Pioneer DEQ-S1000A2 power amplifier (4-channel) with sound processor.

Pioneer DEQ-S1000A2 Universal Sound Processor. 
Connects to Apple iOS & Android devices, and utilises Pioneer's Sound Tune app, for set up and high quality audio features.

The DEQ-S1000A2 is Pioneer's Universal Sound Processor, designed for upgrading the sound quality of your factory vehicle stereo and speakers. Since the originally fitted stereo does not need to be replaced, installation* is simple. Due to it's compact size, it can be installed out of sight, adding to a cleaner installation.
The DEQ-S1000A2 incorporates Pioneer's full custom high performance 48-bit dual-core DSP for high quality premium sound reproduction. An internal clock and pattern are optimally tuned. Sound degradation from jitter noise is thoroughly eliminated.
When used along with Pioneer's Sound Tune app, you can bring high end audio to the basic factory speakers. All operations are performed easily through a compatible smartphone and a wide range of settings are accessible from live simulation settings to 31-band custom equaliser settings via the Sound Tune app.
The DEQ-S1000A2 features easier connectivity thanks to the included ISO T-Harness and OTG cables for Android smartphone users.
*Optional vehicle specific cables may be required, sold separately.