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Old 16th October 2012, 11:33 PM   #1
lduarte1973 is offline lduarte1973  Portugal
Join Date: Feb 2009
Question how to time align drivers (with minidsp) ?

how do I time align drivers with minidsp or in general ?

Last edited by lduarte1973; 16th October 2012 at 11:35 PM.
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Old 16th October 2012, 11:51 PM   #2
sreten is offline sreten  United Kingdom
Join Date: Nov 2003
Location: Brighton UK

How long is a piece of string once you get into the details ?

Clearly simple time delay will align the drivers acoustic centres, after
that its not clear what are you talking about related to the acoustic
crossover functions employed, digital phase correction for complex
x/o functions causes more trouble than it fixes usually, YMMV.

rgds, sreten.
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Old 16th October 2012, 11:56 PM   #3
lduarte1973 is offline lduarte1973  Portugal
Join Date: Feb 2009
im just talking about acoustic centers , i thought there would be some software with test tones or similar to achieve this , i tryed to time align my tweeters and woofers and did not like the results . Seemed as i delayed the tweeter it caused the tweeter volume to go down , maybe this is too complicated to do in a 3 way plus sub

anyway after 20 years of listening to these speakers without time alignment i can live without it

Last edited by lduarte1973; 17th October 2012 at 12:01 AM.
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Old 17th October 2012, 02:34 AM   #4
minidsp is offline minidsp  Hong Kong
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@ lduarte,

John Reekie did a very comprehensive tutorial on how to time align drivers with a miniDSP.
It's located in the Press Reviews (along with some of his other great articles)

Product Reviews | miniDSP
In the "miniDSP 2x4 for 4way Open Baffle project", he gives a clear explanation but please take the time to read that whole article (part1&2) together to really understand the steps.

www.minidsp.com - Low cost & modular audio DSP kits for DIYers - Follow our tweets @ minidsp
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Old 23rd October 2012, 05:41 PM   #5
boris81 is offline boris81  United States
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Join Date: Oct 2009
Location: white plains, ny
It will be very hard to do such a thing by ear. With symmetric crossover slopes you can calculate the time-delay needed to account for the distance between the center of the coils for both drivers.
I would however strongly encourage using measuring equipment.

If you want to correct the direction of a mid-and-tweeter lobe take a series of measurements on the vertical axis. I will use -30,0,+30 degrees for this example but the more you get the better. Some measurements will show flat response at the crossover frequency and other will show a notch. Adding time-delay to the tweeter will rotate the lobe(flat FR) upwards. Assuming a symmetric slopes XO you can adjust the time-delay and remeasure until the 0 is flat and the -30 and +30 notches become symmetrical.
If the filter slopes are not symmetric the notches will not be symmetric but you can still reposition the lobe to your liking.

You may also use time-delay to adjust the phase of a crossover similarly to adjusting the slope of the crossover filter. This would be more useful in lower frequencies like between a mid and woofer. Ideally you want the phase of both drivers to track linearly through the crossover frequency. If they are misaligned the phase plot will not track smoothly and adjusting the time-delay affect that.
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