Just like it says in the title: so if you drive a 4 ohm Low-B2 with an amp rated at 500W RMS (@0.5% distortion) @ 4 ohms, you have 250W/10" speaker. Vote away! Also any comments on the situations you find you rig suits and also ones where you've not had enough volume. I'm curious to see what the maximum acoustic power of an Acme speaker is, and also if the number of mid/high drivers makes a difference. So you know where I'm coming from, I've been using a pair of Low-B2II cabs for a few years now, powered with a Mackie M1400 which put 425W RMS into each cab at low distortion. (i.e. not the fake amount of 500W RMS which is at a higher distorion level). I've sold the Mackie because it's too damn heavy for me, and I'm looking to replace it with something like a QSC PLX and am wondering how much power to go for.