Concert Lead Question

[Chris_87]

Sorry for the stupid question, i'm still trying to get to grips with wattage/ohms and what you can and can't run together, but i have one of the old silverface concert leads which i'm running through a matching Sunn 412 cab which runs a 300w 16ohms, i was wondering though if i could run a second cab with matching ratings? Or would i need a Slave? Basically can i run 2 cabs with the concert lead?

Cheers

[warandhairstyle]

one 16ohm cab + one 16ohm cab = 8ohm load total.

[django7866]

Yes, you can safely run down the concert lead to 4 ohms. 

[Isaac]

Here are the basics for combining impedances.

For equal impedances, divide the impedance by the number of impedances. So, as warandhairstyle notes above, two 16 ohm impedances gives 8 ohms total, two 8 ohm impedances gives 4 ohms, three 8's gives 2.67 ohms, four 16's 2 ohms, and so on.

For two mismatched impedances, use the product over the sum. An 8 ohm impedance combined with a 4 ohm impedance is (8*4)\(8+4)=32\12=2.67 ohms.

The general case is the total impedance Z=1\(1\Z1+1\Z2+1\Z3...)