Polk AudioDB651 6.5"/6.75" 2-Way Marine Certified db Series Car Speakers with Liquid Cooled Silk Tweeters (Discontinued by Manufacturer),silver/black

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I’m really liking these speakers. I replaced the 4 old Sony speakers in my boat and what a difference. Sound is so much more clear and more bass. I’d definitely recommend these to anyone looking to upgrade older speakers.

Best product, sound quality is awesome, better than I expected, so is the price, I got it for only about 35K. The quality of this product is too good that I even remove my car original speaker and change it to this speaker. Arigato!

My 2000 Jeep Wrangler Sahara had a Sony MEX-BT3800U head unit that the previous owner installed. He had a custom dual sub-woofer in the back but removed it and left the wiring when I bought it in 2012. Recently the TJ has become my daily driver so I decided to upgrade the sound system. With a convertible option on the Jeep, I decided Marine Grade was called for.All 4 factory speakers are easily replaced without major surgery. I got Polk dB461's for the front and dB651's for the sound bar in the back. They were a direct retrofit installed in about an hour. Great sound from the Polks. Bright and clear speakers that I'm really happy with. With the loudness on, the 651's in particular had pretty good bass but it still needed that fullness only a sub-woofer could provide. The front dB461 speakers of course, don't have the bass of the 651 but for the frequency range it does carry, it's still a great speaker. Make sure you get the adapter plate for the Jeep since the front speaker mounting screws are in the center.With both Polk's I still wanted to "feel" the lows. With the wiring already in place, I considered building my own sub-woofer with a matching Polk 8 or 10" sub driver. Researching cabinets and amps, I realized loss of storage space and potential theft were significant considerations. I also don't need to vibrate the license plate. Just fill the sound band.A compact self powered sub is all I really needed. The PWE-S8 rose to the top of the choices. As it turns out, it fits invisibly under the back seat. I'm still tuning it but so far, the TJ sound is amazing over a wide range of music. I can literally feel the low keys resonate from piano and bass guitar passages. With adjustment capability at the head unit, I am able to experiment to find the sweet spot between sub and mains. The bass source location from the Alpine is invisible to the ear. It's all over the car. Exactly what I was looking for.A special note on installation and Alpine Tech Support in particular-Make sure your electrical connections are done right. I made my own ground connection on the rear seat bracket with a solid self tapping screw. Sanded the surface down to bare metal. The guys at Best Buy helped me properly run the red hot wire directly from the battery along the passenger side to the back. (The head unit wires run along the driver side. This separation eliminated any chance of interference and noise.) Then we connected to the remote-on wire (blue/white) of the head unit, plugged in the RCA connections and voila...NOTHING! No power light. We fiddled with it for about a half hour before the BB guys determined it must be the PWE-S8. I got the exchange unit from Amazon the next day thinking it will be a plug and play swap. This one didn't work either! that's when I called Alpine support and they walked me through some tests with a multi-meter. The guy emphatically said it's got to be my connection. Even though I was getting 12 volts, it dropped to 9 when the amp was under load. I know the hot was good because I saw it installed. This lead me back to the ground connection. I removed the seat bracket (2 big torx screws) and found paint on paint at the mounting point there. I sanded that down to bare metal on both surfaces, bolted it all back together and now, for real, VOILA! It worked beautifully.Self inflicted pain made a pretty straightforward installation a frustrating experience but I got it done. The Alpine PWE-S8 was the finishing touch on a great upgrade. My 2-3 hours in the Jeep in commute traffic is a lot better now.Cheers!

Purchased to replace cheap 5.25" speakers in our RV. Great sound, even with the stock Jensen stereo - a huge improvement! Lacks a little bit of bass, but that's most likely our stereo - we'll replace that at some point.