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With a 4x10 and 2x10 together, are you sure it wasn't just the 2x10 farting out as those drivers were getting twice the power of the drivers in the 4x10 (unless I missed something)? Probably would have been ok with just the 4x10 in that case.
I did tons of stuff outside all last summer with and acoustic b410 and a line6 hd 750. (Weird rig, I know. I bought the pieces in a jam when I had a problem) The cab was 8 ohm so the head was only running at about 375w. This rig throttled outdoors. It sounds to me like your head is just under powered with the 8ohm cab. I know acoustic has a bad rep around here but a cheap (I guarantee it would be hugely effective) solution would be to just add another identical b410 to the rig. You will get the coupling effect and pull more power out of your head at 4 ohms. I personally was very surprised because I just bought the b410 cheap in jam and it turned out to work great for me. I have since sold it but only because I got my svt rig. I would recommend it to anyone though.This is for a medium sized gig outside with no FOH or pa support. Last year, I used my GK400rb with an Acoustic 410 and Peavey Headliner 210. It was farting out and I don't know if it was the cabinets or the amp struggling. I now have an MB500 and looking to add another cabinet. Maybe a 15 or another 410. Any suggestions?