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  »  New  45Hz Bass Horn..  Can We Ever be Saved From Ourselves?...  Horn-Loaded Speakers Forum     23  227179  09-19-2006
  »  New  8" Goto Woofer for 60Hz Horn..  It's not a Goto 8in driver...  Horn-Loaded Speakers Forum     5  57558  11-03-2008
  »  New  The Macondo’s Upper Bass Channel: what is next?..  Görlich again...  Horn-Loaded Speakers Forum     30  186056  10-28-2007
  »  New  Jessie Dazzle Project..  Will this better to be auditable?...  Horn-Loaded Speakers Forum     172  1067259  08-03-2007
  »  New  Romy The Cat's new Listening Room..  Won't be the last time he makes that trip!...  Audio Discussions  Forum     478  1780436  03-28-2010
  »  New  Problems with horns: upper bass ..  Must it be about loading?...  Horn-Loaded Speakers Forum     109  824369  03-25-2005
  »  New  Midbass Horns and Real Estate...  Just a youtube video......  Horn-Loaded Speakers Forum     247  1440578  07-26-2009
  »  New  Macondo’s lowest channel...  The ULF amp Itch....  Horn-Loaded Speakers Forum     146  898554  09-15-2010
  »  New  Practical Guide for Back Chambers Tuning...  Back chamber’s cost-benefit....  Horn-Loaded Speakers Forum     5  48210  10-21-2006
  »  New  Superbly interesting effect: Suspended decoupled floor ..  Superbly interesting effect: Suspended decoupled floor ...  Playback Listening  Forum     0  11874  10-08-2010
  »  New  Midbass impedance bumps -- why and what to do?..  You need to stop deceive yourself....  Horn-Loaded Speakers Forum     18  128840  10-21-2010
  »  New  Mystery of bass horn calibration: Radiating Surface Dee..  Mystery of bass horn calibration: Radiating Surface Dee...  Horn-Loaded Speakers Forum     0  11266  02-03-2011
  »  New  Impulse response, short notes and midbass horns...  A possible solution to better impulse?...  Horn-Loaded Speakers Forum     14  81098  06-13-2011
09-16-2010 Post does not mapped to Knowledge Tree
jessie.dazzle


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

Post #: 281
Post ID: 14468
Reply to: 14466
Toxic lube
fiogf49gjkf0d
Scooter wrote:

"...I have seen silicone and other petro-based products in contact (or proximity via vapors) to cause certain foams to break down over a period of several years. They might have a similar negative impact on driver components and bonding agents..."

I have to admit, I'm sort of totally off my first proposal which involved mold release agents; I'd address the stuffing issue with an approach more like my second proposal (option II above). Much cleaner and easier to adjust.

However, Scooter is absolutely correct, especially with regard to petroleum-based products. This is why they are not used with condoms... And why Astroglide rules!

As Romy has only one day left, I was trying to come up with an easy to find release agent.

If spray can foam must be used, then why not spray it directly into several smaller plastic sacs (still mixing it with the chunks of cut up foam as previously described)... The mix will expand in the sac and take the form of the rear chamber... That way no mold release is necessary. 

In cases where its absolutely necessary to use a release agent near potentially vulnerable materials, real silicone, if you can find it and pure bee's or carnauba wax would be fine (hard as hell though... Need to heat it); avoid the liquid waxes which are 75 petro-solvent (even Johnson's industrial paste floor wax has a fair amount of solvent). Though I hesitate to recommend it, a thin film of vegetable oil might also do the trick; partially hydrogenated if a paste form is desired (better known as Crisco).

There are other fancier solutions, such as liquid polyvinyl acetate, or PVA (synthetics suspended in alcohol, available at places that serve what's left of the tool and die industry).

Otherwise, there's always Astroglide!

jd*


How to short-circuit evolution: Enshrine mediocrity.
09-16-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 282
Post ID: 14469
Reply to: 14467
The first final coat of paint is applied.
fiogf49gjkf0d
We mixed textured paint and use color of the room’s wall. In the small test surface it looked fine but inside horn, in the large surface, it looks spectacular. I am even surprised how pleasant it feels; at least I like it a lot. The idea was to use second coat of paint none-textured, to smooth the texture of the first coat but I think we will put the second coat textured as well – it looks just perfect to my taste.

Midbass_progress_99.JPG

The Cat

PS: pay attention that the top diagonal 2x4 of the mouth is not glued yet – it is intentionally.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 283
Post ID: 14470
Reply to: 14468
The back chambers are done.
fiogf49gjkf0d

OK, now I am happier as I did my duty and the back chambers are ready to be attached to the horns and to be lifted up. Yesterday I spent 5 hours trying to build the back chamber displacement that Jessie and my carpenter recommended me. I bought the 2 large sheets of 2” foam, cutting it on table saw and by foam cutter. I was able to make a fine displacement but then I asked myself how effective was it. If you remember when I was experimenting with resonant frequency in basement I was taping the entire back of the horn and it was where I was able to get the rise of the resonant frequency that I was needed. The displacements that I built allowed a bit more air around the driver. I measured resonant frequency in the driver with and without displacement. It was 4Hz difference - obviously not enough. I re-did the displacement to make it as tight as I could but surprisingly it did not affect the resonant frequency rise.

I was in near panic mode as it was 6PM and I have no solution to finish my back chambers and I have only a day left.  Probably if I had softer foam then it would be possible to press the foam to the driver but I had relatively hard pink Owens Corning phenoplast. I decided that there is no way to do it properly without going directly to the driver.

At that time I learn the spay foams that I use relatively well – I knew how it expends and how it cures. So, I covered the basket vents with very thick fabric, the driver with masking tape and begin to apply the foam directly to the driver. This time I did it one thin layer of foam a time with 40 minutes delay between the layers. Between minute 5 and 10 of foam curing I used hard surfaces to punch foam down in order it to fill all inner gaps.  I did it pretty my up to 5AM, with both horns and it looks as it worked very well. The foam built a true sarcophagus around the drivers, converting my 15-40 to a true compression driver. The resonant frequency on the driver in sarcophagus is 67Hz – much heir rise than it was with phenoplast displacement (54Hz). To remove the driver for this type of displacement will be a bit more difficult but not impossible – foam is very easy to cut with knife. My only fear was the foam might push the fabric out and touch the driver cone. I made some precisions, like let the layers that fill the fabric to dry longer   and do not puck them down to hard.  I still have no 100% assurance that it did not happen. I hope not as the distance from the basket window to the diaphragms is large. Also, I did the drivers sweep and Fs measurements.  The sweeps is clear and the Fs are identical. I presume if one of the cones would be touched by foam then it would impact resonant frequency very dramatically.

Now some considerations.  I do not share the Scooter’s and jessie’s fear about the toxicity of petro-based products. Yes, petro-based products are not good near driver but I do not think that I spayed driver with gasoline. I did a test and confirm that foam doe not penetrate the fabric I used. Foam does not make it soggy or wet. I used fabric from think tarp. Foam does not have fume or gas and when it cures it absolutely inert to any organic things. It is not to mention that the cone was under the foam (in case of fume) and separated with very thick fabric. So, I do not think that any damage or impact was done to driver. I think that sitting form years in weather non-stabilized storages might make more damage to it. Of course you never know, but I do not think that 10 min proximity to uncured polyurethane foam did anything to the driver diaphragm.

Anyhow, now the back chambers are done and the 40 bags of sand (300 pounds) are prepared to be loaded to the horn’s top. We are back on the schedule. When the horns will be installed I will fine-tine the Fs by pocking the small holes in the foam.

Midbass_progress_100.JPG

Midbass_progress_100.JPG

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Midbass_progress_100.JPG

Midbass_progress_100.JPG

Midbass_progress_100.JPG

Midbass_progress_100.JPG

Midbass_progress_100.JPG




"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-17-2010 Post does not mapped to Knowledge Tree
guy sergeant
United Kingdom
Posts 258
Joined on 08-03-2004

Post #: 284
Post ID: 14471
Reply to: 14470
67Hz ?
fiogf49gjkf0d
Can you remind us how & why you arrived at the resonance frequency you have set for these drivers in this particular horn?

09-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 285
Post ID: 14472
Reply to: 14471
Can you remind us....
fiogf49gjkf0d

 guy sergeant wrote:
Can you remind us how & why you arrived at the resonance frequency you have set for these drivers in this particular horn?


67Hz is the resonance frequency of the complete back chamber and driver loaded ONLY to the first section. What it will be load to the rest 6 sections then the new mass of the diaphragm will be much higher and the resonance frequency will be much lower, hopefully around 42Hz but I will fine tune it later. The rest is here:

http://www.GoodSoundClub.com/TreeItem.aspx?PostID=14341

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
09-17-2010 Post does not mapped to Knowledge Tree
scooter
Posts 161
Joined on 07-17-2008

Post #: 286
Post ID: 14473
Reply to: 14472
Nil risk
fiogf49gjkf0d
"quote" I do not share the Scooter’s and jessie’s fear about the toxicity of petro-based products. Yes, petro-based products are not good near driver but I do not think that I spayed driver with gasoline. I did a test and confirm that foam doe not penetrate the fabric I used. Foam does not make it soggy or wet. I used fabric from think tarp. Foam does not have fume or gas and when it cures it absolutely inert to any organic things. It is not to mention that the cone was under the foam (in case of fume) and separated with very thick fabric. So, I do not think that any damage or impact was done to driver. I think that sitting form years in weather non-stabilized storages might make more damage to it. Of course you never know, but I do not think that 10 min proximity to uncured polyurethane foam did anything to the driver diaphragm.


Romy's intuition is reasonable in my experience. I believe that the real risk was foam breaking down over time from coming in proximity with silicone or other petro-based products. The likelihood of speakers having a negative reaction to just foam which largely rapidly cures is nil in my view.

09-17-2010 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,104
Joined on 10-12-2006

Post #: 287
Post ID: 14474
Reply to: 14473
Chemical Wasteland
fiogf49gjkf0d
Gas-off and chemical "incompatibility" are, in fact, real problems in situations similar to this one.  I am NOT saying that a particular foam gives off a gas over time that can break down or stiffen or crystalize rubber, adhesive or composite materials; but I have certainly seen it happen.  Of many, I offer the example where the glazing compound used by many window manufacturers proved incompatible with the compound used by the glass companies to space and tie together glass panes for dual-glazed windows.  And I well remember problems with some of the foams we used years ago.  It is always a good idea to have some idea of what is going into one's soup.

Best regards,
Paul S

09-17-2010 Post does not mapped to Knowledge Tree
tuga


Posts 174
Joined on 12-26-2007

Post #: 288
Post ID: 14475
Reply to: 14470
Sand.
fiogf49gjkf0d
 Romy the Cat wrote:
Anyhow, now the back chambers are done and the 40 bags of sand (300 pounds) are prepared to be loaded to the horn’s top. We are back on the schedule. When the horns will be installed I will fine-tine the Fs by pocking the small holes in the foam.


Sand is a good decoupler.
The Incas built their massive solid stone buildings above sand + gravel foundation to absorb the energy of their quake prone homeland.

It was also used by the Jews in Iberia during the Inquisition days: they would spread it on the floors of their synagogues supposedly to avoid getting heard during religious services.

Cheers,
Ric


"Science draws the wave, poetry fills it with water" Teixeira Pascoaes
09-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 289
Post ID: 14476
Reply to: 14475
Not decoupler but damper.
fiogf49gjkf0d
Ric, I will not be using sand for decoupling. In fact I fill that sand is not good load bearing decoupler as I will have more or less point loading and sand will not work. I will be using sand for damping the horn surface, primary atop of the horn. As a damping material I fill sand has no rivalry.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 290
Post ID: 14477
Reply to: 14470
Almost ready, so far the tampons sound good.
fiogf49gjkf0d
The horns are painted with final coats. 240 feet of superb 6ga cable laid out to connect the horns (on the picture below). The sand bags sealed. The final bridges on the attic are built. The horns are almost ready to move up. I just need to hang the back chambers. There is an interesting twist….

The back chambers are sterile and I paid a lot of attention to assure that it will be absolutely no dust or any partials in back or front chambers. I even built a small foam tampon to plug into the second section during the lifting up to assure that it will be no accidental dirt goes into front chamber (you can see them on the picture, the tampons are green). Since the tampon will not be able to be remove if the first section is attached I run a rope from the tampon to the mouth of the horns, to yank the tampon out what the game will be over. Now it the kinky think. The think rope that attached to tampon and goes over the whole horn makes a hell of contrabass. Stretching the rope and playing it sitting a few feet from the horn mouth make it sound very magic. It is not loud but very low and very beautiful.

Midbass_progress_108.JPG

Midbass_progress_109.JPG




"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-17-2010 Post does not mapped to Knowledge Tree
oxric
Posts 184
Joined on 02-11-2010

Post #: 291
Post ID: 14478
Reply to: 14470
This project is on fire!
fiogf49gjkf0d
 Romy the Cat wrote:

OK, now I am happier as I did my duty and the back chambers are ready to be attached to the horns and to be lifted up. Yesterday I spent 5 hours trying to build the back chamber displacement that Jessie and my carpenter recommended me. I bought the 2 large sheets of 2” foam, cutting it on table saw and by foam cutter. I was able to make a fine displacement but then I asked myself how effective was it. If you remember when I was experimenting with resonant frequency in basement I was taping the entire back of the horn and it was where I was able to get the rise of the resonant frequency that I was needed. The displacements that I built allowed a bit more air around the driver. I measured resonant frequency in the driver with and without displacement. It was 4Hz difference - obviously not enough. I re-did the displacement to make it as tight as I could but surprisingly it did not affect the resonant frequency rise.

I was in near panic mode as it was 6PM and I have no solution to finish my back chambers and I have only a day left.  Probably if I had softer foam then it would be possible to press the foam to the driver but I had relatively hard pink Owens Corning phenoplast. I decided that there is no way to do it properly without going directly to the driver.

At that time I learn the spay foams that I use relatively well – I knew how it expends and how it cures. So, I covered the basket vents with very thick fabric, the driver with masking tape and begin to apply the foam directly to the driver. This time I did it one thin layer of foam a time with 40 minutes delay between the layers. Between minute 5 and 10 of foam curing I used hard surfaces to punch foam down in order it to fill all inner gaps.  I did it pretty my up to 5AM, with both horns and it looks as it worked very well. The foam built a true sarcophagus around the drivers, converting my 15-40 to a true compression driver.



Hi Romy:

I have been following your mid-bass horn project with a mixture of fascination and horror for a little while and am awed by the remarkable amount of creative thinking that has gone into it.

I am sure there is no need to worry but I would hate for you to do some really serious damage to the drivers you are using. The 'vents' at the back of the Vitavox drivers are presumably there to ensure there is some amount of convection present to cool down the coil as 95% of the power used by the driver tends to be transformed to heat. I may be talking out of ignorance but I would be concerned with the 'sarcophagus' method you have employed to reduce rear chamber volume to virtually nil.

Also, when cooling by convection cannot take place, the heat will be transferred to the rest of the unit by conduction so that that chassis temperature
might rise considerably and I do not know enough to comment on the effect of high temperatures on the fabric and masking tape you are using.

In any case, operation of the coils at high temperatures, if present may well adversely affect the performance of the drivers when they are called into use for extended durations depending on volume and musical content.

Good luck (you may need it)
Rakesh
09-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 292
Post ID: 14482
Reply to: 14478
Sarcophagusing the driver…
fiogf49gjkf0d

 oxric wrote:

Hi Romy:

I have been following your mid-bass horn project with a mixture of fascination and horror for a little while and am awed by the remarkable amount of creative thinking that has gone into it.

I am sure there is no need to worry but I would hate for you to do some really serious damage to the drivers you are using. The 'vents' at the back of the Vitavox drivers are presumably there to ensure there is some amount of convection present to cool down the coil as 95% of the power used by the driver tends to be transformed to heat. I may be talking out of ignorance but I would be concerned with the 'sarcophagus' method you have employed to reduce rear chamber volume to virtually nil.

Also, when cooling by convection cannot take place, the heat will be transferred to the rest of the unit by conduction so that that chassis temperature
might rise considerably and I do not know enough to comment on the effect of high temperatures on the fabric and masking tape you are using.

In any case, operation of the coils at high temperatures, if present may well adversely affect the performance of the drivers when they are called into use for extended durations depending on volume and musical content.

Good luck (you may need it)
Rakesh

Rakesh, I never thought about it, good thinking. You might be right, in fact it might explains why some bass horns might sound soft. If the back chamber is sealed and the horn used as a compression driver then presumably the temperature of the VC would rise and raise the temperature of the magnet. If you remember in the thread about electromagnets a guy from Belgium I believe told that he have evidences (and I believe him) that as filed coil warms up the driver the temperature make the driver to sound soft. Do you see a possible connection?

I agree that sarcophagusing the driver into the foam cocoon I reduced the capacity of the driver to dissipate heat. I would not say that I did it deliberately –I just did not think about it and it was the only way to do the back chamber within the time frame. Still, analyzing the problem now I would bring to the table the following arguments.

1)  Putting the driver into foam reduced or eliminate the exposure of the driver to attic heat (very hot on summer) and cold

2)  Considering the very high efficiently of the channel the driver will use very low power (probably no more than 3W) and with this power the heating up of the VC will not be a subject at all.

3)  The horn has a large front chamber that will be able to cool down the driver

4)  The Vitavox driver use Alnicko magnet that has higher temperature resistance then other magnets

(table 5.2 at http://www.magnetsales.com/Design/DesignG_frames/DesignG_2.htm)

So, I think, or more precisely to say hope, that the het from VC would not be a problem. On summer the attic is so hot that you can cook pizza in there. The VC would generate this heat long after the VC will be melted. So not forget that this is very rare and very low power driver with no cone excursion. The driver has name Vitavox 15/40, 15 is impedance, 40 is max power that the driver can handle. So, considering very low power that I will feed the driver I think the VC’s hear will not be a subject.

Anyhow, thanks for warning, I did not think about it and in case the driver handle 300W-400W then the CV venting would be certainly an issue.

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
09-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 293
Post ID: 14483
Reply to: 13597
OK, they are ready to fly tomorrow.
fiogf49gjkf0d
The back chamber are installed, the horns are fully assemble and ready to be hoisted tomorrow. I will go to bad today playing…. Here are a few shots for history as if it fly tomorrow into attic then it never will be seen. On the last image you might see the large prefaces atop of the horn not covered with braces –this is where the bags with sand will be laid….

Jully16 – September 17… two months of life…

Midbass_progress_110.JPG

Midbass_progress_111.JPG

Midbass_progress_112.JPG

Midbass_progress_113.JPG



"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-18-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 294
Post ID: 14484
Reply to: 14483
Midbass horns: “Ready for Liftoff”
fiogf49gjkf0d

MidbassHorn_ReadyForLift.jpg




"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-18-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 295
Post ID: 14485
Reply to: 14484
The midbass hoisting ceremony: just pictures.
fiogf49gjkf0d

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"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
09-18-2010 Post does not mapped to Knowledge Tree
noviygera


Chicago, IL
Posts 137
Joined on 06-12-2009

Post #: 296
Post ID: 14486
Reply to: 14485
Monument
fiogf49gjkf0d
Hey Romy...

Fucking, AMAIZING.
There needs to be some king of a state monument provision for accomplishments like that. I am damn excited.

-Herman
09-18-2010 Post does not mapped to Knowledge Tree
Dominik
Poland
Posts 48
Joined on 09-14-2008

Post #: 297
Post ID: 14487
Reply to: 14485
Stuning...
fiogf49gjkf0d
This is most stuning space arrangement with horns I ever seen.
If they sound like they look... Oh man
 
09-18-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-27-2004

Post #: 298
Post ID: 14488
Reply to: 14485
The sheetrock-horn interface.
fiogf49gjkf0d
OK, on Monday my carpenter will do all necessary work to fine align the horns, to tight and to solidify what need to be.  The framework with horn will be over and on Tuesday he will cover the things with sheetrock (drywall) and begin to apply the finishing plaster.  This brings a subject about which I have no judgment yet.

The horn will be shaking – that is fine, but drywall and the drywall’s plaster will be stationary. So, I fell it will be recipe for future drywall crack. So, I wonder it is possible to put between peripheral of the horn and drywall a some kind of elastic compound or some kind of semi-flexible spider? My carpenter proposes silicon but it not good for painting. Is anybody have any interesting idea how to separate horn and drywall?

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
09-19-2010 Post does not mapped to Knowledge Tree
tuga


Posts 174
Joined on 12-26-2007

Post #: 299
Post ID: 14490
Reply to: 14476
Reflections (sound)
fiogf49gjkf0d
 Romy the Cat wrote:
Ric, I will not be using sand for decoupling. In fact I fill that sand is not good load bearing decoupler as I will have more or less point loading and sand will not work. I will be using sand for damping the horn surface, primary atop of the horn. As a damping material I fill sand has no rivalry.


Yes, you'd have to add some large feet to your horns for it to work.

The finalized setup looks very nice, both in acoustical and aesthetic terms!
I am curious as to whether having all other drivers firing into the those large funnels will produce any strange reflections or echos.

Best,
Ric


"Science draws the wave, poetry fills it with water" Teixeira Pascoaes
09-19-2010 Post does not mapped to Knowledge Tree
el`Ol
Posts 225
Joined on 10-13-2007

Post #: 300
Post ID: 14491
Reply to: 14488
Acrylate
fiogf49gjkf0d
 Romy the Cat wrote:

My carpenter proposes silicon but it not good for painting. Is anybody have any interesting idea how to separate horn and drywall?


There is acrylate paste that is quite similar to silicon, but can be overpainted.
Page 15 of 23 (456 items) Select Pages:  « First ... « 13 14 15 16 17 » ... Last »
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  45Hz Bass Horn..  Can We Ever be Saved From Ourselves?...  Horn-Loaded Speakers Forum     23  227179  09-19-2006
  »  New  8" Goto Woofer for 60Hz Horn..  It's not a Goto 8in driver...  Horn-Loaded Speakers Forum     5  57558  11-03-2008
  »  New  The Macondo’s Upper Bass Channel: what is next?..  Görlich again...  Horn-Loaded Speakers Forum     30  186056  10-28-2007
  »  New  Jessie Dazzle Project..  Will this better to be auditable?...  Horn-Loaded Speakers Forum     172  1067259  08-03-2007
  »  New  Romy The Cat's new Listening Room..  Won't be the last time he makes that trip!...  Audio Discussions  Forum     478  1780436  03-28-2010
  »  New  Problems with horns: upper bass ..  Must it be about loading?...  Horn-Loaded Speakers Forum     109  824369  03-25-2005
  »  New  Midbass Horns and Real Estate...  Just a youtube video......  Horn-Loaded Speakers Forum     247  1440578  07-26-2009
  »  New  Macondo’s lowest channel...  The ULF amp Itch....  Horn-Loaded Speakers Forum     146  898554  09-15-2010
  »  New  Practical Guide for Back Chambers Tuning...  Back chamber’s cost-benefit....  Horn-Loaded Speakers Forum     5  48210  10-21-2006
  »  New  Superbly interesting effect: Suspended decoupled floor ..  Superbly interesting effect: Suspended decoupled floor ...  Playback Listening  Forum     0  11874  10-08-2010
  »  New  Midbass impedance bumps -- why and what to do?..  You need to stop deceive yourself....  Horn-Loaded Speakers Forum     18  128840  10-21-2010
  »  New  Mystery of bass horn calibration: Radiating Surface Dee..  Mystery of bass horn calibration: Radiating Surface Dee...  Horn-Loaded Speakers Forum     0  11266  02-03-2011
  »  New  Impulse response, short notes and midbass horns...  A possible solution to better impulse?...  Horn-Loaded Speakers Forum     14  81098  06-13-2011
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