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FreshMeat wrote:thanks Dan. as far as power with the tubas, since the 2 lab 12 are rated at 400 wats rms. and the cabs are effecient what would be a recomended power for the cab. 800 watts or more ? thanks

Watts don't matter. Volts do. To reach maximum output the amp must have at least the voltage swing capability to reach the maximum voltage allowable for your driver configuration per the plans. Having up to 20% more voltage swing capacity is OK for extra headroom, though of course you'll be limiting the amp to the recommended voltage swing.

Your amp spec is 1600w into 2 ohms so a lab 12 is 400w so I would say you could run 4 Lab 12,s per channel hope this helps. I don,t like to run a amp bigger than the speakers, if you need more power get more speakers and amps.

Dan30 wrote:I am not familiar with your amp. I would only run 1 per channel. I don't trust a 2 ohm load.

You can run 2-3 per channel and still be above a 2 ohm load if you wire your drivers correctly.

Thanks Bill. i went back and read the t60 build pages and read the voltage necessary for 2x12 labs. how can i check the xti4000 if they can supply 50v for t60 ran parallel? also in the build pages it says 50v for 2 lab12 ran parallel. how does that calculate if i were to run 4 cabs , each single t60 ran parallel and 2 cabs per channel ran parallel bringing the impedance to 2 ohm load? thanks again

Parallel is parallel is parallel whether the drivers are in two boxes or four boxes, unless you were to series wire pairs of drivers but your amp doesn't have the voltage for that.

You can put four parallel drivers on each channel, which drives the amp very hard. I think I said that all before.