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Multi-Way Conventional loudspeakers with crossovers

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Old 10th April 2019, 08:17 AM   #791
jzagaja is offline jzagaja  Poland
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ARTA
You can turn off p48 in TotalMix only?
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Old 10th April 2019, 09:25 AM   #792
tmuikku is offline tmuikku  Finland
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The older babyface manual says
"
48V Phantom power on/off
Use Select key and select “In”
Push the Encoder to select the desired channel (left, right, both)
Push and hold the encoder until the orange 48V LED(s) turn on/off.
"
It might be the same with the newer babyface pro as well
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Old 10th April 2019, 10:51 AM   #793
jzagaja is offline jzagaja  Poland
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Maybe someone could share measurement box schematic with p48 present?
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Old 18th April 2019, 03:01 PM   #794
ente is offline ente  Germany
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Default ARTA 1.9.2

ARTA 1.9.2 is available since wednesday: ARTA Download
Also some updated papers: http://www.artalabs.hr/AppNotes/AP1_...-2-Rev1Eng.pdf

Regards
Heinrich
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Old 20th April 2019, 05:50 PM   #795
rich08 is offline rich08  Slovakia
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Quote:
Originally Posted by ente View Post
ARTA 1.9.2 is available since wednesday: ARTA Download
Also some updated papers: http://www.artalabs.hr/AppNotes/AP1_...-2-Rev1Eng.pdf

Regards
Heinrich
Thank you very much Mrs. Some english translation Limp tutorial 2.5 ?
Some question, 0.1 or 0.2 volts is the terminal voltage?
Thank you.
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Old 21st April 2019, 06:56 AM   #796
ente is offline ente  Germany
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Hi Rich08,

yes it's the terminal voltage (original manual, fig 3.1 or 3.2, left in).

The following pic shows max THD (as defined in original Manual on page 25 "a) Procedure in Stepped sine mode") as function of terminal voltage for 3 different drivers.

Regards
Heinrich
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File Type: jpg MaxTHD during imp measurement.jpg (51.7 KB, 201 views)
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Old 22nd April 2019, 09:54 AM   #797
mbrennwa is offline mbrennwa  Switzerland
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Quote:
Originally Posted by ente View Post
The following pic shows max THD ... as function of terminal voltage for 3 different drivers.
Are you sure this is THD? The high values at low drive voltages make me think this might be THD+N. Or is this maybe some mechanical stiction in the drivers that cause higher distortion ratios at low drive voltage?
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Old 22nd April 2019, 09:39 PM   #798
iMat is offline iMat  Croatia
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Originally Posted by mbrennwa View Post
Are you sure this is THD? The high values at low drive voltages make me think this might be THD+N. Or is this maybe some mechanical stiction in the drivers that cause higher distortion ratios at low drive voltage?

The measurement shows THD, but when signal is low the noise contributes to THD value. Some other effects probably arises like hysteresis of suspension and...

Heinrich has made nice measurements to show that we can find the excitation level that will gives as "small signal regime", which is optimal for measurement of impedance and TSP estimation.
Small signal regime is important because in estimation of TSP we are using assumption of constant BL or constant compliance.

How to find optimal value of voltage is a problem as voltage is not the same on resonance and in pass-band (except when referent resistor is much smaller than Re)
We must use two step process with stepped sine excitation. In first measurement we find frequency with maximum THD and than try with larger or smaller voltage to get minimum THD.

What frequency region is important? Generally it is on frequencies at or bellow resonance, as in that range membrane has large displacement and compliance additionally exhibits creep effect (change of compliance with frequency).

Ivo
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Old 25th April 2019, 08:01 PM   #799
Denri is offline Denri  Russian Federation
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I'm sorry for noob question but I still not able to understand clearly how to set proeprly Gating window in ARTA in measured impulse reponse.
I try to measure 10" speaker with install height 950mm and on same height mic with a distance between them 1m. Vituixcad says that splitting frequency to connect with nearfiled measurement is about 3xx Hz and windows time until first reflection is ~3.3ms


But on every video\articles I see only one impulse while I see two of them. How so set start\stop gating window properly?
I use dual channel mode measurements. Pic of measurements is below

Click the image to open in full size.
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Old 26th April 2019, 07:21 AM   #800
rich08 is offline rich08  Slovakia
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Quote:
Originally Posted by ente View Post
Hi Rich08,

yes it's the terminal voltage (original manual, fig 3.1 or 3.2, left in).

The following pic shows max THD (as defined in original Manual on page 25 "a) Procedure in Stepped sine mode") as function of terminal voltage for 3 different drivers.

Regards
Heinrich
Thank you for answer. With resistor value of nominal loudspeaker impedance?
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