Any suggestions for aftermarket door speaker bass improvement?

CJnum6

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2015 CX-5 AWD Sport
So I finished up with my system install, no sub, but all door speakers replaced.
Pioneer AVH-X5600BHS
Polk Audio 4xdb651's

It sounds okay, but I can barely turn the bass up at all before it starts to hum or sound muffled(parts aren't rattling or anything). Tough to describe. It just sounds like there's too much space behind the speaker, and the door itself is adding to the bass.
Definitely to the point that I can't enjoy the music I want as much as I would like to.

I know there's been mention of the bass issues with the car, but has anyone found a good workaround to help the issue?
I like to listen to heavy music, so when it hits I want to feel it, but not have the bass take over the rest of the frequencies since the frame doesn't seem to take it well.
I'd prefer to avoid a sub which I know would relieve the issue since I could turn the door bass down at that point. Just don't want to spend that much more on it.

I'm not too experienced in this area so any suggestion would be awesome. I think I read dynamat wasn't a good workaround for this type of issue, but let me know if it helped for anyone.
 
Most cars have terrible acoustic qualities and will never sound that good. The doors of the CX-5 (and all modern cars) have structural side impact elements that can mess with speaker performance depending upon speaker placement. Let's face it, doors are not designed to be speaker enclosures. For a few thousand dollars you can take it to a specialist and it still won't sound as good as a comparatively cheap home system in a living room with average acoustics.

Quality ear speakers are your best bet for high quality sound but they may be illegal for the driver to use in your locale. Personally, I find the Bose system that came with the car to do a pretty good job with an accurate frequency response as long as it's not cranked to higher volume levels that make it difficult to talk anyway. It does seem that some people are not happy with a nice flat frequency response but want the bass frequencies amplified more. That is going to tax any in-door speaker that doesn't have it's own speaker enclosure.
 
Resolved!(mostly)

SO was searching google a bit with random sentences of what the issue was, and came across a forum where someone mentioned that EQ should only be used to LOWER the frequencies. Me being an amature of course did not know this, but decided to try it out. Turns out the overall system doesn't handle increasing the frequencies very well and starts to have crappy bass. In other words it WAS NOT the doors! Don't get me wrong, it's still not perfect or anything, but it's night and day from what it was.

With this now the typical volume from 0-40(max) is right in the middle at 20 while driving. Before I was sitting at 10-13ish

If anyone did not already know this try it out.
40Hz = -2 | 80Hz = 0 | 200Hz = +2 | 400Hz = -4 | 1kHz = -6 | 2.5kHz = -4 | 8kHz = -2 | 10kHz = -2


The bass hits hard enough to not need a sub, you can feel it, and it's still crisp and clean. Really low bass tones that are held do still have a semi muffled tone to them, but it's not even CLOSE to what it was. Barely noticeable.
 
often when speakers have a hum noise it is because they are not properly grounded. You should check it out first.
 
JL Audio ported microsub. It's small and doesn't require a huge amplifier and it really adds dimension to the music in the form of accurate deep clean bass. I have some Polk Audio DB series speakers and they aren't anything special.
 
In the beginning I had the Infinity Primus PR6500cs components and they had pretty good bass.
 
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