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09-05-2009 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 101
Post ID: 11676
Reply to: 11675
In The Swim (and School Fees)
fiogf49gjkf0d
Romy, what you describe is broadly the sort of work most often undertaken by swimming pool contractors, although some high-end outdoor "hardscape" contractors (who might also do fake "boulders, etc.) might also do it.  You would have to supply VERY accurate, project-specific data, however, since very few swimming pool contractors have done anything with your end results in mind before.  Some sort of interior mold should probably be fabricated by someone who has some understanding of what you want in terms of profile, if not results.  Then the project would go more or less like you said, except the frame, wrapping, and layering ceremony might be different than you suppose.  Also, figure a couple of weeks, once they actually understand what you want.  Should be cheaper than a pool, but would require a permit in most jurisdictions, and good luck with explaining what you are doing to Planning/Zoning, Engineering and the Building Dept!

Best regards,
Paul S

09-05-2009 Post does not mapped to Knowledge Tree
jessie.dazzle


Paris, France
Posts 456
Joined on 04-23-2006

Post #: 102
Post ID: 11677
Reply to: 11675
13-step program
fiogf49gjkf0d
Though I have difficulties warming to the idea of the "headphone" arrangement for these horns, I do understand that we are talking about loading the room. Similar thinking lead me to consider setting large horns behind the listener in my own longish room... An arrangement that would have probably required something like the proposed Maturation Shields, if not to let the wave mature, then to mask the point of origin of the upper frequencies coming from those horns. Regarding these shields : When used in such close proximity to the horn's mouth, my intuition is that they may subject the exiting wave to a somewhat violent "birth"; I might first attempt a measure of validation by mocking up a pair of mini-maturation shields placed in front of the existing upper-bass horns (I understand that this is comparing apples to oranges, and that the output from a 115Hz horn would be A LOT more affected by such an addition, but it might still be informative if keeping to material that solicits the horn's lower octave).

For outdoor horns, here's a rough, off the top o' my head way I might aproach construction:

1) Design the horn so that it seals to the ground (uses the ground as its lower "wall" or surface)
 
2) Calculate the sections at 6-inche intervals
 
3) For each horn, pour a concrete slab large enough to accommodate the "footprint" of the horn as seen when viewing the house from a helicopter
 
4) From sheets of plywood, cut sections about 3/8 inch inside the line given by the calculation
 
5) On the concrete slab, set up sections with correct 6-inch spacing
 
6) Use a nail gun to attach thin wooden lath strips to the sections, leaving as few gaps as possible.
 
7) Optional : Using a hand-held disk sander fitted with a coarse grit pad, knock down all high spots on the outer surface of the wooden strips (the outer surface of these strips will leave their impression on the inside of your horn, so it pays to be neat)
 
8) Cover the wooden strips with Visqueen (or some such heavy plastic film), using a staple gun and tape (clear poly tape would be fine) to hold it in place
 
9) Apply a first layer of (your choice) concrete or Plasticrete. Plasticrete is the way to go if there's any chance you will at some future date want to move the horns (in this case you will need to apply a releasing agent to the plastic film) 
 
10) In the case of concrete, once the first layer has set up (should be at least 1 inch thick), cover the form with 1/4 inch rebar, arranged as a loose-fitting grid (4-6 inch squares. It can be sloppy; you won't see it)
 
11) Continue building up until desired thickness is attained, finishing off the exterior as desired

12) In the case of Plasticrete, add ribbing (see images of my own 40Hz horns) by laminating spacers between layers
 
13) Remove all materials from inside of horn

jd*


How to short-circuit evolution: Enshrine mediocrity.
09-06-2009 Post does not mapped to Knowledge Tree
Saturntube
Posts 24
Joined on 07-08-2005

Post #: 103
Post ID: 11679
Reply to: 11677
Big horn materials
fiogf49gjkf0d



There are some wire frame panels with styrofoam in the center than could be used,  this panels are cut to size to make any shape you want,
and then they are covered with cement,  they are very rigid and if you attach a strong steel rod frame with some sort of hook before covering them
with cement they could be movable.  
They might crack a little, and you would need a crane to move them,  but movable...


If they are square and made from sheet metal they need to be pretty thick,  maybe 3/16" steel and some reinforcing frames every foot or so.
and then cover with another sheet of metal in order to pour sand in....If not you are really making a big bell !


Maybe that material you used for those minime speakers could work...
MiniMe is made with ½” G10 and glued by Loctite 454.

Expensive but pretty movable,  and from what I hear you could go inside for shelter in case of a bombing raid!!!

PS  I just love that sand floor Idea,  there is a bar in Playa del Carmen with a sand floor...and a huge Palapa Ceiling!
09-14-2009 Post does not mapped to Knowledge Tree
Paragon
Posts 6
Joined on 09-13-2009

Post #: 104
Post ID: 11733
Reply to: 11580
Ignore CH AUDIO ?
fiogf49gjkf0d
Skushino,being an avid believer of horn speakers throughout the years,I find myself questioning your findings, as you stated in your posting.Have you finally listened to these speakers? or is it like, beauty is in the eye of the beholder? I own ( now in storage ) a pair of the wooden multi-cell horns sitting on top of my Onken cabinets,and if I had the room right now, they would surely be singing. I have never seen a Company designing this way,but for the vision of setting a new path for others to follow, I believe this company or any other company that dares to cross the standard lines we all have been fed and venture into a new direction, there's something to be said.But! I don't understand when you make statements like to " Ignore the multi-cell and the fact the bass horn is rear-loaded. Ignore the company's claim of using the ceiling and adjacent walls as extensions of the horn " Ignore, Ignore, Ignore, Why?

And lets not forget the Cats reply " Flower Horn" is that all a cat can say?. I know cats like to pee a lot marking their territory, Romy,is not running,just trying to find another place to pee..
09-14-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 105
Post ID: 11734
Reply to: 11733
Another place to pee?
fiogf49gjkf0d

Paragon, what is your problem?

In this thread I do not see anybody advocate any specific ways and no one set any “new path for others to follow”. If you spend time reading this site (and if you are an “avid believer of horn speakers throughout the years” then you must) then you might learn than no one around here care s about others (thankfully) and no one have any interest to set paths for others. Whatever Skushino, me or you say – all of it is wide open for questioning. You find yourself questioning Skushino findings? Good, I question my findings all time. Now let to have reasons…

I do not know what Skushino position about CH Audio horn is.  I do not think he has any position. As far as I know he was stupid enough to live for Afghanistan and nowadays the only interest in speakers he has is to put them under the camel’s legs while he is performing camel’s artificial insemination. Still, the CH Audio were brought very properly as they were some kind of illustration how a speaker use the whole room’s height. I still have no idea what the CH Audio do under MF, if you know then I hope you will elaborate. I do not think that there is a conversation about ignoring and if Skushino decided to do so then why would you care?

My personal interest in thins thread, if you support the company, would be to get from you explanation HOW the CH Audio bass section works in context of the room/environment. If you would like to pass other comments about CH Audio then I would start a new thread dedicated to CH Audio’s ideas.

Cats are territorial, no different than humans, and they very much like humans mark territory, sometimes with urine. They do mostly because the other cats obey the signs….

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-14-2009 Post does not mapped to Knowledge Tree
skushino
Seattle, WA
Posts 93
Joined on 07-07-2004

Post #: 106
Post ID: 11735
Reply to: 11733
Ignore, Ignore, Ignore
fiogf49gjkf0d
Paragon-

You missed the point.  The topic of this thread relates to bass horns inside residential homes.  My post remarked on CH Audio's unique approach to solving this problem.  My comments were unconcerned with listening to this speaker, perceived beauty, or wood multi-cell horns.  

Once again, in context:

My comments:
Focus on the bass horn concept.  Ignore the multi-cell and the fact the bass horn is rear-loaded.  Ignore the company's claim of using the ceiling and adjacent walls as extensions of the horn flare. 

Considered as a solution for fitting a large bass horn in a normal-size living space, this approach has some benefits - extremely small footprint, adequate length to support true mid-bass...

Scott
09-14-2009 Post does not mapped to Knowledge Tree
skushino
Seattle, WA
Posts 93
Joined on 07-07-2004

Post #: 107
Post ID: 11736
Reply to: 11734
The Afghan Camels
fiogf49gjkf0d
Haven't yet seen a camel here.  I don't believe they are indigenous to the region.  It's challenging being away from home, but no carnal thoughts of animals - yet.

bty, my interest in this thread is motivated by solving the same problem.  I need to find a solution for fitting a real, time-aligned mid-bass horn in my listening room.  After obsessing about this for way too long, considering the pros and cons of J-horns, folded horns, wall mounted horns, ceiling mounted horns, and horns hidden in cabinets, I concluded there is no short-cut other than a long, straight horn.

09-14-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 108
Post ID: 11737
Reply to: 11736
Boundaries as an extension of the horn flare.
fiogf49gjkf0d

 skushino wrote:
Haven't yet seen a camel here.  I don't believe they are indigenous to the region.  It's challenging being away from home, but no carnal thoughts of animals - yet.
It was what I heard about you :-)

Your Taxes.jpg

 skushino wrote:
…. Ignore the company's claim of using the ceiling and adjacent walls as extensions of the horn flare. 

Not necessarily. It is a come practice for ¼ size horn to use room boundaries as an extension of the horn flare. I do not know however how it applicable to the CH Audio horn as I have NO IDEA what they did with bass section. I hope the Paragon guy would explain.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-14-2009 Post does not mapped to Knowledge Tree
skushino
Seattle, WA
Posts 93
Joined on 07-07-2004

Post #: 109
Post ID: 11739
Reply to: 11737
Discretion
fiogf49gjkf0d
You have to obey the rules - 'What happens in Afghanistan stays in Afghanistan'!
09-14-2009 Post does not mapped to Knowledge Tree
Paragon
Posts 6
Joined on 09-13-2009

Post #: 110
Post ID: 11740
Reply to: 11737
…. Ignore the company's claim of using the ceiling and adjacent walls as extensions of the horn flare.
fiogf49gjkf0d
CaT,what a come-back Smile  a camel LOL !

I don't know the Company,I was just making a point ,on how easy we knock around others that have new ideas,that was all...But the Cat with the camel,I'm still rolling on the floor over that one......

The Pledge of Allegiance

I Pledge Allegiance to the flag of the United States of America and to the Republic for which it stands,
one Nation under God,
indivisible, with liberty and justice for all.

09-14-2009 Post does not mapped to Knowledge Tree
Paragon
Posts 6
Joined on 09-13-2009

Post #: 111
Post ID: 11741
Reply to: 11735
Considered as a solution for fitting a large bass horn in a normal-size living space,
fiogf49gjkf0d
Scott,thanks I got it now....
09-16-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 112
Post ID: 11758
Reply to: 11190
A small dedicated room - the build history.
fiogf49gjkf0d

A UK guy with name “mrwippy” built a dedicated room for small mini-monitors. I am not a big fun of dedicated rooms but the construction ceremony looks interesting, even I would like do NOT go over it myself…

http://w142.photobucket.com/pbwidget.swf?pbwurl=http://w142.photobucket.com/albums/r81/4will8/d44ecd95.pbw

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-16-2009 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 113
Post ID: 11760
Reply to: 11758
Cost/Benefit
fiogf49gjkf0d
One rarely sees this sort of construction in US, and even less as you travel West.

It looks like a sort of "Pressure Cooker" for certain frequencies, likely requiring some sort of "damping" and other shaping measures in order to get even FR output.

OTOH, it is unlikely that there would be much need to boost much of anything.

This is a legitimate tactic, IMO, but quite expense cost/sq. ft. in USA, relative to more "conventional" local construction.

Neighbors should be grateful, however!

Best regards,
PaulS
09-16-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 114
Post ID: 11762
Reply to: 11760
The perfect built room.
fiogf49gjkf0d

 Paul S wrote:
One rarely sees this sort of construction in US, and even less as you travel West.

It looks like a sort of "Pressure Cooker" for certain frequencies, likely requiring some sort of "damping" and other shaping measures in order to get even FR output.

OTOH, it is unlikely that there would be much need to boost much of anything.

This is a legitimate tactic, IMO, but quite expense cost/sq. ft. in USA, relative to more "conventional" local construction.

Neighbors should be grateful, however!

Well, if somebody were my neighbors then they would have much more to suffer then the esthetics of the catacombs that I might call “home”. A also feel that the UK guys was a bit overboard with the external layer of brisk. For the price I would go for the cathedral two-bend ceilings – the subject of my dream. I do not know about the "Pressure Cooker” - in think it very hard to predict but I think that it is much easy to release pressure then to build it up…

If I build the thing then I have a very clear idea what I would like to have. In fact my local friend has a model of the room that I feel is absolutely prefect to me. I have study my reaction to many different type of ceilings and I concluded that his type of the ceilings is the absolutely best to me. It is some kind of odd pleasure to be in that room and I would like very much to experiment with the similar. It is not large juts about 700 sq feet but with “external”  of suspended midbass horns  I would not need a bigger room

Jim_Room.JPG

Jim_Room.JPG

The cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-16-2009 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 115
Post ID: 11763
Reply to: 11762
Shape vs Construction
fiogf49gjkf0d
The room shape depicted should be relatively easy to load, given that it is in fact rather large, volumetrically, so power to scale must be pre-supposed.

As it happens, my own listening room was a lot like this for 13 years.  2A3 SETs with 97 dB BassZillas sounded toward good, but they were overmatched by that room.

People who are supposed to know claim that parallel floor and ceiling are better than vaults, but I have found it's more often a matter of just staying with it until desired results are achieved.

This room actually looks like an attic, and if that's the case then it would be harder to hold LF than if the floor were a slab or could be shored up.

Re my previous post, neighbors living near the English Bunker should be grateful that the sound could be fairly easily contained rather than shaking the neighborhood during listening sessions.

But distance works great, too, when it is available.

Best regards,
Paul S
09-21-2009 Post does not mapped to Knowledge Tree
tuga


Posts 174
Joined on 12-26-2007

Post #: 116
Post ID: 11795
Reply to: 11762
The harcore approach
fiogf49gjkf0d
If you were to decide on departing from the conventional living(slash)listening-room, you could try adapting the design of La Jolla Neurosciences Institute's auditorium:





I think it would be easy to adjust the ribbed ceiling to something more homely and you could replace the stage doors with the mouths of the midbass horns. The Macondo twins would be place on stage.
Those "gills" on the walls are there to reflect the sound that travels around the periphery of the room to it's center.

Cheers,
Ric


"Science draws the wave, poetry fills it with water" Teixeira Pascoaes
09-22-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 117
Post ID: 11800
Reply to: 11194
Another setup with ceiling horns
fiogf49gjkf0d
Here is another installation where midbass horns are ceiling-mounted. The solution is very elegant but I do not completely agree with it. One of the rules of the game is that lower frequencies shall not be radiated from the space between higher frequencies. So, I would like to see those ceiling-mounted horns to be spread way to the side of the room and the room to be much wider. Also, I would like to see the upper MF and lower MF of this playback inverted – the multi-sell horn goes to bottom and the upper MF goes up.  In the configuration like this the system is begged do an upperbass channel that would sit udders the upper MF. This would allow to drive the multi-sell lighter and to have an upperbass bass would set the sores presence at the floor and would balance out the virtual virtual axis of the playback. I do not think that all of it a problem for this installation as it most likely a relatively far-felid system.  It would be interesting to know also of the owner was trying to deal in any ways with look like substantial time days from midbass….

setup_with_ceiling_horns.jpg

The cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
10-13-2009 Post does not mapped to Knowledge Tree
JoshK
Posts 7
Joined on 10-13-2009

Post #: 118
Post ID: 11959
Reply to: 11800
Another large horn example
fiogf49gjkf0d

I'm sure you've probably seen this before, but here is another example of shoe horning a large horn into a room.

floor_horn.jpg

Discussion of this approach can be found here: 

  http://www.diyaudio.com/forums/multi-way/140190-jean-michel-lecleach-horns-9.html?postid=1779897#post1779897

10-22-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 119
Post ID: 12038
Reply to: 11190
A first interesting find.
fiogf49gjkf0d

I find a house that looks like might be an interesting deal. It is more pricey that I initially thought but it has own interesting moments. The house has a nice near 700sq feet near room with cathedral ceiling that is built atop of double-car garage. The cool parts the one of the garages might be used at bottom-located horns. In this case I have absolutely no limitation about constriction restrictions or the length of the horn and it would be possible to make ½ size 40Hz horn in time alight position. I wonder how difficult to open a few sq meter of floor? Would it compromise the structural quality of the building?  It is reversible? I do not know if I will proceed with this property but it looks very interesting.

The caT


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
10-22-2009 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 120
Post ID: 12040
Reply to: 12038
Steamships vs. Icebergs
fiogf49gjkf0d
It's probable that experienced professionals could open horn holes in that floor and re-build it suitably.  Overall post-surgery structural integrity would depend on particular, site-specific constraints (including the project budget).  It's also probable that serious costs would stem from re-routing electrical, plumbing, HVAC and other things not immediately visible from above (or below) .

It should all be +/- reversible.



Best regards,
Puls
10-23-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 121
Post ID: 12043
Reply to: 12038
The absolute minimum dimensions and the 'new' attic ideas.
fiogf49gjkf0d
Looking at different properties and trying to in my mind to arrange the setting in my new listening room I have concluded the absolute minimum dimensions of the room. In case the midbass horns are NOT in the room, the room has over 12” or a cathedral ceiling and Macondo is more or less just replicated in larger space then I think the reasonable minimum dimensions of the room I would like to be 19-20 by 25 feet. My estimate suggests that 17’-18’ rooms are too narrow for my goals; again I am talking about the bare minimum. The larger room with 25’ with and more are fine but still Macondo will be installed in 19’ width footprint.

About an ideal solution. From what I have seen the very cool setting would be to have 23 by 30 feet room with cathedral ceiling with high pitch attached to a “conventional” roof house. The conventional roof house has triangular roofs with attic and when the cathedral ceiling meets the triangular roofs of conventional house then the space of attic shape a wall on the back of the cathedral ceiling room. This wall in my view is a phenomenal location to install the back fairing midbass horns in very much time-align configuration.

Horns_At_attic.JPG




"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
10-23-2009 Post does not mapped to Knowledge Tree
miab
Canada
Posts 46
Joined on 02-07-2008

Post #: 122
Post ID: 12044
Reply to: 12043
Condensation issue's in Boston
fiogf49gjkf0d
Since your drivers would contain metal and your are mounting them in an unconditioned space, the warm air (in winter) from the conditioned space ( the listening room) would condense on the the first cold surface within the horns. The wood horn would also condense on the inside but you might not be so concerned as the drying factor and tolerance of wood/plywood to moisture is not as critical as metal. You must contain the entire horn and driver within conditioned space. This would effectively (because the horns are so large) turn the attic into conditioned space. Even if you insulated the horns on their exterior surface, in summer because of interior air conditioning, condensation would collect on the exterior of the horn under the insulation. That is even worse because the moisture would be trapped with no drying factor. Ideal the home would be entirely cathedral ceilings and you can create a partition if necessary to isolate your sound room. Nothing wrong with horns hanging above the dining room table or the bedroom in the other room?Smile
Turning the attic into condioned space is straightforward. Remove insulation in ceiling joists and polyurathane the underside of the roof leaving 1" or 2" of breathing space from soffit to a ridge vent at the peak. But if going through this trouble might as well open the ceiling to view the presumably lovely horns.
10-23-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,049
Joined on 05-28-2004

Post #: 123
Post ID: 12045
Reply to: 12044
An active thermo-stabilized blanket around back chamber?
fiogf49gjkf0d

Miab, I have very limited knowledge in construction techniques, moist prevention and how all of it might affect a big horn. My very uneducated production suggests me that it is not truly a bid deal, but of cause if go this route then I certainly will consult with specialists.

Still, the back of the horn is sealed, with strong walls. What is differences my driver sit not in box in not climate controlled storage or if it sit inside the horn in attic” I think it the same. In fact in horn it has some ventilation via the mouth. Yes, attic cone run very hot (bad for ALNICO magnets) and might go cold. The cold 15” driver would have stiffer suspension and different Fs and Q. Still, I do not think that it might be terminal or dangers for a driver.

Nevertheless, it might be a good idea to THINK about it. Perhaps it would make scene if the driver in attic or outside to put whole back chamber in thermo-protective cocoon? There are some polymers that can run hot or cool from very low voltage and I have seen some thermo-stabilizing pad were made with them. I guess they might exist in shape of blanket… A good idea to think about it is the back chamber will be exposed.

My primary concern is not driver but the horn itself. If it will be attic and let say 12 feet horn will be made from “young” wood then after a year of sitting in attic the wood will be “loosing it’s youth” and the horn would need some “help”. I do not know, I need let professions to consult me about it.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
10-23-2009 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,570
Joined on 10-12-2006

Post #: 124
Post ID: 12047
Reply to: 12043
Costs, Expectations and Open Space
fiogf49gjkf0d
Miab is correct about condensation issues and the need to consider what will go into conditioned vs. unconditioned spaces.  And how much it costs will be decided by typical local costs for the project in question, with no consideration whatsoever for lay "expectations".  It's generally lots cheaper to get professional estimates before committing to such a project.

Re: "Vaulted Ceilings"...

Is THE STRATEGY still to "overload" the room (or to at least have the capacity to do so, cleanly)?

I have gotten good-ish results with a small-ish 1/2-vaulted room, but the vaulting is like a mirror of the sprung floor in that it tends to have "effects" on the sound.

Of course I have no idea how much energy your current system produces.  I ass-u-me from reading along that it produces many times what I have (and this to better effect...).  Regardless, if the goal is to really load the room, then beware of the high, vaulted ceilings.  Sure, space around the speakers can be wonderful; but too much dead space can be deadly.

Best regards,
Paul S
10-23-2009 Post does not mapped to Knowledge Tree
miab
Canada
Posts 46
Joined on 02-07-2008

Post #: 125
Post ID: 12049
Reply to: 12047
Demise of the r2000 home
fiogf49gjkf0d
Be very carefull in the advice taken from 'professional opinions'. Be as skeptical of these opinions as you are of audio opinions. In construction, maybe more than audio, everyone thinks their opinion is gold. Even city codes are often incorrect when it comes to moisture control in construction. Case in point. Early R2000 homes which were all the rave of the 70-80's have a lifespan in some cases of 20-30 years. In their quest for insulating value without proper thought of moisture control this homes actually rotted from inside out. Where as some 200 year old barns are still standing because of their drafty and drying factor nature. Joseph Lstiburek, could be considered a leading professional in this respect.

http://www.amazon.com/exec/obidos/search-handle-url/ref=ntt_athr_dp_sr_1?%5Fencoding=UTF8&sort=relevancerank&search-type=ss&index=books&field-author=Joseph%20Lstiburek

What you are suggesting is much different then storing drivers in attics. There is no temperature difference plane where the driver is stored. Special consideration must be taken where cold meets warm. At that point there is a condensing potential. Air barrier is just as imprtant as insulation barrier.You MUST properly engineer a drying mechanism into your construction. A blanket of insulation alone will not suffice. I wouldn't make it a big deal if it were not for the delicate nature of a sound driver (paper, aluminum, voice coil thin copper...). If it was just bulk structure..even early r2000 homes outlasted their original owners. It's the second or third that got the surprise.

If it was me. Condition the attic space as you would your home with all construction changes needed. Or polyurethane foam spray (thickly) the entire horn and driver back but you would have to create an access door to your driver that would need fine detailed workmanship. This takes care of both vapour (air) barrier and insulating value plus would allow you to manipulate the resonance of horn.
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