Ampeg Bass cabs 4 ohms and 8 ohms?

Nov 29, 2014
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Naples,FL
Questions I have a 4x10" ampeg 8 ohm cab and a 15" ampeg cab both 8 ohms.
What would be the reduction in sound by adding an Ampeg 4 ohm 4x10"?
I like the thought of 8x10" ,but 4 and 8 I do not think mix well.
I am using an GK 700 RB & also I can use a Eden 550.
Good ,bad or other wise?
Thanx for any input.