I'm about to invest in some "prosumer" level 18V power tools, e.g. Makita, Dewalt, Metabo, etc. The general consensus appears to be that they're all more or less equal and it doesn't matter much which brand one goes with, but a few years ago I developed tinnitus which has made me more sensitive to high frequency sounds. And having tested a few cordless drill drivers at various hardware stores I can definitely tell they're not equal when it comes to what the noise sounds like, even if they measure similarly in sound pressure level.
Currently I have a Ryobi 18V brushless that I measure to 83-84 dB(c) at 1m which makes it pretty loud, and it also has a quite a quite high pitched sound which makes it worse. Looking at a spectrogram from a calibrated measurement mic there's a pretty clear peak at 6kHz. The drill drivers I've been looking at all have a rated sound pressure level (Lp) around 76 dB so they should already be noticeably less loud, but I'm hoping to find one without those high frequencies if possible.
I've been able to test a few drills in person and got some initial impressions. Unfortunately the local hardware stores have a pretty limited selection of brands, they don't have all models in the store, and you usually have to bother the staff if you want to try something with batteries in it. At first I thought I could remember my subjective opinion of different drivers, but when I later got the opportunity to re-compare two of them head to head I realised I have really bad memory..
Head-to-head comparisons that I've done:
Makita DDF484 vs Dewalt DCD791: The Makita has a very high frequency whine, kind of like dentist's drill. The Dewalt is probably just as loud, but a little lower pitch making the noise slightly more tolerable, while still not great.
Makita DDF484 vs 485 vs 486: When it comes to high pitched noise, 484 was worst, followed by 485, and the 486 was most tolerable.
Dewalt DCD791 vs DC800: The 800 had a more high pitched noise than the 791, once again reminding me of the dentist's drill.
Not compared with anything, so only subjective impression:
Hikoki (a.k.a. Metabo HPT in USA) DV18DD and Dewalt DCD777: Smaller and weaker tools but much more quiet than everything else. If I were going to buy 2 drill drivers I'd probably get something like these plus one larger for heavier work.
Metabo (the made in Germany, non-HPT, brand) DS 18 LT BL: Only had a quick try with this machine but without having anything to compare it with I thought it sounded pretty reasonably tolerable. There's a version with quick change chucks, unfortunately only the smaller (L) and larger (LTX) models have offset and angle chucks for some reason but that's a feature I would really like to have.
Anyone compared Milwaukee to other brands with respect to noise? The only store I found that sells them said they didn't have any charged batteries so I couldn't try any.
Not exactly sure what I'm expecting from this post, since the question is so subjective.. Perhaps someone with experience of multiple cordless drill drivers could share their opinion? Or someone else with a similar aversion to high pitched noises could say if they found any tool that they're happy with?