T1 ToneMatch® Audio Engine power supply
From Bose L1 Encyclopedia FAQ & Wiki
This is the power supply for the T1 ToneMatch® Audio Engine. You will need this to power your T1 ToneMatch® Audio Engine when running with an L1® Classic, L1® Model I or if you have two T1®s running into a single L1® Model II — details below the picture.
If you connect your T1 ToneMatch® Audio Engine to a L1® Model II then the T1 ToneMatch® Audio Engine draws its power through the ToneMatch® cable. If you are attaching two T1 ToneMatch® Audio Engines to a single L1® Model II then you will need this power supply to support the second T1®.
See: Connecting Two T1®s to a Model II for details.

