Help setting up 2 subs
Hi all. I’ve seen some good stuff on the other thread running at the moment regarding 4 x ported Dayton UM’s but I didn’t want to by jack the thread out of respect.
I thought ide read up. I thought I knew what i was doing, the theory was there. But i need the knowledge to be able to fine tune my system. And have some specific questions. My system is as follows
1. 2 x 15” alpine type R in sealed enclosures one at front left (not corner. About 1 3rd in to room on front wall.. and one rear left corner. (Not as good natural response in right rear corner as I first tried.
2. Powered by one NX6000d. Channel one to one sub channel 2 to the other one is 4 ohm. Closest run and the other is 8ohm. I’ve set the limiter on the 4ohm channel to match the other.
3. Using 1 mono sub out from emotiva XMC1 processor to nx6000d using balanced XLR
4. Dirac like EQ along with delay and PEQ from nx6000d.
5. UMIK 1 and rew for setup and verification.
Basically I’m trying to get better quality bass, then integrate properly to mains LS50 speakers and also integrate both subs together properly with phase and delay..
I have started by trying to level match the subs which leads to my first question.
Q1. How do you level match the subs do this when the responses of the subs are so different? What frequency do I match to? Seems impossible to do if the level is different at most frequencies.
Q2. I have been measuring one sub on channel 1 (all EQ off and 200hz low pass with mains amp switched off, then swap to subs 2 and measure that, then try and level them up, then set delays on the rear sub and keep measuring until I get what I believe is the flattest response from 20 -200hz. Is the the correct approach?
Q3. I have been measuring the main listening position and no others as it seems a lot more time consuming and difficult to try for 2 or three measurements. Is this correct?
Q4. Once the delays have been set I used to the PEQ of the nx6000d to flatten the response by taking peaks. And not boosting anything. Running about just less than 3/4 gain. Then I run Dirac live..Is this recommended method? Or should I just leave it and let Dirac do it?.
Q5. And main question. I want to utilise the waterfall that is very one talks about but don’t really know what I’m looking at in that graph. Or understand what it shows me. An explanation would be good.
Is there anything more I should be doing / looking out for?
Also I don’t even know if I’m measuring correctly in rew . I just press measure, set the channel I want and measure it at around -30 volume in a quiet room. No timing reference, no smoothing applied. With the 90 degrees cal file for my UMIK loaded.
Sorry for the long post but wanted to provide more info and will be running measurements tonight and posting graphs so you can all slate my system. Lol
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