From a bit of googling;
Impedence;
In electrical engineering, impedance measures how easily a circuit conducts current when a voltage runs through it. Measured in ohms, impedance is a way of telling you how much of the voltage introduced at one end will really make it to the other end. Impedance depends on other qualities of electricity, such as resistance, reactance, inductance, and capacitance.
The simplest kind of impedance happens with direct current, or DC, electricity. In this case, it's the same thing as resistance. All that gets in the way of electrons making it through the circuit is the circuit's resistance to the flow of current. Resistance usually takes the form of leaked energy that gets diverted from its intended pathway and creates extra heat.
Impedance therefore refers to the cabs you will be hooking up to the
output. If you have one cab wired for all the drivers ( speakers ) inside to have an impedance of 8 ohms, then your amp above will be OK. If you then wire two of the same 8ohm cabs in parallel, then the impedance will halve - in other words 4 Ohms. That is also OK for your amp because it is made to handle it - according to the specs.
If you add any further cabs than the above in parallel, then the impedance will reduce even more and that's when it would be unwise to hook your amp into that system as it wold damage your amp. Similarly, if you would have two 4 ohm cabs in parallel, that would reduce the impedance by half to 2 ohms and that also would be dangerous.
As far as the Aguilar cab is concerned, and the literature for it, I read that the cab is available in either 4 or 8 ohm configuration. In other words you have a choice before you but it. You need to contact Aguilar to make sure.
It reads 700 watts RMS, but in reality the drivers will fart out at about 1/2 the 700 watts due to the drivers reaching their xmax ( think of it as the distance the cone can travel ) and any more power going in will simply result in heat and no more noise.
You'd be wise to go over to
http://billfitzmaurice.info/forum and ask for advice their regarding RMS, programm etc as there are a wealth of experts their who can explain this much better than I can.
Mo
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