The design is free and anyone can build it.
They have a dedicated forum for this subwoofer,
Plans, drawings,prediction charts, response charts are here:
Its a dual 12" driver horn loaded subwoofer, 22.5" wide x 45" deep x 45" tall.
I am looking for a very high output subwoofer to be used for mostly demos and partys, I want my living room to have
the same sort of hard hitting bass that is usually only
heard in cars with massive stereo systems or some really nice clubs.
Here Mark Seaton talks about how this sub could work well for HT use...
|If you want car level output in lew of huge, sub 20Hz output, I would certainly build the LAB basshorns. Tom Danley and I have been talking recently about possibilities in a confined space. The ideal solution is to stack a pair against a wall and fire them into the corner where the corner effectively becomes a flare extension. In this case, Tom expects an F3 of about 29Hz before room gain. With the size room you have James, I would expect a good deal of gain to come into play. You would probably only need a shelf filter and some EQ in the mid 20Hz range. The drivers will barely be moving above 30Hz, so you would still have the 13+mm of Xmax available to electronically assist the bottom end. Of course below ~25Hz, it operates as a sealed system, so you would likely be able to reach the Xmax limits of 4 drivers, but I'm unsure how much the room gain would help and exactly how loud you could get down low. I would expect you to really like the dynamics of a true bass horn like this. The driver cost wouldn't be all that much. The box will require some work, but others have already built some. The efficiency off of the horn will be scarry with the power you have available IIRC. 2 boxes stacked should be around 35% efficient (= >107dB @ 1W/1M) from what Tom figured|
I am considering building one or two of these for my room for an extremely high output music only subwoofer(s).
I do not want to give it any assistance so I would just cut it off at 30Hz.
I though I would start a thread about this subwoofer in case any of you guys are looking for extremely high output.
I am not sure what one or two of these subwoofers would put out from 30Hz on up but I have read each sub would take about 2000watts and with the efficiency around 107dbs we are talking major output.
I am guessing a pair in my room would put out ~21 more dbs than my dual Tempests from 30Hz on up..thats about 133dbs in my room...this should give me the chest thumping bass I am looking for.
The main negative to this project is that the boxes seem fairly complicated.
Positives are that a pair of these stacked and firing into a corner would take up very little space and this is a fairly inexpensive subwoofer.
I think this is the project I have been waiting for but I am still not quite ready to commit because the boxes look like a pain, I would appreciate a more detailed 'how to' on building these enclosures.