(2017 CX5) Does changing only speakers improve sound quality much?

I’ve just got 2017 CX5 (KG) with 6 speakers configuration. The sound from speakers is quite flat (and total quality is quite bad).

I don’t know if the sound is bad because of the speakers or the head unit.

Has anyone changed only speakers without additional dap, amp, etc? Does the sound quality improve much?

I’m quite new to car stereo upgrade. Many stores offer me dsp (which they claim to improve much quality) but I don’t know if using dsp+cheaper speakers or just more expensive speakers will make better result?
 
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Pueblo county CO
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CX-5 Sport 16.5 6M
New mids and tweeters for dash helped mine, but I'm not sure exactly what speakers yours has.
 
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South Carolina
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12 MZ5 13 CX-5
For starters, I'm big into music. I'm willing to go to great lengths to get terrific sound, way more than most other people. Ripping out the entire interior to apply sound deadening is a no-brainer for me.

Now that that's our of the way, I've yet to hear a factory stereo, no matter the manufacturer, that doesn't sound like ass. (I've not heard the $20,0000 Bowers and Wilkins option that's in some Maserati's though, so my opinion on that setup is reserved!)

Even the otherwise "vaunted" Bose stereo upgrade that our Mazdas have sound like crap to me.

So yes, to me at least, even minor speaker upgrades make a huge difference in sound quality.

Here are the physical differences in drivers of even modest, and I really do mean modest, upgrades in both my CX-5 and my wife's Mazda5 from factory to aftermarket.
 

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CX-5 AWD, 2017
My 2017 CX5 also had 6 speakers. It sounded terrible. I changed all six of them with "Hertz" high dB speakers i.e. four 6,5 inch /165 mm coaxial door speakers with orange magnate cover and two Hertz tweeters. The sound improved dramatically. Wider frequency range, clear treble and deeper base. Not the teenager car shaking base but nice, tight and controlled. It sounds closer to my home stereo with good relaxing sound. I have written a DIY here in this forum somewhere.
 
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2019 CX-5 GTR
... I have written a DIY here in this forum somewhere.

I found the post where you mention doing the upgrade:

participated heavily in this discussion:

and this one:

I didnt see anything in the resources:

still havent found the DIY thread / post.
 
New mids and tweeters for dash helped mine, but I'm not sure exactly what speakers yours has.
Mine are factory speakers but I plan to change to German Maestro AS/AC6511 or CS/CC6508 (I think they are not officially available in the US)

For starters, I'm big into music. I'm willing to go to great lengths to get terrific sound, way more than most other people. Ripping out the entire interior to apply sound deadening is a no-brainer for me.

Now that that's our of the way, I've yet to hear a factory stereo, no matter the manufacturer, that doesn't sound like ass. (I've not heard the $20,0000 Bowers and Wilkins option that's in some Maserati's though, so my opinion on that setup is reserved!)

Even the otherwise "vaunted" Bose stereo upgrade that our Mazdas have sound like crap to me.

So yes, to me at least, even minor speaker upgrades make a huge difference in sound quality.

Here are the physical differences in drivers of even modest, and I really do mean modest, upgrades in both my CX-5 and my wife's Mazda5 from factory to aftermarket.
In your op, If you have limited budget around 1.5k usd for the upgrade, will you choose DSP+ cheaper speakers or just some higher quality speakers? (I'm not in the US so my range of selections will be different from yours. However, I'm deciding between Alpine R500 DSP+German Maestro AS/AC6511+local brand spare tire subwoofer OR German Maestro CS/CC6508+local brand spare tire subwoofer, which are at the same price)
 
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South Carolina
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12 MZ5 13 CX-5
German Maestro makes AMAZING speakers! Absolutely fantastic, great choice!

As far as what I would do, I'd forgo the sub for now, and concentrate on the better speakers plus a DSP. You can always add a sub later, as that's an easy upgrade.

Even if the better line of speakers plus DSP comes out above your budget, just drop down an notch on the DSP. MiniDSP and Dayton Audio both make a more affordable model than the Alpine, as does AudioControl. But like you said, not sure about the availability where you are, but it can't hurt to ask.
 
I sound deadened the doors and added Hertz 2-way speakers and disabled the stock tweeters. It sounds way better. The stock HU is really clean. I'll probably eventually install an amp and DSP as the mids are a little bit harsh from the TAU, and will replace the tweeters. I also added an underseat sub that makes everything sound full now.
 
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'16.5 CX-5 AWD
The short answer is, yes! The Blose system in my '16.5, .... well, blose. Unbelievably, it sounds MUCH better than my '15.

First, a sound system that is "flat" is excellent, perfect. No note is exaggerated over the others or more than what was recorded. "Flat" is that unattainable Holy Grail.

I changed the dash twatters in my car and by setting the bass control to minus 6 and the treble to 0, I get a verified flat response curve, +/- 4 or 5 dB from 40 to about 15k. Remarkable. It is a pleasure to listen to it, relaxing, even. One of the threads in Infotainment includes the details.

I can't imagine the 2017, can't be easily improved as much.