Well...It finally arrived today. I purchased the Weber Mini Mass 50 watt attenuator. It features a 4/8/16 ohm speaker switch along with built in treble boost and a line out. The Mini Mass utilizes an actual speaker motor for attenuation. The unit does not require a power source. Price was $90 on Xmas special, regular $100. Construction: Electronics are housed in a heavy steel box. Switches and knob are high quality and feel very solid. Rubber feet on bottom of unit keep it in place in super sonic sound conditions. The purpose of the unit, (for those who don't know), is to attenuate, or cut, the amount of watts going to the speaker from the amplifier. This unit plugs in between the two with user provided speaker cables w/1/4" connectors. An adjustment/volume knob on the front allows a trickle to full signal going to the speaker. There is also a bypass switch. I have a Blues Junior amp with a couple of BillM mods. I did the reverb mod along with the bias adjustment to cool the tube down. I also did another but can't remember what it did. Something with the tone though and it worked 'cause now it sounds much better. The problem with the BJ is getting break up at a volume level suitable for home practice. It's possible to turn the Master to 1 and Volume to 12 but then the amp sounds a little thin. The amp also sounds very good on the clean settings...but again, to get good tone the volume was excessive. The Weber takes care of both those issues. The amp can be set to full Master and Volume with the Mini Mass set to a comfortable listening level. Tone is nearly identical to a straight in connection. I say nearly because speaker breakup is not happening at lower volume levels. I also suspect a bit of bass is gone because of the watts needed to get the driver to move air. The Mini Mass does not "color" the sound. I A/B'd the unit by using the bypass switch and by completely removing it from the amp. Both methods sounded the same. It is extremely quiet and introduces no audible hiss or hum. Final thoughts: This unit is worth every penny paid. I now have a method of utilizing EVERY setting possible on the BJ amp at comfortable listening levels. I would think the Mini Mass would be useful for live performance. Mic'ing the amp would get the tone needed into the PA system while the unit would keep the monitor level appropriate. I'm thinking Church use here.