redbenjoe said:rest assured --that its not just your box --
the highs could be alot better --and the bass distorts too soon --
so....your box is normal for that series
The bass is mediocre because the speakers are serious. Serious lightweights, that is. installing heavier, more substantial woofers will improve the sound but the structural integrity of the boombox comes into question. The plastic shell is so thin that cracking during shipping becomes a real possibility. Like 50 eggs cracking at the same time! The plastic shell is very thin, almost black box thin. The saving grace is that Sharp tied the woofers together with a pair of brackets. Still, the front case flexs quite a bit without the back cover on. I'd be very scared of shipping one of these with beefier woofers.
As for the tweeters, Sharp did something weird here. They neutered good 2-1/4" +/- dome tweeters with a shroud that cuts the tweeter opening down to like a 1/2" tunnel or so. High frequencies are very sensitive to sonic interference so removing the shroud will improve the highs. I looked and there is no easy way to de-shroud the tweeters so the easiest solution is to swap the outer speakers with coaxials.