L18rnxp + Lcy Ribbon?

GOWA · 29th April 2007, 11:21 PM

Can I get some feedback on this design so far.
http://www.artimages.ca/pages/speak.htm

kyselym · 30th April 2007, 06:39 AM

this design uses old seas L18 H1142 that is not available today. You may be lucky and find some... I can sell you two old L18 but postage will be probably higher than speakers.
With new L18 H1224 this design don't have to work properly...
on the other hand: from measurement it seems to be H1224 as it has brake-ups higher in spectrum.

here is datasheet for old seas:
http://phoenix.inf.upol.cz/~kyselym/...42_L18RNXP.pdf
new H1224:
http://phoenix.inf.upol.cz/~kyselym/...heet/H1224.pdf
(on seas web is newer pdf but with same data...)

GOWA · 1st May 2007, 04:26 AM

Uh oh. So you are saying that the crossover is designed for the old L18RNX/P(H1142) but I have the new L18RNX/P(H1224)?
If that's the case, it's back to the drawing board for me.

What do you think of the concept of using these drivers in this configuration?
Thanks for your input.

kyselym · 1st May 2007, 11:46 AM

i don't know...paper says it is for H1142 but from measurements I see brakeups too high for H1142(around 7-8khz-typical for H1224) H1142 has brakeups lower around 5khz.

personaly I wouldn't build this design for different reasons i'm not able to explain in english..sorry

edit: if you realy want to build st. with L18 H1224 the best design is probably zaphs: http://www.zaphaudio.com/audio-speaker17.html

or if you insist on ribbon, friend has this http://diyfans.org/vase/dawsoo1-05m.jpg
with SEAS L21RNX/P and BOHLENDER-GRAEBENER RD50

Dave Bullet · 1st May 2007, 11:21 PM

I would not build this design. The breakup mode of the L18's has not been dealt with. you can see this in the frequency response with a sharp rise in the 5-8K range.

This would make the speaker sound bright / edgy. A redesign of the woofer section of the crossover would be needed with a couple of notch filters, or steeper woofer crossover to get rid of the breakup.

Also - what driver layout is proposed? Is it flat or slanted baffle? If you were to build these, you should build the same enclosure for which the crossover was designed around.

Cheers,
David.

GOWA · 2nd May 2007, 01:14 AM

I was hoping for something like the Odin. Flat baffel.

29th April 2007, 11:21 PM	#1
GOWA diyAudio Member Join Date: Jan 2007 Location: Ontario	L18rnxp + Lcy Ribbon? Can I get some feedback on this design so far. http://www.artimages.ca/pages/speak.htm __________________ Website

1st May 2007, 04:26 AM	#3
GOWA diyAudio Member Join Date: Jan 2007 Location: Ontario	Uh oh. So you are saying that the crossover is designed for the old L18RNX/P(H1142) but I have the new L18RNX/P(H1224)? If that's the case, it's back to the drawing board for me. What do you think of the concept of using these drivers in this configuration? Thanks for your input. __________________ Website

2nd May 2007, 01:14 AM	#6
GOWA diyAudio Member Join Date: Jan 2007 Location: Ontario	I was hoping for something like the Odin. Flat baffel. __________________ Website

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30th April 2007, 06:39 AM	#2
kyselym diyAudio Member Join Date: Apr 2006 Location: Kojetin	this design uses old seas L18 H1142 that is not available today. You may be lucky and find some... I can sell you two old L18 but postage will be probably higher than speakers. With new L18 H1224 this design don't have to work properly... on the other hand: from measurement it seems to be H1224 as it has brake-ups higher in spectrum. here is datasheet for old seas: http://phoenix.inf.upol.cz/~kyselym/...42_L18RNXP.pdf new H1224: http://phoenix.inf.upol.cz/~kyselym/...heet/H1224.pdf (on seas web is newer pdf but with same data...)

1st May 2007, 11:46 AM	#4
kyselym diyAudio Member Join Date: Apr 2006 Location: Kojetin	i don't know...paper says it is for H1142 but from measurements I see brakeups too high for H1142(around 7-8khz-typical for H1224) H1142 has brakeups lower around 5khz. personaly I wouldn't build this design for different reasons i'm not able to explain in english..sorry edit: if you realy want to build st. with L18 H1224 the best design is probably zaphs: http://www.zaphaudio.com/audio-speaker17.html or if you insist on ribbon, friend has this http://diyfans.org/vase/dawsoo1-05m.jpg with SEAS L21RNX/P and BOHLENDER-GRAEBENER RD50

1st May 2007, 11:21 PM	#5
Dave Bullet diyAudio Member Join Date: Jan 2002 Location: Wellington, New Zealand	I would not build this design. The breakup mode of the L18's has not been dealt with. you can see this in the frequency response with a sharp rise in the 5-8K range. This would make the speaker sound bright / edgy. A redesign of the woofer section of the crossover would be needed with a couple of notch filters, or steeper woofer crossover to get rid of the breakup. Also - what driver layout is proposed? Is it flat or slanted baffle? If you were to build these, you should build the same enclosure for which the crossover was designed around. Cheers, David.

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