Review on 🔊 DS18 DBP-1 Digital Bass Reconstruction Processor - Enhance Lower Frequencies Across Various Music and Reproduction Formats, RED, One Size by Tony Chandler

Uses lm324 amplifier, not recommended for audio due to internal design. Claims in the manual "On-board 30 volt bipolar switching power supply" are not accurate, it uses a standard 12 volt voltage divider circuit. "out to 7 volts" in the manual specs and "5 volt RCA" on the box, this is not possible with 2x/6dB internal gain and a standard 2.1 volt RCA input. And a real flaw. There is NO amplification at the subwoofer output. In the manual it says that the subwoofer is only present on the rear output (fader I think, since only 1 input is active at a time) this is not true, the subwoofer is fed directly from the main volume via a low-pass filter. Subwoofer output filter. I noticed a strange popping noise when plugged in, not sure what the cause is, it's being investigated, but my money is on poor design. There is nothing to criticize about the gold-plated cinch connections. Mechanical build quality is solid, but the screw holes in the box's lid are so misaligned that the box warps 1/8 inch with the screws installed. Buy something else. It's just another paperweight.