in my last thread i was deciding what type of amps to buy (cabs and head)
i narrowed it down to a laney r4 head with either two 410 laney cabs or one 410 cab with a 115 subwoofer.
My question is, could i run both the amp and woofer off of the same head or would i need separate heads?

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if u meen run the 410 and the 115 off the same head. i have with a 210 and a 115 just fine.

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thats not the question its a 410 and a 115 subwoofer

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Depending on the Head (Amp), yes you can power a 410 and a 115 (subwoofer) depending on how many Ohms the subwoofer is. and how much output the Head can handle, your looking at a pricey head unless you can get a good deal or offer.

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i was looking at the laney r4 head and 410 cab with a sub
the head is 300 watt
the cab is 250
and i think the sub is 250

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ok fuck that and nevermind i found a local store that just so happens to have a mesa roadready 215 and a big block 750.

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Like Tattered mentioned, it depends on your cabs's impedances and what your amp can dish out.
Here's the formula for figuring out what impedance your amp is "seeing":
1/(1/(impedance of cab 1) + 1/(impedance of cab 2))
so 2-8 ohm cabs: your amp sees 4 ohms
2-4 ohm cabs: your amps sees 2 ohms
1-4 ohm cab and 1 -8ohm: your amp sees 2.7 ohms

I wouldn't run your amp at 2 ohms or 2.7 for that matter, since this puts a lot of strain on your amp. Some amps claim to go that low, but it's generally not a good idea if you plan on running your amp for a while.
I also wouldn't suggest running 2 cabs with different impedances since the cab with the lower rating is going to get considerably more power and be louder than the other.
I'm not familiar with the head you're using, but if it's a tube amp, you should always have something hooked up to it.
Sounds like you should have a pretty damn decent set up regardless of the cab combination.
Just saw that you said your head was 300 watts and your cabs 250 each. General rule of thumb is to have an amp that's rated higher than whatever your cabs are. It shouldn't be too much of an issue unless you crank your amp, in which case you'll be sending a clipped signal through your speakers and maybe blow them.

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