CPJ D-AMP 90-4.1 is a 5 channel audio amplifier including 4 channel and 1 subwoofer channel.
This amplifier can drive speakers as low as 4 Ω.
Related product : CPJ MIX

Feature of CPJ D-AMP 90-4.1
– Very high efficiency(90%) by Class-D amplifier
– Low heat emission
– Low power consumption
– Small size but powerful sound
– Suitable for car audio system and PC
– 12V powered
– Channel 1~4 : 15W(4 Ω~)
– Subwoofer : 30W (4 Ω~)
– Dimensions (WxLxH) : 188 x 94 x 43mm

User Guide
https://www.exinterface.com/d/man/cpj_damp_90_41/CPJ_D-AMP_90-4.1_useguide_eng.pdf