Car Audio DSP Development

I'm seeking an experienced developer to build a digital signal processor (DSP) for my car audio setup. The DSP will integrate with both the head unit and amplifier.

Key Functions:
- Equalization
- Time Alignment
- Concert Hall Effect

Control Interface:
- Preferably a physical interface

Ideal Skills and Experience:
- Proficiency in designing and developing DSPs
- Experience with car audio systems, especially integration with amplifiers and head units
- Knowledge of audio processing techniques

Please provide examples of similar work. Looking forward to your bids!