GRACE DESIGN m908 Bass Management Rear Speakers User Guide
- June 1, 2024
- GRACE DESIGN
Table of Contents
TECHNICAL BULLETIN
PRODUCT: m908
ISSUE: Provide Bass Management to rear speakers with dedicated subwoofer
Date: 5/1/2024
Questions? service@gracedesign.com
303-823-8100 x 105
The m908 contains a powerful bass management system but it is unable to route Low Pass signals to additional arbitrary subwoofers. However, for immersive studios using an m908 that need a separate bass management system just for the Back speakers, the method described in this document can now be used.
The limitations of this method are:
- There is one Low Pass output from each speaker that will need to be summed together. This can’t be done in the m908, so an external summing method is required.
- The Low Pass outputs will remain active when the m908 Bass Management system is turned off. However, they can be muted with the solo/mute system.
Setup Workflow:
1. Make a backup copy of your current workflow
2. Go to Setup > Workflow. Edit the workflow to add the following speakers
(1) Left Height Back
(2) Right Height Back
3. If there are no available DSP channels then remove one CUE to free up 2
channels.
4. Save the workflow.
Setup Input Routing
5. Go to Setup > Inputs. Edit any input that uses the Left Back and Right Back speakers by adding an additional route from the input Connector and Channel being used to the Left Height Back and Right Height Back respectively.
Setup Speakers
6. Go to Setup > CR / Speaker. Select the Speaker system that uses the Back
speakers.
(1) Click on the Left Back speaker and set the LPF Slope to “none” and the HPF
Slope to the desired crossover slope. Set the crossover to the desired
frequency.
(2) Click on the Left Height Back speaker and set the LPF Slope to “none” and
the HPF Slope to “bypass”
(3) Set two room EQ bands to “low pass” and set the frequency to match the HPF
speakers.
(4) Repeat for the Right speakers.
7. The outputs from the Height Low Pass speakers can then be connected to a sub-woofer. If the sub does not have Left and Right inputs then a passive summing network can be fitted inside and XLR connector to sum the left and right together.
Rev.
| Description| Date| Initials
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A| Initial release| 5/1/2024|
MBG
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