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post #31 of 76 Old 03-29-2019, 12:11 PM
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Originally Posted by Jsin_N View Post
No idea, I'll have to leave that to you professionals, but I'd gladly take 2 18s that way if you're bored
At 24" wide its pretty narrow for a 21" driver as that only gives you 1.5" on each side and the mounting piece will only have .75" from each side of the driver

a large part of the reason is the horn loading on the front of the driver. I don't think its actually a horn, just a tapered front end to a 6th order sub much like the Skhorn is. You could get it narrowed down to 21" wide in that case but you aren't really saving a ton of floor space still and you'd have to make it taller.

Did you have an 18" in mind?
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post #32 of 76 Old 03-29-2019, 03:16 PM
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post #33 of 76 Old 03-29-2019, 04:14 PM
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Quote:
Originally Posted by Trimlock View Post
At 24" wide its pretty narrow for a 21" driver as that only gives you 1.5" on each side and the mounting piece will only have .75" from each side of the driver

a large part of the reason is the horn loading on the front of the driver. I don't think its actually a horn, just a tapered front end to a 6th order sub much like the Skhorn is. You could get it narrowed down to 21" wide in that case but you aren't really saving a ton of floor space still and you'd have to make it taller.

Did you have an 18" in mind?
The Skhorns are already 24" wide, but I get it. There's other things to worry about other than just fit when it comes to design.

I have 4 LMS ultras I could use lol

I imagine they're not right for these applications?

I'll stop hijacking this thread tho
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post #34 of 76 Old 03-30-2019, 12:36 AM
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Originally Posted by Jsin_N View Post
The Skhorns are already 24" wide, but I get it. There's other things to worry about other than just fit when it comes to design.

I have 4 LMS ultras I could use lol

I imagine they're not right for these applications?

I'll stop hijacking this thread tho
Off the top of my head I don't know, but they are pretty amazing drivers. I'm not sure them being in a higher order configuration will give you much in the SPL department. At 16 cu/f (the size of this box) your LMS Ultras would have a pretty bitchin time a normal ported, really low tuned box.
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post #35 of 76 Old 03-31-2019, 06:02 PM
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Had to order some parts for the CNC, so no subs this weekend

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post #36 of 76 Old 03-31-2019, 06:20 PM
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Originally Posted by dsl1 View Post
Had to order some parts for the CNC, so no subs this weekend

What cnc are you using?
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post #37 of 76 Old 03-31-2019, 06:30 PM
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Originally Posted by Vince_B View Post
What cnc are you using?
Started off as a Kronos KRMx02. Quite a few things were added from CNCrouterparts kits. It's been quite a good machine. I'm sure there are better options now.

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post #38 of 76 Old 03-31-2019, 06:49 PM
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But no one is making a Skorn in their garage without a CNC machine. This you could.

CNC is for beginners
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post #39 of 76 Old 04-01-2019, 09:20 PM
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Originally Posted by dsl1 View Post
Started off as a Kronos KRMx02. Quite a few things were added from CNCrouterparts kits. It's been quite a good machine. I'm sure there are better options now.

I don’t know anything about cnc but that looks pretty legit. I see a lot of 80/20 parts I think.
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post #40 of 76 Old 04-02-2019, 08:34 AM
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Originally Posted by Vince_B View Post
I don’t know anything about cnc but that looks pretty legit. I see a lot of 80/20 parts I think.
Yeah, all the parts that need to be rigid are 80/20. The motors, rails, etc are all industrial level. Don't have a spindle currently and just a normal router which limits cut speed to ~120 inches per minute and end up cutting 3/4" material in two passes. Little $120 Hitachi router has been insane, has kept running for 5 years with hundreds and hundreds of hours of cutting.

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post #41 of 76 Old 04-02-2019, 12:02 PM
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Originally Posted by dsl1 View Post






I see what you did there.
I was thinking about suggesting that for the ports to make the vent blocks work better this time. You extended out the mouth braces to the edge too. I was trying to keep that a straight right angle cut on that edge for simplicity, but you just had to get fancy with it! That intersection with the port panel and the mouth braces looks a little odd with that cut back for the vent blocks.


EDIT: I forgot about the single piece horn bracing. More CNC peacockery!

Last edited by Ricci; 04-02-2019 at 12:06 PM.
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post #42 of 76 Old 04-02-2019, 12:50 PM
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Here is the response simulation with a couple of drivers. There will be a few minor differences due to the limitations of the sims but this should be close.

The 4 possible vent tunings should be about 29.5, 25.5, 21 and 15Hz. This design is optimized for the 29.5 and 25.5Hz tunings for pro style output levels with live music, DJing and sound reinforcement but with an emphasis on neutrality as per the Skhorn and Othorn. It will work in the lower tunings, with multiple cabs, EQ and some room gain, but the vent area is compromised and the overall output drops too. These should have a lot of headroom though. Vent area is greater than 4 6" pipes with all vents open. Even with only one vent open the area is about that of a 6" pipe.


21DS115-4 with all vents open and 1 vent blocked.




Lavoce SAN214.50 (These are using measured specs with complex inductance from a driver I have. It is a close match to factory.)

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post #43 of 76 Old 04-02-2019, 07:20 PM
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I'm jealous of you CNC guys, if I have one I'll probably have a Skhorn in every room. A slab of granite on top of a Skhorn will make a nice dining table. Hmmnn... great idea lol Skram half brothers will join big brother Skhorn soon...


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post #44 of 76 Old 04-02-2019, 08:28 PM
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Originally Posted by Ricci View Post
Lavoce SAN214.50 (These are using measured specs with complex inductance from a driver I have. It is a close match to factory.)

That looks slightly smoother than the B&C. Do you think max output will match the B&C? Could be a good driver choice for this group.
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post #45 of 76 Old 04-03-2019, 05:56 AM
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Forgive my ignorance as I am not familiar with Hornresp. Is that graph equivalent to a 1 watt SPL gragh in WinISD? As I stated earlier, I'm trying to compare this design vs. a standard large ported enclosure @20hz and the submaximus v3. I'm thinking about redesigning my boxes and I like the size of these since it will give me the ability to add more.

I found THIS link from the designer explaining the acoustical power graph and what it represents but I'm having difficulty fully understanding it. It sounds like its similar but I could be missing something. I am also researching excursion in horns to see what differences there are in that as well versus a standard ported box.

Any insight anyone can provide would be helpful.
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post #46 of 76 Old 04-03-2019, 07:30 AM
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I don't think this type of bandpass/horn offers any advantage over a ported box on the bottom end. The mid/top end is boosted by the horn section in front of the driver. Submaximus boosts the entire range thus reducing excursion for the same spl. V3 is a louder sub, but WAY bigger. 2.5 times the size!
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post #47 of 76 Old 04-03-2019, 09:57 AM
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What's the purpose of the chamfer on the bottom edge of the leftmost panel?


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Noah
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post #48 of 76 Old 04-03-2019, 11:53 AM
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What's the purpose of the chamfer on the bottom edge of the leftmost panel?
The chamfer on the port exit?

For blocking ports to lower tune
Vent Tuning: All vents open = 29.5Hz / 3 vents open = 25.5Hz / 2 vents open = 20.5Hz / 1 vent open = 14.5Hz
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post #49 of 76 Old 04-03-2019, 12:46 PM
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He's talking about the 45 on the bottom of the square panel. I think it's to chop fingers off anyone who tries to steal it. Or decapitate cats heads when they climb in.
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post #50 of 76 Old 04-03-2019, 01:45 PM
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Ah I see, the guillotine
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post #51 of 76 Old 04-03-2019, 01:55 PM
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Originally Posted by Samps View Post
I don't think this type of bandpass/horn offers any advantage over a ported box on the bottom end. The mid/top end is boosted by the horn section in front of the driver. Submaximus boosts the entire range thus reducing excursion for the same spl. V3 is a louder sub, but WAY bigger. 2.5 times the size!

Basically correct. Right around port tune a vented box of the same size (That's outside cab dimensions) will have a bit more output at vent tuning from more air volume and larger vent area. This is due to deleting the volume taken up by the short expanding slot. This type of cab leverages a bit more output over the middle of the bandwidth and possibly more up top but that's subject to design choices made. In this case it trades a bit at vent tune for more from about 33-75Hz. Having the driver buried also reduces operational noises vs a direct radiator.


Not too familiar with a SMv3 other than reading the name a few times. At 2.5x the size of this (2x the size of a Skhorn?) it'd better be loud!
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post #52 of 76 Old 04-03-2019, 01:58 PM
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He's talking about the 45 on the bottom of the square panel. I think it's to chop fingers off anyone who tries to steal it. Or decapitate cats heads when they climb in.
The edge is called an acoustic knife.
It's placement is carefully calculated to interrupt the waveform pulses emitted from the front radiation ducts at certain frequencies, causing a sudden dissipation of energy, resulting in the fastest, tightest, most airy bass ever achieved. It literally cuts the bass into individual packets of energy which are perfectly sized to better couple with your: Face, chest, neck, ears, spleen and liver. The only way to get tighter bass is to unplug the subs completely. I recommend a good set of cable lifters for the cables from the amps to the subs in order to further increase coherency. Our subs jump out of the dark, roundhouse kick you in the chest and melt into the shadows so fast we supply a 5 point safety harness and neck brace with each unit (after signing the liability waiver of course). A 7 week break in is done with real ninjas in a dojo. Accept no substitutions.








Or it could be to continue the expansion to the outside air and smooth airflow a minute infinitesimal amount, plus reduce weight by a few grams cause...Why not...
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post #53 of 76 Old 04-03-2019, 02:06 PM
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You're 2 days too late


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Originally Posted by Ricci View Post
The edge is called an acoustic knife.
It's placement is carefully calculated to interrupt the waveform pulses emitted from the front radiation ducts at certain frequencies, causing a sudden dissipation of energy, resulting in the fastest, tightest, most airy bass ever achieved. It literally cuts the bass into individual packets of energy which are perfectly sized to better couple with your: Face, chest, neck, ears, spleen and liver. The only way to get tighter bass is to unplug the subs completely. I recommend a good set of cable lifters for the cables from the amps to the subs in order to further increase coherency. Our subs jump out of the dark, roundhouse kick you in the chest and melt into the shadows so fast we supply a 5 point safety harness and neck brace with each unit (after signing the liability waiver of course). A 7 week break in is done with real ninjas in a dojo. Accept no substitutions.








Or it could be to continue the expansion to the outside air and smooth airflow a minute infinitesimal amount, plus reduce weight by a few grams cause...Why not...
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post #54 of 76 Old 04-04-2019, 12:59 AM
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A 7 week break in is done with real ninjas in a dojo. Accept no substitutions.


Would this sub be able to slice a ninja in half if tried anything stupid?
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post #55 of 76 Old 04-04-2019, 09:45 AM
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You're 2 days too late
I know. Missed my window.


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Would this sub be able to slice a ninja in half if tried anything stupid?
Turns out that it explodes their heads
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post #56 of 76 Old 04-04-2019, 10:45 AM
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I know. Missed my window.




Turns out that it explodes their heads
in for 4!
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post #57 of 76 Old 04-11-2019, 05:39 PM
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Look, a subwoofer! Kind of.
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Last edited by dsl1; 04-11-2019 at 05:42 PM.
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post #58 of 76 Old 04-12-2019, 11:04 AM
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Look, a subwoofer! Kind of.

Nice work as usual. What do you have going on with the back panel? No hatch?
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post #59 of 76 Old 04-12-2019, 11:34 AM
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Nice work as usual. What do you have going on with the back panel? No hatch?
Just hadn't cut it yet. Those panels are cut from the reverse side.

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post #60 of 76 Old 04-12-2019, 04:20 PM
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Look, a subwoofer! Kind of.
Looks like it will be heading to the Dojo shortly for break in. Very nice!

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