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[OM] First pass at dual sub integration

Subject: [OM] First pass at dual sub integration
From: Mike Gordon via olympus <olympus@xxxxxxxxxxxxxxxxx>
Date: Sat, 19 Dec 2020 23:27:41 +0000 (UTC)
Cc: usher99@xxxxxxx
I think I am liking the minidsp--very fast to work with.     

I first gain matched the passive sub with the powered sub--ultra cube 10 sing a 
55 Hz test tone.  I just used my phone as SPL as didn't want to get out the 
calibrated Mic yet.   The passive sub is powered by 
by an ancient NAD amplifier bridged for mono.  I had to up the gain to +12 dB 
which kept the passive sub a tad below the UC-10. I had no clue I happened to 
pick a peak on this sub.

The powered sub has two 9" passive radiators to keep the box smaller than 
adding a port.  

The passive sub response curve is light brown curve, #1, the UC-10 #2 green and 
the best i could do in time alignment --#10 blue. 

http://zone-10.com/tope2/main.php?g2_itemId=23680


Curiously the passive sub is 8ft closer to the MLP (main listening position) 
than the UC-10  one would predict about 8msec delay for the passive sub would 
be about right---it was actually 4.7 msec to get the best output!!  The passive 
sub seems to smooth the response at least when I move the mic to different 
positions.   I did make an attempt to construct a "House Curve" and REW enabled 
them to be directly loaded into the mini-dsp with a click--unlike others.  (I 
guess pros like Behringer among others).  I had to enable REW (room eq wizard) 
to use narrow filters and allow it  to boost up to 6db to in theory ameliorate 
the null at about 60hz.  The predicted response looks quite good to my 
inexperienced eyes.   If it is a room null, might be like throwing a few 
handfuls of dirt  down a sinkhole, but REW predicted it is filled in.  The CAO 
(chief aesthetics officer) largely determined sub placement so am up the creek 
on that solution.

 I ran out of time  to load the filters and play further as wanted the current 
data to sink in and post here.   I expected the passive sub to perform way 
better and it is a bit like 
finding out a favorite lens has mediocre MTF---still can take decent  images or 
produce good sound. 

Any suggestions?  Should I have cut the UC-10 output in the gain match a 
bit--already at 12dB boost on the minidsp for the passive guy?


Seeking  the lowdown on the low down tones, Mike
-- 
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