Originally Posted by jbrown15
So here was two measurements that we took yesterday while BassThatHz was over. The red graph is the screwy way that I had the amps setup and the blue graph is basically with zero boosting applied and just having a high pass filter in place to protect the drivers. Basically you can see that I was bottlenecking the subs and robbing them of output.
Oh there's also zero smoothing applied to the graphs.
I still think you could squeak out some more db's below 20hz if you buy a miniDSP.
The inuke is limited to 20hz, which isn't ideal for a ported sub that goes to 12-13hz.
If you are feeling more adventurous, you could apply the follow 2 DEQ's to all 4 channels (ie subs).
This will make the subs sound more aggressive at lower SPL's, so I don't think it would be too risky,
but you should optimize your gain structure firstly, like I mentioned in the GTG thread.
Or at least change your XO to this and increase your AVR sub-out back up to 0db.
or at least -5db in each would be the middle ground. That would still leave you 5db of risk-free boost in the AVR to avoid digital clipping.
When I first saw that his subs were rolling off like a rock at 23hz I instantly knew something was wrong (bad DSP settings or bad box tune), luckily it turned out to be the DSP settings.
He was running a +7db HS12 @ 20hz, which makes everything above 20hz 7db hot, but he was also running a 20hz HPF which made the <20hz even weaker
Basically he turned his $6000 subwoofer-system into a Bose-module with that one DSP filter. (Just giving ya a hard time... LOL!!!
The DEQ settings listed above is the correct way, and less-risky way, to boost below 20hz with the inukeDSP (rather than with a PEQ).