UBoom X - 1st corrections WIP (Patreon)

I spent some days tweaking my settings for the upcoming custom firmware and noticed that recent units definitely differ from my original unit that was used for the initial tuning.

Below you can see a measurement (with indoor) done from listening position like shown in the photo and averaged over a broader listening window. In black my original unit and in red a recent unit I just bought. Also my other 2 units I got after production started sound more or less like the current unit.

You can see that there is a bigger drop between 2-4khz with a higher raise towards 5khz than on my original unit, which makes the result of my initial tuning sound a bit off. I managed to correct this somehow and flatten this area out better, but it’s quite tricky because this range is continuously changing depending on listening distance and angle.That’s why my original tuning had a slight drop here as well because otherwise this range may became too pronounced when listened off axis. Below a measurement with the corrected response in black.

I had already shot a short video showing the result but actually I was not satisfied and started a new approach with different filters which should give an even smoother sound. I will nevertheless post this video for the higher tiers but will shoot a new one once I am satisfied.

Like mentioned this area is prone to permanent change, I am not sure if it is because of the crossover or weak acoustic design but it may measure different in other rooms and positions therefore it’s important to correct for the crucial frequencies which may become dominant from various positions and not just for some single measurement. Even though my latest setting may measure similarly to the one shown here at this particular position it may still sound different as I am correcting with different filters now. It takes some time to get really convincing results therefore I will spend more hours to listen carefully. Below you can see the corrected response compared to the go+play 3 in blue.

Biggest difference is more bass boost for the Harman Kardon and slightly less upper treble which would change when measured more aligned with the tweeters. The Copenhagen 2.0 which you can see in green below measures really weird with some strong drop towards treble and stronger emphasis of mids. I will post a new video as soon as I have some satisfying results, I just need to do more tests. So stay tuned for more…