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Official Ampeg Club!: Part II

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Here is my main rig at a recent beer tent gig. It sounds glorious.

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Problem with that 3Pro rig, is they shouldn't be driven under 4 ohms. The 18 is already a 4 ohm cab. Ideally, if you want to run 2 cabs, they should both be 8 ohms. The 3Pro is in danger of burning up as it's set up now.

Yeah, I'm working under the assumption that the 18's impedance rises with increasing frequency, and the 4x8's impedance rises with decreasing frequency. At least that's the theory I'm hiding :hiding: behind. The speaker level crossover would definitely help keep the load up.
 
Yeah, I'm working under the assumption that the 18's impedance rises with increasing frequency, and the 4x8's impedance rises with decreasing frequency. At least that's the theory I'm hiding :hiding: behind. The speaker level crossover would definitely help keep the load up.

Except that it doesn't, to any meaningful degree. What it will do though, is seriously shorten the life of the 3Pro. Just trying to help a brother out. I wouldn't run that rig like that, if it were me.
 
Except that it doesn't, to any meaningful degree. What it will do though, is seriously shorten the life of the 3Pro. Just trying to help a brother out. I wouldn't run that rig like that, if it were me.

Thanks for trying to keep me out of trouble. :)

I'm not sure of the specs of the Ampeg 18, but I had a look at the impedance curve of the Eminence Delta Pro-18C, a 4ohm 18". The impedance is up to 8ohms by 200Hz, climbing steadily through 24ohms at 1kHz and beyond. I'm going to stick a 50uF non-polar cap in line with the 4x8 this evening.
 
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