Installed this on my bmw i4. Great quality sub. Easy install . Sounds way way better than stock . I can hear some bass in my system. I have the HK system in my car. Can't give this sub enough props!

For increasing base level

I paired these up with the JL Audio xd600/6 crossed at 120 hz and it is pure audio bliss. The bass is thick and rich. Is not club style throbbing bass for EDM, but for rock, funk, disco, soul, it is excellent— tight, articulate and powerful. Everybody who I demonstrate my car audio comments on how clear and tight it sounds and I get immense enjoyment from listening to it every day.The only thing to be aware of is that as other people have commented, you need to be prepared to creatively make the area on top of the subwoofer provide an inch or so more clearance for the subwoofer to move back-and-forth without hitting the grill. I accomplished this by putting a piece of wood as a spacer on the two sides of each subwoofer and then getting extra long 2 inch screws to screw the grill back in. It is completely not noticeable after closing everything up because this area ends up being entirely under the seat.

Purchased these to replace the under seat subwoofers in my BMW 550i. The description for these speakers is as follows:"Designed to replace the BMW factory speakers that are located under the front seats, the SWS-8X requires no modification. Simply remove the seats and replace the factory woofers with the exact-fitting SWS-8X woofers to improve the sound quality of your mobile audio." HAHAHAHAHA! Yeah, right! Installing these is a royal pain in the backside. With the existing contour of the enclosure, you need to remove all of the partitions to accommodate the depth of these speakers and that's still not enough. I added weather stripping around the lip to raise the speaker enough for installation, and as a preventive measure for rattling.Another pain is, which is not mentioned, you need to purchase a separate installation package is sold to wire them which involves cutting the existing connection off and installing spade connectors for attachment. I had good speaker wire and went to the local hardware store for the connectors and saved myself $40. The least they could do is include the spade connectors......Once installed, these speakers, paired with the Bimmertech PP82DS, perform well and provide the boost I was looking for.

I hate when companies don’t disclose full details. Amazon listen up. If you speakers and their install basically for a professional. Say so. Don’t make it seem like a drop in install. It not. They don’t even provide you with any spare wire. These will nut be plug and play speakers for your BMW. You will need wire. Connectors. Heat shrink to protect the connections you make to connect to your system. Then you will need to know how to figure out positive and negative wires or you could ruin the speakers your just bought. For the money your now maybe have to pay an installer. Could of bought BAvsound speakers which are plug and play