That's the impression I get from mine, that it sounds more like a professional radio. I haven't really paid attention to whether or not it sounds "bassy" or "buckety", just noted that it sounds quite different from my 106. I'll have to pay more attention to see if it sounds like deep bass or talking in a bucket.I don't know if you're aware of it but these scanners are designed with much more professional sounding audio than in the past. People say it sounds almost like a Motorola professional PS radio.
People who have complained about it describe said audio as having much more bass in it. Sounding deeper than other scanners and also more muffled.
By your post I'm not sure if its that or something else or maybe a combination of things. If its just the improved audio I don't think Uniden will fix what is a definite improvement. Other things are a different matter. One thing noticed by DaveIN is a fix of changing the P25 threshhold level to about 5 to pick up systems better and clearer.