The thing is I use the those to get the best tone out of the head,
It's not the "best tone" if you can't hear it.
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The thing is I use the those to get the best tone out of the head,
I would say,
buy a power amp, and some decent 4-10s or 8-10s
the sound is not going to change your sound, it makes the amp go louder.

In my experience, the best way to get the most perceived volume per watt with any given rig is to drop some lows and crank the mids.
Mids = volume and tone
Bass = mud and power drain
I understand that with a 200 watt and 500 watt cab setup, each cab will only get 200 watts,
A clipping amp signal from an over-taxed amp will kill a speaker faster than a a clean signal from a big amp running more watts than the cab is "rated for".
Example: Running a 1000 watt cab with a 100 watt amp at 110% (eleven) is going to be far worse than running your 1,200 watt amp at 50% into your 200 watt/500 watt cab combo. Distortion Kills!


Nope, they will get as much power as you send to them. The amp is very dumb, it only knows the ohms its hooked to, not what the wattage the cabs can handle. The 200 watt cab can only handle so much before it melts down. A clipping amp signal from an over-taxed amp will kill a speaker faster than a a clean signal from a big amp running more watts than the cab is "rated for".
Example: Running a 1000 watt cab with a 100 watt amp at 110% (eleven) is going to be far worse than running your 1,200 watt amp at 50% into your 200 watt/500 watt cab combo. Distortion Kills!
Nope, they will get as much power as you send to them. The amp is very dumb, it only knows the ohms its hooked to, not what the wattage the cabs can handle. The 200 watt cab can only handle so much before it melts down. A clipping amp signal from an over-taxed amp will kill a speaker faster than a a clean signal from a big amp running more watts than the cab is "rated for".
Example: Running a 1000 watt cab with a 100 watt amp at 110% (eleven) is going to be far worse than running your 1,200 watt amp at 50% into your 200 watt/500 watt cab combo. Distortion Kills!
Personally, I'd try and source an 810. It sounds like you'd need the speaker area. Also, some science would suggest that unless you're bi-amping, running drivers of different sizes can create tonal/volume issues. Just some food for thought.
I read a lot of misinformed comment in this thread.
A 400w cab simply means that the manufacturer suggest you run it at no more than 400w.
You can't turn up really loud because the 200W cab will start distorting and might blow up before the other cab is even fed enough power to start sounding good.
The orange light is bad however, it indicates that your amp is clipping and that is really bad for your speakers, especially with such a high power head. that light should almost never turn on.
So in order to get more volume out of your SVT4 pro--
use very efficient cabs
don't boost the low end so much
more speaker area is your friend
I've tried plugging speaker cables into amp a and amp b slots, and i've mono bridged them and chained the cabs together, i didn't see a difference, but i never changed the stereo/bridge button on the back of the head from in to out, that could be it.
Personally, I'd try and source an 810. It sounds like you'd need the speaker area. Also, some science would suggest that unless you're bi-amping, running drivers of different sizes can create tonal/volume issues. Just some food for thought.
I'd source a roadie first...

Really? 8x10's or similar sized cabs are far easier to move around than any smaller cab you have to deadlift off the floor IMO.