4-18 cubic ft. flared slot ported build using 4-B&C 21DS115-4 Drivers - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 403 Unread 03-09-2017, 12:54 PM - Thread Starter
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4-18 cubic ft. flared slot ported build using 4-B&C 21DS115-4 Drivers

Boxes: 4 18 cubic ft. MDF Flared slot ported boxes



There tuned to 15.33 hz.







Drivers: B&C21DS115-4 ohm drivers







This all started a while back.... I reached out to LDT02 and was asking for his help with the Dayton Ultimax 18's and was going with those in a slot ported box. Then once I started building my Titan-615 LCR build I stopped at @mtg90 house to pick up the crossover boards and we started talking about what drivers I should use. He suggested the B&C driver and after a few messages and phone calls he modeled the new driver B&C just released after seeing what the SW version would do via winisd that parts express sold. This new driver made 2-3 db more across the board compared to the SW driver and was just a little more money. So since I was this far into it I figured why not buy these new B&C21DS115-4 drivers. These will make some serious noise as you can see from the graph below.







These new drivers are also very sensitive and will take less power to drive them which is a huge plus!!!







I'll be running the drivers with my inuke 6,000's and the will be a perfect match with power.







Here's a few graphs of where i was in my room and were I will be.

Yellow and blue is the new setup and pink and red is the old setup.
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Last edited by eng-399; 05-04-2017 at 08:04 AM.
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post #2 of 403 Unread 03-09-2017, 12:54 PM - Thread Starter
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post #3 of 403 Unread 03-09-2017, 12:55 PM - Thread Starter
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4-18 cubic ft. flared slot ported build using 4-B&C 21DS115-4 Drivers

Numbers

The box has a 15.33 hz tune to it. The slot port is 45 inches long and 24.5 inches wide.

15.30 hz. 131 db.

20 hz. 129 db

25 hz. 129 db

30hz. 130 db

40hz. 132db

50hz. 133 db

60 hz. 134 db

70hz. 135db

80hz. 136db. I'll cross then here most likely

90hz. 137db

100hz. 138db

110hz. 138db

120hz. 140db


My 6-15" legacy drivers numbers

10hz. 107db
15hz. 115 db
20hz. 120db
30hz. 125db
40hz. 128db
50hz. 130db
60hz. 130db
And 130 db on up from there.

It should be like having 2 JTR 4,000's in the room but with more bass than just those two cabinets if my measurements are right.

Sketch up from Matt


Last edited by eng-399; 05-04-2017 at 08:03 AM.
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post #4 of 403 Unread 03-09-2017, 01:45 PM
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Subscribed. Can't wait to see these done

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post #5 of 403 Unread 03-09-2017, 02:28 PM
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Sweet. I bet these are going to sound very clean as well.
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post #6 of 403 Unread 03-09-2017, 02:37 PM
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Just curious, what would these do in large sealed boxes... 6-10cu ft?
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post #7 of 403 Unread 03-09-2017, 03:20 PM
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Subscribed and looking forward to the build and your impressions. Just when I was thinking of going with 2 JTR 4000ULF's... I could potentially do 6 of these (4 in front and 2 in back) instead and still come out ahead. Not that I'd really NEED 6, but it'd be fun!


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post #8 of 403 Unread 03-09-2017, 03:59 PM
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Nice, that's gonna be awesome. The 21ds look legit.
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post #9 of 403 Unread 03-09-2017, 04:00 PM
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Quote:
Originally Posted by eng-399 View Post
Numbers

The box has a 15.33 hz tune to it. The slot port is 45 inches long and 24.5 inches wide.

15.30 hz. 131 db.

20 hz. 129 db

25 hz. 129 db

30hz. 130 db

40hz. 132db

50hz. 133 db

60 hz. 134 db

70hz. 135db

80hz. 136db. I'll cross then here most likely

90hz. 137db

100hz. 138db

110hz. 138db

120hz. 140db


My 6-15" legacy drivers numbers

10hz. 107db
15hz. 115 db
20hz. 120db
30hz. 125db
40hz. 128db
50hz. 130db
60hz. 130db
And 130 db on up from there.

It should be like having 2 JTR 4,000's in the room but with more bass than just those two cabinets if my measurements are right.

Sketch up from Matt
Nice! I'm glad you went with the DS115...total beast of a driver and similarly priced to the Sw115. I'll be watching this one for sure. I have a trio of 21SW152 that I'm thinking of ported boxes for as well with a similar tune. I'll probably pick up a fourth... Have to have symetry lol. How are those titans treating you?

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post #10 of 403 Unread 03-09-2017, 04:04 PM
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Also, tell us more about that port flare at the beginning of the port... Inquiring minds want to know 😁

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post #11 of 403 Unread 03-09-2017, 04:21 PM
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Jesus Mother of God. Subbed.

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Dedicated HT | FRONTS: Sonus Faber Venere 1.5 CENTER: Sonus Faber Venere Centre SURROUNDS: Sonus Faber Venere Walls RECEIVER: Marantz SR-7010 SUBWOOFERS: DUAL 18" Dayton RSS460HO Custom Build | Behringer iNuke 6000DSP | Velodyne SMS-1 DISPLAY: JVC D-ILA RS-46 w/ 128" 16:9 1.4 TREATMENT: Custom Bass Traps and Acoustic Panels (11)
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Love a good ol' EBS build. Noice!

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post #13 of 403 Unread 03-09-2017, 04:31 PM - Thread Starter
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post #14 of 403 Unread 03-09-2017, 04:36 PM
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Quote:
Originally Posted by eng-399 View Post
Sorry guys I'll respond back to everyone once I get back from the ER... my daughter might of broke her ankle during gym class today at school I'm in the ER right now getting X-rays...never a dull moment
Damn, hope a fast healing! Just remember that nothing happen when you do nothing.
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Sorry to hear... Hope she's ok

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Well dang! This will be epic.

I hope your daughter is OK. I have 3 boys under 6 and all they want to do is test every physical outcome. Lol
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post #17 of 403 Unread 03-09-2017, 05:17 PM
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Quote:
Originally Posted by joebuddyguy View Post
Also, tell us more about that port flare at the beginning of the port... Inquiring minds want to know 😁

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its just a flare lol, helps prevent noise
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post #19 of 403 Unread 03-09-2017, 06:33 PM
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its just a flare lol, helps prevent noise
Haha, from looking at it from my phone it looked like some kind of longer tapering flare akin to a design Danley was using to cheat port velocity. Never mind me if it is just a simple port flare

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post #20 of 403 Unread 03-09-2017, 07:08 PM - Thread Starter
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Hey guys just back back home and it's a fractured ankle... we go see the orthopedic doctor in the morning. She was a trooper at 8 years old my son being 6 ran out of patience after a few hours but pulled through it.


Now back to this build
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post #21 of 403 Unread 03-09-2017, 07:15 PM - Thread Starter
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Just curious, what would these do in large sealed boxes... 6-10cu ft?
here's some charts for 6 cubic ft and 10 cubic ft.
1 graph os 6 cub and 10 cub with only one driver the next chart is with 4 drivers
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Last edited by eng-399; 03-09-2017 at 07:21 PM.
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post #22 of 403 Unread 03-09-2017, 07:26 PM - Thread Starter
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post #24 of 403 Unread 03-09-2017, 07:44 PM
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Quote:
Originally Posted by eng-399 View Post
It should be like having 2 JTR 4,000's in the room but with more bass than just those two cabinets if my measurements are right.

........Nice!
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You work quick, and do good work, it's crazy. Looks like that router table is being put to good use. Can't wait to see how these turn out.
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man, that is some good looking bacon!
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post #27 of 403 Unread 03-09-2017, 07:57 PM - Thread Starter
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post #28 of 403 Unread 03-09-2017, 08:01 PM - Thread Starter
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Nice progress!

You're moving so fast you should finish my ported boxes for me
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post #30 of 403 Unread 03-09-2017, 08:20 PM - Thread Starter
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Nice progress!



You're moving so fast you should finish my ported boxes for me


lol I started last week. I didn't want this build to go on for ever. Plus I was waiting on the drivers to come. Seeing the size of these drivers in person I can imagine your drivers with the added weight. There big!
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