Subcabs loaded with dual Dayton 460s - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 18 Old 05-16-2019, 03:11 AM - Thread Starter
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Subcabs loaded with dual Dayton 460s

Last week I built a cab loaded with dual Dayton 460s and I was wondering if anybody else did something similar.


Every driver is in a 5,3 cu ft part of the cab, port length is 46 in, port is 106 sq in. Drivers are new, and not broken in.


This one is a test version built in 18 mm MDF with minimum bracing, the final ones are to be built in 21 mm Birch with more bracing as this cab was vibrating a lot when pushed a bit. I plan to build two of these cabs.

Hope anyone is willing to take a look at these and comment, especially the way the ports are put in.
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post #2 of 18 Old 05-16-2019, 08:10 AM
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post #3 of 18 Old 05-16-2019, 01:21 PM
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Welcome to the Club .. .

This, int. 9.5-ish , 4 triangular ports in corners,(better cabinet bracing)
tuned more for MBM, about 1K, 1 channel Inuke6K with DSP thru a minidsp2x4HD

ext 40 x 28 x 18

pics are from 3 years ago, but it took another year to finish the veneer on the front baffle

Moral: don't bring an unfinished speaker into the arena "just to try it out"

a @LTD02 design -TY

AWESOME
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post #4 of 18 Old 05-16-2019, 01:26 PM
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p.s.

FR is looking good for that testing set-up

but those who KNOW may want to suggest other conditions for "open field testing" i.e. no walls, mike closer to the drivers, etc.

How does the in-room response look?

DIY FAN Denon X4400 , ATI A 2000 for 7.4.6 SCATMOS Sammy 82" 4K/HDR
L/R: Fusion 15 V2 , C: 88 Special , SL/SR: 88 Special(V2) , RL/RR: F-3, TF/TR: Volt 6's TM: SLX, FH: F4Q4
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post #5 of 18 Old 05-16-2019, 08:41 PM
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Subcabs loaded with dual Dayton 460s

Quote:
Originally Posted by Wim M View Post
Last week I built a cab loaded with dual Dayton 460s and I was wondering if anybody else did something similar.


Interesting build, very cool!

Sweet enclosure, looks like a stacked Marty cube, which I’m a fan of driving a 460, but with a lower tune. Was that your design goal here? Other than the vibrations in the temporary cab, how does it perform? That’s a lot of work for a test run. When does the real build begin?

Speakers: PSA MTM-210T x2, MTM-210C, MT-110SR x2; Atmos-SVS Satellite x2, DIY Volt-10 x2
Subs: PSA V1801 x2, DIY: 18" RSS460HO, 15" RSS390HO x2, BOSS w/JBL CX1200 x6
MA’s: Crowson Tech x2
Processing: Denon X4200, NU6KDSP, 3KDSP
Video: Epson 3700; Screen: Silver Ticket 106" High Contrast
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post #6 of 18 Old 05-17-2019, 06:29 AM - Thread Starter
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Quote:
Originally Posted by asarose247 View Post
p.s.

How does the in-room response look?
Yes I did a measurement when the cab was placed in a corner in my listening room, after I removed it I found out that REW had crashed before I could save my results. So I cannot post a FR graph of it, but the -3dB was in the 9Hz region, which I was fairly impressed with. ...and a big null at 45.

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Originally Posted by Sekosche View Post
Interesting build, very cool!

Sweet enclosure, looks like a stacked Marty cube, which I’m a fan of driving a 460, but with a lower tune. Was that your design goal here? Other than the vibrations in the temporary cab, how does it perform? That’s a lot of work for a test run. When does the real build begin?
The cab is actually two Marty's combined into one cab. So what I've been thinking about is this: If I moved the port to the bottom of the cab, I will basically get one big cab, instead of the 2 combined I have now. If I use the same port and keep the length the same, it will lower tuning freq since the volume of the box has increased. How will this affect sound, I will use it for music mostly and an occasional movie, SQ is most important.
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post #7 of 18 Old 05-18-2019, 05:29 AM
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The center port looks cool but you might get slightly lower tune if you put it on the end that sits on the floor, slot ports have a coupling effect. Probably about like adding a couple inches to the length give or take.

If Baltic birch is available consider that, it’s a great material. The 5x5 sheets sometimes help material efficiency and sometimes hurt it depending on the cab size.
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post #8 of 18 Old 05-18-2019, 11:36 AM - Thread Starter
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[QUOTE=Vince_B;58064164]The center port looks cool but you might get slightly lower tune if you put it on the end that sits on the floor, slot ports have a coupling effect. Probably about like adding a couple inches to the length give or take.

Thanks for your answer, that was basically my question. As the port is now mounted in the cab, it divides the cab in two. If I move the port to the bottom I will get one big box. If I keep the port surface the same, in that big box, I will end up with a port length that probably can't be fit in. Assuming that tuning is kept at 15.

If I want to keep port length under 50 in, I will have to reduce port surface to half of what it is now. Something like 19.3 in x 3.1 in. Is this not too small with dual 18s firing through it?
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post #9 of 18 Old 05-19-2019, 01:26 PM
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[quote=Wim M;58065614]
Quote:
Originally Posted by Vince_B View Post
The center port looks cool but you might get slightly lower tune if you put it on the end that sits on the floor, slot ports have a coupling effect. Probably about like adding a couple inches to the length give or take.



Thanks for your answer, that was basically my question. As the port is now mounted in the cab, it divides the cab in two. If I move the port to the bottom I will get one big box. If I keep the port surface the same, in that big box, I will end up with a port length that probably can't be fit in. Assuming that tuning is kept at 15.



If I want to keep port length under 50 in, I will have to reduce port surface to half of what it is now. Something like 19.3 in x 3.1 in. Is this not too small with dual 18s firing through it?

If you click quote on a post it will notify the person that you replied

You might be trying to tune those drivers too low. Try tunings in the low 20s. Or put one driver per box. Or get ultimax. I haven’t modeled the 460 but I think most cabs for it are tuned a little higher.
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post #10 of 18 Old 05-21-2019, 10:28 AM - Thread Starter
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[quote=Vince_B;58070042]
Quote:
Originally Posted by Wim M View Post



You might be trying to tune those drivers too low. Try tunings in the low 20s. Or put one driver per box. Or get ultimax. I haven’t modeled the 460 but I think most cabs for it are tuned a little higher.

Thanks for the advice. Basically you're saying to keep the cab as it as now, two smaller boxes combined into one big cabinet.
Ultimax is not really an option, I just bought these 460s brand new so I guess I'll have to go with these ones. Plan is to build two of these cabs (quad 18s) A pair of 460s and a pair of UMs is probably not a good option.
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post #11 of 18 Old 05-21-2019, 10:32 AM - Thread Starter
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Maybe @LTD02 already built one of these cabs? Sure would love to hear his opinion about it.
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post #12 of 18 Old 06-06-2019, 11:35 PM - Thread Starter
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Did a rebuild. The first version had the port in the middle and divided the cab into two smaller cabinets. Now the port is at the bottom of the cab and thus making it into one big box. Extension has increased, but efficiency has dropped 2,5 dB.
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post #13 of 18 Old 06-07-2019, 01:22 AM
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Quote:
Originally Posted by Wim M View Post
Did a rebuild. The first version had the port in the middle and divided the cab into two smaller cabinets. Now the port is at the bottom of the cab and thus making it into one big box. Extension has increased, but efficiency has dropped 2,5 dB.

Nice! That’s some impressive extension for a pair of 460’s! I wonder how close to their excursion limits they are tuned that deep.

Speakers: PSA MTM-210T x2, MTM-210C, MT-110SR x2; Atmos-SVS Satellite x2, DIY Volt-10 x2
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post #14 of 18 Old 06-07-2019, 10:40 AM - Thread Starter
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Quote:
Originally Posted by Sekosche View Post
Nice! That’s some impressive extension for a pair of 460’s! I wonder how close to their excursion limits they are tuned that deep.
Yes, I think it sure looks impressive. I heard the MDF panels cracking

I don't have anything to actually measure or model cone excursion but I had the impression that they were not maxed out. Today I hooked the sub up to my setup. I thought bass sounded -how can I say this- slow. It sure took a whole lot more power to let them keep up with my mains, compared to the previous version. I guess I tuned those 460s too deep, so I 'll try a shorter port and hear what happens...
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post #15 of 18 Old 06-10-2019, 10:43 AM - Thread Starter
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Here is version 3 of my sub, which is basically similar to version 2. Only thing I changed was the tuning. Version 2 was tuned to 15 Hz, this one to 20 Hz.

-3dB went a bit up, but it sounded less boomy and faster, I am starting to like what I hear.
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post #16 of 18 Old 06-10-2019, 01:44 PM
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Looks great!
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post #17 of 18 Old 06-14-2019, 05:53 AM - Thread Starter
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So here is version 4 of my testcab. The cab is looking pretty beat up in the meantime. That's what a testcab is for

So as efficiency was a bit of a concern, I decided to double the port area (compared to ver 3) Which meant that I had to make the port considerably longer to keep the 20 Hz tuning. Again some testing outside, where I found that the baffle of the upper driver had come loose from the rest of the cab. Using thicker screws solved the problem.

Efficiency has improved, but I didn't like how it sounded. Again that slow boombox sound.

So far I think using large port areas and keeping port length as short as possible is key. Up to version 5!
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post #18 of 18 Old 06-16-2019, 11:28 PM - Thread Starter
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So here is version 5 of my testcab. It looks very similar to the first version, but I removed the second part of the port. This should tune the cab somewhere in the mid 20s. It sounded as if that was a bit too high.

Now going through all the measurements I've made of all the different configurations and trying to decide which one I should build in a final version and actually use in my setup.

All recommendations welcome!
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