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Adding Trinnov ST-2 room equalisation to TMC-1-Penta system

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I was recently asked the best way to add a Trinnov ST-2 to a TMC-1 system. The TMC-1-Penta can be configured to have inserts in the output path which is ideal for for this application.

The three main advantages of using room correction in the inserts and not after the outputs are as follows

  1. The volume control is after the room correction

  2. You can use the same room correction on multiple speaker sets by switching both outputs and profiles

  3. The TMC-1 has a insert key to enable/disable the room correction.

The ST-2 has both Analogue and AES I/O, the obvious choice in this case is to use the AES I/O.
The ST-2 GPIO option provides remote profile selection, to simplify operation we decided to to select the ST-2 profile when the speaker set is selected by the TMC-1. This was achieved by adding speaker set selection to the GP Out 1, 2 and 3 function select in TMC-1 advanced menu's 18, 19 and 20 and connecting GP outputs on the TMC-1 to GP inputs on the ST-2.

Connections between the TMC-1 and ST-2,

  • Note 1. The DB25 is a 25 pin ‘D’ Male and the DB15 is a 15 pin ‘D’ Female

  • Note 2. A 5v-24v external power supply is required.to power the ST-2 Opto-coupled inputs, the TMC-1 outputs are open collector. I used 5v USB power from the ST-2 (cut a USB lead in half red and black wires).

  • Note 3. Samuel Tracol (Trinnov) suggests using the "light mode" on the ST2 to speed-up the speaker set switching (ST2 Setup menu, System status tab).


Although the Penta is the only TMC-1 system with inserts, room equalization may be added after the outputs on the other systems and switched using the same GPIO's.