From my experience with internal filters like that, I find them just as noisy as the standard off-the-back Aqua Flow filters. Usually they start off good, and then as time goes on they either deteriorate or loosen up, magnets become weaker, etc.. I feel your pain though, I have a sump for my 155 gallon that's on the outer wall of my room- so as quiet as my lotl tank is I always hear the humming hahah.
If you clean it out and put everything back together like Kaysie and Neeka suggested and it's still loud as hell- Eheim's internal filters are seriously wicked and I would 100% recommend them ;
EHEIM miniUP . I have a Tetra Whisper for a 15-20 gallon on my tank that I also find to be incredibly quiet- but I know they're not the best quality for longevity and such- and that was a Walmart purchase for $20 CAD.
Depending on what kind of filter you have right now and what you end up getting- If you're going from a powerfilter to another power filter, you may have the privilege of having similar sponge sizes/cartridge sizes that you can simply move your media from your old filter into the new one. Your best bet if you end up going from a power filter to an internal like the one you posted, would be just hooking up the new filter with the old one also running in the tank to allow your previous filter to continue doing its job while allowing the new filter media to cycle alongside it.
