[quote name='Truckstop' post='1229152' date='May 12 2011, 06:43 PM']Case in point, I have a 350w 8ohm head and a 2x10 8ohm cab. 350w distributed between 2 10" speakers. However, in the neverending pursuit of more volume, I want to add on a 4x10 8ohm cab. So now, 350w of power is being distributed between 2 cabs equally, however, this means that both cabs are receiving 175w. So, in the 2x10 cab, each speaker is recieving 87.5w but in the 4x10 cab, each speaker is recieving only 43.75w. This means that the speakers in the 2x10 are being pushed harder and will distort at a lower volume than the 4x10.
So, it's important to make sure that when you are adding an extension cab, you need to make sure that the ohmage ensures equal wattage dispersion and then you make sure that the extension cab can handle the watts being delivered to it.
Hope it helps a little and, of course, IME!
Truckstop[/quote]
Not taking away from any of what Truckstop has said here, as is all sound advice (pardon the pun).
The first section above should have been worded more like "I have a 350w 4ohm head and a 2x10 8ohm cab. [b]200w[/b] distributed between 2 10" speakers. However, in the neverending pursuit of more volume, I want to add on a 4x10 8ohm cab. So now, 350w of power is being distributed between 2 cabs equally"
If the head was 350w at 8Ω, it would more likely be 5-600w at 4Ω, the rest of your maths was a good lesson tho
Sorry if I seem a little pedantic, no offence intended.