You haven`t heard lot from me lately, but i`m still now and than snooping the internet for new idea`s.
When i contacted you on the forum for a year ago, you where`nt into my quistions about manifold subs and so on.
But know your interrested in what the people on LAB-forum do, and that makes me wonder, what are you up to.

Let me tell you, in my busines with drive-in shows combined with self build speakers, whe walk into the same design-problems for years now.
Small and light subs don`t have enough output for large gigs, but do spear our backs. Use of double 15" cabinets, makes that you can't put more than 2 subs per side, combined with the top-speaker make insufficient stack hight.
Larger heavier subs have suffisient output, combined with a matching top speaker make a great stack, but ask to much effort put in transport and carrying. For smaller gigs they are far to big.

By my meanings the reason for Lab to build the lab-horn is to create a cabinet that will go as loud or louder as large 18" cabinets, with use of less space. And lighter cabinets, 2 lab12 speakers plus cabinet, must be lighter than double 18 cab.

Still i think the lab sub is to large, and more ment for use in larger venneus. stacking them above 3 per side makes them most efficient. I would be very interrested in a sub that`s smaller, that combines the benifits of using a 12" over a 18", as in weight. Put in a horn loaded application, whats designed smaller than the labsub. And by my meanings the bandpass-horn principle of a manifold-like sub will do in this case. The high output of a horn, together with low extensions of bandpas, make a good team.
Design a sub that when stacked with 2 per side on larger venneus, and has great output to be sufficient for 1000 people, but when used single on smaller events still makes a good stack, that would be great!

Sorry for my poor English,

Erik

Let me try to ask it this way:

Regular double 18" PA sub:
Much weight in speaker, much weight in wood, makes great stack, good output.

Labsub:
Reduced weight in speaker, much more wood, makes also great stack cause of the same size as double 18", much more output (if i believe the guys from LAB.

Pi-sub:
Reduced amount of speakers, troumendous amount of back-aching MDF, makes poor stack, good output; but not very common in use with drive-in shows.

Regular double 15" sub:
Reduced weight in speaker, less wood, makes poor stack, lacks in output on bigger events.

What i`m looking for:
Reduced weight in speaker (use mag12 speakers), reduced weight in wood (not horns as large as the labsub), Sizes that do make good stack (lets say something as single driver cabinets, wich you can stack 2 high and X-wide, +/- 2 meters high with the top-speakers on top), great output.

Would something like this be possible?

Kind Regards,

Erik

I have taken a look at some designs at a dutch PA-speaker online store at www.speakerstore.nl under option constructions, and figured that the ideal volume of such a kabinet must be around 200 liter. But that is based on half a double 18" kab. and i want to use a 12" so there must be enough room to mix in the semi-horn idea.
Kabinet hight of 610mm and 470mm wide and 700mm deep must be oke.

Now maybe you would be happy to help designing a horn/reflex combined kabinet for this mag12 speaker with great output? I really think reflexkabinets don`t have enough output.

Thanks,

Erik

I`m using the double 15" manifold for almost 2 year now, and the charecteristics of this sub are quite nice. It does`nt have much low-end, but it rocks! certainly it has no resonant spikes.

Know would'nt it be nice to design a sub working with this concept, driven by to mag12's, that has the output of a double 18"in only 200 liter of cabinetspace?

Then i can use 2 per side at 2 Ohms and have great power in little space.

Bill W.

The big problem for me tough is that their labsubs are so large and more build for larger scaled aplications. I`m playing at gigs from 100 to maybe 500 man.

Are there any more options, Anyone?

Thanks,

Erik

Bill W.

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