I have a Mackie 1400i power amp 1400 watts @ 4 ohms bridged 1000 watts @ 8 ohms bridged 700 + 700 watts @ 2 ohms stereo 500 + 500 watts @ 4 ohms stereo 300 + 300 watts @ 8 ohms stereo and an SWR Workingman's 4x10 400 Watts RMS 8 Ohms cab. Tired of contradictory info, I emailed both companies. I got different answers. I think Mackie is correct, based on what TB members have said, but I thought I'd ask about my gear very specifically in case I'm really just not getting something. (This can happen, see my milliamps thread in effects!) Thanks for taking the time to look this over. SWR said: Hello, Thank you for your interest in SWR products. [me] I have a Workingmans 4x10. I have no bass amp head, but have been using a mackie1400i power amp. I don't want to kill my 4x10, so I was wondering what mode should I run the Mackie in to preserve the speakers? [me] 300 watts @ 8 ohms per side in stereo. Mackie said: Your best bet would be to run the amp in bridged mono mode. The amp will deliver 960W maximum to the speaker. This may sound like a lot of power, but you're better off having MORE power available & not using all of it than running with just enough or too little power. If you have extra power that you don't use, you will never clip the amp & blow the speaker. If you drive it too hard, of course, you can burn out the speaker, but if you respect this fact & don't push it too hard, you'll be better off.