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Question about adding subs to a pair of PRX618s-XLF and other upgrade options.
Ok, I finally had a chance today to put the PRX 612 & PRX618XLF up against the PRX712 & PRX718XLF. In the pic, the 600 series is on the right, the 700 series on the left. The pic gives the illusion of dents, but it's actually shadows from the leaves.
For my test, I used my X32 Compact. For those who have an X32, I routed my main mix to Matrix 1&2 at zero db, and post fader so the main fader would control volume for both. All gains on all speakers were set to max. High pass was set from the internal crossover on the subwoofers
First test was with pink noise, subs only. To compare, I muted and unmuted each matrix one at a time. The 718 had a slightly higher volume, just slightly. Next test was with music, and once again, the 718 was just slightly louder. Running both subs at the same time, there was an obvious volume increase.
Next, I turned on the tops. First with the pink noise, the two systems seem to have equal volume. However, these boxes are voiced or dsp'd differently. Only way I can describe it with the pink noise is if you were hissing with your mouth open (like a fake applause), that is what the 612 sounded like. Now if you continue hissing, but close your mouth while extending your lips (like a wolf whistle), that was the 712. When running music between the two, the 612 sounded more "airy", the 712 more flat.
I tried swapping the cabinets with sub, since I read the 718 has a different high pass, but the results were still the same.
Since I had everything hooked up, I tried a couple scenarios of running everything together. Running the 600 series next to the 700 series, you get a very pronounced "phasing" or "woosh" as you walk around. Next, I daisy chained the tops off of one subs high pass. The phasing and wooshing was less pronounced. I swapped subs for the high pass to see if there was a difference, but none was noticeable. Finally, I turned the 612 upside down and placed on top of the 712 so the horns were together. The phasing or wooshing was gone. So, if you double up these cabs, upside down on top of the other appears to work the best, which makes sense.
I will also note, that the 712 by itself over top of the two subs sounds really good! I hope this helps.