The leading product of WELL-SOUND COMPANY is EUCAP168 -- car hi-fi audio processor, the new revolution of car audio optimization equipment with high definition expansion, It has the follow functions;1. 4 Channel high level Input function. 2. 4 Channel + 2 super bass low level(RCA)Input function. 3. 4 Channel 7-Bands EQ with 24 Db control function. 4. Bypass function.5. SQP (Sound quality promote) technology enhances audio reproduction by overcoming vehicle acoustics, improving sound stage, tonal balance, and accuracy6. BP (Best position) for time correction7. 0 -180° Variable Subwoofer phases adjustment , 80 -320 Hz Variable Low-Pass filter with gain control 8. 4 Channel Electronic Crossover with gain control function. 9. 2-way / 3-way select function.10. Front, rear stage All Frequency (10Hz-20KHz) select function.11. MP3, MP4, IPOD and NAVIGATION Ready, Auto input signal sensing (two way I-AUX input)12. Front, rear 2-way / 3-way and super bass pre-amp output