Tutorial: Dual sub integration using the MiniDSP - Page 9 - AVS Forum | Home Theater Discussions And Reviews
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post #241 of 255 Old 04-11-2015, 05:47 PM
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Quote:
Originally Posted by Gorilla Killa View Post
Davey, sorry if this was covered, have you tried exporting REW sweep to the Mini and let it set it up, then adjust the biquad settings from there if you don't like what you hear.


its always better to cut than add boost at a certain fq, that said I have a hump a 40hz, and regardless of what I cut or add it will remain until I add another sub, which is coming soon
I use XTZ room analyzer and it does not allow direct import, but it gives you your room mode correction values to input manually. I've done that and reduced a peak pre Audyssey.

I changed location of one sub again and I think I have it better now.

Primarily now I'm trying to find someone who is familiar wit this product and wiling to give me values to try and increase the mid bass punch.

I'm realy green, and don't even know what frequencies mid bass is, I just know I like it. I'd like to 'feel' the gun shots and stuff more.

Can someone give me a suggestion of:
Filter Type
Q value
+\- DB value
Frequency(s)
That I could input in miniDsp to see if it gives more mid Bass?
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post #242 of 255 Old 04-12-2015, 04:12 AM
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The lower the value of "Q" the tighter the bass, mid bass 50hz to 150hx approx. If your getting a flat response increase across the board slowly, too much boost can cause distortion


for $10 you can get the 2.1 plugin on the minidsp site, it will allow you export the REW to the plugin, it makes it extremely easy.
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post #243 of 255 Old 04-12-2015, 09:02 AM
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If I make changes to plug in screen (add some filters) and then hook up minidsp to computer and hit sync - are said changes supposed to go on it right then?

Because it's not on mine. I've ran room graphs before and after making lots of changes to dsP and the graphs are identical.

I also noticed anytime I do hit green sync button it disappears. The only way to get it back is to unplug and plug the usb.

Currently I have minidsp hooked up to subs properly. I know this because I can adjust gains while its in sync. I have it being powered with a usb to standard wall plug in dongle.

When I want to hook it to computer, I simply unplug the usb on minidsp and plug in another one that has a long enough cord to reach to my laptop.
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post #244 of 255 Old 04-13-2015, 03:19 AM
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If the sync button is gone, then your sync'd, try the link below, this is the short and quick way to set up. Jerry Austin did a great write up on REW look into that. Im far from an expert on REW or the miniDSP, but Ive been where you are, I found spending time and going thru the motions was helpful.






http://www.minidsp.com/applications/...q-step-by-step
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post #245 of 255 Old 04-13-2015, 08:19 AM
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Quote:
Originally Posted by DaveyMac View Post


I use XTZ room analyzer and it found no room modes. It did show a rather wide peak at about 40hz, so I added two PEQ's to the MiniDsp to tame that.

This graph PINK LINE is with Q Control on my actual subs set to max Q0.7
BLUE LINE is with Q Control set to Q0.3
I'm assuming Q0.3/blue line is better here? Since the front part of line is closer to back.

I'm at a total loss though. Gunshots in movies sound weak and it just seems like it lacks oomph.

If you have advice on a filter to add - I would be very grateful if you shared it. I'm clueless on this stuff so I'd need to know Filter type, Q factor, db's, and Frequency.

Please - any suggestion is welcome.
Davey,

You've got a ~12-13db dip from ~65-150hz, this is where the "meat" of mid-bass resides. This suckout could very well be a null and no amount of EQ will help, therefore you need to try to flatten that section with sub/speaker/MLP placement, time/phase alignment before you're going to have good mid-bass response.

What are your mains? Have you tried measuring away from the MLP (Main Listening Position), and if so, do you get a significantly different response?

Also, the punch-in-the-chest mid-bass you're looking for doesn't really become noticeable until pretty high SPL levels. What MV (Master Volume) level are you listening at? I only ask because your graph was taken at a very low SPL.
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post #246 of 255 Old 04-13-2015, 01:00 PM
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Quote:
Originally Posted by Alan P View Post
Davey,

You've got a ~12-13db dip from ~65-150hz, this is where the "meat" of mid-bass resides. This suckout could very well be a null and no amount of EQ will help, therefore you need to try to flatten that section with sub/speaker/MLP placement, time/phase alignment before you're going to have good mid-bass response.

What are your mains? Have you tried measuring away from the MLP (Main Listening Position), and if so, do you get a significantly different response?

Also, the punch-in-the-chest mid-bass you're looking for doesn't really become noticeable until pretty high SPL levels. What MV (Master Volume) level are you listening at? I only ask because your graph was taken at a very low SPL.

My system is 5.2.2 front heights. All HSU bookshelves and center, HSU VTF3 MK5's for the subs.
The 'suckout' seems to be everywhere. I've made radical changes to the subplacement and measured in other places.


Can someone with minidsp confirms this works:


1. Your minidsp is NOT hooked up to your computer
2. You make some changes on plugin application on your computer
3. You THEN unplug minidsp from your system and plug it into computer
4. You hit 'sync' button - and voila all changes are on there.


Is that how it works? Because that's what I'm doing. And no changes are apparently being stored, because before and after graphs are identical.


I'm starting to wonder if you have to hook up minidsp to computer and hit sync - and then and only then make changes - then go hook it up to system. I.e. you have to make changes while it's hooked up and synced or they don't stick?


If anyone has done it the numbered way above, let me know. Then I will know I just have faulty minidsp.
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post #247 of 255 Old 04-13-2015, 02:50 PM
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Quote:
Originally Posted by DaveyMac View Post
My system is 5.2.2 front heights. All HSU bookshelves and center, HSU VTF3 MK5's for the subs.
The 'suckout' seems to be everywhere. I've made radical changes to the subplacement and measured in other places.
Hmmm....what mic are you using?

If the suckout is everywhere, you've either got a very unique room or there is a problem with your speakers or your measuring equipment. I would suspect the measuring equipment/setup.

You could try some nearfield measurements of your speakers just to rule out any issues with the speakers themselves.


Quote:
Can someone with minidsp confirms this works:


1. Your minidsp is NOT hooked up to your computer
2. You make some changes on plugin application on your computer
3. You THEN unplug minidsp from your system and plug it into computer
4. You hit 'sync' button - and voila all changes are on there.


Is that how it works? Because that's what I'm doing. And no changes are apparently being stored, because before and after graphs are identical.


I'm starting to wonder if you have to hook up minidsp to computer and hit sync - and then and only then make changes - then go hook it up to system. I.e. you have to make changes while it's hooked up and synced or they don't stick?


If anyone has done it the numbered way above, let me know. Then I will know I just have faulty minidsp.
Can't help you there, I've never made any changes "offline".
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post #248 of 255 Old 04-13-2015, 04:02 PM
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Quote:
Originally Posted by Alan P View Post
Hmmm....what mic are you using?

If the suckout is everywhere, you've either got a very unique room or there is a problem with your speakers or your measuring equipment. I would suspect the measuring equipment/setup.

You could try some nearfield measurements of your speakers just to rule out any issues with the speakers themselves.




Can't help you there, I've never made any changes "offline".
But have you made changes offline on plugin screen, then hooked up and hit sync?
Maybe that's the problem, maybe changes only stick if you make them while its synced.
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post #249 of 255 Old 04-13-2015, 04:05 PM
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No, as I said I have never worked "offline" with the MiniDSP...I have always been "synched" when making changes.
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post #250 of 255 Old 04-19-2015, 07:57 AM
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I'm getting closer to a good even output! The graph below shows a dip around 130hz. I was able to bump it 8hz in minidsp so it looks flatter now.

Ive read some posts that seem to frown on adding DBs with minidsp, but it worked well for me.

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post #251 of 255 Old 04-20-2015, 08:04 AM
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Well, if you boosted it and it worked, then it is not a true null. However, you have probably cut into your headroom. Have you noticed any loss of headroom since??
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post #252 of 255 Old 04-26-2015, 02:27 PM
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I've been searching all over the Internet for tips on using minidsp. I've seen a few posts and even pictures showing a low pass and high pass filter added.

I'm having a hard time grasping how they work and exactly what they do. I've seen the low pass filter put at 80hz with a 24db butter worth. I'm guessing that is making it so the sub does not output anything over 80hz. Is this a good thing to do? Or should I not worry about them other than making sure they are fully bypassed?
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post #253 of 255 Old 06-25-2015, 01:21 PM
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My question is very basic and relates to the settings on the miniDSP OpenDRC-AN

I have four subs, two in the front and two in the rear. The fronts are equi-distant from the MLP as are the rears. The fronts have one amp driving them as do the rears.

I want to use the miniDSP to set trims on the front 2 (collectively), trims on the back two (collectively), distance on the front two (collectively) and distance on the back two (collectively), BUT EQ all subs at once (one sub output from my pre pro).

I'm sure I am reading this wrong but I can't determine the physical setup. That is neither "stereo" nor "channel 1" nor "channel 2" seems to give me what I want. The manual says the stereo has dedicated paths for both channels and channel 1 and channel 2 only apply to channel 1 and channel two respectively..

What I think I need is for the channel 1 input to apply to both of the two output channel. That would allow me to set trims and distances individually on the two sets of outputs but EQ the one input.

Assistance requested.

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post #254 of 255 Old 06-25-2015, 05:44 PM
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Quote:
Originally Posted by audioguy View Post
My question is very basic and relates to the settings on the miniDSP OpenDRC-AN

I have four subs, two in the front and two in the rear. The fronts are equi-distant from the MLP as are the rears. The fronts have one amp driving them as do the rears.

I want to use the miniDSP to set trims on the front 2 (collectively), trims on the back two (collectively), distance on the front two (collectively) and distance on the back two (collectively), BUT EQ all subs at once (one sub output from my pre pro).

I'm sure I am reading this wrong but I can't determine the physical setup. That is neither "stereo" nor "channel 1" nor "channel 2" seems to give me what I want. The manual says the stereo has dedicated paths for both channels and channel 1 and channel 2 only apply to channel 1 and channel two respectively..

What I think I need is for the channel 1 input to apply to both of the two output channel. That would allow me to set trims and distances individually on the two sets of outputs but EQ the one input.

Assistance requested.
AVS member JerryAustin has a setup similar to yours and has written a guide on how to time align multiple subs in the following post here: **miniDSP DDRC-88A Official Thread**8-channel AI/AO Dirac Live in a box

Download the guide, print it out, pull up a chair, pour out your favorite beverage and have a good read.

Maranatz SR-7009, Oppo BPD-93, MTV 7000D, aTV, WDTV Live, Harmony 650 remote, KEF E301+T101, MiniDSP(2x4) & 10x10HD, Emotiva 2xXPA-5 (Gen2), Rythmik 2xF12G+2xF8, HiMedia Q16, LG 55EC9300 (on order).
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post #255 of 255 Old 06-26-2015, 07:05 AM - Thread Starter
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Quote:
Originally Posted by audioguy View Post
My question is very basic and relates to the settings on the miniDSP OpenDRC-AN
While I don't own and haven't worked with the OpenDRC-AN, it seems that the situation you describe is similar to the 4-sub setup described in my tutorial.

I'd use one of the outputs for the front subs, and the other output for the back subs. If your AVR has a single output, use a Y-splitter to drive both of the MiniDSP inputs.

You have to set exactly the same FIR parameters on all paths if you want to EQ the subs all at once. I am not familiar with the plugins for the OpenDRC but presumably there is a function to copy FIR parameters from one block to another. The only difference between the two paths will be the trims and distances.

I am not sure of the differences between stereo mode and L / R modes in the OpenDRC-AN but presumably stereo allows having different FIR settings on different outputs. If a mono setting allows using both output, it may be simpler (a single FIR box?) but if you must use stereo to get the two outputs working, then the FIR parameters in the two boxes should be identical.

I hope this helps!

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