Nearfield Ported MBM for Increased Mid-Bass Tactile Response - Page 54 - AVS Forum | Home Theater Discussions And Reviews
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post #1591 of 3151 Old 12-27-2016, 07:26 AM
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Originally Posted by Brazle View Post
Hey bouf, I'm curious what you have in mind for your PA380s. If you stick with sealed would the cab size be ~0.7 cu ft as recommended on parts-express? Or different?



I plan on using a couple PA380s in ported cabs along with a UM18 in a large ported cab. I have one 380 already, currently testing it out in a ported 3 cu ft test box (I've posted a couple times in my build thread and the VibSensor thread about it). And i plan on trying a couple of cab sizes to compare. So far it seems like a very capable MBM for my needs. First tests seem a bit muddy/loose. Good response after some PEQ adjustments in my inuke DSP but could use more punch. Could be the large cab size. I plan on bringing it down to 1.5-2.0 cu ft for further testing.


I'd try and squeeze it into 1 cu ft for sealed and 2 tuned @ ~31hz for ported.


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post #1592 of 3151 Old 12-27-2016, 04:40 PM
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Well I ordered 2 pa380s. Should be here by the end of the week. I'm going to design the ported boxes tonight - something along the lines of 18w x 22h x 10d with a slotted port or some sort.


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post #1593 of 3151 Old 12-27-2016, 06:51 PM
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Originally Posted by bouf0010 View Post
I'd try and squeeze it into 1 cu ft for sealed and 2 tuned @ ~31hz for ported.


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Maybe try tuning a bit higher, like >40Hz for MBM use IMHO.
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post #1594 of 3151 Old 12-27-2016, 08:05 PM
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Originally Posted by Marc Alexander View Post
Maybe try tuning a bit higher, like >40Hz for MBM use IMHO.


Thanks for the tip! It does look much better tuned at 45hz - plus I'll be able to throw more power at it without over excursion.


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post #1595 of 3151 Old 12-28-2016, 05:58 AM
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I think I am going to pick one of the Behringers up. ( Need to stay off this forum) I have a PB-1000 that handles the low stuff in my tiny room but lacking midbass.

Question about connectivity of the 1200D. I have 2 RCA Sub outputs on my receiver. One will go to the SVS. Would it be best to connect up only one XLR input on the Behringer or both? Say with a Y splitter? One RCA male out of the receiver splitting into both XLR inputs for more gain?

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post #1596 of 3151 Old 12-29-2016, 02:53 AM
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Quote:
Originally Posted by vlad335 View Post
Question about connectivity of the 1200D. I have 2 RCA Sub outputs on my receiver. One will go to the SVS. Would it be best to connect up only one XLR input on the Behringer or both? Say with a Y splitter? One RCA male out of the receiver splitting into both XLR inputs for more gain?
Hey vlad, there have been quite a few posts on this question in this thread with varying opinions and results. It seems like results vary depending on your setup (receiver, subs used, room acoustics, sub distance to MLP, etc). Your best bet might be to try as many configurations as possible to see what works best for you.

What receiver do you have? What will your room configuration be? (Room size, sub distances from MLP)

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post #1597 of 3151 Old 12-29-2016, 04:50 AM
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Quote:
Originally Posted by vlad335 View Post
I think I am going to pick one of the Behringers up. ( Need to stay off this forum) I have a PB-1000 that handles the low stuff in my tiny room but lacking midbass.

Question about connectivity of the 1200D. I have 2 RCA Sub outputs on my receiver. One will go to the SVS. Would it be best to connect up only one XLR input on the Behringer or both? Say with a Y splitter? One RCA male out of the receiver splitting into both XLR inputs for more gain?
I don't think you need more gain. For nearfield 1200D you will prob have its volume at 9-10 o'clock. That leaves plenty of headroom.

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post #1598 of 3151 Old 12-30-2016, 04:22 PM
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I didn't want my two little 1200D's sitting behind my seats by themselves. It was also mentioned they perform better when raised off the floor. In accordance with AVS peer-pressure compliance, these MBM "stands" were picked up today and are en route to Texas. Figured I might as well join the near-field insanity.



Not to worry, they will be banded, wrapped, and palleted at the shipping depot.
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post #1599 of 3151 Old 12-30-2016, 04:31 PM
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Originally Posted by Molon_Labe View Post
I didn't want my two little 1200D's sitting behind my seats by themselves. It was also mentioned they perform better when raised off the floor. In accordance with AVS peer-pressure compliance, these MBM "stands" were picked up today and are en route to Texas. Figured I might as well join the near-field insanity.



Not to worry, they will be banded, wrapped, and palleted at the shipping depot.
Awesome! What are those? They look beastly.

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post #1600 of 3151 Old 12-30-2016, 05:54 PM
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Quote:
Originally Posted by Molon_Labe View Post
I didn't want my two little 1200D's sitting behind my seats by themselves. It was also mentioned they perform better when raised off the floor. In accordance with AVS peer-pressure compliance, these MBM "stands" were picked up today and are en route to Texas. Figured I might as well join the near-field insanity.



Not to worry, they will be banded, wrapped, and palleted at the shipping depot.

Chris, you're a beast! You obviously need to get 2 more 1200D's for aesthetic purposes and all.
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post #1601 of 3151 Old 12-30-2016, 07:10 PM
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Quote:
Originally Posted by Molon_Labe View Post
I didn't want my two little 1200D's sitting behind my seats by themselves. It was also mentioned they perform better when raised off the floor. In accordance with AVS peer-pressure compliance, these MBM "stands" were picked up today and are en route to Texas. Figured I might as well join the near-field insanity.



Not to worry, they will be banded, wrapped, and palleted at the shipping depot.
Are those S2's?
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post #1602 of 3151 Old 12-31-2016, 07:11 AM
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Originally Posted by Molon_Labe View Post
They are DIY cabs with SI-18 drivers. They won't have near the output of the S2 but should do nicely in nearfield duties.
I'd say so.... quad 18's for nearfield? Yes please!

Plus two of the 1200's?

I thought my single 18 and single 1200 was big time for near field..
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post #1603 of 3151 Old 12-31-2016, 10:38 AM
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Originally Posted by Molon_Labe View Post
They are DIY cabs with SI-18 drivers. They won't have near the output of the S2 but should do nicely in nearfield duties.
@Molon_Labe did you ever post your thoughts on the 1200d's yet...I dont recall seeing what you thought of them.
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post #1604 of 3151 Old 12-31-2016, 11:21 AM
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@Molon_Labe did you ever post your thoughts on the 1200d's yet...I dont recall seeing what you thought of them.
I still haven't used them. I had been kicking around the idea of doing near-field subs, so I moved forward with it. I didn't want to integrate the 1200d's with REW, miniDSP 2x4, etc to only have to remeasure and re-calibrate all over again. It also lessens the impact with the wife. The A/B will be much more apparent with it all online at the same time which reduces my explanation to the misses
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post #1605 of 3151 Old 12-31-2016, 05:10 PM
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Originally Posted by Molon_Labe View Post
I still haven't used them. I had been kicking around the idea of doing near-field subs, so I moved forward with it. I didn't want to integrate the 1200d's with REW, miniDSP 2x4, etc to only have to remeasure and re-calibrate all over again. It also lessens the impact with the wife. The A/B will be much more apparent with it all online at the same time which reduces my explanation to the misses
This is the first time I have ever heard of buying two huge subs to better justify two very small ones to your wife.
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post #1606 of 3151 Old 12-31-2016, 05:46 PM
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They're not small ones. They're the other part of the big ones.

Looks like fun!
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post #1607 of 3151 Old 01-01-2017, 03:29 PM
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Greetings: After reading this entire forum, I decided to add the 1200's to my system. I ran some test signals through them, shut everything off, and later attempted to watch "The Force Awakens." Problem: no response at all from the 1200's. I verified all connections, yes, power is on (no green light indicating it's receiving a signal, however, only the amber power light). I also double checked connections. I'm running the signal feeding it through a splitter on the sub pre out of my Yamaha 3060. I tried running it without the splitter, but it didn't help. I also tried re running the test signals from the 3060, nothing this time. I also tried a different RCA to XLR adapter, but it didn't help. Any suggestions gratefully accepted!


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post #1608 of 3151 Old 01-01-2017, 05:10 PM
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The amber power light will stay on when the sub is switched on. The green signal light will only illuminate when you're feeding it enough input signal to activate the light. Depending on how your gain structure is you may never see the green light. I only see the green light barely flicker when I'm cranking the master volume pretty good and have a good kick drum with music or explosions during a movie. As long as you can hear sound coming out of the driver and see the amber power light all is well.

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post #1609 of 3151 Old 01-01-2017, 05:13 PM
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Mine is on its way back from a warranty repair, so I may not be the best one to answer.
If the power light is on but it's not getting a signal, you may just need to increase the sub out setting on your AVR. You'll need to reduce the gain on your other subs appropriately, of course.
And try reseating the cables at both ends. Sometimes it's something simple (just not very often ).
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post #1610 of 3151 Old 01-01-2017, 06:18 PM
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Originally Posted by Secret Squirrel View Post
The amber power light will stay on when the sub is switched on. The green signal light will only illuminate when you're feeding it enough input signal to activate the light. Depending on how your gain structure is you may never see the green light. I only see the green light barely flicker when I'm cranking the master volume pretty good and have a good kick drum with music or explosions during a movie. As long as you can hear sound coming out of the driver and see the amber power light all is well.

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Thanks. It's beginning to look like i had signal all along, just not enough to activate the green light. Nothing at all on the seat backs though. I'll try increasing the signal being sent via the receiver. Thanks for the help!


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post #1611 of 3151 Old 01-01-2017, 06:20 PM
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Mine is on its way back from a warranty repair, so I may not be the best one to answer.
If the power light is on but it's not getting a signal, you may just need to increase the sub out setting on your AVR. You'll need to reduce the gain on your other subs appropriately, of course.
And try reseating the cables at both ends. Sometimes it's something simple (just not very often ).
Michael


Appreciate the help. I am going to try that and hope I get some indication that it's actually outputting midbass at the back of the chair. Thanks again.


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post #1612 of 3151 Old 01-01-2017, 06:57 PM
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I'm wondering now if I need to increase it well beyond the levels of the other speakers. I had set it on 75db to match everything else, but apparently, it has to be quite a bit louder.


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post #1613 of 3151 Old 01-01-2017, 07:16 PM
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You may need to adjust the gain or move the MBM to get the most out of it. Your room size and shape will have a lot to do with this.

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post #1614 of 3151 Old 01-02-2017, 06:06 AM - Thread Starter
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I'm wondering now if I need to increase it well beyond the levels of the other speakers. I had set it on 75db to match everything else, but apparently, it has to be quite a bit louder.


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Are you saying that it is outputting sound at the appropriate levels, but you just can't feel anything? Are they right next to the LP?

Do you have an fr sweep of before and after?

You should also use vibsensor to measure TR.
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post #1615 of 3151 Old 01-02-2017, 06:20 AM
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Originally Posted by Secret Squirrel View Post
You may need to adjust the gain or move the MBM to get the most out of it. Your room size and shape will have a lot to do with this.

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Right now, it's less than 2 feet behind the listening position, just below shoulder level. I have a sealed rectangular room, 16x24x8.


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post #1616 of 3151 Old 01-02-2017, 06:24 AM
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Originally Posted by dominguez1 View Post
Are you saying that it is outputting sound at the appropriate levels, but you just can't feel anything? Are they right next to the LP?



Do you have an fr sweep of before and after?



You should also use vibsensor to measure TR.


Hi Dom, yes, I'm getting zero impact. I thought it was because no green light was coming on the 1200, and that the signal was too weak. It's less than 2 feet behind the LP, just below shoulder level. I do have them flipped, so I could try normal orientation and see what happens. Thanks for your thoughts.


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post #1617 of 3151 Old 01-02-2017, 06:34 AM - Thread Starter
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Hi Dom, yes, I'm getting zero impact. I thought it was because no green light was coming on the 1200, and that the signal was too weak. It's less than 2 feet behind the LP, just below shoulder level. I do have them flipped, so I could try normal orientation and see what happens. Thanks for your thoughts.


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Can you hear a difference at least? I would think that should be noticeable.

Bass boost on? What frequency are you boosting?

I would play with the bass boost, boost freq, and phase until you can feel a difference. Then increase the gain if you want more.

Don't worry about fr for now, just focus on TR.
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post #1618 of 3151 Old 01-02-2017, 07:16 AM
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Originally Posted by dominguez1 View Post
Can you hear a difference at least? I would think that should be noticeable.
You might also not feel anything because of the construction of your seat.
But it should definitely sound like a sub.
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post #1619 of 3151 Old 01-02-2017, 08:18 AM
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Originally Posted by Molon_Labe View Post
@healthnut - Do you have REW? Pull some measurements with and without the MBM and post your graphs.


I don't have REW, or a calibration mike, but I might be investing in this at some point. At this point, I'm not as concerned about measurements as what I'm not hearing or feeling.


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post #1620 of 3151 Old 01-02-2017, 08:20 AM
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Quote:
Originally Posted by dominguez1 View Post
Can you hear a difference at least? I would think that should be noticeable.



Bass boost on? What frequency are you boosting?



I would play with the bass boost, boost freq, and phase until you can feel a difference. Then increase the gain if you want more.



Don't worry about fr for now, just focus on TR.


Bass boost is on (60). Haven't done anything with phase, but I will try boosting the gin and playing with phase and see what happens. Thanks for the suggestions.


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