The 1U cases are surprisingly heavy, and have ventilation slots in the side and top covers to help dissipate the heat from the valves
The 1U cases are surprisingly heavy, and have ventilation slots in the side and top covers to help dissipate the heat from the valves. To help keep costs down, the same 4-socket valve circuit board is used in each model, which is why the 2-valve units are shipped with two empty sockets. Although the front panels are finished in indigo (hence the name of the range) with white and blue legend, the rest of the box is simply plated -- presumably another cost-saving measure.
The EQ2011 is a dual, 4-band equaliser providing shelving high and low controls combined with two sweep mid-range controls, rather like the EQ you might find on a good mixing console. Directly before the input Gain control (which has a range of +/- 20dB) comes the Instrument input, an unbalanced jack with switchable Hi or Lo gain settings, the Hi setting being suitable for electric guitars and basses fitted with passive pickups. These will also accept high-impedance mics, but they aren't designed to replace a proper mic preamp. A Peak LED warns of excessive input gain.
A button switches the low-frequency shelving control from 80Hz to 120Hz and up to 12dB of cut or boost is available. A similar range of cut and boost is offered by the two mid-band controls where the low mid can be switched to operate at 250Hz, 500Hz, 1kHz or 2.2kHz, and the high mid can be set to 1.5kHz, 2.2kHz, 3.6kHz or 5kHz. The filter bandwidths of the mid controls are preset, and the high-frequency shelving control, which also has a +/-12dB range, operates at either 8kHz or 12kHz. Each channel has its own Bypass button with status LED.
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