New! Magus Innovations Dynamic Enhancer.  Unique design incorporates two transformers, one of which is in series with your speaker to control the voltage to your speakers. The result is a bolder sounding amplifier with the added control of 8db dynamic range. Make your 2 tube amp sound like 4 and have the headroom you were missing as well as down to -4db attenuation! The Magus Dynamic Enhancer is also recommended for players of 50 watt amps that need the tight bottom and complexity of tone of the 100 watt versions.

Should I get the UA or the Dynamic Enhancer?
If you need attenuation, the UA is the way to go.
The Dynamic Enhancer is intended for enhancing your amps tone and only supplies minimal attenuation, about -4db which is often not enough. It also supplies about +4db's extra headroom as well, making it ideal for smaller amps that occasionally lack headroom.
The UA is capable of over -64db attenuation with the bedroom switch.