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Theory of Operation
General
This document refers to schematic revision 10.
The T1 ToneMatch
®
Audio Engine consists of a small, portable housing that contains Input and
Output (I/O) connectors on an I/O PCB, a main PCB with user controls and an LCD display, as
well as a removable top cover with storage for a mounting bracket.
The T1 is part of the second generation of the Personalized Amplifications System™ family of
products from Bose
®
. It’s designed to provide user interface, input / output capabilities and
extensive tone shaping capabilities through digital signal processing. It is housed a very small
portable enclosure that the musician can keep at the playing position.
The user interface of the T1 centers on the needs of the performing musician. Very important
tasks, like adjusting volume or muting, need to be implemented with as little disruption and
distraction to the player as possible. More advanced functions that are only adjusted between
songs or during rests can require a little more attention from the user.
The T1’s main use is with the L1 Model II powered speaker system, and provides seamless
integration between the two. Connection between the T1 and the L1 Model II is done with a
single cable that carries audio, communication and power, so that the T1 can operate without an
external power supply or AC connection. A separate, external wall-wart type power supply is
available as an option for those that desire it.
The T1 is designed for the needs of a single musician and not intended to be shared between
players
I/O Connectors
• ToneMatch port – Ethercon connector for digital audio output to the L1 Model II,
• bi-directional communication with the L1 during SW updates, and power input for the T1
• USB type B connector
• Three combo connectors: XLR/ ¼” for mic and line inputs (channels 1, 2 and 3)
• Two ¼” balanced analog line-level input jack (channels 4 and 5)
• Three ¼” balanced analog line level output jacks (preamp outputs, chs 1, 2 and 3)
• Two ¼” balanced analog line-level output jacks (Master and Auxiliary outputs)
Controls
• Power Switch - Switches the system on and off
• Trim - Adjusts the level of the analog input signal on channels 1, 2, 3 and 4/5
• Selector - controls LCD display and the function selected
• LCD - controls softkeys for the LCD display
• Channel Volume - channels 1, 2 ,3 and 4/5
• Master Volume - controls overall volume out of the T1
• CH(annel) Edit buttons (4) - select which channel’s settings are seen on the display
• FX (effects) Mute buttons (4) - select which channel’s effects are bypassed
• Mute buttons (4) - select which channels are muted
• Phantom button - turns the 48 VDC supply on channels 1, 2 and 3 on and off for condenser
microphones.
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