Combo amp with extension cab question

djandkassdaddy · #1 08-26-2011, 05:06 PM

New here so I am sorry in advance for everything I am about to ask.
Two part question:

Part one: Marshall MB4410 combo 450w at 2 ohms/of course another cab is required to make this happen/ Are the 450w split evenly between the speakers in the combo and the other cab??

Part two: Is there an obvious difference in volume between various combo/cab configurations if the ohms and watts stay the same?

will33 · #2 08-26-2011, 05:57 PM

Quote:

Originally Posted by djandkassdaddy

New here so I am sorry in advance for everything I am about to ask.
Two part question:

Part one: Marshall MB4410 combo 450w at 2 ohms/of course another cab is required to make this happen/ Are the 450w split evenly between the speakers in the combo and the other cab??

Part two: Is there an obvious difference in volume between various combo/cab configurations if the ohms and watts stay the same?

1. It's divided evenly between the two cabs assuming they are of the same impedance.

2. The spl spec for speaker is an indicator of how much sound coming out per watts going in although a lot of people tend to stretch the facts there. Higher spl speakers or just more speakers moving more air gets you louder than just throwing more power at the same speakers.

djandkassdaddy · #3 08-26-2011, 06:17 PM

So am I correct in assuming that adding a 4x10 cab to the MB4410 combo will be louder over a 2x10 or 1x15?

RickenBoogie · #4 08-26-2011, 06:22 PM

yes, by approx. 6 dB

djandkassdaddy · #5 08-26-2011, 10:24 PM

Thank you Will and Ricken. I appreciate the info. One last question if I may.....is there any benefit to adding a 8 ohm cab to a setup like the MB4410 instead of a 4 ohm cab with the same speaker configuration?

will33 · #6 08-26-2011, 10:34 PM

Assuming it doesn't make the impedance too low for the amp, you'd want the ext. to be the same as the combo's speakers so they're all evenly powered. One exception would be if you're adding a 210 to a 410. Then it makes sense to have a 4ohm 410 and a 8ohm 210. The 410 would get roughly 2/3 of the power with 4speakers to divide it between, the 210 would get roughly 1/3 with 2 speakers to divide it between making it work out where all 6 are evenly powered.

That's one of the downfalls of a 115+410 stack, the 15 gets half the power with only one speaker to absorb it all and starts to crap out when the 410 could still take more power and get louder. Always best to use all matching speakers.

will33 · #7 08-26-2011, 10:40 PM

The 2 best choices of ext. cabs for your rig would be an 8ohm 210 or 4ohm 410 Marshall cabinet that uses the same speakers as are in your combo. I see a 410 on their sight in the mb line of cabs but no 210.

djandkassdaddy · #8 08-26-2011, 10:46 PM

Thanks for the help will33 I really do appreciate the time.