Far Beyond Driven build LaVoce 21's slot ported - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 32 Old 11-06-2019, 05:50 PM - Thread Starter
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Far Beyond Driven build LaVoce 21's slot ported

Hey guys back at it again this build is for Wayne out in Madison Wisc. he's using the LaVoce 21's for drivers and I'm building his boxes. What he has is a box from @Red Five already that's for nearfield and I'm building 2 slot ported boxes for the front of his room.

Box is 25w/26d/38h which is 11 cubic ft and tuned at 17hz.

Once this is done I'll be incorporating The mini dsp DDRC-88A and Mini dsp 2/4hd with Dirac live for both speakers and LFE channel in his Theater room.

Let the build begin
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post #2 of 32 Old 11-06-2019, 05:53 PM - Thread Starter
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post #3 of 32 Old 11-06-2019, 05:56 PM - Thread Starter
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post #4 of 32 Old 11-06-2019, 06:13 PM
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Looking good as usual. Any functional reason for the narrower port, or strictly aesthetic?

Chris



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post #5 of 32 Old 11-06-2019, 06:18 PM - Thread Starter
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Originally Posted by a77cj7 View Post
Looking good as usual. Any functional reason for the narrower port, or strictly aesthetic?

Chris



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Hi Chris since the box is 25” wide the first port resonance didn’t look that good being the wide even with some port rails. I needed to keep the first port resonance in check so having a port a 17” wide 3” tall and 41.5 inches long ended up looking really nice on winisd. The air port velocity was low as well. I’ll post all that stuff soon. The plan is to flush trim bit the port out of the first and second baffle. Should look real nice when I’m done.
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post #6 of 32 Old 11-06-2019, 06:25 PM
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Quote:
Originally Posted by eng-399 View Post
Hi Chris since the box is 25” wide the first port resonance didn’t look that good being the wide even with some port rails. I needed to keep the first port resonance in check so having a port a 17” wide 3” tall and 41.5 inches long ended up looking really nice on winisd. The air port velocity was low as well. I’ll post all that stuff soon. The plan is to flush trim bit the port out of the first and second baffle. Should look real nice when I’m done.


Ahh, makes sense. I always forget about the resonance issues.
I used a flush trim on baffles for a port that style on my last (and only) ported build. I would recommend jig sawing it most of the way first. Killed a flush trim bit by trying to take too much material.
I did think the look turned out really good though.



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post #7 of 32 Old 11-06-2019, 07:05 PM
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Mike..... do you wonder how much MDF dust there is in your lungs at this point lol.....


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post #8 of 32 Old 11-06-2019, 07:52 PM
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Quote:
Originally Posted by a77cj7 View Post
Ahh, makes sense. I always forget about the resonance issues.
Ditto here, resonances is one of the things a look for when dancing with the model. As you already know, it can be quite the workout!

Quote:
Originally Posted by a77cj7
I used a flush trim on baffles for a port that style on my last (and only) ported build. I would recommend jig sawing it most of the way first. Killed a flush trim bit by trying to take too much material.
I did think the look turned out really good though.
Did you go through (what looks to me in that pic) 2 layers at once? Yeah, that will tax a trim bit quickly. I usually run them separately, first on the inner baffle then again once the outer has been applied. Much easier on the router/bit (and faster for me).

I built my first 5 - 6 subwoofers with a slot port in the fashion Mike is putting these together. Always liked the look, and they tuned almost exactly as they modeled. Doesn't really add to the thread, but like seeing the same method used here!

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post #9 of 32 Old 11-06-2019, 08:02 PM
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Quote:
Originally Posted by smcmillan2 View Post


Did you go through (what looks to me in that pic) 2 layers at once?

No, cut the first then glued on the second. My routers are all 1/4, so can’t run one of the taller flush trim bits anyways.

Hope we’re not derailing your thread too much @eng-399

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post #10 of 32 Old 11-06-2019, 08:14 PM
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Quote:
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No, cut the first then glued on the second. My routers are all 1/4, so can’t run one of the taller flush trim bits anyways.
Ahh, yeah, that certainly limits how much you can run through at once. I use one of my 1/2" collet routers to hog out those openings, and that still puts a burden on the bit.

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Hope we’re not derailing your thread too much @eng-399
Agreed. Although sharing is caring!

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post #11 of 32 Old 11-07-2019, 05:12 AM
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Quote:
Originally Posted by a77cj7 View Post
Ahh, makes sense. I always forget about the resonance issues.
I used a flush trim on baffles for a port that style on my last (and only) ported build. I would recommend jig sawing it most of the way first. Killed a flush trim bit by trying to take too much material.
I did think the look turned out really good though.



Chris


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What size round over did you use here?

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post #12 of 32 Old 11-07-2019, 05:33 AM
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Looking good Mike
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post #13 of 32 Old 11-07-2019, 05:40 AM
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Quote:
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What size round over did you use here?

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3/8in.

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post #14 of 32 Old 11-07-2019, 05:56 AM - Thread Starter
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Quote:
Originally Posted by smcmillan2 View Post
Ditto here, resonances is one of the things a look for when dancing with the model. As you already know, it can be quite the workout!



Did you go through (what looks to me in that pic) 2 layers at once? Yeah, that will tax a trim bit quickly. I usually run them separately, first on the inner baffle then again once the outer has been applied. Much easier on the router/bit (and faster for me).

I built my first 5 - 6 subwoofers with a slot port in the fashion Mike is putting these together. Always liked the look, and they tuned almost exactly as they modeled. Doesn't really add to the thread, but like seeing the same method used here!
I'll only go through one layer of mdf with my flush trim bit at a time. I need to get more pics posted of this build today.
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post #15 of 32 Old 11-07-2019, 06:11 AM - Thread Starter
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Dry fitting bracing and all the holes cut. As you can see on one of the braces my flush trim bit Allen screw on top of it came lose as the washer that guides the bit along the wood wore out glad I didn’t cut my finders off when hit the side of the brace

I cut strips of mdf and pin nail it to the brace then take my flush trim bit to make all my window braces...
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post #16 of 32 Old 11-07-2019, 07:58 AM
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Wayne can you post what your room looks like and your equipment.
Sorry I’m late to the party guys. I’m new to the DIY sub group and have met some really great people along the way. I want to say thanks to SOWK for starting me down this rabbit hole. He introduced me to @Red Five who I had a great time talking to and eventually met with and purchased his Storm breaker sub with the B&C 21” driver. He should have named it “Back breaker”. It’s incredibly built and a monster which will serve as a near field right behind my seating position. I was also introduced to @eng-399 . I was looking for 2 more DIY subs to replace the 2 SVS SB-16 sealed subs that I currently have, but didn’t have the tools, time, patience or technical expertise to do a DIY build so after talking to Mike (eng-399) and then driving to Illinois to meet with him I could tell that he was the one I wanted to do my build. He’s not only knowledgeable but has a genuine enthusiasm and passion. He comes highly recommended and I can see why. I didn’t want to keep upgrading so Mike convinced me to add 2 more 21” subs in front. Total overkill for a 13x18 room but there would be no need for future LFE upgrades in that room. We discussed the design goals and details and with the room being so small for such incredible low frequency firepower, I needed to have as much LFE control as possible. I also wanted to have synergy not only with 3 21” subwoofers but also with my mains as well.
Enter the Minidsp DDRC-88A with bass management plugin and Minidsp 2X4HD.

My room isn’t large like what a lot of you guys have but I’ve crammed a lot in there.
Here’s the room dimensions and equipment.

Room 13x18
3 Seaton Sounds Catalyst powered mains
M&K SS250 side surrounds ( non powered )
2 Adams A7X powered studio monitor rear surrounds
10’ Wide 2:35 screen
ISCO III Anamorphic lens
Cineslide motorized transport for ISCO lens
JVC RS500 projector
Marantz 7703 pre-pro
OPPO 203 4K universal player
Lumagen 4K video processor
2 SVS SB-16 sealed subs ( to be deinstalled just before upgrade )
1-Storm breaker 21” sub- installed behind seats.
2-21” subs with LaVoce drivers- currently being built
1- Chane 3600 sub amp in bridged mode for 21” nearfield sub.
2 NX3000 DSP sub amps for 2 21” subwoofers up front
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^Love my Chane 3600 amp! Just need to get the second one up and running so I can bridge em to my JBL CS1214's...

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First off, as per your username, thank you for serving.

Looks like Santa Mike is bringing you the gift of bass this Christmas! You cannot go wrong with Mike's builds; I cannot wait to get the setup he built me back into a proper room again. This is gonna be a fun one to follow, especially with the recent popularity of these hot Italian beauties, no doubt pushed into the spotlight by Mike himself.

Hopefully the weather will cooperate when it is time to transport those monsters home.
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post #19 of 32 Old 11-07-2019, 10:54 AM
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especially with the recent popularity of these hot Italian beauties, no doubt pushed into the spotlight by Mike himself.
Yes he did
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post #20 of 32 Old 11-07-2019, 12:11 PM
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I didn’t want to keep upgrading so Mike convinced me to add 2 more 21” subs in front. Total overkill for a 13x18 room but there would be no need for future LFE upgrades in that room.
This part is adorable. Welcome to the fold!
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post #21 of 32 Old 11-07-2019, 08:38 PM - Thread Starter
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The 21” crazzz——. For whom the bell tolls—
This was the moment for me.

Story time fellas


I remember when I first had everything going mtg90 and myself were in my room and just got the 21’s going. Integration started rew Audy ect ect...
I remember putting on the Metallica Blu-ray Disc and playing for whom the bell tolls. The volume started creeping up louder and louder the sound of the kick drum was insane. The pod lights in my just started raining drywall dust down from the ceiling we getting the chest slam right into or gut long with the rest of the kirks awesome guitar licks going and then James starts singing. Wow was that a moment I know these 21’s were the real deal! It’s something that just needs to be heard live in concert or in a theater room loaded with 21’s. I’ll always remember that moment and tell that story to anyone in person that’s been over. The John wick gun battle was another that was just fun to hear and feel. These 2-‘s are different than other drivers like the ht-18’s or hst line but man it’s been a fun ride having these drivers. I can’t wait for Wayne to hear them to.

Dan ya dude my lungs are probably filled with mdf. I now a mask sanding all the time.

Picture time
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post #22 of 32 Old 11-08-2019, 08:59 AM
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Mike, another Pantera themed sub build? I love it! Wayne, you are in very good hands here, and I'm sure that these, along with a third 21(!) will just crush your room. But in a good way. I'll be watching this one.

Oh, and Mike, I love the stories behind the motivation. My first big OMG HT moment was with my old faithful 15" Tempest when it was new, and firing up the end of Fight Club for the first time. Like you, I'll never forget it.
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post #23 of 32 Old 11-08-2019, 01:13 PM
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I might be dating myself here, but I remember getting my Eosone home theater set up at my college apartment, and my roommate firing up the original Star Wars trilogy on laserdisc. The room was tiny and that little 10" could really get things rockin.

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Mike, another Pantera themed sub build? I love it! Wayne, you are in very good hands here, and I'm sure that these, along with a third 21(!) will just crush your room. But in a good way. I'll be watching this one.

Oh, and Mike, I love the stories behind the motivation. My first big OMG HT moment was with my old faithful 15" Tempest when it was new, and firing up the end of Fight Club for the first time. Like you, I'll never forget it.
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post #24 of 32 Old 11-08-2019, 05:16 PM - Thread Starter
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@jevchance

Fight club scene and Star wars movie it's CRazY how we can all relate to this we all have movie clip or moment in our rooms that makes us smile. Who doesn't like a good story to tell your friends it's like buying a classic car with a story behind it.
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More pictures, Tomorrow the second baffle will go on.
No MDF dust there, well done!

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post #27 of 32 Old 11-08-2019, 05:48 PM
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This guy seems to be working at warp speed. Now that I have most of what I need including odds and ends I better get my tail in gear this weekend. I know I received a link from another AVS forum member about how to wire up the 4 pin Noctua fans but I can’t seem to find it. If anyone has it could you please link it to me. I hope this fan upgrade doesn’t become a big project. It’s just one of the many things on my to do list this weekend.
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post #28 of 32 Old 11-08-2019, 09:06 PM
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Mike, what grit do you like for tearing down the MDF? Does too much speed gum the paper up faster?

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You can always turn it down, but you can only turn it up so much (before you run out of power, excursion or structural integrity).
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post #29 of 32 Old 11-09-2019, 09:54 AM - Thread Starter
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Originally Posted by Red Five View Post
Mike, what grit do you like for tearing down the MDF? Does too much speed gum the paper up faster?
I use a flush trim bit first then jump on my orbital sander with 50 grit sandpaper. After that 120 and 220 to finsh
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post #30 of 32 Old 11-09-2019, 07:19 PM
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nice work mike, as always.
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