Re: what attenuator
ALL attenuators effect the tone and the more you attenuate the signal the more it effects tone!
Also, keep in mind...you are not going to be able to attenuate a 100 watt amp down low enough to use in your bedroom...
Other attenuators you could look into are the
Dr. Z Airbrake but it is only rated at 100 watts...
The THD Hot Plate but it locks you into one impedence
The Ultimate Attenuator, I didn't think it sounded any better or worse than any other attenuator I tried and it costs over $500
The otgers that come to mind are the Tom Scholtz Power Soak and the Marshall Power Brake but I NEVER suggest them to anybody as they are VERY hard on the amp.
I tried lots of attenuators and the one I ended up with is the Weber Mass...if you want the 150 but don't want the big version with all the tone controls and such (BTW...the tone controls do not work unlkess you are using the Mass for DI use) you can call Weber and order a Mass Lite which is the Mass 100 or Mass 150 without the DI tone controls and it's a little less money.