Markbass cmd 102p

[88persuader]

My Aguilar 751 can do 2 ohms (925 W). So can many other amps.

I'm sure you're right but I didn't say ALL bass amps only go to 4 ohms, I said most only go to 4 ohms and I THINK that's a correct statement. But yes, some do go down to 2 ohms for sure and they can support two 4 ohm cabs.

 

[jaibeau]

My head is spinning reading this madness! Is 8 or 4 ohm 102 cab the right one for the 102p combo? Thanks TB

 

[GrowlerBox]

My head is spinning reading this madness! Is 8 or 4 ohm 102 cab the right one for the 102p combo? Thanks TB

8 ohm. Spin no longer.

 

[GrowlerBox]

My friend tells me the two 8 Ohm cabs coming from the amp increase the load on the amp by reducing the Ohm rating to 4. He says further that when the third cab is added....not direct into the amp, but daisy chained from the extension cab....it has a multiplying effect on the Ohm rating and thereby does not further increase the load on the amp. His analogy was, "The third speaker connection is like daisy chaining PA monitors together, it doesn't increase the load on the amp".

I'm not certain about the math to get to the Ohm rating for my full setup, but according to this tech, the rating does not fall below the maximum 4 Ohm load in the setup I use as described. He has assured me my amp is not in danger of overloading.

If someone knows something different, or knows the calculation to get the the load rating, I'd appreciate hearing from you.

Your friend is wrong, I'm afraid. The inputs on 99.99% of bass cabinets are wired in parallel, just like those on the back of your head, and will reduce the impedance the power amp sees in exactly the same way.

With 3 x 8 ohm cabinets, your total impedance is 2.67 ohms [1/(1/8 + 1/8 + 1/8)]. This may work for short periods at low volume in a cool room, but if your amp's thermal protection works properly it will shut down. If it doesn't work properly, it will burn. And you will (rightly) void any warranty you might still have.