Rerurn to Romy the Cat's Site


In the Forum: Horn-Loaded Speakers
In the Thread: Good midbass is complicated, if not unobtainable.
Post Subject: Some words of warning.Posted by Romy the Cat on: 12/22/2015
fiogf49gjkf0d
 noviygera wrote:
You provided very good starting points on the driver selection and I am also corresponding with a gentleman that may help me with actual horn design. I have found a couple of drivers that seem to work based on your guidelines. They are pro sound 10" to 12" with Fs around 50-55hz. Is it the case that driver size should be no more than certain diameter to sound decent in 60 to 300hz range? Such as, 15" being too large I need to look at no more than 12"? It looks like current hifi drivers are out question and anything remotely suitable is going to be PA.
ps. Correction: I just noticed that Fostex 8" full range drivers meet those specs and have very low power handling (maybe too low).

Noviygera, If I was targeting 60Horn then I would be looking for something as you said: Fs around 50-55hz, with 10-12” driver and probably 7-8” throat. I do not know about Fostex 8", I never used them. To have a good 8” driver and load it into let say 5-7” would be wonderful.  I just do not know if Fostex 8", being a “full-range” will have stiff enough code to be used as a compression driver. That all need to be your experiments. Do not forget to use in vintage JBL drivers, some of them are very dood.
 
I would like you also clearly understand that doing what you planning to do you will be out of “save zone”. I do understand that 20” of additional height do give to you a wondeful opportunely to kill with one channel both upper bass and midbass regions. As I told you there are many problems with this approaches. I did name juts two and you did have good justifiable reasons to neglect it. There are more to it and I would like to share with you as it very much might bite you by your foot in future. My idea to split channels across mid and upper basses did not derive from thin air but it descended from dealing with reality and practicality of real installations.  The 80-120Hz regions is VERY problematic in the average rooms we use for listening. In my view it is virtual impossible to have more or less even response from a channel that runs 60-300Hz and that is size of 2-6 refrigerators. You might get a response with huge drops or peaks at each channels but you will be unbelievably lucky if you do. Most of the time it is MUCH more manageable if you have a channel split in the mid of the “dangers zone” when you can with crossovers, positioning and many other ways to make a right fit into the acoustics of your room. Also, I kind of recognize that the above 80s horns are speaker’s channels and they comply with esthetics of the rest of the horns. The sub 80s horns are rather room’s channels and they are not part of your playback but rather a part of the room décor. There are others censers that I would express. For instance do you really want 60Hz shooting at your face? I feel that any horns under 80hz should not s
 
Anyhow, I do it is a noble task to integrate everything into one 60-300Hz channels but you do need to understand that if you during do it will have some acoustic integration problems then by the venture of the size of your channels you won’t be able to do anything.

Rerurn to Romy the Cat's Site