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
--
_________________________________________________________________
Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
Archives: http://lists.thomasclausen.net/mailman/private/olympus/
Themed Olympus Photo Exhibition: http://www.tope.nl/
|