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In the Forum: Horn-Loaded Speakers
In the Thread: Midbass Horns and Real Estate.
Post Subject: The all is not so simple.Posted by Romy the Cat on: 3/3/2010
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 jessie.dazzle wrote:
Assuming you go ahead with the mid-bass horn project: If you decide to run the woofer towers along with the mid-bass horns, it is logical to assume they'll produce much of the range produced by these new horns.

I do not know how accurate it will be. I will need to look what my midbass horn will do and then to learn how much I need to compliment them with lower end. There is a remote possibility that my current bass arrays will be less effective if I use them at sub 40Hz and perhaps with sharper filter. It all depends how much bass my room would need. If it would need 300W-500W of power then I see no reason to drive my very fine and fancy array and might got for 4 Aura 1801 drivers that I have in my storage. Again, my arrays are refined tool not the high-power brutal force tool. They do a phenomenal bass (the guy from “Enjoy the Music” was not kidding – the bass is exceptional) but it is ONLY in context of my relatively small room where amp is in A1 and exertions is very moderate.

 jessie.dazzle wrote:
What would be your motivation for running two sources of mid-bass?

I do not know if I will. I would need to know what my mid-bass do. Do not forget that I have a LOT of mid-upper-bass tool in disposal. I have 6dB extra in my current upper-bass horn and I have high-pas my injection channel at 120Hz. I might let it all to go….

 jessie.dazzle wrote:
Do you anticipate having to use the woofer towers to augment the output of the mid-bass horns in order to properly load the room?

Yes, sure, the crossover point and the low-pass slope of woofer will be in respect with what mid-bass horns would do. at this point it is absolutely imposable to speculate on it.

 jessie.dazzle wrote:
Would the towers be a means of bringing perceived origin of mid-bass around to the space in front of the listener?

Good question. I sincerely hope that it will be the job of upper-bass channel and the Injection Channels. Ideally I feel that if I use 40 Hz-150Hz midbass horns then I would raise the crossover on upper-bass channel to let say 200Hz. It would be great for upper-bass quality BUT it might be no enough to maintain the since of defectively from midbass as the ahs will be behind. I hope (juts hope) that because I am planning do not let the mid-bass to shot directly to the listening position then the true location of the midbass horns will be mercy and not too visible. Anyhow, I will be dropping the crossover of the upper-bass to set the bass’s source properly. I hope I will not need to go to low to do it. Surely, it all will be observable only practically on the field.

 jessie.dazzle wrote:
If this is about room loading, with lower-bass enclosures in the picture you might feel differently. Since you've alluded to the possibility of pursuing the lowest octave, and since you're buying the perfect lower-bass enclosure/back chamber (just mount some 18-inchers in boxes open via the floor to the basement... Yes, a sealed basement), its too easy; you have no choice. However, using civilized crossovers, some mid-bass reinforcement of the 18" variety will be inevitable; this, in my experience has not been a bad thing:

I do not know. I see no problem if a time-aligned bass channel with first order and long tail runts into midbass. I still would like however do not do it if I have a change do not do it.

 jessie.dazzle wrote:
With mid-bass horns still not in use, the obvious weak zone in my system is centered on the 80-160Hz octave (see note at end). This void does not seem so pronounced as to require more than the work of a single pair of horns. The lower-bass enclosures are cut off on the high end at 60Hz, 6dB/octave, and though only very lightly solicited, listening without them does leave the kind of void I would not expect to fill using a single pair of horns.

Why don’t you raise the crossover point on your midbass-horn letting it to take over more in upper-bass region? Are your midbass and upper-bass channels in phase acoustically? Can you post in your thread the separate sweeps at the same volume level of 1) upper-bass 2) midbass 3) combined midbass and upper-bass in phase. 3) combined midbass and upper-bass out of phase.

Romy The caT

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