[quote name='Sarah5string' post='789894' date='Mar 29 2010, 08:40 PM']So what you're saying is... if I had a 4ohm amp, and a 4ohm cab, then I'd get the full power.. but if I had an 8ohm amp and a 4 ohm cab I'd only have half, so would have to get another cab to get the full power out of it? And having a 4 ohm amp with an 8 ohm cab would be pointless? lol
clueless aren't I
edit: and also having a crap cab at any ohms would be pointless too? lol[/quote]
I dont think you have quite got it, and some of the other explanations are not not very clear.
If you are using a solid state amp, the power delivered by the amp is dependant on the impedance of the speaker cab you are using.
published specs for the eden traveller will develop 500 watts into a 4 ohm load and 300 into an 8 ohm load.
If you have one 8 ohm cab the amp will deliver 300watts, ie not full power, if paired with one 4 ohm cabinet it will deliver the full 500 watts.
However in the real world I dont think it makes much of an audible difference, for lots of technical reasons that alex or bill could explain.
I have twice used the same amp [seperately] with 4 ohm and 8 cabinets, in a gig situation, just by swapping the speaker cable and found no significant difference in volume.
The normal way to increase your volume is not to use a single 4 ohm cabinet in preference to an 8 ohm cabinet but to use two cabinets so you are using more speakers.
Two 8 ohm speakers plugged into the amp gives the amp a total impedance of 4 ohms allowing the amp to develop full power into more speakers.
Most amps [but not all] dont like two 4 ohm speakers.
Therefore if you buy an amp with a 4 ohm cab, it doesnt really give you much more volume, and it prevents you adding a second cab when you play the albert hall.
theres lots of maths in there but i tried to keep it simple
Does that help or make itworse?