Good day Kannan,Some of the finest DSPs you will find are 12 volt ones made for car. Very advanced with floating point processing and very good quality DACs.
I place these leagues ahead of miniDSP.
Some options:
Helix:
https://www.audiotec-fischer.de/en/helix/processors/
https://www.audiotec-fischer.de/en/brax/processors/
Audison:
https://www.audison.eu/product_lines/bit/
Mosconi:
https://mosconi-system.it/1549-2/
Dayton Audio DSP: Comes with 12 volt adapter for powering at home.
https://www.daytonaudio.com/product...gital-signal-processor-for-home-and-car-audio
Some of the audiophile grade car audio active head units if you are lucky to find are
Clarion HXD2 (4-way active), Pioneer P99RS (4 way active), Eclipse CD7200 mkii (3-way active)
Pioneer P80RS (3-way active)
Kenwood has 3-way active head units in their current line-up which you check on their website,
Myself own a Creta 2017 model and the audio is not upto my satisfaction. Its not clear n detailed but instead have high bass n disturbing. I dont want to change many including the HU, Speakers but instead feel adding a good DSP like Dayton 408 would improve the audio quality to my satisfaction. Kindly advice. Thanks.