Weber MASS III - 150W - tgt11

Weber MASS III - 150W

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This MASS is unique in that it has an actual tone stack for the speaker signal -- BASS - MIDS - TREBLE. It also has the internal speaker motor for the load, and has a variable line out signal with volume and tone. The unit has two speaker output jacks to support multiple cabinets. The three tone controls can take the signal from whisper quiet to full on with slight humps in the bass, mids, and treble.

Additionally, the MASS III has an active bypass circuit with a footswitch so you can run attenuated or bypassed.
The footswitch has a 12' cable, and the power pack for the switching relays is a 6VDC wall wart.

With no power applied, the attenuator is engaged.

Like all Weber attenuators, you can turn all attenuator controls to zero, pull the speaker, and just use the line out, making the MASS III an (expensive) dummy load.

 

  • 2, 4, 8, 16 ohms
  • 0, 3db, and 6db treble boost
  • MASS bypass
  • Line out
  • Tone stack for line out
  • Tone stack bypass
  • Extra output jack
  • Range switch
  • All controls are on the front panel.

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 zero 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.

All of the complexity and variations in frequency response and impedance occur with the MASS since the speaker motor exhibits physical movement. Therefore, the MASS is just like connecting to a speaker, only the MASS is quiet.

Tone shaping networks are provided for DI and a continuously adjustable output is available to drive an external speaker.

Because of the unique design of the MASS, the speaker may be disconnected entirely when the MASS volume control is set at minimum. This allows the MASS to serve as a dummy load for testing amps, DI-only use, etc. The speaker output signal follows the loudness curve described by Fletcher and Munson. This prevents the tone from becoming flat as you reduce the power to the speaker. The MASS is a passive device, it does not require electrical power.

The Impedance Selector Switch changes the MASS between any four (2, 4, 8, 16) common impedances, one unit works with every amplifier/cabinet....

Important Note:
Connecting the MASS between the amp and speaker requires you to make or purchase some short jumper cables that are at least the same size wire as the cables you are currently using on the amp you intend to use with the MASS.

DO NOT use guitar cables, microphone cables, or other low level signal or shielded cables with the MASS or your amp's output, even for short term testing. You MUST use unshielded cable of the appropriate size for your amp's output.

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