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Discussion Starter #42
So I guess the two filters would be a good place to start. I guess the two dips it shows really will not be the true response once they are applied. I have been watching for a used 1124P. They seem to be a pretty hot item. They go very quickly.

I demoed War of the Worlds and there is just a tremendous amount of more bass now. I know I will not be needing any buttkickers any time soon. :bigsmile:

I am still trying to wrap my head around the whole house curve idea. How do you go about seeing if you need one? Do you have REW play a 100Hz sine wave and then a 30Hz and see what volume difference you hear?

I have read the link you posted a couple of times. I like what he says about changing the vertical limits. My graph looks a lot more subtle that way.
 

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I use the Hard Knee HC for movies only and switch back to a standard curve for music titles. I just like the way it sounds and feels for movies. I am going to change the gain on the filters to reflect the new vertical limits and see what it sounds like.

Larry
 

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Discussion Starter #45
I just did...

1. Find peaks between 20-80Hz.
2. Assign Filters.
3. Optimize PK Gain & Q

And....
 

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Increase the cutoff frequency for the subwoofer target so that it matches the cutoff of the MBM then redo the optimise for the filters, at the moment the target is not correct for the system.
 

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Discussion Starter #48
Increase the cutoff frequency for the subwoofer target so that it matches the cutoff of the MBM then redo the optimise for the filters, at the moment the target is not correct for the system.
Sorry John, I am still very new to this and really appreciate you commenting on my situation. Is this better?
 

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Simply set the cutoff in REW to the cutoff of the MBM module, so you can include the peaks that it is responsible for...

brucek
 

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Discussion Starter #50
Simply set the cutoff in REW to the cutoff of the MBM module, so you can include the peaks that it is responsible for...

brucek
Gotcha. That's is what I did. My MBM is xo at 80Hz. I did a search for peaks between 20 - 80Hz.

Although looking at my graphs, I have been debating about playing with the xo point. that transition between the MBM (80Hz) to the highs does not look smooth. Just a reminder, the last few graphs have all been with the mains on.
 

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If your mains are on then the target shape should be full range - basically a flat line plus whatever house curve response you are targeting, if any. The target response that rolls off at the high end is only appropriate when you are measuring with the mains off and the sub crossover filter is active, it then shows what the ideal response would be. Once the mains are added in your ideal is for everything to be flat, so that is the target response you want REW to aim for when applying filters.
 

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Discussion Starter #52
Well I read the house curve section again. I used REW to play a sine wave at 80Hz and had a spl reading of 74dB. I then had REW play a 32Hz sine wave and had a spl reading of 73dB. If I play a 100Hz wave, the reading only goes to 75dB. Am I understanding correctly that I do not need much of a curve?
 

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play a 32Hz sine wave and had a spl reading of 73dB. If I play a 100Hz wave, the reading only goes to 75dB. Am I understanding correctly that I do not need much of a curve?
You may have missed the point. You measured basically the same level at 32Hz and 100Hz - now, how did you perceive it?

From the house curve article you read, it says:

a house curve is perceived flat response as opposed to measured flat response.

It then says:

After your sub’s response is reasonably smooth, play a couple of sine wave test tones, one at 100 Hz (or whatever your sub’s crossover frequency is), the other at about 32 Hz. (Naturally, you don’t want either of these to be in a null - shift your test tone up or down if you have to.) With measured flat response (or a less-than-optimal house curve), the 100 Hz tone will sound louder than the 32 Hz tone. If that’s what you find, your sub’s response needs to be adjusted so that both test tones sound like they’re the same volume level. Yes, that’s a highly subjective evaluation, but remember a house curve is perceived flat response – that is, it sounds flat, not measures flat.

brucek
 

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Discussion Starter #54 (Edited)
Ok, maybe this time I got it. I relistened to the two tones and adjusted the volume to see about a 5dB difference. I then created a house curve of 80 0.0 and then 30 5.0. I adjusted my target to 75dB and loaded the house curve.

Once loaded, I applied 1/3 octive smoothing and had REW find the peaks from 20-80Hz and create filters. After optimize PK and adjust PK, I reviewed the filters. REW only created one filter (@ 49Hz). I added a second to boost the 23-31Hz range. So the filters look something like this....

1. PA 49.00 -9 12 for 13.9Hz
2. PA 26.62 +6 17 for 10.7Hz

Am I on the right track now?
 

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Discussion Starter #56
Thanks for all your help brucek :hail:!

Anything else I could do to improve? I finally have a Behringer DSP1124P on the way. Now to just :daydream: until it gets here.
 

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Once loaded, I applied 1/3 octive smoothing and had REW find the peaks from 20-80Hz and create filters. After optimize PK and adjust PK, I reviewed the filters. REW only created one filter (@ 49Hz). I added a second to boost the 23-31Hz range. So the filters look something like this....

1. PA 49.00 -9 12 for 13.9Hz
2. PA 26.62 +6 17 for 10.7Hz

Am I on the right track now?


Yes, but the idea is for equalized response to track the house curve Target. Another filter centered between 60-70 Hz ought to do it...

Regards,
Wayne
 

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Discussion Starter #59
:jump::jump:, Thank you for sticking with it, weverb. I learned so much from this discussion.:bigsmile:

Line up your demo scenes and music tracks.:T

Larry
I already started today! I am not sure if the slight feeling of nausea is from not eating or too much bass! :bigsmile:
 

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Discussion Starter #60
Thanks to Wayne's suggestions....

1. PA 26.62 +6 17 for 10.7Hz.
2. PA 49.00 -9 12 for 13.9Hz.
3. PA 66.4 -5 9 for 14.1Hz.

Results in..
 

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