First off, you should be able to get as much volume as you want. The RMX1450 is sensitive enough as-is to do fine with the SVP-CL, with or without compressor.
You should consider bridging if it isn't loud enough when at clipping. But from what you say, it seems you aren't getting there.
One important thing to remember about power amps...if you turn them down, you get less volume. Ok it's simple, but a lot of folks just run the power amp at about half on the control out of habit. You don't have to, they don't bite.
If you turn the RMX down to half on its front panel control, the 1.15V input sensitivity decreases by 10 dB. That would sound a bit quieter than "half as loud" as full up.
And, at that point, it takes 3.6V input to drive it to full power (5V peak for full power). If you turn it up, it takes only 1.15V for full power (1.6V peak). That's a big difference.
The SVP-CL isn't really gainy, but it will get into preamp distortion just like an old SVT (which it is based on) and it has enough output to drive the QSC directly. But if you run the QSC with its control down, and the preamp master down also, you won't get loud. Turn something up, preferably the power amp.
Don't use the XLR out, use the regular output and run into the 1/4 inch inputs on the RMX. The XLR is a line out settable pre or post for a PA send etc.
Try without the compressor first, then put that in if you want, and set it up to get the sound you want. The compressor should have an output control to set the level to wherever you want.
But the compressor has the potential to squash your volume too much. Use it if you want, but be aware that you will probably have to turn up the output, because you can squash a lot of the dynamics of the signal with it, depending how you have attack and decay set. That changes your perception of loudness.
That setup should work fine for you (if you like compression). People are using the SVP-CL directly with less sensitive power amps than that one, and are fine.
You should consider bridging if it isn't loud enough when at clipping. But from what you say, it seems you aren't getting there.
One important thing to remember about power amps...if you turn them down, you get less volume. Ok it's simple, but a lot of folks just run the power amp at about half on the control out of habit. You don't have to, they don't bite.
If you turn the RMX down to half on its front panel control, the 1.15V input sensitivity decreases by 10 dB. That would sound a bit quieter than "half as loud" as full up.
And, at that point, it takes 3.6V input to drive it to full power (5V peak for full power). If you turn it up, it takes only 1.15V for full power (1.6V peak). That's a big difference.
The SVP-CL isn't really gainy, but it will get into preamp distortion just like an old SVT (which it is based on) and it has enough output to drive the QSC directly. But if you run the QSC with its control down, and the preamp master down also, you won't get loud. Turn something up, preferably the power amp.
Don't use the XLR out, use the regular output and run into the 1/4 inch inputs on the RMX. The XLR is a line out settable pre or post for a PA send etc.
Try without the compressor first, then put that in if you want, and set it up to get the sound you want. The compressor should have an output control to set the level to wherever you want.
But the compressor has the potential to squash your volume too much. Use it if you want, but be aware that you will probably have to turn up the output, because you can squash a lot of the dynamics of the signal with it, depending how you have attack and decay set. That changes your perception of loudness.
That setup should work fine for you (if you like compression). People are using the SVP-CL directly with less sensitive power amps than that one, and are fine.
