Cant beat the price
Does wonderul eliminating high frequency bass

NONE

Could not beleive the difference this made, eliminated the high frequency bass that my amp was allowing through

Works great!! excellent product. Worth the 10 bucks just for the bass boost!!!

"You Get What You Pay For". In an attempt to cut costs, I purchased this useless crap. Yes, It does eliminate the frequencies you desire, but at a NOISY cost. My system was noise free until I connected Pyramid's product. The noise gets too loud to bare if you attempt to use the bass boost on any frequency. Just having the crossover connected will bring the quality of your system down. I'm not sure about their other products, but this one is trash.