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P.A. cab driver change


Noisyjon
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Hi Alex,

I've been asked about this P.A. related question, but it's out of my league so if you'd be so kind?

The system comprises of 1 x Marshall P.A.400 mixer amp unit along with matching Marshall (6115H) 175W, 1x15 plus horn speakers. They are 8 ohm rated.
The amp puts out 200W @ 8 ohm, 300W @ 4 ohm and 400W @ 2 ohm.
I mentioned that a pair of 4 ohm Eminence Kappalite 3015's will not only offer the 2 ohm load for the 400W output but they will happily take the 400W all day & night.

My concern and question for you is - will the crossover & horn be OK with this change or will they need looking at and possibly changing?

Any help mucho appreciated,
Regards,
Jon.

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Hi Jon,

Unfortunately you can't get the 3015s in a 4 ohm version and I can't see a driver swap being a success anyway because the change in response, sensitivity and impedance curve will throw the crossover and the resulting sound out of whack. Also it would be a bit like putting a Ferrari engine in a Skoda - so if you're lucky it might perform better but it'll also show up the limitations of the cab (insufficient bracing/damping, undersized ports, tweeter THD is rather high, etc).

Sorry!

Alex

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