Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: What's that little button in the middle of the speaker and does it mean anything?
Document: Great clear sound..Do take a little breaking in but sound better and better the more you play! Tweeter level button is a nice feature as they can be a little bright on some music. Overall a great buy and a solid speaker.
Thought these speakers weren't going to be all that great, bought them to test them, and I haven't regretted anything about them. They sound phenomenal! Whether you are improving a home stereo system with some loud car speakers, or adding it to your car, these are the correct choice. I would definitely buy again. The only downfall I see with them would be the treble gets too high when turned up really loud (and I mean REALLY loud). Other than that, they are outstanding. I will definitely be upgrading to these for car door speakers as well.
Bought these to replace factory BOSE system in my '06 Impala SS. Not the easiest install because of the BOSE amplifier and the way it is wired, but well worth the time spent. I have never been a personal fan of BOSE anything because of the large amount of signal processing they use. The system sounded like you were in a tin can. These speakers are extremely clean with very detailed bass, strong clear mids and highs that you can attenuate with a button on the tweeter array. (Be sure to play your system and see if this is something you want to use before putting car back together because you may not have access to the button in all applications afterward.)
These have a push button to enhance your tweeter which is really neat because you can definitely tell an audible difference. These speakers can also take a punch, I had these hooked up to a didicated channel on a Sony 1K watt amp and accidentally had the low pass filter on, meaning everything below 80hz was sent to the speakers. Luckily the head unit was not turned up too much. These JBL's handled that little mistake with no problem. most other speakers would still be smoking! These JBL have become my all-time favorite speakers.
These speakers was a little weak on the base until I installed the upgraded stereo on my sons Mazda and then it was like a whole new speaker. These speakers sound really good and the put out some deep base. I have these with the 6X8 JBL GTO8628 in the doors and with these two together, no sub is needed....the rock hard. This was a great combo for hip hop and rap and it sounds great for everything else due to the nice high and mids.
My truck's amp only sends mid bass and lows to these speakers and they definitely perform. For the price I couldn't have asked for better. They have a little thump in them, so much so that I had to dynamat my doors as they were rattling a bit!Buy them, you won't regret JBL qualitySIDE NOTE:I wish speaker manufacturers would protected the speaker material around the screw holes, you always have to put something beneath the screw so that it doesn't grab the material and rip the speaker edge :(.
I do not even have these hooked up to an amp yet and I am still using the factory head unit, but they are fantastic. Technically speaking, these are rated for 2 ohms which means they can do more with less wattage. However, they are rated at 100w RMS which means you can gain even better sound at higher volumes with an amp.A few recommendations if you decide on these. Buy an amp that will get you at least 80 watts RMS to each speaker. Though a little more wattage is even better.
I purchased these to replace a pair of Infinity Reference 3 way 6x9 that is blown. After much review and a few sites labeling this speaker as their top choice in it's class, I decided to go with these rather than the Infinity Reference. I got them in and match them to the Infinity and although this is a great sounding speaker with very little to no distortion at high volumes, it did not outperform the Infinity Reference. Very different sounding speakers, played a little deeper sounding bass but not as accurate across all the bass notes.
These have sufficient bass while amplified, super crisp highs and surprisingly rich mids. I'd pay 150$ for these and be happy.ProsJBL's 6 x 9 is the best sounding car speaker I have reviewed.ConsThe frequency response range could use a small improvement,a little more mids, and not louder but deeper lows. .The Verdict: 9.75/10 Excellent sound quality, sensitivity and power handling make the JBL GTO938s  the most impressive car speakers I reviewed. These blow me away. ( I work at a audio install place and test/ rate/price our speakers.
More than a normal 6x9. After a week, they are starting to shake loose. That's how mean these things are.Great buy. Don't pass this up if you're looking for 6x9 speakers.
Answer: Adds or takes away highs + - 3db