2023 Tacoma
Model-QCM6125
Build#-13S10A_123 eng.hct.20260410.140423 NA-V2.1
MCU version-MTCHS_HA4Z_V4.17f_1
Low output out of optical and RCS outputs- wanting to update or downgrade to gain this funtionallity.
Could you please confirm whether you have installed an aftermarket amplifier with the head unit?
If yes, please let us know:
*The brand and model of the amplifier
*Whether it is an active/powered amplifier or a passive setup requiring external amplification
*Whether you are using the RCA outputs, optical output, or both
This information will help us determine whether the low output is related to the head unit settings, firmware, or the amplifier setup.
We are running the optical output to a aftermarket DSP processor (JL audio TWK 88). We tested the signal with an audio measurment system and found it to be unstable and have substantial disortion over volume 20. Older versions of this firmware in systems we have installed in other vehicles with this head unit did not have this issue. We tested the amplifier in the headunit and it is funtioning as expected on the speaker outputs but they will not be used.
@Support Dasaita We are running the optical output to a aftermarket DSP processor (JL audio TWK 88). We tested the signal with an audio measurment system and found it to be unstable and have substantial disortion over volume 20. Older versions of this firmware in systems we have installed in other vehicles with this head unit did not have this issue. We tested the amplifier in the headunit and it is funtioning as expected on the speaker outputs but they will not be used.
@Support Dasaita will you please provide an update on this?
@Brian B
Thank you for the detailed information and for testing the optical output with your audio measurement system.
Could you please provide us with your **current firmware version information**? You can send us a photo of the **Settings → About** page showing the Build Number/MCU version.
Since you mentioned that older firmware versions on other units did not have this optical output distortion issue, if possible, could you also provide the **firmware version/build information from one of those units**?
We can then forward both versions and your test results to our technical team for comparison and further testing.
