Dr. Z Brake Lite Stand Alone Power Attenuator- Used  From Dr. Z

You asked for for it and we listened…Introducing the fully enclosed Brake Lite SA (Stand Alone.) Same guts as the combo mount Brake Lite, but able to be tossed in the gig bag for use with many different amps on the fly. The Brake Lite SA works with any tube amp up to 45 watts and can be used with 4, 8, or 16, ohm loads. The SA features 2 speaker outs that are wired in parallel. You can now run multiple cabs with ease. 

The Brake Lite SA measures 6" x 5" x 3 ¼" and weighs in at 1 ½ lbs. Four ½" feet give plenty of clearance for resting on top of your amp. At the Zero setting the Brake Lite SA is fully bypassed. Each click yields more attenuation: 1=2dB, 2=5dB, 3=8dB, and 4=11dB.

Always use speaker cable to connect the Brake Lite SA to your speaker. When connecting a second cab you will be making a parallel load. Ex: a pair of 8 ohm cabs use the 4 ohm speaker out on your amp.