"Sound quality and fit are great." This is the one for BMW.

This is a processor amplifier compatible with the BMW RAM Module in the trunk of i-Drive7 from 2019 onwards.

The heart of SP processing is equipped with a 64-bit processor manufactured by Analog Devices with a clock frequency of 295 MHz, and the internal sample rate operates at 48 kHz/24 Bit.
Equipped with a high-quality Burr-Brown 24-bit A/D/D/A converter and a high-quality operational amplifier, achieving a harmonic distortion rate of 0.03% or less and an S/N ratio of 105dB or more.

Equipped with 1ch pre-out, it is also possible to connect a separately available power amplifier, etc.
It also achieves high quality sound reproduction with a damping factor of 100 or more.