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post #1 of 30 Old 07-28-2018, 01:12 PM - Thread Starter
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4cu sealed knockdown converted into ported

Guys, thought I might as well share this. A long while ago I purchased 2 sealed 4cu knockdown cabinets to go with 2 sealed cabs for my HS24s, well I went ported instead and for the longest the knockdown cabinets sat around doing nothing....Until now. I installed 2 4" straight ports, which are 6" in length, that gives me a tune of 43Hz give or take. I haven't connected them yet, but I will soon. I'll post REW measurements when I get everything in order.

Big thanks to @VegaMan for clearing up a mistake I made in calculating round port lengths. This was my first time ever dealing with round ports so I was off base until Vegaman chimed in
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post #2 of 30 Old 07-28-2018, 01:36 PM - Thread Starter
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BTW, these will be used as MBMs. I'll be adding 6-8 more MBMs which I'll build cabs for. A total of 4 upfront and two behind each row of seating.
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post #3 of 30 Old 07-28-2018, 03:56 PM
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I don't want to hijack your thread, but I had the same idea as you and made my MBM's by re-purposeing a pair of sealed 3.0 cu/ft flat packs. I used two 3" aeroports in each box and used the the dayton PA380 15". They are ported to 38hz and sound great! I am excited to hear how your 4.0 cu/ft MBM's turn out.
-Paul
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post #4 of 30 Old 07-28-2018, 04:19 PM
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Happy to help and glad to see it coming to fruition. Box models look decent for what you're aiming for, look forward to your results and impressions.
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post #5 of 30 Old 07-29-2018, 08:57 AM - Thread Starter
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Quote:
Originally Posted by Ming696 View Post
I don't want to hijack your thread, but I had the same idea as you and made my MBM's by re-purposeing a pair of sealed 3.0 cu/ft flat packs. I used two 3" aeroports in each box and used the the dayton PA380 15". They are ported to 38hz and sound great! I am excited to hear how your 4.0 cu/ft MBM's turn out.
-Paul
Those boxes look excellent! Obviously you can tell I haven't paint or lined the inside of my cabs. I probably won't paint until I have everything dialed in. Problem is, I've had all types of issues trying to get measurements. When I connected my umik it was only registering as an generic usb audio device in windows. I took it apart and discovered that the ground wire was disconnected from the board. Once I got that cleared up window recognized the umik but as, but with a gain of 24 That shouldn't be because my dip switches are set to 0db and the sensitivity file was adjusted. My old laptop reflected the the umik with a 0db gain and everything was fine, but last week I got a new laptop. And to mention the umik was dropped twice by my wife I may have to end up getting a new one or getting one from the classifieds.

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post #6 of 30 Old 07-29-2018, 11:47 AM
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Originally Posted by johnson636 View Post
Those boxes look excellent!
Thank you, they've been through a couple iterations. First was sealed with Dayton DVC385-88, then with the DVC's and passive radiators. You can see in the unlined pic the back baffle has another cutout that I just glued on another MDF layer to cover up. Now they are MBM's. I want to build two 18" versions using the PA460 and 4 cu/ft flat packs and port them the same way. That's why your build has me excited! I don't have any measuring equipment, but by ear they sound great and I know the 18's should be even better. Good luck with your Umik.
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post #7 of 30 Old 07-29-2018, 04:55 PM - Thread Starter
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I have something really bad going on at my MLP @ 65HZ This wasn't present before I put drywall up in the the room where the subs and speakers are. Only the PA460s are going through the minidsp.
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post #8 of 30 Old 07-29-2018, 05:07 PM
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post #9 of 30 Old 07-29-2018, 08:03 PM
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I have considered doing the same with my flat packs. I purchased two PA460s because I had a couple extra flat packs. Following to see your results.

Also, they look good! Can you post a link of the port you used?

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post #10 of 30 Old 07-29-2018, 08:27 PM - Thread Starter
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Have you tried playing around with the distance for your subs in your avr. Then running rew again we’re do you cross your subs over at
Subs are crossed at 80Hz. I haven't played with the distances in the AVR. When I get the opportunity, I'll include the PA460s in an audyssey run, then set a HPF with the mini.

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I have considered doing the same with my flat packs. I purchased two PA460s because I had a couple extra flat packs. Following to see your results.

Also, they look good! Can you post a link of the port you used?
Clearance is not an issue at all. I have 2 more PA460s that I'll be building boxes for. Probably 5-6cu. Also, my plan is to put at least two behind each row of seating, especially the rear row where I'm down about 10db between 40-60Hz...It's in a null

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post #11 of 30 Old 08-11-2018, 07:01 AM - Thread Starter
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Can you guess what this is?
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post #12 of 30 Old 08-11-2018, 08:05 AM - Thread Starter
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Give up?

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post #13 of 30 Old 08-11-2018, 08:37 AM - Thread Starter
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Ok, ok. It's a Titan flat pack loaded with PA460
4fit?, nicnic and tiger8mush like this.

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post #14 of 30 Old 08-11-2018, 01:36 PM - Thread Starter
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Second one coming along nicely. The only way to make this work is to modify the bracing so that the PA460 has enough clearance to fit.
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post #15 of 30 Old 08-11-2018, 01:43 PM
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Once I got that cleared up window recognized the umik but as, but with a gain of 24
That's normal. Rarely if-ever does it set it correctly. It really means nothing regardless, as the Sens-Fac in the cal file is what REW uses for SPL calibration.
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post #16 of 30 Old 08-11-2018, 01:51 PM - Thread Starter
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That's normal. Rarely if-ever does it set it correctly. It really means nothing regardless, as the Sens-Fac in the cal file is what REW uses for SPL calibration.
You mean I've been wrecking my brain for nothing

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post #17 of 30 Old 08-11-2018, 02:17 PM
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You mean I've been wrecking my brain for nothing


Lol yes, I did the same thing ...


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post #18 of 30 Old 08-11-2018, 03:22 PM - Thread Starter
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I mean I've taken my umik apart, desoldered and resoldered the wires at least twice

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post #19 of 30 Old 08-11-2018, 06:09 PM - Thread Starter
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18" version of the Titan
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post #20 of 30 Old 08-11-2018, 08:56 PM
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So are you going active now or building a crossove
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post #21 of 30 Old 08-11-2018, 09:46 PM - Thread Starter
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So are you going active now or building a crossove
Just joking on the titans. I wouldn't know the first thing about building a passive crossover If all goes to plan, I'll be building SC-2150 clones using the passive network for the HF and Mid section and active for the dual 18s.

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post #22 of 30 Old 08-12-2018, 11:14 AM - Thread Starter
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The addition of these two 4 cuft MBMs would make 4 upfront with 6 more to go Now I'm just waiting on the precision ports to get here.
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post #23 of 30 Old 08-17-2018, 09:45 AM - Thread Starter
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Got the precision ports cut, put together, and installed. I used Gorilla tape for a temp install until I'm confident everything is A-OK. The tune on these is 35Hz so the PA460s should come alive. I'll be testing these, along with the 2 I did a few weeks ago, tonight with Avengers: Infinity War
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post #24 of 30 Old 09-10-2018, 08:44 AM - Thread Starter
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I was listening to the below bass drop demo using only the PA460 in the 4 cube boxes and man do they shine from 40HZ to 100Hz


And to think I'll be adding 10 more
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post #25 of 30 Old 01-07-2019, 11:18 AM
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Originally Posted by johnson636 View Post
I was listening to the below bass drop demo using only the PA460 in the 4 cube boxes and man do they shine from 40HZ to 100Hz

http://www.youtube.com/watch?v=cf6S-uErp2M

And to think I'll be adding 10 more
Any updates on how this worked out and what you ended up doing?

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post #26 of 30 Old 01-07-2019, 01:09 PM - Thread Starter
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Any updates on how this worked out and what you ended up doing?
I ended up building two more enclosures that mimic the 4cu ported cabs. I'll be building 4 more soon.

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post #27 of 30 Old 01-08-2019, 09:35 AM
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I ended up building two more enclosures that mimic the 4cu ported cabs. I'll be building 4 more soon.
I assume the PA460's didn't work out in the Titan MBM box. I'm getting ready to add ports to two of my 4cf box's I had laying around and put PA460's in them. Do you have any suggestions or things you would change since you've already done it or is it as straight forward as you show in your first post?

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post #28 of 30 Old 01-09-2019, 05:17 AM - Thread Starter
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Originally Posted by ShotFire View Post
I assume the PA460's didn't work out in the Titan MBM box. I'm getting ready to add ports to two of my 4cf box's I had laying around and put PA460's in them. Do you have any suggestions or things you would change since you've already done it or is it as straight forward as you show in your first post?
Unfortunately the Titan mbm enclosures didn't work out. I'll be building more just as I did the two previous enclosure. I think you'll do a great job adding the ports to your cabs as it is a pretty straight forward procedure. What tune are you planning for you enclosures?

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post #29 of 30 Old 01-09-2019, 09:12 AM
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Unfortunately the Titan mbm enclosures didn't work out. I'll be building more just as I did the two previous enclosure. I think you'll do a great job adding the ports to your cabs as it is a pretty straight forward procedure. What tune are you planning for you enclosures?
I'm going to initially do the 6" ports like you did. Yesterday I was playing with WinISD but this is the first time I've used it and at this point I have no idea what I'm doing. I created a 4cf box with the 460 in it but when I change the port length I don't see anything changing, I have a lot to learn.

Are you still using the 6" length ports?

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post #30 of 30 Old 01-10-2019, 05:46 AM - Thread Starter
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Originally Posted by ShotFire View Post
I'm going to initially do the 6" ports like you did. Yesterday I was playing with WinISD but this is the first time I've used it and at this point I have no idea what I'm doing. I created a 4cf box with the 460 in it but when I change the port length I don't see anything changing, I have a lot to learn.

Are you still using the 6" length ports?
I'm still using the 6" length ports. What version of winISD are you using? I'm using v0.7.0.950 and it doesn't allow me to change the port length. I can change the port diameter.

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