Matching amp power to cabs

[JimChjones]

I suppose the other thing worth mentioning is that a quoted 8ohm impedance is strictly nominal, and the real impedance of a cabinet will vary with frequency, quite significantly at the low end. So if I understand this stuff correctly this means that at some frequencies the 4*10 will have lower impedance than the 1*15, and take more of the amp power, and at other frequencies vv. So its not going to be exactly 300W each all the time. How much difference this makes in practice I lack the experience to comment, but its another reason it might be worth not running this setup flat out.

 

[Kro]

I think he was making a point that Increasing speaker surface area is a better option than increasing wattage if you want to be louder.

I mean, I get it – it’d be hard to calculate the volume of an exploding 1x10, but I still feel like it’d give that 8x10 a run for its money. It’d depend on if the 1x10 was neo or ceramic though, so that we could make sure we’re using the correct relative effectiveness factor multiplied by the correct mass of the driver, but running some maths and converting the calculated increase in pressure from the blast to decibels, it seems like that exploding ten would register around 1.37 times louder, give or take a few hundredths than the 8x10.

I hope that helps.