30 replies to this topic

[ProClass]

I have made mention that I am planning on building a comp vehicle in the CAASQ SQ thread but thought I should post my planned enclosure design here as well. {Hope Marc doesn't mind me doubleing up on posts}

Anyway, I welcome comments and suggestions on the sub enclosure design presented here.
I have decided on Orion H2 12"
They are not yet available in Australia but after speaking with some mates in Canada I think I have made the right choice. I have not decided volumes as yet or tuning freq. The only thing I have decided on is construction and offer the drawing below for everyone to offer up opinions.
You can review the driver specs here.



Thoughts?

Cheers

[Luke352]

EEEK!!! looks like some serious work.

[HBD]

Yeah but if anyone can pull it off it's proclass

[~thematt~]

What do you mean the H2 isnt available in Oz?? I have seen one myself, unless they made another that looks identical...??

And do we really need to give you the 'one is better' speech ??

Good luck, hope it turns out as well as you/we hope!!

[ultim8DTM5]

I've got a better idea - PM incoming...

[~Spyne~]

very interesting design there, but i guess if u want to play in spl as well as make a showing in sq, then you have thought through the design and are happy with the potential (software predicted) results.

a lot of work there to get it right, and i would tend to think that the DOUBLE 32mm hdf, PLUS sand fill, PLUS damping material would be a little overkill. i dont really believe there is much to be gained from hdf over mdf, especially at those thicknesses, but its obviously what u want.
all i can say is, i hope ur car doesnt mind the extra (read: extreme) weight, and i cant wait to hear how u go next year. will also be my return to caasq after a season and a half off

[Pulse-R]

Liquidity, on Jul 18 2006, 08:47 PM, said:

I thought cone faces had to face each other be very close, in "push-pull", if you were playing music. From myunderstanding, putting a gap between them would cause all sorts of resonance problems at various freqs if you were playing full-range music.

for the low frequencies of a sub, that's fine - if anything, the front magnet sits partly inside the rear cone.

[ProClass]

matt
Spoke with the distributor today and no, the H series in the link I offered are not here yet.
As with the "speech", you can give it to me as I look down on you from the podium. LOL
PM coming?
Liquidity
Push/Pull arrangements come in all forms. Face to face, back to back, in line. The one I found works best is the in-line version. Manufacture tolerances being the biggest factor. Drivers, like it or not have different positive and negative characteristics.
Granted, the added "coupled” volume between the drivers with an in-line design are a concern I am hoping the added damping material in the couple area of the enclosure will reduce the effect of the added volume of an in-line design. The mount depth of these drivers {8"} rang a bell with me too! I expect this will help impedance rise issues with respect to VC temperature over time.
~Spyne~
SQ first! Foremost and above all NUMBER ONE GOAL, SPL second, .... very second and only second because a third is un-defined! {I could give a rats ass if the system sets SPL records. To me SPL is nothing more than how much money you spent. What I like is the idea of is winning SPL with a system that is SQ based. I’d love nothing more than beating a SPL guy with a system playing REAL MUSIC. Anyone with money can own a world record in SPL. EG Norma Gates/PPI.}

The level of work here isn’t that complex guys. One box wrapped around another box that’s 12mm smaller can’t be that hard! Can it?
Are the advantages of the design as presented worth the effort or not?

[Captn_Awesome]

possibly however sand filled boxes have always presented a problem due to settling issues.

There was a manufacturer (a specialist manufacturer) in the 70's i believe who had this type of set up but used a cement "mud" to fill between the boxes to add the weight and reduce resonance and flex.

I'd be interested to see (well hear) the difference that a inner and outter skin type box like this compared to a simarly designed box with just the inner skin...

[Michae1]

spl head comin in to make smart a.ss comment note: its just poking fun, no harm is meant

Quote

Anyone with money can own a world record in SPL. EG Norma Gates/PPI.

Its Alma Gates and currently JBL



as u were gentlemen

[~thematt~]

Isnt Norma Gates that dude from American Psycho?

[The Don]

so - whats the advantage of going for an encolsure like this? Looks expensive and complicated!

[Juls]

Looks Good Mate,
can't wait to see the progress assembly images.. your going to let us have some right??

Man I'm putting off making new Sealed boxes for my 11" subs..

let alone attempting something like that !!! your nuts!

Awesome but..
Good luck with it.

Is there alot of advantage in making the box So stiff like that ?? in terms of SQ.

my current boxes are 18mm, without bracing (only 24 litres but) Under full load I can just feel the box slightly flexing.
so i'm considering using 25mm MDF and bracing the boxes in the new ones I build shortly.

is it going to be that much better sounding in terms of SQ?
or do I gotta start sticking dirt in my box? LOL

thanks
Juls

[SCorpion]

why isn't fibreglass considered? why are u using wood and sand instead of fibreglass?

if we can build boats that can withstand more 1.5 tons of pressure on an area the size of ur monitor screen and have a hull that weighs in @ less than 20kg's, then surely u could make a sub box out of it.

i mean, dont get me wrong, i prefer wooden boats over fibreglass ones but surely u would be taking weight as a desgin criteria.

unless of course there is a secret advantage of usin wood over fibreglass that i dont know of.

i would make the box out of a carbon fibre foam sandwhich, since money isn't an issue here obviously.