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msaudio wrote:

Putting The Mid Bass horns behind your head will not work. This thread was about Mid Bass Horns Project, do you thank you will be able to use any frequency above 80 cycles with rear fired horns that are behind your head? That is a Joke. It looks more like a low frequency horns thread. So you are building a set of horns that will have a range of 35Hz to 80Hz max if even 80 might be a big question mark, there will be some real bad phase problems, time alignment will make it so your forced to use digital crossovers and that is more of a joke. You would be better off with the way your system was to start with, an a few mods that are simple. I preach horns but i will be the first to say that over sized horns suck. You will spend a lot more then $1000.00 on a Attic horn fiasco and when it is compleat you will want to start over because of the disapointment. But this will work out just great because you will go to a large horns setup for bass, then in the future after you learn from your mistake you will be bad mouthing them to. But pride and you pocket book will take the hit.  Msaudio

Msaudio,

I hope you are today more sober then you usually are and will be able to comprehend what I say.  The horn will be not 35Hz to 80Hz max but most likely 50Hz to 200Hz. If you are willing to object anything then get familiar with the subject of the objection – it was written about it many times. Your comment about prospective problems with phase problems and time alignment are ridicules – the whole project meant to be time-aligned. I will spend tens time more than $1000.00 and I have no assurance that I will not face disappointment.  So, what? It will be not first time and I hope not the last time. What however I have is the pride and knowing the result I am accustomed I do very comfortable with the pride for what I do and what I am trying to accomplish. Sure, I would like to learn from the mistakes of others. I do learn and I do not mind to contribute to the composite consciousness of playback organization my own experience. This is what my site is about. I do honestly tell about my project and I do interest about criticism. Unfortunately your are trying to deliver a criticism at the level that I consider sub-acceptable for myself.  Your arguments are very weak not to say illogical or ignorant, at least it is that way how I perceive it.

jessie.dazzle wrote:

One simple way to get a feeling for how this might or might not work out would be to place your currnet mid bass arrays in the rear of the room and run them with a band pass filter from 50-200Hz.

Jessie,

unfortunately I do not think that it is possible. You see the exhaust of horns will be not toward to the listening position but way about it to the pitch of the cathedral ceiling. This is the whole key and the whole uniqueness of the project. The LF will be coming to the listening position but the more directional HF will be hitting the room and detracting in there. I anticipate that I will be able even to go away with very slow low filter on the midbass horns as there is no direct line of sight between the horn and the listening position. It is imposable in my view to predict how much reflected HF will hit the listening position. It is not to mention that the listening position will be hit very much delayed reflected HF, the HF that will be phase randomized. That randomized delayed HF will be much higher than Haas delay in relation to the main channels, so I think that those randomized delayed HF will be now even associated with main signal and will act as reverberation. I have no idea how to model it – it is very complex. My feeling is that to tune the midbass horn I will be with the low-pass filter – I will be driving it down until the horn will lose sensible directivity. My estimate that at 1000Hz I will lose at least 15dB-20dB from this midbass horn from listening position and if so then  200hz will not be a problem at all. Of course no one know how it turn out but the right way do not have the answers is do not try.

The idea I think is very elegant, I just hope that my carpenter and my framer will not give me bad news….

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