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Time alinment confusion (hd 15)
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PBanyer View Drop Down
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    Posted: 01 January 2005 at 8:31pm

Time alinment confusion

 

1 Hd 15 on the floor. The midrange is about 1.8 meters off of the floor which is twin 12s in a box  (not a horn) then I use a horn for the highs that sits back 20cm in relation to the mid range.

Could some one please tell in cm how much I need to delay the mid and highs to be able to time a line them all. I have a dig x over and can just put the figures in.

I wish you all happy New Year.

Thanks for any help

Phil
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tb_mike View Drop Down
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Its all about simply converting Distance into time.

http://www.speakerplans.com/page88.html
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miniphil View Drop Down
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Points: 71 		Post Options Post Options   Thanks (0) Thanks(0)   Quote miniphil Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2005 at 11:13am

If you can get a tone generator, then put a tone through the system at each croossover frequency. Adjust the the dealys until you get the loudest sound. Poor man's way of doing it. ideally, borrow a friend with Smaart.

I think I use about 5ms with my HD15s, but it is stored in the Driverack, so I have forgotten now.
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Points: 8800 		Post Options Post Options   Thanks (0) Thanks(0)   Quote norty303 Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2005 at 1:43pm

Quote Adjust the the dealys until you get the loudest sound.

Or reverse the phase on the HD15 then adjust the delay until you get the least sound (cancellation) then flip the phase back.  I'd say this is easier to detect with the ear.
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Dom View Drop Down
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Points: 1700 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Dom Quote  Post ReplyReply Direct Link To This Post Posted: 05 January 2005 at 7:30pm

WinISD works fine as a tone generator, and inverting the phase on one of the cabs is the easiest way to do it...   If you haven't got a laptop you can always just burn a CD with test tones recorded at your crossover points...

Personally I think it's the quickest and easiest way to do it..  Just have a rough guess at the distances and adjust the delays by ear.  Much quicker than setting up a SMAART rig everytime...
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Points: 7 		Post Options Post Options   Thanks (0) Thanks(0)   Quote kramG Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2005 at 4:04pm

I think you can download a trial version of smarrt which will run on any basic PC with a stereo input soundcard using the impluse measurement tool you will be able to see the arival times of the different componants and calulate the diference but you knew that anyway

Kram G
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hiphei View Drop Down
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Points: 76 		Post Options Post Options   Thanks (0) Thanks(0)   Quote hiphei Quote  Post ReplyReply Direct Link To This Post Posted: 08 January 2005 at 11:11pm
PBanyer, sorry for using your thread, but i didn't want to make new one for very similar questions..

What would be the correct height to measure delays..?

My speaker stacks are at least 1.8m tall (Bass horns, mid  horns and top horns. I haven't really measured the height).

I have thought it a lot, and i just can't figure out the correct way to measure it properly. (Wouldn't it make odd response at crossover point, if spreakers aren't precisely time aligned?)

I already downloaded trial version of SMAART, and it looks very good software! But, no matter how hard i think, there always seems to be different delay between cabinets depending on position of measurement microphone.

How on earth do you guys measure it..?


Edited by hiphei
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tb_mike View Drop Down
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Quote What would be the correct height to measure delays..?

head height perhaps?

its all about the distance,your trying to cause all loudspeaker cones to be aligned vertically in time.

 

http://www.prosoundweb.com/install/synaudcon/

http://www.prosoundweb.com/sr/tech_corner/

 



Edited by tb_mike
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