Collab Subharmonic PA Sub...

[FlipC]

So we have numerous plans for superb bass cabinets.
Was just thinking it would be a good idea to collaborate on a true sub. Upper cut off being 50 Hz. Low cutoff 15-18 Hz. Max SPL level 125 DB MIN.
Achieve this within a cabinet able to be moved by a single individual and also costing on the lower end of the spectrum. Doesnt have to be as cheap to build as the SS15 but wouldn't want it to cost more the the Mini Clone.

Everything I come up with is $ and BIG.

[weltersys]

Originally Posted by FlipC

So we have numerous plans for superb bass cabinets.
Was just thinking it would be a good idea to collaborate on a true sub. Upper cut off being 50 Hz. Low cutoff 15-18 Hz. Max SPL level 125 DB MIN.
Achieve this within a cabinet able to be moved by a single individual and also costing on the lower end of the spectrum. Doesnt have to be as cheap to build as the SS15 but wouldn't want it to cost more the the Mini Clone.

Everything I come up with is $ and BIG.

125 dB in half space, quarter space or 1/8 space?
Big difference in $.

What do you mean by "low cutoff", -3 dB, -10 dB?
Again, big difference in size and $.

A single individual can move anything with the right machinery, what size and weight are you looking for?

Is the DTS 10 too big, heavy, expensive and not enough output for your taste ?

[pinkmouse]

Originally Posted by FlipC

...Achieve this within a cabinet able to be moved by a single individual...

What about the amp racks to power it?

[seanny]

Originally Posted by pinkmouse

What about the amp racks to power it?

PA and grandma amp...who?

[wg_ski]

Originally Posted by FlipC

Everything I come up with is $ and BIG.

And it will be. This is beyond the capability of any one box, period. To put it in perspective, getting 26 Hz at 135 dB without any help from a corner requires six $600 labhorns at 30 cubic feet each. A single 18 Hz box will be bigger, and you'd need a stack of them. It might even be to the point where each box may require field assembly. We're talking 20 foot path length, and mouth about 4x4 feet (for 1/8-space equivalent). The driver(s) would need to be able to push a 25-pound weight directly on the cone without failure. It will burn out the main deflector dish, but it will be one he!! of a bang.

When do we start?

[chris661]

I don't understand why.

125dB would imply PA use, and there's nothing out there music wise that would require such an extreme specification - organ music with 16Hz content is rare. When such acoustic power has the capability to structurally upset the building around the organ, I can't see why 125dB @18Hz would be useful in any way, unless you just wanted to be able to re-arrange your home.

Chris

[jbell]

D&B has notes strong to 28hz, no lower than that have I actually seen rta for....

Is flat to 28 what you are after? That's a whole other animal vs 15-18.

I think a dual titanic 10 would fit the 28hz goal. (attached is a hornresp of a single.... just double it up)
As a double it'd be close in size to a ss15.

[wg_ski]

Originally Posted by chris661

I don't understand why.

This is not intended as a flame or any sort of attack, but someone whose avatar is a copper phase plugged (is it Seas or Fostex or??) driver will probably never understand a DJ's obsession with BASS.

If you build an 18 Hz capable system, you'll find 18 hz to put through it. AC/DC played through a stack of Basstech 7's (and a dBx 120A) was the single event that started me on the path to the dark side. And if you can do 18 Hz even semi-cleanly, you put 25 or 40 into it at insane levels and there's not even one hint of stress.

[chris661]

Originally Posted by wg_ski

This is not intended as a flame or any sort of attack, but someone whose avatar is a copper phase plugged (is it Seas or Fostex or??) driver will probably never understand a DJ's obsession with BASS.

If you build an 18 Hz capable system, you'll find 18 hz to put through it. AC/DC played through a stack of Basstech 7's (and a dBx 120A) was the single event that started me on the path to the dark side. And if you can do 18 Hz even semi-cleanly, you put 25 or 40 into it at insane levels and there's not even one hint of stress.

Wooden phase plugs, Fostex FE126E

I'm running a couple of tapped horns in my room (17 year old's bedroom system), which go down to ~25Hz. I can see the need for bass: there's a certain satisfaction of hearing stuff rattle, and feeling the floor beneath you move as you turn it up. I play bass guitar and enjoy rattling stuff in my room, so I do get it.

Chris

[FlipC]

Apologies for not stating this will be for PA work
So 2 Pi.
So far the only thing to come close is 2 21" TH's.
Either the dual TH221 or 2 600 Lt RCF 21" TH's. Both going to cost some $1K.
I assumed a BP would be the ideal enclosure type due to such a narrow band width wanted. And to keep the physical size down (40-50 Hz and below)

chris661 - hard to believe you said that and your British...
You obviously don't go out much or listen to modern music. Even pop music now goes sub sonic.
Here is a pic from your side of the pond:

Those are Psycho's on the bottom.
||| Void Acoustics ||| Changing the way you look at music ||||||||||||||||||||||||||

Bass is an addiction.
Once you become experienced you want it.

JBell - nice but not what I was thinking about.

Amps - well not to concerned with that. becoming cheaper and cheaper.
Size... Well a single person cant really move a Lab Sub. Plus you really need 6 of them.
Might as well build the 21" TH's. So if you cant move it by yourself without mechanical assistance then no.