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7K views 44 replies 5 participants last post by  Moez 
#1 ·
I've spent 3 days trying to get my computer hooked up with Room EQ without any success at all. Tried connecting my creative soundcard Live! without any success at all. I'm seeing that a manual approach is being offered on both BVD and using the TAMREQ wizard. I guess i'm not the only person having a tough time getting the soundcard connected with the RoomEQ software. I'd rather use the RoomEQ or RS +D which I am licensed than doing it manually. Can you help me get this soundcard of mine acknowledged by RoomEQ?...Thanks:praying:
 
#27 ·
thanks for the advice John ..I'll check these ideas out...also wanted to ask you if changing the phase on a speaker is ok if it gets a better result in the measurement? Also wanted to know if I should use my centre which is an B&W HTM as full range or bass limited?
 
#29 ·
my left main only out of phase looked soooo much better , flatter, but if you think it's not a good idea I'll switch it back....the problem with my setup in the front is right main is less than a meter from the sidewall and my left is two meters away
 
#34 ·
John do you have any good places to look for info on treating the room? I've got some canyons/nulls on these measurements I'd like to address if I could. I've noticed that when I play a constant frequency that I'm seeing as a big null and crawl around the room and see where it's the most quiet, what am I to do to treat it? Just wondering how much control I have over it?
 
#36 ·
#38 ·
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Hi John, I'm posting a measurement of my two subs...I think it looks pretty good but when I take a measurement of my subs along with the left front speaker(set as bass limited) I get a measure,ent that looks like the second post. I've set the crossover in the AV at 80...any idea why it's so much higher than the keft speaker?
 
#39 ·
Do you mean why is the bass higher in the measurement with left+subs than with left alone? That's because the bass management filters for a main speaker only roll off at 12dB/octave (i.e. with the crossover at 80Hz, the level at 40Hz will be 12dB lower than without a crossover and at 20Hz it will be 24dB lower). Your speakers have very good bass extension so even with the crossover filter in place there is still significant low frequency output which adds to that produced by the subs. What does the left speaker measurement alone look like, when run as full range?
 
#41 ·
That certainly is quite a dip, worth seeing whether it is still there if you test both left and right speakers playing at the same time. Also try measuring with the mic a foot or two to either side and forwards and backwards of the listening position to see how localised that dip is. The speaker does have a LOT of low frequency output though, they really don't need any help from a sub at the bottom end.
 
#42 ·
This may be a dumb question John but how do I test both left and right at the same time. Do I chose either left or right in RoomEQ? I know the sub works with either left or right when I chose it as bass limited but not sure how to test both fronts at the same time...Oh I will try moving the mic around...great idea since I can move my sofa around to work...thanks.
 
#44 ·
Hey Moez, I think a lot of what you're seeing is the result of changing the scales of the graphs...your sub and left+sub are both essentially 84dB peak throughout the band below the crossover region. And the output at 60Hz hasn't changed either. The peak at 24Hz makes sense in light of the huge peak of the left speaker.

Did the mic move at all between the different measurements? Even as much as an inch inadvertantly?

It looks to me like you've got some destructive interference in the 55-90Hz region which has led you to boosting the output of the subwoofer for a flatter crossover transition. Did you smooth the graphs? Unsmoothed is more informative.

Anyways, try dropping the output of your sub 12dB (for when measuring just the left + subs) and then take some more measurements (and keep it unsmoothed). You should notice much more dramatic dips in the crossover region. When you've got both mains playing, you should probably drop the subwoofer 6dB (since there should be a 6dB rise in the higher frequencies compared to just the left main).
 
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