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Old 7th November 2003, 03:02 PM   #1
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Question Time delay without the $600+ expense??

Hi all
Just wanted to hear if anybody knows a (the?) way of delaying a signal about 30 cm, so my midtones can be in line with the tweeters... 30 cm = just under 1 ms according to my calculations...

Will 1 ms be audiable or...? any links will be appreciated...

Thanks, Anders
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Old 7th November 2003, 05:29 PM   #2
SY is offline SY  United States
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A digital delay line ought to cost a whole lot less that $600. Aren't the Behringer units about half that?

You could construct an analog delay line with a bunch of coils and caps, but that could run you a nice chunk of money. Why do you need so much delay? 1 ms is pretty hefty. If you're trying to match up two drivers with different zero delay planes, in most cases you can jimmy up the crossover to give a flat response as long as you account for the delay in your design.
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Old 7th November 2003, 05:45 PM   #3
tiroth is offline tiroth  United States
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With just the Ultracurve DEQ2496 you can supply a delayed and non-delayed signal and reap all the other benefits as freebies. Admittedly the AUX output has a poorer quality DAC.

As SY said, the cost is only US$300 here...
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Old 7th November 2003, 08:40 PM   #4
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Thanks for the replies

I'm using a active filter (jbl m553) to divide the signal output...
Caps and coils would be a nice way to delay the signal i think... In Denmark add about 75-100 percent of what electronics cost in the US. Here a jbl controller, or filter, costs about $800 new... (i bought mine used in the states for 300...)

The reason why i need it is because i built my horn on the same baffle as the midtone.... (I thought of time delay costs only after i designed the thing...) Caps and coils shouldn't cost that much?

(doing it 'low' budget/DIY is a concern for me as i otherwise lose pride in the project)

Anyways - A link to doing it 'manually' would be nice, or some clue as to where/how to start investigating it...

Thanks,
Anders of Denmark
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Old 8th November 2003, 02:25 PM   #5
haldor is offline haldor  United States
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Rane sells an analog line level crossover that includes variable delay. Luckily for all of us, rane posts full schematics to all of their products on their website.

http://www.rane.com/ac22b.html

Hope this gives you some ideas.

Phil
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Old 9th November 2003, 10:07 AM   #6
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Hi again...

i checked the link out and i must admit it was a bit hard to see what they have done with the delay...

What im hoping is that, since i dont need the delay to be variable, there would be some kind of formula for which caps and coils to use, in order to obtain a specific delay of 1 ms....

Thanks a bunch

Anders
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Old 14th November 2003, 07:12 AM   #7
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Hi -

I have a similar offset between the woofer closest to my horn and the HF horn, and since I cross over below 1Khz, it's easily taken care of with a third or fourth order LP filter.
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Old 15th November 2003, 03:19 AM   #8
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Quote:
Originally posted by thoriated
Hi -

I have a similar offset between the woofer closest to my horn and the HF horn, and since I cross over below 1Khz, it's easily taken care of with a third or fourth order LP filter.

Can you explain how you do that exactly, or put a link up? (I use an active filter JBL m553...)

thanks
Anders
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