terminator horn

  However, bear in mind it has four 1Kw drivers in it.  The ammount of effort to build four 1 driver cabs of the same power handling would be considerably more (4 punishers is an obvious comparison) and the wood & weight savings are huge.  The final speaker built from void free Russian birch plywood with ceramic magnet drivers weighs less than 100Kg.  With the big handles at either corner it's quite easy for two people to carry up stairs, with four it's easy (its the same size but lighter than a lab-horn.)  The box is held at each corner with the four drivers at the bottom, so the people carrying it all stand upright, so there's less risk of back-injuries when the boxes do have to be moved by hand.

  If 4 neodymium drivers are used the total weight would drop to about 75-80Kg, which for the power handling & size is excellent.

  Also i must say that despite being built out of 12mm plywood, it is totally robust.  There is no panel vibration when it is being driven (not usually the case for 12mm builds)  This is due to every panel having alot of internal bracing, this is something that worked really well with the design.

  The mouth and handle supports are all doubled up 12mm ply too, so they are 1" thick where the cab needs strength.

  The access panels are made of 4mm aluminum alloy & have been crudely bolted on in this design, i'd recommend recessing them (i'm lazy) They are also heatsinks for the drivers, which i think is essential.

  I'll sell the design more & say that at the same output levels, distortion levels will be close to a lab-horn, this is because even though the drivers in this, ciare12.00sw's have a much stiffer suspention, they will be excursing roughly 1/2 as far as the lab-12 in the labhorn.  However, this has five times the power handling of 1 lab-horn + heatsinking, so possibly up to 10x the long term power handling.  This is also a very responsive/fast horn, mainly due to the air-load on each driver being much smaller than in most bass-horns.  In real use there is little benefit to using a kick horn before an MT122(dual 12") style mid range horn (except for higher power handling & lower intermodulation distortion).  I typically cross out of this box at about 120hz.

  Finally, i designed them to be used in pairs, as in the video, in this configuration they look good to go to 30hz half space.

 

cheers,

  Rob.

  The main difference being that my design has 4 drivers rather than 2.  I wanted to get as much power as possible into a manageably sized speaker cabinet.  It's possible to get four of these+2midtops+racks,cabling,decks etc.. into a typical long wheel base van & the whole system (with lightweight amps) could weigh less than 700Kg for 20Kw's worth of speakers!

edit: its soundphysics not servodrive, i think they were the same thing at some point check out http://www.soundphysics.com/SPL-BDEAP32.html

  Some mobile pix show them here:

 

 

I used two stacked correctly at this party, but never got to turn it up (too loud for the croud , for me it was just getting there )