Yeah, I think I only spent $109 on my Rikon sander. It looks pretty much exactly the same as nearly every other brand of the same general type and design. So they all undoubtedly come out of generally the same assembly lines, or at least, many of the major parts do.
There was one video in particular that I was watching recently, that had a sander that sounded nearly silent. I need to find it again and figure out what brand it was...maybe I can find one of those. I also dont knwo if there is some way to tune the Rikon I have to be quieter. It is SO loud...grating, grinding, rattling...it just doesn't sound good in any way. I've looked at it before, and couldn't find anything wrong, but, that doesn't mean there isn't.
Ok. After writing this, the fact solidified in my head that there WAS something WRONG with my disc/belt sander. So I went out and started poking around it again. I checked everything, and finally came across this panel on the back that I couldn't get open. Recalling, I was never able to get it open the last time I went poking around, so I tried harder. I eventually picked up some penetrating oil, doused this one screw with that a couple of times, and after letting it sit for a while, and a couple of solid tunks on it with a punch and a hammer, the screw finally broke loose.
Well, lo and behold, it was the belt compartment. The belt was completely loose. How this thing ever worked with the belt as loose as it was, is beyond me. Three screws held this compartment in place, and it took more pentrating oil and some even harder tunks with the punch and hammer to break those loose. Once I finally did, I was able to tighten up the belt nicely.
I took the sanding belt off while doing this, and when I first turned it on after tightening the belt, the thing was SIGNIFICANTLY quieter. Put the sanding belt back on, and its a little louder, but the grating, grinding, knocking, banging sounds I used to get are gone.
Interestingly, I've used several other Rikon disk/belt sanders like this, both 4x36 and 4x48, and all of them were loud, grating, grinding. Two of them were at the woodcraft near me. SO, I'll adjust my recommendation a bit here. IF you DO get a Rikon belt sander...take that darn plate off the belt compartment, and make sure the belt is sufficiently tight!! It seems they may ship with loose belts.