Subwoofer alignement

[gregory79]

hello folks,

I'm using rew for e couple of weeks now and last week I bought a mini dsp 2x4 hd. But I'm having problems with the alignement tool in rew. I measure the 2 subs individually and then use the alignement tool. Now I play with the sliders of the second sub until I have the most positive summation and click on "aligned sum" But when I enter the delay in ms in the mini dsp and take a new measurement, I hoped it would be the same as the aligned sum but it isn't. Any ideas ? I watched a few videos on YouTube but didn't get any wiser. Probably dot ng something wrong but I don't know what.

 

[John Mulcahy]

You need to measure the subs with a timing reference and the reference needs to be the same for both subs.

 

[sm52]

I hoped it would be the same as the aligned sum but it isn't.

Whoever does this is hiding in your room. These are reflections. Reflections change if the conditions for their creation change. Do the work you've done a few times and choose the best option.

 

[gregory79]

You need to measure the subs with a timing reference and the reference needs to be the same for both subs.

I think I don't understand that :/

 

[gregory79]

Whoever does this is hiding in your room. These are reflections. Reflections change if the conditions for their creation change. Do the work you've done a few times and choose the best option.

what do you mean its the conditions change ? everything in the room stays at the same place or stays open or closed :/

 

[John Mulcahy]

Measuring with a timing reference

 

[JStewart]

@gregory79 it is correct that, assuming the mic has not changed position (even a very small amount) and the measurements were done of each subwoofer only & separately, and the measurements were done with a timing reference (in your case the center is ideal), then after using the alignment tool and measuring the subs (only) together, the measurement will match the alignment tool calculation.

A couple of things before measuring:
1. Any sound enhancement DSP functions in the AVR must be off.
2. Assuming you are using a usb mic and therefore acoustic timing reference, set the timing reference channel (center recommended) to full range. (small point here, but why not)

What channel are you sending the measurement stimulus to? LFE or one of the fronts? If one of the fronts, set the xo to highest value possible and disconnect the actual front speaker when measuring, being careful not to allow the speaker wires to short, of course.

 

[gregory79]

@gregory79 it is correct that, assuming the mic has not changed position (even a very small amount) and the measurements were done of each subwoofer only & separately, and the measurements were done with a timing reference (in your case the center is ideal), then after using the alignment tool and measuring the subs (only) together, the measurement will match the alignment tool calculation.

A couple of things before measuring:
1. Any sound enhancement DSP functions in the AVR must be off.
2. Assuming you are using a usb mic and therefore acoustic timing reference, set the timing reference channel (center recommended) to full range. (small point here, but why not)

What channel are you sending the measurement stimulus to? LFE or one of the fronts? If one of the fronts, set the xo to highest value possible and disconnect the actual front speaker when measuring, being careful not to allow the speaker wires to short, of course.

dsp functions are off in the avr. Xo is set at 250. and everything is send to the Left front channel. and I measure with the UMIK 1. But I've never heard of timing reference so I have to read @John Mulcahy link first

but thx

 

[ddude003]

I think the word for today is "Time Alignment"...