Infinity DSP DSP4425 Amplifier 4-channel Class A/B Amplifier Design, with 2-channel pre-amp outputs & Digital Signal Processing. RMS Power Output @ 4Ω 25W x 4, <10% THD+N. Infinity DSP Amplifier has everything you need to create a professional sound quality audio system with the ability to mount your amplifier in tight spaces.
eBay