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post #1 of 14 Old 12-16-2018, 06:20 AM - Thread Starter
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Sub box build? Thoughts? THanks :)

Hi,


Been a long time since I was here, but i figured i would come ask for some advice.
I have 2 subs I put into a sealed box , 2 RE XXX 18's.Older Gen. Yes they are car subs but have them working in home with a PODS balanced to unbalanced converter and Behringer EP 4000.
Wired into 4 ohms bridged.


They hit pretty hard and low but i know in a ported box they can show their potential.



I was thinking on making a dual ported box each with their own chamber, OR, single ported boxes that I can move them around individually. I can also keep them wired as 4 ohm to take full advantage of the amplifier.


I have mixed box designs before when i was going to build one but i'd love to have them hit the really low low's for HT use.



I do know that currently sealed they do send a few scares in scary movies on quiet scenes then a bass hit


Another thing is i'm having a hard time with placement. It feels at times that i'm just not getting the sound i should out of them. But i'm 100% sure it's placement. I tried the subwoofer crawl and found a few spots but where it is, i just cant put them eg middle of living room.


Any thought on a box build?


Thanks
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post #2 of 14 Old 12-16-2018, 06:24 AM
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Large ported.
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post #3 of 14 Old 12-16-2018, 06:51 AM
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I don't know how much space to work with you have. I think this may be the same woofer that @MKtheater has set up as a ported IB set up with fantastic results.
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post #4 of 14 Old 12-16-2018, 07:36 AM
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I would do individual ported boxes for flexibility of placement and to save your back when moving them!
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post #5 of 14 Old 12-16-2018, 07:56 AM
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Thanks to jpmst3, this link to a calculator:
https://www.diyaudioandvideo.com/Cal...rBoxEnclosure/
Or just buy this:
https://www.diysoundgroup.com/bundle...t-cabinet.html

Michael

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post #6 of 14 Old 12-16-2018, 08:00 AM
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Quote:
Originally Posted by Duncan Tronrud View Post
They hit pretty hard and low but i know in a ported box they can show their potential.
Or keep the sealed boxes and add a miniDSP to boost the low end.
Michael

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post #7 of 14 Old 12-16-2018, 11:57 AM - Thread Starter
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Quote:
Originally Posted by Randy_J View Post
I don't know how much space to work with you have. I think this may be the same woofer that @MKtheater has set up as a ported IB set up with fantastic results.
I have i'd say alot of space to work with.


Max box size could be roughly 8 feet wide, by 6 feet tall by 3 feet deep. Would be behind the couch, but if i do large ported single boxes i could go 4x4x4 at max each.
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post #8 of 14 Old 12-16-2018, 12:02 PM
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Those subs could probably use a beefier amp too, such as an fp20k. Which then allows for another 2 RE's...

You should buy a CSL UMIK-1 so that you can measure to 5hz precisely.
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post #9 of 14 Old 12-16-2018, 12:04 PM
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Quote:
Originally Posted by Duncan Tronrud View Post
I have i'd say alot of space to work with.


Max box size could be roughly 8 feet wide, by 6 feet tall by 3 feet deep. Would be behind the couch, but if i do large ported single boxes i could go 4x4x4 at max each.

https://data-bass.com/data?page=system&id=8

Ask your doctor if DIY is right for you. Side effects of DIY may include anxiety, elevated blood pressure, lightheadedness, rapid heartbeat, skeletal muscle flaccidity, euphoria, psychological dependence, insomnia, confusion, blurred vision, implusivity, uncontrolled or repeated movements.
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post #10 of 14 Old 12-17-2018, 07:11 AM
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I would build ported tuned to 10-11 hz like posted above. These really shine in enormous boxes. I actually get the same bass from them in an IB with a LT as the ported design. The small boxes severely handicaps them. Ricci had once said they were the ultimate IB drivers. I bought his. They perform better than expected and I was coming from 12 Si 18ht.

Audio Design Associates/Outlaw
Speakerpower SP1-4000
subs-Re audio XXX 18 IB(LT).
DIY speakers-mktheater-S10/S12s
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post #11 of 14 Old 12-18-2018, 06:02 PM
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Quote:
Originally Posted by scottvalentin View Post
I would do individual ported boxes for flexibility of placement and to save your back when moving them!
Like for doing the sub crawl.

If bad sound were Faital, good sound would be almost impossible
Killed two Mach5 21s and three UM-18s (and counting?)
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post #12 of 14 Old 12-21-2018, 03:59 AM - Thread Starter
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Quote:
Originally Posted by michael hurd View Post
Thanks,


Ya i seen that sub box before but that is well out of my league for supplies and building area lol.

I dont quite have the garage space to build that big of a project.



But i did see that earlier this year and looks amazing.
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post #13 of 14 Old 12-21-2018, 04:03 AM - Thread Starter
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Quote:
Originally Posted by MKtheater View Post
I would build ported tuned to 10-11 hz like posted above. These really shine in enormous boxes. I actually get the same bass from them in an IB with a LT as the ported design. The small boxes severely handicaps them. Ricci had once said they were the ultimate IB drivers. I bought his. They perform better than expected and I was coming from 12 Si 18ht.
Agree'd. I'm not quite proficient yet with the box building specs.


Sorry to ask but what do you mean by IB , LT?



I'm hoping to find a program that works good or someone who know's more of what they are designing. I"m looking for a simple design possibly? I do not mind buying large ports as i think i looked on a program once and it asked for 8" Flared port.


I like the look of the large sub box's that have the 3 Flared ports on the bottom below the sub.

Last edited by Duncan Tronrud; 12-21-2018 at 04:10 AM.
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post #14 of 14 Old 12-21-2018, 04:29 AM
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Quote:
Originally Posted by Duncan Tronrud View Post
Agree'd. I'm not quite proficient yet with the box building specs.


Sorry to ask but what do you mean by IB , LT?



I'm hoping to find a program that works good or someone who know's more of what they are designing. I"m looking for a simple design possibly? I do not mind buying large ports as i think i looked on a program once and it asked for 8" Flared port.


I like the look of the large sub box's that have the 3 Flared ports on the bottom below the sub.

IB - Infinite baffle LT - Linkwitz Transform


Regarding multiple ports, they will have more friction than a single, large port by virtue of more surface area, keeping the Reynolds number constant. A round port has the lowest friction than any other shape, less surface area.



Keep in mind that the slug of air mass in the port has to move in both directions at a high rate of speed, and high velocities will produce audible chuffing noises and losses. I'd target 10 meters per second as a great port, 20 meters per second velocity would be on the upper end of what I would like to see.



With a large displacement driver like the RE XXX 18, you need a large port.



Some driver / ported box requirements are literally a no-go, requiring impossibly long vents in tiny enclosures due to the parameters of the driver. In these use cases, passive radiators are the only way to obtain more output than a sealed enclosure.

Ask your doctor if DIY is right for you. Side effects of DIY may include anxiety, elevated blood pressure, lightheadedness, rapid heartbeat, skeletal muscle flaccidity, euphoria, psychological dependence, insomnia, confusion, blurred vision, implusivity, uncontrolled or repeated movements.
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