This attenuator has a main volume knob and 3-position treble compensation switch which affect the signal to the speaker. It also has a 3-band tone stack and volume control for the line out signal only.

Impedance selector for 2, 4, 8, 16 ohms, 0, 3db, and 6db treble boost, MASS bypass switch, unbalanced line out, tone stack for line out, tone stack bypass, extra output jack, range switch. The MASS employs an actual speaker motor for the load to yield a realistic interaction between the attenuator and the output circuit of the amp. The attenuation is continuously adjustable from -3dB to over -70db using the speaker control and the range switch.

By turning the speaker control to minimum (maximum attenuation), the unit may be used as a dummy load for testing or for DI use.

There is an option to add a headphone output, and this adds an extra jack with an independent volume control. For the footswitch option, we install a relay which requires 7.5V external power. This only powers the relay – the attenuator itself is still passive. We include the power plug but the footswitch itself is not included. You can use any latching footswitch, including one incorporated in a multi-effect floor unit.

This one has the headphone output.

The Mass 100 is recommended for 60 watt amplifier and under.

Will ship anywhere in the continental US at buyers expense.