Originally Posted by spacemunkey
I'm sending an rca cable to the nu6000 and converting it to a balanced cable so I can plug it in to the inuke. But it's just coming from the LFE out on the Marantz.
That's probably half of your problem right there, the 7703 and inuke support XLR, why in the world would you use RCA and cleanboxes in this case?
Also, why are you using 50db increments on the Y-axis? That's pretty much unreadable, but from the small amount that I can determine you appear to be down 45db by 10hz, and flat-ish to 30hz.
That room is L-shaped and easily close to 5000cuft by the looks of it, so it doesn't overly surprise me that you have SPL problems.
I suggest you set the limiter to max power, and then post a screenshot of the inuke level monitors.
-10db is 1/10th power, -3db is 50% power, clipping is full-power.
Brief clipping shouldn't hurt the amplifiers if the drivers can handle it.
I would also suggest turning off any EQ in the 7703, and ensuring bass-management is enabled and that the crossover is set high-ish (80hz is a good starting point, your sweeps are to 120hz. That should be with the speakers off, don't measure them together, not initially at-least.)
4 Full-marties would be the absolute minimum in such a large space. I have almost 32 subs and 100kW of amps in only 3000cuft.
A lot of basshead vastly underestimate the amount of supporting hardware needed to reach the SPL they desire (cleanly, and without melting/overheating.)
I've fried about 9 subwoofers over the last 20 years trying to reach the SPL I want.
How far do the drivers move when playing a 25hz sinewave?
It should be able to move at least 1inch.
I know that ported boxes minimize excursion for a given SPL, but SPL below 35hz is mostly limited by excursion... (or the lack thereof).
Obviously if the woofers don't move then it won't be loud (unless you have a lot of them...)
It takes about 32 watts to push 32 18's to 1mm and about 3200watts to push 1 18 to 32mm's, and both are the same SPL...
The rule of thumb is: if you are bottoming out or clipping/overheating, then you need to quadruple the amount of subwoofer amps and cones.
I've seen 4 quad full-marties visibly move doors in a 2000cuft room.
They are legit top-shelf subs, so chances are you've done something wrong or your ipuke is DOA (Made in China. It happens.), or your a basshead living in a barn-sized room. (time for octal full-marties?)
So in summary: turn off all the goofy DSP settings you have enabled. Leaving only the 20hz 12db/oct HPF enabled, limiters off; and then post a screenshot of your inuke level monitors during a clipping event.
Once we have confirmed you don't have enough amplifier/subwooferage (and not just playing at a low SPL with goofy settings) then we can proceed.
I assume you are using a UMIK-1 to capture these sweeps. That mic is limited to 130db with the the 0dbFS dips modification (found here: https://www.avsforum.com/forum/155-d...-umik-1-a.html
For most people 115-130db worth of bass should be strongly-felt.
I wouldn't recommend taking sweeps higher than 110db with the mic to leave some THD headroom.
I see you are taking sweeps at 100db, at that SPL, the bass should "just be starting" to be felt...