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The OTB16 is a 16 channel 1U mixer with 16 balanced inputs and a Tonelux discrete summing bus.
Each channel has a level control and a panner, and each pair of channels has a button that slaves the right channel level control to the left channel level control. Each channel also has a dual color LED, which shows signal level in green and then switches to red at +14dBu. The access to the OTB16 is through 2 eight channel Dsub inputs at a level of +4dBu nominal.
The summing of the 16 channels is through the famous Tonelux TX-240 and TX-260 discrete op-amps, and then throught the main output transformer, which can be adjusted by the MASTER fader pot, which comes out of a pair of XLR connectors. Additionally there is a pre-master fader output for monitoring or for expansion, which is balanced but transformerless, and 2 additional balanced EXT inputs to the MIX bus.
The additional pre fader output can be plugged into the EXT input to extend the number of channels with a second or third OTB16. 120 0r 230 volts AC powered 50/60 Hz.