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The whole passage on speaker support on laptops blew me away. I knew I was vaguely impressed that you can get such (comparatively) good sound on ultralight lapt
by tomcam 4y ago
The whole passage on speaker support on laptops blew me away. I knew I was vaguely impressed that you can get such (comparatively) good sound on ultralight laptops, but didn't know what was happening under the hood. Quick sample:
> Modern micro-speakers require sophisticated software EQ to sound good, but they also require sophisticated safety models! The most critical safety parameter for micro-speakers is the temperature of the voice coil: you don’t want to melt the thing
They destroyed their own tweeter while testing!
- astrange 4y agoTo be fair, you can pretty easily destroy any size speakers by overdriving them. Your amp doesn’t magically know what’s on the other end of it.
- kccqzy 4y agoIt absolutely blew me away too. I mean I kind of respected those engineers for being good software engineers but clearly their skill sets extended beyond that. Quoting from the investigation of how they blew up their tweeter: > Assuming a constant resistance (which isn't true but it'll do for now), with the amp at 15.5 dBV, and input at -2dBFS, that's 13.5 dBV = 4.73 Vrms, current at 3.72Ω is 1.27 A. Almost exactly 6 W I was pumping into each tweeter. > We have τ_Tvc = 3.9 and τ_Tmg = 70, and I think T_sett_vc=104.9 and T_sett_mg=129.5 are the thermal resistances in °C/W. That means that, if I'm mental mathing right, the tweeter voice coil would've reached >600°C after a few seconds, give or take (and longer as the magnet heats up). > Yeah, no wonder I cooked it.