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Old 9th September 2013, 09:05 PM   #981
Coen is offline Coen  Netherlands
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Hello there,

I've been lurking around the forum for a while and just keep getting back to this thread. So i decided to try and make a pair of cornu speakers for myself. Anyhow, now i find myself lost in a sea of full range drivers and cornu spiral horn speaker sizes. I would greatly appriciate if someone could help me out with the following:

I wanted to start out with something small, so from reading the posts i gather:

2 inch driver = 36 cm
3 inch driver = ?
4 inch driver = 50 cm
5 inch driver = 75 cm

Can someone tell me the depths to go with these? Or is there a formula to calculate the speaker size (including depth) to go with the driver?

Ok so i was either thinking to go with something really small like 2 inch, or would it be better to go with 50cm for a living room speaker?

I'm from the netherlands myself and i'm finding it hard to get drivers for a decent price, parts express get expensive quite fast because of the shipping. Drivers i could get here are:

Visaton FRS 5x (2inch, the cheapest i found, would these be worth getting? i read some bad things about visaton)
FRS 5 X - 8 Ohm

Peerless 830986
Peerless 830986 3" Full Range Woofer 264-1056

The wavecor FR070WA01 (these are actually more expensive then i'd planned..)
FR070WA01_02

Or if anyone knows a driver of one of those brands that would be better suited i'm open for suggestions

Last question is about which drawings to use, i found the ones in post #30, are these still the ones to use? i also saw some "rounder" designs in other posts.

Thanks!
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Old 9th September 2013, 09:23 PM   #982
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Hi Coen,

I used a 4.5" driver (Fostex FF125WK) My box was 70 cm and the channel depth was 4.5" I used the first of the two drawings in post 30. I think we have agreed the more bends (elbows) there are, the better, as they filter out the mids from the horn.

As far as what size to use, that up to you, your environment and listening preferences. For myself, the 4.5" and the 3" are night and day apart.
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Old 9th September 2013, 09:39 PM   #983
Zigis is offline Zigis  Latvia
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Hi Coen,
of course, Part express is for North Americans, try SpectrumAudio:
Breitbandlautsprecher und mehr - SpectrumAudio

there was few more speaker sellers in Germany and I saw in Netherlands too, just google.
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Old 10th September 2013, 12:53 AM   #984
petervr is offline petervr  New Zealand
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Quote:
Originally Posted by Cal Weldon View Post
I used a 4.5" driver (Fostex FF125WK) My box was 70 cm and the channel depth was 4.5" I used the first of the two drawings in post 30. I think we have agreed the more bends (elbows) there are, the better, as they filter out the mids from the horn.

As far as what size to use, that up to you, your environment and listening preferences. For myself, the 4.5" and the 3" are night and day apart.
Hi Cal,

Rather than trawling through hundreds of posts, can I ask you what the 3" driver was?

I have a a 50cm one with the Vifa (as per xrk971) and really like them, but wouldn't mind at some future stage trying a 4.5" one like yours. Your current opinion on the 70 cm with the FF125WK is still the same as per some of your previous posts?

Peter V
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Old 10th September 2013, 01:42 AM   #985
xrk971 is online now xrk971  United States
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I think it was either an Aura NS3xxx or some salvaged white cone LG drivers from the thrift store?

But I would imagine the bass from a FF125wk is going to be superior with longer channels.
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Old 10th September 2013, 03:31 PM   #986
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I tried 6 different 3" drivers and it was a tie between a salvaged JVC and a salvaged LG. No comparison between the 3's and the 4.5. Go with the largest you can.

When it was placed outside recently, the bass made us all giggle like children.
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Old 11th September 2013, 06:47 AM   #987
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Quote:
Originally Posted by Cal Weldon View Post
...
When it was placed outside recently, the bass made us all giggle like children.
Whatever you were smoking out there, I want some.
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Old 11th September 2013, 09:02 AM   #988
Coen is offline Coen  Netherlands
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Quote:
Originally Posted by Zigis View Post
Hi Coen,
of course, Part express is for North Americans, try SpectrumAudio:
Breitbandlautsprecher und mehr - SpectrumAudio

there was few more speaker sellers in Germany and I saw in Netherlands too, just google.
Thanks for the site, i did google for german shops to but didn't find this one yet, i'll email them for the shipping costs.

Quote:
Originally Posted by Cal Weldon View Post
Hi Coen,

I used a 4.5" driver (Fostex FF125WK) My box was 70 cm and the channel depth was 4.5" I used the first of the two drawings in post 30. I think we have agreed the more bends (elbows) there are, the better, as they filter out the mids from the horn.

As far as what size to use, that up to you, your environment and listening preferences. For myself, the 4.5" and the 3" are night and day apart.
Well bigger might be better, but i guess my first pair will end up in my home office (2.5m x 3m) so 70x70 might be on the large side..

I did order some foamboard, might go for 50x50 or 40x40. What depth should i make those, 7cm for the 50 and 5cm for the 40 ?
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Old 11th September 2013, 10:42 AM   #989
xrk971 is online now xrk971  United States
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A rough way to estimate the depth of the Cornu is to set it so that the cross sectional area of the two throats leading from the driver chamber is equivalent to the Sd of the driver. However, you can be about 25% off and it will be fine. The deeper channel will allow more bass amplification and also more upper bass and mids to leak through, possibly necessitating use of more stuffing in the channels or even some light stuffing at the mouths. If you use a driver with a higher strength motor (high Bl and low Qts), you can make the throat on the smaller side to keep Vb down. Opposite is true of high Qts drivers. It is quite forgiving. If you have a driver you want to try get me the TS params and I can run a simulation for you.
X
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Old 12th September 2013, 03:18 PM   #990
Coen is offline Coen  Netherlands
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Quote:
Originally Posted by xrk971 View Post
A rough way to estimate the depth of the Cornu is to set it so that the cross sectional area of the two throats leading from the driver chamber is equivalent to the Sd of the driver. However, you can be about 25% off and it will be fine. The deeper channel will allow more bass amplification and also more upper bass and mids to leak through, possibly necessitating use of more stuffing in the channels or even some light stuffing at the mouths. If you use a driver with a higher strength motor (high Bl and low Qts), you can make the throat on the smaller side to keep Vb down. Opposite is true of high Qts drivers. It is quite forgiving. If you have a driver you want to try get me the TS params and I can run a simulation for you.
X
I've decided to go with the Fountek FE85

Fountek FE85 3" Full Range Driver 296-717

I read Switters already made a set with these so perhaps i should send him a message
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