Burak's Dual ported SI HST 18 build - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 29 Old 03-06-2017, 06:19 AM - Thread Starter
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Burak's Dual ported SI HST 18 build

After PM ing with @LTD02 for a long time, I finally pulled the trigger on building 2 ported HST18s. I am building 11 Cubic feet ported cabs tuned to 17hz. The subs will be powered by A14K from Bossobass.
The room is a dedicated theater room and the dimensions are 27x14.5x9'. I will use Duratex to finish the boxes as they will be placed behind an AT screen in the room. The subs will complement the Fusion 15 s that I recently built.

Here is the design. The only difference is, the width will be 25.5" instead of 24".



Here are the progress pictures from yesterday. I am using Titebond glue and nail gun with brad nailers to speed up the process. I have sealed the inside edges with acoustical caulk and will use 2 thick coats of Duratex outside.







ports will be 3" high

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post #2 of 29 Old 03-06-2017, 07:59 AM
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Nice progress, you're moving quickly! Also, nice garage and workspace there. These things are going to be serious business with that A14K!
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post #3 of 29 Old 03-06-2017, 04:51 PM - Thread Starter
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Thank you, the garage is much more organized normally but since I am also building my theater room, it has been pretty messy for the last 2 months.
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post #4 of 29 Old 03-06-2017, 07:03 PM
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Nice looking so far!
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post #5 of 29 Old 03-07-2017, 02:37 AM
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I am assuming you will be adding lots of bracing to that pictured design above?
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post #6 of 29 Old 03-07-2017, 05:03 AM - Thread Starter
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chrapladm, absolutely right. that is what I plan to do.
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post #7 of 29 Old 03-07-2017, 05:09 AM - Thread Starter
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some more progress photos from last night. I plan to take care of the bracing tonight.





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post #8 of 29 Old 03-07-2017, 06:07 AM
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What kind of wood are you using? Looks nice!

HT setup: Vizio 50" 4K | Xbox & PS3 | Pioneer Elite VSX-94TX | Bose 701 towers (V1) | JBL S Center | Def Tech Reference SuperCube & DIY Nearfield cabinet ported UM18 dual ported PA380 ULF+MBM
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post #9 of 29 Old 03-07-2017, 12:54 PM - Thread Starter
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It is 3/4" birch plywood from HD. I use it instead of MDF as I find it less messy and it is easier to put screws in without messing it up.
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post #10 of 29 Old 03-08-2017, 05:44 AM - Thread Starter
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Almost done with the bracing. I plan to put 4 strips from the back wall to the front wall around where the sub gets mounted. Can you please let me know if the bracing will be sufficient?

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post #11 of 29 Old 03-08-2017, 04:03 PM
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From the looks of this, your vertical strips are gonna need to be cut down a 3/4 (three quarter inch) What ever is the thickness of your wood, in order for your top board piece to go on properly. You may want to take a look at that. Dual HST's are gonna KILL.. I have em in Mini Martys.. I see you are getting the Bosso amplifier.. SWEET.. !!
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post #12 of 29 Old 03-08-2017, 04:20 PM
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Quote:
Originally Posted by Phonzo07 View Post
From the looks of this, your vertical strips are gonna need to be cut down a 3/4 (three quarter inch) What ever is the thickness of your wood, in order for your top board piece to go on properly. You may want to take a look at that. Dual HST's are gonna KILL.. I have em in Mini Martys.. I see you are getting the Bosso amplifier.. SWEET.. !!
Unless his top piece is just going to sit on top of everything and not sit flush with pieces. But yep these are gunna rock.

EDIT: Nevermind I see his drawing you are right it is supposed to be flush.
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post #13 of 29 Old 03-08-2017, 06:08 PM - Thread Starter
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@phonzo07 you rock! Yes, looks like I have to cut 4 pcs by 3/4". By the way I have added some more bracing...
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post #14 of 29 Old 03-09-2017, 06:16 AM
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Quote:
Originally Posted by gogunbaba View Post
@phonzo07 you rock! Yes, looks like I have to cut 4 pcs by 3/4". By the way I have added some more bracing...
No Problem sirr, I'm pretty sure you wont be disappointed with the outcome. Just make sure the bracing is good, you do not want any rattling, or noise from the box. It can get very irritating. I know from experience. The amount of air these push is insane. I'm very curious to hear or see what the Bossobass amps will do with those. I've read a lot about them. I have Inuke 6Ks and know these drivers can take more. Good luck with the build. This is a great community (AVS FORUM). I've learned ALOT.. and also spent ALOT..
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post #15 of 29 Old 03-17-2017, 07:36 AM - Thread Starter
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I finally had time last night to come back to this project and make progress. I cut the driver holes and glued them together. The plan is to finish assembly tonight, give it a couple of coat of Duratex tomorrow and fire it up on Sunday.

I am curious to know if anyone has used these handles in their build to make it easier to move these giant enclosures. is it ok to install them?



https://www.parts-express.com/penn-e...andle--260-705
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post #16 of 29 Old 03-17-2017, 07:52 PM - Thread Starter
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Little more progress tonight. The front baffle is installed, put some foam inside and the first coat of duratex is done.
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post #17 of 29 Old 03-19-2017, 08:14 AM - Thread Starter
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I finally finished it. I am going to describe A14k HST18 combo with one word "effortless". I set up the high pass filter as 17db. So far with the levels I normally listen to, I only saw 5 green lights in the front panel of the amp. This thing shakes the door of the theater room.

I only built one to see the performance and I can assure you that I will complete the 2nd cabinet asap. I am loving this thing...
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post #18 of 29 Old 03-19-2017, 08:49 PM
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Quote:
Originally Posted by gogunbaba View Post
I finally finished it. I am going to describe A14k HST18 combo with one word "effortless". I set up the high pass filter as 17db. So far with the levels I normally listen to, I only saw 5 green lights in the front panel of the amp. This thing shakes the door of the theater room.

I only built one to see the performance and I can assure you that I will complete the 2nd cabinet asap. I am loving this thing...
Awesome! I'm glad you got one driver/system fired up. ...and that's with only one of your two HST-18 mkII monsters. Adding the second driver will double your surface area and double your power for a very big increase in output.
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post #19 of 29 Old 03-19-2017, 10:42 PM
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Nice looking setup Burak, well done.
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post #20 of 29 Old 03-19-2017, 11:24 PM
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Nice build. That should pound in your HT.
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post #21 of 29 Old 03-26-2017, 06:21 AM - Thread Starter
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2nd one should be up and running tonight, just waiting for the duratex paint to dry. I am glad that I went with birch plywood option. I can't even imagine how much heavier the enclosure would be had I gone with the mdf option.
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post #22 of 29 Old 03-27-2017, 07:23 AM
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Those are gonna POUND.. I have 2014 HST's and I bet the newer ones has to be better. Great Job

If you KRANK it.. They will Listen..
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post #23 of 29 Old 03-27-2017, 08:20 AM - Thread Starter
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This is how I placed them in the room. I am learning how to use rew with UMIk mic. I have been reading for about 3 weeks now and have my first shot at measuring them last night... I haven't done any EQ adjustments on my mini DSP 2X4 HD yet other then setting up the high pass filter at16hz and butterworth 24db/oct.
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post #24 of 29 Old 03-27-2017, 09:30 PM
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With that low-end prowess below 30 Hz it must have a hefty weight to the sound (always a good thing).
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post #25 of 29 Old 03-28-2017, 07:11 PM - Thread Starter
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I wanted give these guys a little workout this evening. The microphone is setup at the MLP which is 18ft from the sub? The door for the room is custom built solid core door.



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post #26 of 29 Old 03-28-2017, 09:34 PM
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Quote:
Originally Posted by gogunbaba View Post
I wanted give these guys a little workout this evening. The microphone is setup at the MLP which is 18ft from the sub? The door for the room is custom built solid core door.



https://youtu.be/5MyXbnxj9fE
Awesome. Looks like you're getting into the first legs of the HST-18 mkII's performance envelope.
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post #27 of 29 Old 04-04-2017, 08:33 AM - Thread Starter
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We had some time to work on EQing up the HSTs this weekend. I would like to thank @Shreds for all of his help. He absolutely knows his stuff and what he did with my system made a tremendous amount of difference.

I have attached the file with my HSTs and mains running together. In this graph, Audyssey is off and the mains were not EQd.

Last night I took a shot at adding a 3rd sub. This was my first attempt on using REW and mini dsp 2x4HD to get better results. I wanted to see if I could add my sealed Maelstrom X with success. I am in the process of building ported enclosures for the Maelstroms but have yet to start.

Attached is the comparison of 2 HSTs infront(green) and 2HSTs infront+MaelX(purple) at the rear right corner.

I will work on adding my 4th sub tonight.
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post #28 of 29 Old 04-10-2017, 01:42 PM
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I'm really considering building 4 of these and am curious how you feel about the midbass slam. These drivers are made for down low and all the threads that I have read about people putting these into sealed enclosures were saying that they were lacking in the 50hz area.

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Pre-Pro: Yamaha CX-A5100, Amp: D-Sonic M3-5400-7, Subs: 3 JTR Orbit Shifter LFU's, LCR: DIYSG F-15 Sentinels, Surrounds: Tannoy 802's, 4k player: Panasonic UB-900, 4k Gaming PC
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post #29 of 29 Old 04-10-2017, 02:13 PM - Thread Starter
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Hi David,

I am not a subwoofer expert or have experience with many other brands. I would say that they don't miss the mid bass slam but they are very strong down low. Once I finished building my ported enclosures for maelstroms, I am planning on building mbm s for behind the rear seats for tactile feeling. The bass in my room right now is very satisfying and I have yet to add and tune the 4th sub.

Also, my room is 3300?cubic feet.
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