Originally Posted by nube
Based on the frequency responses on that bench test of the NU6000, I would absolutely not use it for sealed sub duty.
From teslaman over at the speakerplans.com forums (not my image):
It's down 2dB at 10hz, but sloping down sharply. No mention of how it's performing at 5hz, but I suspect it's just like the other end of the curve, -5dB at 5hz, and -8dB at 2.5hz. This is bad if you want the lowest octaves. Why else would you go multiple sealed?
It also looks to add about 1% THD+N at significant drive levels in bass duty. Probably not worth quibbling about, but there are likely better choices for multiple sealed alignments.
I wish folks would post a loopback of their player, AVR and any other outboard hardware that's in line (like the DCX, MiniDSP, etc.)
I have a loopback of the Onk AVRs, Oppo players and the DCX. If you add the NU amp to that chain, you're down -30dB @ 3 Hz, -14dB @ 5 Hz.
For contrast, using the new [To Be Revealed Soon] into the SEQSS and Clone, the signal chain is down -1dB @ 5 Hz and -5dB @ 3 Hz. That's when you find out what your system is made of, but you need far less displacement because it's all being used relative to the rest of the signal chain.
IOW, say you have 16-18" RS18s. That gives you 50 or so liters of displacement capability, but if you're down -14dB @ 5 Hz, and -30dB @ 3 Hz, your math is destroyed in the model which doesn't reflect that roll off in your modeled L/T and there's no safe way to compensate for it either (at least all of my attempts failed miserably).
My 8x15" Tumult based system gave me just about the same displacement as the 16x18" RS18 system, only it was 10 years ago. I was using an Outlaw pre/pro into a Marchand Bassis powered by QSC amps. I was only down -4dB @ 5 Hz and -15dB at 3 Hz and the roll off was exactly reflected in all of my posted in-room FR graphs and later in my SpecLab caps of mic'd movie scenes.
The new roll off caused a redesign of SEQSS, drivers, enclosures and power plant, but what a ride. I can best most any LMS-based system below 10 Hz using lowly 15s simply because the LMS drivers just aren't getting the signal.
Since I have 100s of SL caps for comparison, the proof, as always, will be in the pudding for anyone who cares to see.
I'm prepared for the majority to ignore it all and argue ad nauseum against the facts of the matter as SOP around here. What a shame. The recent spate of mega builds could be ramped up quite a few notches on the Holy S@%# scale.
Nice to see ya posting, Nube. Wish you'd bump your build thread with pics of how it ended up.