Rackeys subwoofer Filter Board with inbuilt Phase Inversion Switch.

Thanks to Amazon for this super bass filter, if woofer and amplifier properly matched it's best in market. Can compete any good subwoofer. I am using Samsung subwoofer with TPA3116D2 class D amplifier weigh is only 50 watt RMS at 4 ohms woofer with 13 volt supply in car. And it's thumping at phase reverse mode. Simply awesome.

This is not a good working in the weight working very bad working

Some hiss audible. Can be controlled by 220pF accross the output leads. No hum noticed when used with a good regulated power supply. Dynamic range or headroom is bit on lower side. Input level needs to carefully adjusted. Any peaks in signal will lead to clipping noise. Rest is all good.

Good sound but high price

May be I got the defective product??On the basis I tested the particular board I got. These are the pros n cons as belowPros:1.The board is very small that's nice2.Easy to fit anywhere inside the amp boxCons:1.bass is good but useless because of unnecessary humming noies.2.design should be better, wire connectors should be there back or side of the board so that the phase switch and gain control from out side of the box3. Filtering is not proper, creating noise, body touch noies4. There is no difference in phase shift switching mode.

First of all amazing packaging,very easy to setup becsuse of onboard connectors and jumpers , increased bass output 3 times but should only be used if you need increased input signal to your amp otherwise your amp can overheat and may produce distorted sound so be carefull on where to use it or if you really need it at all

Only boom sound for 4440ic board... I RECOMMEND TPA3116 D2 SUBWOOFER AMPLIFIER BOARD

Loved it. Perfect low pass filter. Little hum noice when in mute and not because of the product but because of Amp.I wish you guys develop home theater board. I will buy it.