[MTCD Android Head Units General] typos1:
Anyone looking to improve the audio quality of their MTCD/E head unit has 5 options, each in their own thread scattered across 3 of the 4 MTCD forums, so I thought I d open one overarching thread for discussing and comparing all 5 options.

These mods apply to R3188/PX3 and RK3368/PX5 units, they should also work on Sofia units as well, but I dont recall reading that anyone has tried, theyll likely work on the new RK3369/Px6 hexacore units too, but again AFIAK no one has one yet.

1) The easiest and simplest way to improve sound quality is to flash one of [MENTION=9297693]cs-x(RU)[/MENTION]'s modified sound patched MCUs which give improved overall sound quality, just find one that matches you manufacturer and flash it, job done. No root required. Gives a small but useful improvement in sound quality. Thread here :

https://xdaforums.com/android-auto/...ent/mod-cs-x-mod-mtcd-e-mcu-firmware-t3816042

2) [MENTION=8817431]Wadzio[/MENTION] has cleverly managed to implement [MENTION=322215]7floor[/MENTION]'s hardware mod (see below) in software, all thats needed is to flash one of his MCUs and install a few apps. Root is only required if you want to replace the original amp app with [MENTION=8817431]Wadzio[/MENTION]'s - the original can be left installed for non root users. It doesnt work on all units yet as it requires the MCU to be modified quite heavily and [MENTION=8817431]Wadzio[/MENTION] cant spend all his time modded MCUs ! (he has released a guide on how to do it, though). It can be buggy on some units. Increases sound quality and enables much more control and more settings. Thread is here :

https://xdaforums.com/android-auto/mtcd-software-development/mod-bd375xx-sound-processor-t3834657

3) [MENTION=322215]7floor[/MENTION]'s sound mod - on units without a factory fitted upgraded DSP (ie most currently), the audio chip is controlled by the MCU, [MENTION=322215]7floor[/MENTION]'s mod involves disconnecting the MCU from the audio chip and connecting the audio chip directly to the SoM so Android control it, some basic soldering skills are required. Units must be rooted, installing an app is also required. It works on Lollipop and MM units but its not currently working on Oreo units as the system cannot find a small file, however I its a minor bug that I think could be fixed easily. The mod was originally developed for the related MTCB/C units which is why the original thread is in the MTCB forum. Increases sound quality and enables much more control and more settings. Threads here :

https://xdaforums.com/android-auto/.../mtc-sound-controlling-bd37xxx-sound-t3234660

https://xdaforums.com/android-auto/mtcd-hardware-development/7floor-sound-mod-mtcd-t3624035

4) [MENTION=9297693]cs-x(RU)[/MENTION] has managed to retro fit an upgraded DSP to the same spec as the new units with factory fitted upgraded DSPs and it uses existing apps which the unit will automatically use if it detects that a DSP is fitted to the motherboard, so units dont have to be rooted. This mod wont be for everybody as it involves buying a DSP board and a lot of soldering. Increases sound quality the most. Thread here :

https://xdaforums.com/android-auto/...nt/mod-simpledsp-installation-mtcd-e-t3823075

5) Buy a new unit with the upgraded DSP fitted at the factory. Thread here :

https://xdaforums.com/android-auto/...eneral/dsp-units-androidautoshop-com-t3803557