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05-16-2019 Post does not mapped to Knowledge Tree
noviygera


Chicago, IL
Posts 158
Joined on 06-12-2009

Post #: 1
Post ID: 25424
Reply to: 25424
Short midbass horns
I used to have Edgar 80hz straight horns and this was my only experience with short midbass horns. I did not like them in my system and sold them. Lately, I have been wondering about these designs in general and is there such a thing as a good sounding short mb horn? What I like about this concept is the time alignment that is possible with the midrange horn of similar length but other than that, what is the idea behind such a concept and is there an optimal application for them?

All I understand is that it is not a true horn but more like a waveguide for the midrange so in this case it should have a slight advantage over direct radiator but what do people think about these and is this just a gimmick? To me, the main point "should" be to cover around 80-500hz and have some advantage over similar bandwidth direct radiator. Is there?

It is easy to say they don't work but why? Or if they do, how?
05-16-2019 Post does not mapped to Knowledge Tree
rowuk


Germany
Posts 274
Joined on 07-05-2012

Post #: 2
Post ID: 25425
Reply to: 25424
It is all in the definition
The short horns like with the Altec are horns, but being too short and generally with a truncated mouth, they do not eq very much in the “midbass”, rather an octave or two higher. In that case, you might as well use direct radiators. The reason for a midbass horn is because the midbass is where large acoustic music has the most power requirement. Romy had the midbass horns in his last place, but seems to be getting along with his current large direct radiator solution too.
In my view, the La Grande Castine had a “manageable” mid bass and a very elegant alignment solution.


Whenever I feel blue, I start breathing again.
05-17-2019 Post does not mapped to Knowledge Tree
noviygera


Chicago, IL
Posts 158
Joined on 06-12-2009

Post #: 3
Post ID: 25426
Reply to: 25425
No in-between horn
When commenting on Musique-Concrete System, Romy wrote: "In a horn the most important category is the ratio between the mouth and throat" 

"the bass horn are dangers and it is better do not do it if they are not done properly."

Although, berried in the The European Triode Festival’s horns post: http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=1&postID=11682
i did find useful information to follow the evolution of one short midbass horn. 

So here is some information about the problems of short midbass horns with their fundamental flaws pointed out. It seems to be a choice to make proper long horn or if that is not possible, to use direct radiators, like a pair of 15". There is no "in-between horn".  (80-500hz)



05-18-2019 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,623
Joined on 05-28-2004

Post #: 4
Post ID: 25429
Reply to: 25424
It is all that counts...
Noviygera, yes to a degree a short midbass horns is not really a horn but some sort of waveguide or bounce-horn. A horn described, if to drop all crap out, by volume of LF equalization (boost) the horn makes. A larger trout to mouth ratio the larger LF gain, different profiles yield different LF gains and many other factors and it is not necessarily that the larger LF gain is better. I personally call an enclosure a horn if you have more than 6dB gain at mouth rate frequency. Do the acoustic enclosure that have less then 6dB gain and not qualified by my standards as “horn” have right to exist? If cause they are. It is not about the topology per se but HOW you use the topology. 
 
Now about my comment regarding the "bass horns are dangers and it is better do not do it if they are not done properly”. You understand that “dangers” is an allegory that describes a punitive aspect of improper implementation projected to amount of efforts. Do, turn wood, buy drivers, make the thing happen but if you do it wrongly then you have a result that is much easier to get out of direct radiators. Is it prohibitive direction to go it audio? It looks like we in high-end audio accustomed to justify any of our ordinary stupidity by our extraordinary desires...  
 
Sorry, for my typical philosophical soliloquy. So, what is wrong with short midbass horn? Try it, answer to yourself and then see if you can live with the answer projected to the very specific listening objectives you have. If you can make the sound you need with short horn or longhorns or whatever topology you use …  it all what counts….


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
05-18-2019 Post does not mapped to Knowledge Tree
noviygera


Chicago, IL
Posts 158
Joined on 06-12-2009

Post #: 5
Post ID: 25431
Reply to: 25429
Midbass channel
Romy,
I actually had one of those horns, as I wrote in the first post. Edgar 80hz straight horn. I sold it long ago because I did not like the sound, no matter what amps I tried it with. The problem was, to me it sounded muddy, no matter what I tried, that's all I remember. Actually, I don't remember anything positive from listening to it. Also, the box was very resonant. So I came back to this topic to figure out if the entire topology is doomed or if there are in fact good sounding short horns, designs that address the issue of muddy sound that I experienced.

I don't really understand what happens acoustically, as you say "chocking effect" so I have no particular list of deficiencies to address when it comes to this short horn topology and the only obvious one is to make the box/horn extremely rigid, but that is just one variable out of the rest of unknowns to me. Knowing those unknowns would be useful to engineer a sound design. But I do not intend to shoot in the dark, specially with something as complicated.

So my first intent is to rule out a ill-fated topology if it is such, by people who have experience with these topologies. It may be in fact a sonically extremely compromised design that was born out of marketing decisions. Or not. In that case I want to find out what makes for a sonically good short midbass horn with compromises that are reasonable. Bad sound is not one of them but others may be acceptable. For example, complexity of construction is acceptable (non parallels walls). Since I need to use it up to 80-300hz, that is relatively narrow bandwidth, also acceptable.

I saw this design and thought maybe it is sort of waveguide midbass approach. Something like this can be implemented with good sounding 12" drivers, like the Vitavox or maybe less exotic even.
https://www.renkus-heinz.com/st5l

Has anyone experimented with such type of enclosure? Does anyone see glaring problems with such an enclosure?
05-19-2019 Post does not mapped to Knowledge Tree
rowuk


Germany
Posts 274
Joined on 07-05-2012

Post #: 6
Post ID: 25433
Reply to: 25431
Actually insulting.
There is nothing waveguidy about this product. It is just a bunch of dead highest power drivers in a too small box with a high power DSP Amp to compensate.

If you want inspiration from PA, look up Tom Danleys company. At least he has working ears and a brilliant mind.


Whenever I feel blue, I start breathing again.
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