The OTB16 is a 16 channel 1U mixer with 16 balanced inputs and the famous Tonelux discrete summing bus.
Each channel has a level control, a panner with a center detent, a level indicator and each pair of channels has a LINK button
to link the right level control to the left control.
Access to the OTB16 is through 2 eight channel Balanced Dsub inputs at a level of +4dBu nominal, using the
DA-88 type pinout.
The summing of the 16 channels is through the famous Tonelux TX-240 and TX-260 discrete op-amps, and then through the
Tonelux TX-100 output transformer.
The Mixer output can be adjusted with the MSTR Fader, sending the signal out of the two XLR connectors marked "MIX OUT".
Additionally there is a Monitor output for monitoring or for expansion, which is balanced but transformerless. This output is
before the MSTR Fader.
Also on the rear panel are 2 additional Balanced inputs to the MIX bus via 1/4" jacks. These can be used to insert other mixers
into the Tonelux mix bus, or they can be used as the inputs from other OTB-16 mixers for expansion.
The power for the OTB-16 can be 120 or 230 volts AC 50/60 Hz.