Yes, some makes and models have a lower tone pitch and some might be louder in volume, but I also think a lot of what you're perceiving is due to the camera's microphone pick-up. I have made some brief hunts with only the Apex's speaker at work, but most of the time I use the MS3 wireless headphones with the volume all the way up, except the Iron Audio Volume at '3' or sometimes '2.'

Monte

"Your EYES ... the only 100% accurate form of Discrimination!"
Stinkwater Wells Trading Post
Metal Detector Evaluations and Product Reviews monte@ahrps.org ... or ... monte@stinkwaterwells.com 503-481-8147Detector Outfit: A selection of my favorite makes and models, with the best coils mounted, for the tasks I'll take on.Pinpointers: Pulse-Dive & ProPointer AT .. Headphones: 'Hornet' & 'Wasp' .. MS-3 Z-Lynk .. ML-80 .. N/M Green edition*** All working well today to make memories for tomorrow. ***