Search found 468 matches

by UliBru
24 Jul 2022 11:04
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 19
Views: 2879

Re: Time alignment of drivers in active multiway speaker systems

The pictures show acoustical measurements. And yes, the target is to get a better linearphase behaviour of both XO + driver. This will result in pre-ringing by principle. But this is not bad. Because the pre-ringing of different drivers will cancel out. And finally macro4 of Acourate has the task to...
by UliBru
24 Jul 2022 11:00
Forum: Acourate
Topic: Development of open baffle 3-way plus subs
Replies: 46
Views: 11696

Re: Development of open baffle 3-way plus subs

Hello Horacio, 1. please do not use a mixed display mode (pulse response and step response) to compare different drivers 2. the driver levels will differ also dependent on the logsweep frequency range and the normalisation checkbox in the recorder. So simply ignore the different levels in the magnit...
by UliBru
23 Jul 2022 15:51
Forum: Acourate
Topic: Time alignment of drivers in active multiway speaker systems
Replies: 19
Views: 2879

Re: Time alignment of drivers in active multiway speaker systems

Hello Mikhail, ad 1.) indeed I have previously thought too that a minphase driver linearization will also correct the phase. Because the correction of minphase is again minphase. But then with driver time alignment by sinewave convolution I had to learn that beginning from top corner frequencies the...
by UliBru
20 Jul 2022 09:27
Forum: Microphones
Topic: Low distortion measurement mic
Replies: 2
Views: 138

Re: Low distortion measurement mic

Please be aware that the "high" distortion level in the article has been caused by a very high input level to the mic in close-up measurement. Usually you do not measure your system like this. I would recommend to compare different mics by a logsweep measurement of a linearized speaker in 1m distanc...
by UliBru
18 Jul 2022 18:44
Forum: AcourateConvolver
Topic: Acourate Convolver supported drivers
Replies: 8
Views: 410

Re: Acourate Convolver supported drivers

I never had come across a problem to set ISO226 active. Possibly you use a Window theme which hides the down state of the button. You find an ini-file referring to your soundcard Asio driver in \Documents\AcourateConvolver. There is a line with content ISOActive=1 in the section [General] which show...
by UliBru
17 Jul 2022 13:17
Forum: Acourate
Topic: Step Response Double Peak
Replies: 7
Views: 196

Re: Step Response Double Peak

Depending on the window width in macro4 Acourate does not try to correct reflections outside the window (frequency dependent) as such a correction will worsen the result with change of listening position. So it makes sense to search for the reflection point. A good approach is to measure in nearfiel...
by UliBru
17 Jul 2022 13:09
Forum: Acourate
Topic: Dipole Bass Low Shelving EQ
Replies: 11
Views: 303

Re: Dipole Bass Low Shelving EQ

If a measurement shows a weak bass response you can use a lowshelf to digitally boost the low frequencies. It should be clear that the limit is given by the digital number limit = 0 dBFS (full scale). As we do not know how much of this range is already used by the music signal thus the typical solut...
by UliBru
17 Jul 2022 12:46
Forum: Acourate
Topic: Development of open baffle 3-way plus subs
Replies: 46
Views: 11696

Re: Development of open baffle 3-way plus subs

Horacio, after creation of linearphase crossovers you should load them and check for the ringing in pulse response and step response display. You should also add the XOs and check the result. So you will learn that the different ringings will sum up to zero. And that higher filter orders will create...
by UliBru
17 Jul 2022 12:39
Forum: Acourate
Topic: Using LogSweep Convolution for exploring SRC bandpass filter properties
Replies: 2
Views: 92

Re: Using LogSweep Convolution for exploring SRC bandpass filter properties

1. Acourate is not designed to test different SRC options. But you can use Acourate functions to get as much information as possible. And yes, your approach is logical. In addition you may also check for harmonic distortions. But anyway you have to do this by manual steps. 2. the Dirac pulses have t...
by UliBru
17 Jul 2022 12:18
Forum: Acourate
Topic: Step Response Double Peak
Replies: 7
Views: 196

Re: Step Response Double Peak

David,

a pulse timing of 0.7 m means e.g. a backwall 0.35m behind the mic. Thus the sound has to travel distance from mic to backwall and back = 0.7 m.
So please check if there is a more close reflection point, e.g. table, seat, armrest, neckrest. The reflection can also happen on the speaker side.