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is an 8x10 better than two 4x10's

my guitar player thinks that my 8x10 is not as good as two 4x10's so i was wondering what the industry standard is?

If both cabs are of the same design,with the same components, they should sound similar. One difference could be if both cabs are ported, the bigger cab in my opinion should have a lower frequency response.

However, speaking of 2 Ampeg cabs, the 810e and 410HLF are different. The 410 cab has a different ohm rating plus the Ampeg 410 has a high freq. horn and a lower and higher frequency response rating than the 810e.

Is one better than the other? I say it is a matter of personal preference. I still prefer the 810e myself though.
 
basic ohms matching for cabs. Each cab added to another lowers the impedance by half of it's equal value.

example: plugging in 2- 8ohms equals a 4 ohm load

2- 4 ohm loads equals 2 ohms.

your amp is rated at 2 ohms per stereo side so this is safe but not all amps are rated below 4 ohms though. It is usually best to match cabs with the same impedance so you won't get odd impedance values like matching an 8 ohm with a 4 ohm for example.

When you decrease the impedance, most amps double the output power while spreading the wattage thru more speakers. this is an effective way to get more volume thru sound dispersement.
 
A lower Ohm rating will draw more power from your amp, IF it is capable of handling it. A lot of solid state amps can't go below 4 ohms, and if you put a 2 ohm load on it, it will fry the amp. Your amp can handle it though I believe.

yeah see i have the svt 4 pro and the only thing that i fully havent understood is the RMS power load like i have no idea what any of that means call me ignorant but thats just an confusing aspect of the amp so if anyone could help me with that two. my biggest thing with this is if i get a 410 could my amp handle it and if so could i close the ports on the cab so i get that 810 sound?