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This pre-amp/variable low pass filter kit is simple enough to implement into a project and build quality is good. The filter's frequency roll off is not sharp enough in my opinion, to be relied upon if using an unfiltered L/R music or movie source (tested using unfiltered music via smartphone). Attempting to roll off at a lower frequency attenuates the desired range too much, resulting in insufficient signal over all. My AV receiver happens to provide programmable low pass frequency cut-off (40Hz to 200Hz) to it's sub-woofer phono output, so this filter is treated as an additional cascade within the signal path to the sub-woofer amplifier. I expected this as the probable outcome from a budget 2 stage op-amp design.
Verified purchase: Yes | Condition: New
Work as described. Good choice.
Verified purchase: Yes | Condition: New