First off I need to say that I installed these in my stock BMW. BMW uses a very low powered amp and loud tweeters. I could never really hear any difference with these Polk speakers. I believe that they would be excellent had I hooked them to an amp and disconnected the stock BMW tweeters.

Got a pair about a week ago. Haven't hooked them up yet but just the look and feel of them make me think that they are very durable and will sound fantastic. I will repost when i install and hear them.

While these 5.25" speakers do sound great, I mean really good for their size, the 6.5" sound twice as good if not more. I am running 4 of these 5.25" and 2x 6.5", and a 12" MTX sub, powered by a 6 channel MBQuart amp. The 6.5" are what make this system and if I was just running 4 of them, it would sound much better than the 4 x 5.25" and 2 x 6.5". They are much louder, have mid range base, and just a cleaner sound. If all you can fit are these 5.25" then go for them, they do sound great and are only beat by JLAudio of the same size. These POLKS are amazing speakers.

i bought these as replacement speakers for my TJ and could not b happier. Hooked them up to a small amp, and the sound couldnt be better for the price. and being that they are marine grade, a little splash from the hose every now and then after a little play time, wont hurt either.

Awesome speakers. They are only 2 way so you need more to fill out a complete system. But great power with a 45w rms per channel amp. Never ran it without an amp. But sounds great.

These speakers have the ability to be loud especially given the right amount of power. I have used these polk speakers in several applications (coolers, golf carts, my truck) and I have been very pleased with them. The highs can be very harsh at times, lows are ok depending on application (work great in coolers, lacked a little with golf cart baffles). Inside the truck they are okay. Definitely an improvement from stock speakers no doubt. But for the added edge I would definetly pair them with a sub of some sort. Only downfall is the mid-range. Polk could have done better in this category. Im sure if I had an aftermarket head unit I could adjust it better for a better review.

These are one of the best speakers you can buy without getting into components or needing to run an amp to them to make them loud. They are very crisp and have no distortion when the music is up louder. I would definitely buy these speakers again.

Sounds Amazing and works great!

I recently changed out the sound system on my 08 Harley Ultra Classic. I put in a set of the Polk db5251 components in my fairing. They sounded so clear I just knew I needed to get a set of these for my rear speaker pods. Installation was a little tricky. Thanks to Sonix and their line of spacers I got them to mount. The db521 are powered from the factory radio and the db5251's plus my Polk MM DVC 8 inch sub are being run off a rockford fosgate pbr300x4 amp. These polk speakers and subs not only surpass the Hog Tunes speakers I had they are so much clearer and put out more volume and the suckers are not even broke in yet. I now have a sound system that handles it all. Thanks again Sonix and their staff for helping me with sane pricing and great shipping.

Got these speakers to replace stock kia speakers. Ended up keeping the stock speakers because these ones have terrible bass output. They were great for full range, almost making music sound 'live' - everything was good but the bass, so they had to go.

Plain and simple. Just a great speaker. I used them on my motorcycle fairing. I used 4 speakers with a jvc power unit cd player and being they are marine grade i don't worry about the rain.

Installation was easy. I do NOT recommend. The speakers did not last 3 months. I don't listen to loud music but need to hear the speakers when I have the top off my Jeep. They did't sound much better than the factory speakers and one doesn't even work now.

I got these for my freightliner rig, man, these are very good!! Had to amped them.

I put these on my Harley and theysound great even at highway speeds

I am running these with a Sony CDX M60UI, a pair of db651s and a Bazooka 8" passive sub. The sound is wonderful. Very crisp highs and soft lows. I have heard that they sound even better with an amp. Not much room in my little boat to mount an amp, but these sound so good, I really don't need one. With a 93dB sensitivity rating, a few watts will give you great sound. I would recommend these to anyone.

Looks and sounds great on my motorcycle

I installed these in the back of my "05 Scion xB. They installed with no problems with the aid of a Scosche adapter. I have each speaker amped with 25 rms watts. I have the high pass filter on and they sound real well. The highs are clear and the mids are not "muddy". A good value for the money.

I would highly recommend these speakers to anyone where wet or damp conditions could occur and to anyone who just likes a high quality and great sounding speaker!

I was skeptical of these speakers at first because I really wanted the Polk component's, but i have not been disappointed by them. I have an MTX 704x pushing them and they've held up really well. The highs are clean and crisp and almost never too bright. It helps to be able to aim the tweeter so you can guide the sound to the driver seat. I've had them for about a year now and they sound as good as the day i pulled them out of the box.

These are all around good quality speakers. You won't be disappointed with these as replacement speakers.

I purchased a new set of 4 of the 5 1/4 polk audio speakers and put them in my pontoon. The sound quality is great. I am running them off of the head unit which came with my pontoon, I am sure that they would sound even better if they were either running off of a good head unit or if amplified. I am very happy with these speakers. They sound 10 times better than the originals. Great buy!

This Polk speaker has a nice clean sound. For its size its is has a well balanced range. Even the bass is not that bad. If your looking for a 5 inch speaker at a reasonable price this is the one to get.

I mounted these in a fiberglass kick panel modified for a 1970 VW speaker. These sound and look great in da bug!!! Going to get the Polk 6x9 equivalent for the rears.. The covers will match...

I have had two pairs of these speakers hooked up in my truck for about 2 months now and they're still goin just as strong as they were the day i bought them. They have extremely good quality and they also hit pretty decent for little component speakers.

Ive heard good things about Polk Audio but i was a little disappointed.
I have these in a '90 full size Blazer that came with no speakers so i had to mount them in the kick panels by my feet in the front. The highs and mids sound amazing very clear, i have never heard any distortion form them. The lows don't work very well you can turn the bass up but nothing happens the woofer moves but i cant hear the bass. Its a good thing i bought these with a sub. I would recommend these to someone who was buying them that has a sub to take care of the bass and a head unit that has a high/low freq adjustment not to some one who is looking to change factory speakers

Pros: They look great and the highs and mids are amazing

Cons: Don't expect great bass sounds

these are awesome, they are great no distortion, handle the bass from the the headunit power, if you amp them i recommend bassblockers though, mine didnt distort but at high volume in my blazer its so loud you probably couldnt tell. great SQ and very nice vocals! good buy!

I got these speakers right after Christmas for my jeep wrangler and i absolutely love them!! I am an avid off-roader and I really needed a speaker that could keep up with my lifestyle and these definitely came through! For a set of 5.25's these are LOUD!!! Not to mention incredibly clear!!

One speaker blew out in two months of little use at low power. Not happy with these.