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Old 29th June 2008, 10:29 PM   #101
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Quote:
Originally posted by pikkuj??


If you are talking about the ribbon mltl's in question.The crossover point is 3000hz,so the Jordan does the work from about 35hz to 3000hz ,I wouldn't say it's used for mid bass!?

Yes I was talking about ribbon MLTL.
I'm by no means an expert for DIY speakers, so I'm just curious what will be the benefit of using Jordan and crossovering it at 3kHz, not something like 8kHz.
So are there very few woofers that can be crossed at 3kHz?

Thanks for kind info.

Doug
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Old 29th June 2008, 10:45 PM   #102
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Quote:
Originally posted by Doug Kim



Yes I was talking about ribbon MLTL.
I'm by no means an expert for DIY speakers, so I'm just curious what will be the benefit of using Jordan and crossovering it at 3kHz, not something like 8kHz.
So are there very few woofers that can be crossed at 3kHz?

Thanks for kind info.

Doug
Hi Jim Griffin has explained it well in his second post (post #6).
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Old 4th August 2008, 01:55 PM   #103
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Hi,

I have added AC G2si ribbons to my 31' MLTL (using Mr Griffin Crossover design) but the tweeters sound disproportionately louder than the Jodans.

I am using brand new decent quality caps (ClarityCaps PX) and, provisionally, very cheap wirewound resistors.

I wonder if the problem could be that the caps need to burn-in or the fact that I'm using cheap resistors with slightly different values- 8.2 and 3.3 Ohms instead of 8 and 3 Ohms?

I do not have measuring equipment so I cannot check actual numbers.

Any help on what could be the problem would be appreciated.

Regards

Antonio
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Old 4th August 2008, 03:17 PM   #104
DaveM is offline DaveM  United States
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If they seem too bright, try increasing the value of the series resistor. That will drop the tweeter level 1 db per ohm.
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Old 4th August 2008, 03:33 PM   #105
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Quote:
Originally posted by DaveM
If they seem too bright, try increasing the value of the series resistor. That will drop the tweeter level 1 db per ohm.
Dave M,

Thanks I will try that. However, the Jim Griffin's crossover design, which is the one I'm using, is supposed to include BSC already with a 3-4 db drop, so that's why I thought there was something wrong with my crossover in particular.

Actually, the tweeter is so loud that it almost seem as if it was playing alone without the jordan, so I do not know if 1db would make a difference.


Regards

Antonio
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Old 4th August 2008, 03:33 PM   #106
Nardis is offline Nardis  United Kingdom
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Hi Antonio

If you can get someone with a Behringer Digital Xover to visit, you can quickly see if the tweeters are at too high a level. You can use an On line L-Pad calculator like the one at
http://www.lalena.com/Audio/Calculator/LPad/
to work out values provided you remember that Jim Griffin has included BSC in his original design. I’m sure that Jim will have advice on this.

In my experience the quality of resistors is very important. I switched to from cheap wire-wound to Mills 1% fimported rom Parts Express, and it made a big difference to the sweetness of the sound.
These cost USD3.50 each and are a little cheaper (3.25) if you buy ten. The minimum order value for international shipping is USD50. If you are going to order some please contact me privately as I may want some things myself.
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Old 4th August 2008, 03:51 PM   #107
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Thanks Nardis,

You are right, I will try to have the speakers measured to really know what's going on.

I'll send you a PM.

Regards

Antonio
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Old 4th August 2008, 04:13 PM   #108
GM is offline GM  United States
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Quote:
Originally posted by A Sanchez

I wonder if the problem could be that the caps need to burn-in or the fact that I'm using cheap resistors with slightly different values- 8.2 and 3.3 Ohms instead of 8 and 3 Ohms?

Actually, the tweeter is so loud that it almost seem as if it was playing alone without the jordan...........
Not really.

Hmm, does the Jordan play fine without the ribbon and BSC connected? Clearly, something major isn't right, like a wire connection, wired wrong, amp unable to drive the Jordan's low impedance, etc..

GM
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Old 4th August 2008, 04:37 PM   #109
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Thanks GM,

Yes, the Jordan was playing fine without the ribbon and crossover. And it was also playing fine as a full range with BSC.

I really think you are right. I beleive there is a problem with the crossover construction. This morning I only had time to try it but this evening I will carefully check all the wiring.

Regards

Antonio
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Old 5th August 2008, 05:57 PM   #110
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Quote:
Originally posted by GM


Not really.

Hmm, does the Jordan play fine without the ribbon and BSC connected? Clearly, something major isn't right, like a wire connection, wired wrong, amp unable to drive the Jordan's low impedance, etc..

GM
Problem solved: wrong connection in the tweeter network and as a result I believe there was no cut off for the tweeter. I'm lucky I did not blow it.

Thanks again.
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