Just to help my understanding, wouldn't the size of the gap relative to the wavelength be relevant?
eg some of the lower frequencies might still be impacted if they had a quarter wavelength longer than the gap?
To control directivity to this new design limit, yes; for WLs below this point [original design limit] there will be mass quantities of reflections/diffractions to 'blur' it a bit [I use/recommend foam as a high SQ way to do similar on typical mids-up horns] and of course below this point the horn's in control.
This abruptness would create a fanned out dispersion with control to a lower frequency.
GM
I forgot to check before but just did. It was 49.20. I updated it to 50.50. Thanks again!
Hi tizman,
Thanks for the confirmation, that explains it
.Prior to Version 49.30 it was possible to set Eg = 0, which gave the driver diaphragm a constant rms velocity of 10 cm/sec at all frequencies. The functionality was changed in Version 49.30 to allow the user to specify a constant velocity value other than 10cm/sec, and a constant acceleration option was also added at the same time. It was no longer possible to set Eg = 0.
Kind regards,
David
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If I am able to control the directivity of the bass frequencies with an appropriately sized horn, wouldn’t it be possible to point the horn in the direction I want the bass to go? Most discussions relating to the improved performance of multiple subs over a single sub usually refer to bass reflex or sealed subwoofers. These are of course omnidirectional. Is a proper horn subwoofer directional rather than omnidirectional?
There's a house near me that looks like a small castle and once upon a time it had a mono 30 Hz expo horn that was a false wall built in with the compression driver/throat centrally located, then fanned out [high aspect ratio] to create a full height slit mouth in each corner.
When you're being flattened by a true 'wall of sound' you don't tend to notice minor room loading variances.
GM
When you're being flattened by a true 'wall of sound' you don't tend to notice minor room loading variances.
GM
In theory, yes, but in practice, you're just not going to build a horn big enough to achieve that result.
Plug a few sample numbers into the equation GM gave you to get a feel for the dimensions required. (The "mouth width" parameter in GM's version of the equation is in inches by the way.)
To wit, it's going to end up about the size of your house, not just your listening room
In theory, yes, but in practice, you're just not going to build a horn big enough to achieve that result.
Plug a few sample numbers into the equation GM gave you to get a feel for the dimensions required. (The "mouth width" parameter in GM's version of the equation is in inches by the way.)
To wit, it's going to end up about the size of your house, not just your listening room
The room I have has dimensions of 10 feet by 30 feet that are available for the horn mouth. I can use the entire long dimension for the horn mouth, but I am limited by the short dimension. 10 feet is half a wavelength of 57 HZ, and 30 feet is half a wavelength of 19 HZ. Assuming the horn mouth takes up the entire available area, what does the limitation of the the smaller dimension do to the 19 HZ capability of the larger dimension. This is all happening in a room, not in open space, but it would appear that the problems created in room with this huge horn would be shared by any other subwoofer as well.
tizman -
I'd like to know more about the location and setting of this project in the Toronto area.
Have you thought of engaging the talents of the local crew? We have jolly gatherings from time to time and I'm sure others would be delighted to help you. Me too, when I'm back in T.O. for motorcycle season.
Don't miss post #1322
Greater Toronto Area DIY meetup
B.
I'd like to know more about the location and setting of this project in the Toronto area.
Have you thought of engaging the talents of the local crew? We have jolly gatherings from time to time and I'm sure others would be delighted to help you. Me too, when I'm back in T.O. for motorcycle season.
Don't miss post #1322
Greater Toronto Area DIY meetup
B.
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Unfortunately, I am not allowed to share more at the moment. The project will have to be further underway before I can do so. When I can, I will give more details. I will most definitely engage the talents of the local crew when I can. Thanks to you all for sharing in this thread!
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