I started to wonder, which commercial or diy movable / portable subs have the biggest enclosure in volume, and by movable I don't of course mean enclosures that are a structure that is built to be a part of a building or some shipping containers outside the house lifted on trucks, I am talking about single enclosure subwoofers that you can still move around your room to different positions and even borrow to your friend.
I'll start with my sub that I built almost 15 years ago in Finland, which had a 850 liter sonotube enclosure with a Maelstrom 21" driver. It worked great for low frequencies and at the time I did not hear anyone having bigger one in that country. I do remember someone first had built a 650 liter sub with similar specs. In fact, that is why I built mine one step bigger.
For commercial subs I have no idea how big they get, but if I take a random example with two 21" drivers, this one is 1200 liters calculated from the outside dimensions, internal volume is of course different.
https://www.dasaudio.com/en/products/systems/ux-series/ux-221a/#dt
I'll start with my sub that I built almost 15 years ago in Finland, which had a 850 liter sonotube enclosure with a Maelstrom 21" driver. It worked great for low frequencies and at the time I did not hear anyone having bigger one in that country. I do remember someone first had built a 650 liter sub with similar specs. In fact, that is why I built mine one step bigger.
For commercial subs I have no idea how big they get, but if I take a random example with two 21" drivers, this one is 1200 liters calculated from the outside dimensions, internal volume is of course different.
https://www.dasaudio.com/en/products/systems/ux-series/ux-221a/#dt
Sweet! Makes my originally ~850 L dual 'subs' seem almost 'much ado about nothing'! 
For me, basically what fits moving from room to room with either a decent quality appliance hand truck or my 'el cheapo' variant of casters at bottom rear, grab bar plus rear glide plate for stairs, though long since lost the necessary strength, physical build to use either. 🙁
For me, basically what fits moving from room to room with either a decent quality appliance hand truck or my 'el cheapo' variant of casters at bottom rear, grab bar plus rear glide plate for stairs, though long since lost the necessary strength, physical build to use either. 🙁
I built this one so that I can still carry it, two lightweight 18inch drivers in minimal enclosure
https://www.diyaudio.com/community/...how-off-my-new-18in-build.365764/post-6711139
https://www.diyaudio.com/community/...how-off-my-new-18in-build.365764/post-6711139
I guess you didnt read what I wrote:
"by movable I don't of course mean enclosures that are a structure that is built to be a part of a building or some shipping containers outside the house lifted on trucks, I am talking about single enclosure subwoofers that you can still move around your room to different positions and even borrow to your friend."
https://www.facebook.com/knowaudio/...e-a-pic-of-the-danley-matt/10152959934230576/
Pretty unique looking cone and if someone accidentally splashes a beer in to that, you can always easily wipe it too, cool.
I noticed Steve Meade also has built some big subs, 33" driver in pretty compact enclosure, considering the size of the driver. He says the size is 20 cubic feet (600 liters)
Standard truck dimensions used to be 90" interior, commercial loudspeaker enclosures were built to integer multiples of that dimension, so 45" x 45" x 22.5" was a popular large size enclosure.
Fitting through 32" doors is a concern for movable / portable subs, limiting one dimension to 30".
60" x 60" is a standard size for Baltic Birch plywood, preferred as a construction material for it's even one-piece birch laminations, density, strength and durability.
Larger dimensions than 60" would require piecing sheets together.
DSL's 2x18" BC218 (Boundary Coupled) horn subs are 60" x 60" x 30", about 62.5 cubic feet or 1768.7 liters.
The BC218 horn throat design allows them to be used in various positions in a room or array or free-standing.
A single BC218 can produce over 140dB output (1 meter half space outdoors), adequate for most domestic situations 😎
Art
😊 If I had one and a friend was having a block party I'd take it there. I have a truck and forklift operators licence. Containers aren't difficult to move.
I designed and helped build these:
https://www.instagram.com/p/CMBIt86lbc5/?utm_source=ig_web_copy_link
https://www.instagram.com/p/CMGBpNsFL8U/?utm_source=ig_web_copy_link
They are actually a full range speaker, do they count? Over 2100mm square front.
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That indeed is huge. Probably one of the biggest professionally used subs out there. You had good information about the dimensions used in the industry.
I had hard time finding again a bigger one but still managed, this one calculated from outer dimensions is 2000 liters.
https://thesoundcounsel.com/ascendo-smsg50-infrasonic-subwoofer/
https://www.soundandvision.com/content/ascendo-s-seismic-subwoofer-modern-marvel
I don't know what kind of sound quality it has, but at least it seems to work normally in this video:
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Nice job! I never seen such a design that would also have the hi frequency horn on like that the side too. Sure I think it counts.
What are the dimensions?
Indeed. Do you know if there are there any surviving left? Just thinking does it anymore exist.
I found some more information:
https://audio-database.com/MITSUBISHI-DIATONE/diatonesp/d-160-e.html
7500 liters. 1500kg. Other source said 800kg. I calculated that if the price is correct, it is in today's money 250 000 dollars. Other source says it would be even more.
It had also a smaller cousin:
https://forum.speakerplans.com/36-monsters-from-the-fridge-brixton_topic19695_page2.html
900 liters, 150kg
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Hmm, FWIW, today 30,000,000 Japanese Yen = 200,462.40 United States Dollar. Still way too 'rich for my blood' though.
