That's the first thing our program director checked out with me and the headphones gear.
My ampy scope works + or - five points mmHg. Only a problem when determining when or when not to give Nitro. Amplified stethoscopes aren't a problem, or they wouldn't be so popular among doctors and others using them in the industry. Don't knock it until you've tried it. I have
PM's borrow mine all the time since they can hear over jaws, K-12s and hose washing. If you bump it half down again, you can hear peristalsis sounds, without being over the abdomen which is usually covered in mast trousers, straps, splints, etc.
The advantages are more than what you fear as a potential mechanical inaccuracy.
I counter with, well then, how can you trust the automated BP cuff? If it's too tight, you get
too high, or too loose, you get an off reading. Same concerns, different machine. Right? Patti