Originally Posted by: PRSplayaI have a 4.5-5 watt tube amp and a 10 watt SS amp. guess which one is louder.......the tube amp by a very long shot. Almost too loud for a 12'x18' room.

[font=trebuchet ms]If those amps are combos, there is another parameter to consider - speaker efficiency.

I believe that tube amps are louder (for reasons listed above), but unless the amps are tested with the same speaker cabs, the results are not very meaningful for a comparison.[/font]