One of the other things I did recently was to take advantage of the EQ built in to the headunit. I'm not an audiophile by any means, but figured I might as well make it as decent as possible.
To do this on a budget I took advantage of a very nifty iOS app called HouseCurve, which comes with a profile that flattens out the microphone response and makes it suitable to measure a response curve.
I used HouseCurve to take several measurements and average them out:
Which gave me the default response of the system.
HouseCurve has a built in mechanism to EQ the system and generate PEQ values, however the EQ on the Xtrons is a 16 band fixed frequencies EQ, rather than full parametric, so I wasn't able to take advantage of that directly.
I could have adjusted each of the EQ bands manually to try and optimise, but I'd rather get the calculated optimum. So what I did was to export the measurements from HouseCurve and import them into REW which has a generic EQ which allows for specifying the fixed frequencies for each band. You can then optimise on just the Gain and Q values to the target curve you're seeking (I chose to use the AudioFrog curve).
This gave the following (blue = target curve, dark green = original curve, light green = optimised curve):
The graph of the filters looks like this:
I was then able to take the calculated Gain and Q values for each filter and set them in the EQ in the Xtrons:
And the difference is night and day. Sounds so, so much better, and such an easy thing to do to improve the end result!