I bought this to be used with a Riot 1100W Mono Amp, and I love how its bass sound. I used most for Rap and reggaeton music. It makes my mirrors shake but it cannot be heard from 25ft, which is good because I don’t want tickets haha.Really, this product is enough for my needs. If you are in a budget and you want more bass than a factory can produce. I recommend them, for the price, they are the best. They sell this on different stores more than $40