T1 ToneMatch® Audio Engine / Digital Delay for Second L1®

DO NOT EDIT THIS PAGE This page is preliminary and being reviewed by the people-at-Bose The original discussion that led to this page is 2 Model II and 1 T1™

Here are some notes on how to use your T1™ to drive a main L1™ at the front of the house and a second L1™ farther back. The goal is to provide sound in a long room, in this case approximately 50 feet wide by 250 feet long. The room may be three quarters full or we may need only provide coverage out to about 200 feet.

Terms

• Main L1™ is the one at the front of the house centered on the 50 foot wall.
• Secondary L1™ is the one farther back, approximately 100-125 feet down the long wall.

Connections

T1™ Inputs

•   1  Microphone
•   2 Microphone / Instrument or Mixer
•   3 Used for Digital Delay processing
• 4/5 USB input from Computer

T1™ Outputs

• Tonemate™ (Ethercon Connection) goes to the Main L1™.
• Main ¼ inch output goes to Channel 3 input.
• Aux ¼ inch output goes to Secondary L1™ Analog Input

Turn down the Master Volume while making the following connections

Ordinary connections

Connect inputs for Channels 1, 2 and 4/5 in any way you like. Ensure that the setting for Aux is Mute for all.

Channel 3 - Used as Delay Channel

We are using Channel 3 to process to create a delayed version of the Main output, and direct it to the Aux output and from there to the Secondary L1™

Turn level down, Ch 3 Mute

We are setting the Level to zero and we will not change this while using Channel 3 for Digital Delay processing. We are setting the Mute as an additional precaution.

Settings for Channel 3

• Turn on Channel 3 CH Edit
• Turn the main Selector to Digital Delay

Digital Delay – Mix and Time

Set the Mix to 100%. This way we are outputting the delayed signal only.

We are setting the Time to 100ms to start. We will fine tune the time setting by ear later.

Digital Delay – Fdbk (feedback)

• Press the third button to switch from Time to Fdbck.
• Rotate the button to set the Fdbk to 0%. We only want to hear the delayed signal once.

Channel 3 Aux

• While still working with the CH 3 Edit lit turn the main selector to Aux.
• Set the Level to 100% so we send the full signal to the Aux output.

Aux – Tap Setting

• Press the Tap (middle) button, then turn set it to Pre: With EQ & FX then press it to select your choice.

Main Out (¼ inch) to Channel 3 Input

Run a short 1/4 inch patch cord from the analog Main Out to Channel 3 input.

Summary

The result of all these settings is the analog Main output is flowing through to Channel 3. Channel 3 is delayed 100ms once. The delayed signal is routed to Aux. The original signal is discarded, but that's okay because the original sources are still flowing through to the Main output through the ToneMatch™ port.

Fine Tuning the Delay Time

Tech Note: Distance in feet x .91 milliseconds = delay in milliseconds

Working on the assumption that the second L1™ is approximately 110 feet, the delay would be 100 milliseconds. We just used 100 as a preliminary setting.

Put the second L1™ approximately halfway down the area to be covered by your two L1&trades;. Aim it away from the main &L1™. We want to avoid overlapping the sound fields of the the two L1™s.

Turn up the T1™ Master level and you should hear your inputs through the Main L1™. Turn up the Secondary L1&trade Analog Input until you can hear both L1™s.

Have someone stand close to the second L1™. This is your 'listener'.

Use a child's "clicker" or something that produces a sharp, short clicking sound to send a "click" through a microphone into the T1™

Edit Channel 3, Digital Delay Time setting. Adjust the time until the listener hears only one click instead of two. The means that you have synchronized the sound from both L1™s for people who are in the overlap area of the two sound fields.