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Multi-Way Conventional loudspeakers with crossovers

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Old 21st January 2013, 09:27 AM   #811
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Think of it as multicells first, rather than multicells instead You're gonna have tractrix horns also, soon enough.
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Old 21st January 2013, 12:21 PM   #812
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I like your thinking.........
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Old 21st January 2013, 12:32 PM   #813
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Getting back to how Keith builds his multicells, earlier posts on the subject:

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"Because of the widening of the of the entrance it keeps all the 15 appertures the same area never thought about it before. they could be tapered if you prefer that would give the outside 6 cell slightly more area"

I guess he means widening at the external cells. I think its because his cells start from a flat plane rather than radiating out, as if from a central point.

What thinks you?
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Just thinking on the above, doesn't that mean the outside are a different length to the rest?
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Originally Posted by Pano View Post
Good questions. I certainly don't know.
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Ok he's come back with a bit more info - "yes the cells are slightly shorter on the outside banks but the throats make up the differance by being longer on the outside edges"

Does anyone out there speak 'multicellular' fluently? Pano, how are the start of the throats arranged in your horns? Cal maybe you can shed some light?

I doesn't seem 'right' to me
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I believe the cells on my horns are all the same length, but could not swear to it. I'll measure them and show you a photo of how they join together as soon as I can.
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Originally Posted by Cal Weldon View Post
Pictures are best. You can see the arrangement at the throat. All horns are the same length and form a radial curve at both the throat and the mouth. The waveguide takes the round exit from the driver and makes it rectangle to enter the horn.
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We are hoping that you will buy a set and tell us!
So his horns are different because he builds the small end to a flat surface not all horns the same length leading to a rounded sent of entrances - his way makes sense now. I dont know whether to ask for a change or not thou
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Last edited by JRKO; 21st January 2013 at 12:35 PM.
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Old 22nd January 2013, 07:04 PM   #814
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Spoke to the man himself and have decided to go with his design. He sends then things to the US, GB, Australia, Japan so they must be ok. His feed back is great
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Old 23rd January 2013, 06:46 PM   #815
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ok miniDSP has arrived. Sat useless in its box until I have something to use it for. Horns are on order and should be a week or 2 now.......

cant wait........

just need to sort preamp

Emkens will happily do 750hz and below until new 15's are ordered. 15FH500 http://www.faitalpro.com/products/LF...p?id=151060100 are looking good - esp as they are 50 cheaper, EACHthan the 510 ferrite version!! slightly higher Qes & Qts and lower BL but should be good in a 4cuft box tuned to 45hz gives a -3db fig of 47hz. Plenty low for me in my smaller room.

A bigger box is possible so any ideas welcome
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Old 23rd January 2013, 07:22 PM   #816
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So you bought the horns instead? Not going to build them?
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Old 23rd January 2013, 08:15 PM   #817
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At the moment I cant get myself to concentrate and lose my temper for less than 10 min which is not conducive to paper making.

I will however be coming back as soon as I'm stable to this Idea. Person, made to measure paper horns turn me on.........

for noe 180 8 cells will have to do

Maybe my paper set will be 15 or 18's!!!!!!
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Old 23rd January 2013, 08:26 PM   #818
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Quote:
Originally Posted by JRKO View Post
Emkens will happily do 750hz and below until new 15's are ordered. 15FH500 FaitalPRO | LF Loudspeakers | 15FH500 are looking good - esp as they are 50 cheaper, EACHthan the 510 ferrite version!! slightly higher Qes & Qts and lower BL but should be good in a 4cuft box tuned to 45hz gives a -3db fig of 47hz. Plenty low for me in my smaller room.

A bigger box is possible so any ideas welcome
With this driver (15FH500) in a small room, I'd go with a 4cuft to 5cuft (net Vb) box tuned to Fs. It will play lower than your 45Hz tuning and the sloped response will possibly be better adapted to your room response. At least that's how I tuned my TD15M's in my small room and I like it. This also keeps a certain ammount of room for high impedance drive such as SET amps, which should also benefit from the tuning at Fs for maximum power transfer.

IG
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Old 23rd January 2013, 08:33 PM   #819
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top tip therer IG, tnx

-3db at same place but gentler slope
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Last edited by JRKO; 23rd January 2013 at 08:36 PM.
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Old 23rd January 2013, 08:34 PM   #820
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The 15FH500 also looks like it has a fairly problem-free response both on and off-axis. One should keep the crossover below 1kHz to maintain good dispersion though - probably where you'll end-up with your large horns.

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