch 1 to try and balance, but if you want to use the solo feature, mixing and matching power levels seriously screws your balance. Attenuating the 100+ watt MAY help the balance. This is speculation. I don't own a hotplate. You may have a cab with speakers rated for less than a total of 50 watts you want to use. A click of attenuation may make that a safe combo.
It would really depend on what you intended to accomplish. IMO, though a hotplate wouldn't help out much with a Road King. What kicks *** about turning up the RK is moving more air. Output stage distortion doesn't seem to be in effect as much as in say a plexi-type amp. I don't think you'll see much of an improvement, at least not night and day attenuating the RK over turning down the MV.
I could be wrong.
