Search found 473 matches

by UliBru
18 Aug 2022 15:20
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 32
Views: 3247

Re: Time alignment of drivers in active multiway speaker systems

Simply convolve the XO with the reversed allpass.
Then apply CutNWindow with length 65536 and start position 65536. Un-check the options.
Save the result as XO
by UliBru
17 Aug 2022 18:04
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 32
Views: 3247

Re: Time alignment of drivers in active multiway speaker systems

Arthur,

1. reverse the allpass
2. rotate the woofer pulse back by +6000
3. convolve pulse + reversed allpass
4. CutNWindow the result to length 65536 with start position 65536
5. rotate the result by -6000 to see the allpass treatment in the phase chart
by UliBru
15 Aug 2022 14:08
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 32
Views: 3247

Re: Time alignment of drivers in active multiway speaker systems

Indeed you are allowed to ask this ;) From a practical point of view for more than a century people have listened to speakers with insufficient timing aspects and despite this they have claimed to hear a perfect system. Anyway you will never miss something that you haven never known or heard about b...
by UliBru
15 Aug 2022 09:14
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 32
Views: 3247

Re: Time alignment of drivers in active multiway speaker systems

I do not believe in automatic time alignment. I have seen too many misalignments and I see many chances for suboptimal alignments. Maybe one day there is an AI method to do this but therefore the AI system has also to learn a lot first. So read e.g. the first contribution in this thread and check if...
by UliBru
13 Aug 2022 18:16
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 32
Views: 3247

Re: Time alignment of drivers in active multiway speaker systems

A multiway system is characterized of using at least two ways per channel. So yes, basically the alignment principles are also valid for mains + sub. At least when they are driven with their own XOs. Keep in mind that you have also to measure with the according XOs in place during the measurement.
by UliBru
03 Aug 2022 09:39
Forum: Acourate
Topic: Development of open baffle 3-way plus subs
Replies: 46
Views: 12120

Re: Development of open baffle 3-way plus subs

The allpass is time reversed but not inverted. The uptilting phase curve is caused by a numerical problem. The allpass has the length of 65536 samples counted from 0 to 65535. The max peak is at position 0. After reversion it is at position 65535. For a correct phase display it should be at position...
by UliBru
02 Aug 2022 09:04
Forum: Acourate
Topic: Development of open baffle 3-way plus subs
Replies: 46
Views: 12120

Re: Development of open baffle 3-way plus subs

Horacio, you use the pulse response to evaluate the required allpass. Therefore you rotate the pulse by -6000 (6000 = peak position) and design the allpass. To see the effect of the allpass you rotate the pulse back by 6000 samples (or load the original pulse), reverse the allpass and convolve both....
by UliBru
31 Jul 2022 15:21
Forum: Acourate
Topic: Development of open baffle 3-way plus subs
Replies: 46
Views: 12120

Re: Development of open baffle 3-way plus subs

See menu Edit - Settings to switch from phase display with radian angle +-Pi to angle in degree +-180°
by UliBru
31 Jul 2022 09:59
Forum: Acourate
Topic: Development of open baffle 3-way plus subs
Replies: 46
Views: 12120

Re: Development of open baffle 3-way plus subs

Horacio,

maybe you have missed to rotate first the pulse by -6000 samples. The exact value is the position of the pulse peak. It should be at 0 after rotation
by UliBru
26 Jul 2022 12:37
Forum: Acourate
Topic: Filter Generation One Way XOver Detection
Replies: 4
Views: 189

Re: Filter Generation One Way XOver Detection

Check if the XO files have a filename like XO1L48mp.dbl. Then rename them to XO1L48.dbl