OK, the preceding thread what I research the subject of Midbass Horns and Real Estate have finished with great success.

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=11190

I found and got a house that I like very much and the house has a lot of good Midbass options. Even though the listening room does not sound at the level I would like it to be but I feel that it is normal. I did not work with room too hard as I am doing remodeling of house nowadays; you know how it works… The room will sound much better what I turn my full attention to it.

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PostID=13235

However, as I concluded in the room thread above the Macondo needs a help of extra Midbass channel – so, with all theoretical  formal brainstorming the Midbass Project  will we my very next audio project as soon I return to audio full time. I have made today an inventory of drivers that I might use for Midbass Project. I have a lot, perhaps 18 drives that I might choose from.  I have a DSET that will be driving the channels. I have found a carpenter with skills and equipment who will be able to help me. I have a budgeted the project and have the carpenter agreement to work off this budget.

I started this thread as a dedicate recourse where I will be posting about the project’s thoughts, ideas, progress and results. Perhaps I started this thread to have an additional encouragement to actually start the project.

Probably the next month I will be assessing different option – where I will be building the Midbass channels, what kind it will be and how it will be integrated with room. Of cause it is not secret that the Midbass horns are at a very stop of my short list of option but I will evaluate all opportunities.

I always was dreaming about dedicated Midbass channels. I also have absolutely clear vision how I would like them to sound – in fact the exactness of this vision is even scares me. Went I listen my Macondo now I know absolutely precisely when and how the Midbass channel’s Sound shall be introduced. All that I need is juts to do it…

jessie.dazzle wrote:

I realize the question as to how you will get mid-bass (horns vs other solutions) is still open. If you do go ahead with horns, you should be able to make them so that they'll accept most any 15" driver, which means you could use the horns in making the decision on drivers. If you go with some sort of direct radiating enclosure, then you'll likely have to decide on drivers ahead of time in order to get the volume of the box right for the driver.

Nope, it is not the question that I faced. I very much down that I go for any form of direct radiation.  Most likely it will be a pair of horns but I am trying to forecast WHAT kind horn they might be and HOW they will interact with the room. Ironically I have multiple options. Yes, the midbass horns might be in front wall, in side walls, in back wall above (attic), from basement, and even stand-alone in the room. I need to select one direction that I will be attacking. I think it will take for me a month or so to figure the things out.

Looking that my attic place is very much triangle I am contemplating an experiment with triangular horn. The idea that lead me there was Balalaika. Balalaika is Russian 3-strings musical instruments that has unique sound. One of the attribute of the unique is that it is really loud. The reason is that the deck is triangular and opposite walls have no reflections. So, the sound entering the deck get infinitely reflected.  Balalaika has own compressed and a bit “closed” sound but it wanted to be wide bandwidth – something that I do not need and against.

http://en.wikipedia.org/wiki/Balalaika

I wonder why do not used the same idea somehow for a construction of a horn? Any brainstorming ideas are welcome. For the encouragement here is Russian Balalaika master Aleksei Arkhipovsky plays 1928 instilment.

I think if everything goes as I planed then this month I will start my Midbass Horn project. I thought to do it later but I am too sick and tired without my main playback – so, I would rather to do it sooner than later. At present time I am strategizing what it will be, of course the attic solution is leading all the way, no wonder as I was buying this house with this intend.   If you look at the Page #8 of the Midbass Horns and Real Estate thread then you refresh the idea.

http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=9&PostID=11190

Here is how the “Triangular Wall” looks like – the horns will be on this wall (where the air-conditioning ducks now)…. In the time alight position, invisible in the room and now screwing the room decor- God, will I be able to do it – the dream of idiot might come through!!!

Later on this month I will have a framing specialist to inspect my attic and give me the numbers: how much space I will have. This will greatly determine what kind horn I will be building. Meanwhile the following question I am contemplating:

1)      Each horn will be 2-4 sections, so where to slice it? If we presume that section would have own resonance then what would be a difference between 5-5-3 feet and 4-4-4 feet? Probably it would be a good idea to have all section of different length. However, why the different length but not the length mass of the each section? I think I will go for different length and different mass but I still will think about it. I would like one section to me master and the rest sections to be slaves - from resonant perspective. This will give a further control after the horn is built and installed.  I still think how I would do it….

2)      The wall’s type material. This is complicated. The leading idea is to use two layers of plywood of different thickness and to position the layers perpendicular. Then the question is: what guy to use? Then the question is if to bolt the layers. Perhaps not to bolt but to use the wood-made screws…

3)      The material itself – what to use. I am wide open from any type of wood to synthetic panels (like cement panels). Perhaps it might be a combination of organic and synthetic layers.

4)      To make horn from the same material of to make different section from different material.

5)      Where to buy the material in bulk quantities? I have budget the cost of horns materials around $1000

I would like to have my answers to those strategic questions before I will start drawings…

May I at least ass-u-me that you plan to high pass these horns? If so, go ahead and figure that in, too. In any case, just looking at 70', impedance is not the only number you'll be running up, and the last place you want this load is for LF channels. I'd try to find a way around it.

Did you ever say how the "multi-channel" aspect of your newly enhanced Placette works? The idea would be to eat as much of the distance as possible with fully buffered lines while still allowing the amps to be "safe", perhaps even visable. Anything you could do to shorten the LF speaker cables would be a plus.

And I 2nd the cheap mock-up, to start, or at least try to think of a way to break the project into stages, to avoid the expensive disaster.



Best regards,
Paul S

Romy the Cat wrote:

.....the idea of the triangle horns with some kind of location of the drivers is what I was thinking as well.

Where to choke the corner? It is not so simple question as one might think. The choke will be let say a few inches from the mathematical corner and will be in parallel to the opposite wall. It might be a foot or so wide surface. By having this surface it will create a standing wave in the belly of the horn. so, my point is following: if is possible to manage the region what the corner will be cut and the surface of the choke in order to inflict the predictable and desirable LF amplitude modulation in the horn bypass.

This is very-very interesting subject. I do not know how to circulate it but I think it might be effective. The horn rate the horn profile, the surface of the choke and the distance between the choke and the opposite wall – all of it shell be considered and I think it create a permanent equalizing inflection. It would be possible that in the installed and operating horn I could add the corner chokes of the different size and make the fine tuning of the horn response…