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Multi-Way Conventional loudspeakers with crossovers

Introduction to designing crossovers without measurement
Introduction to designing crossovers without measurement
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Old 1st March 2017, 12:08 PM   #511
yakelkun is offline yakelkun
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Join Date: Feb 2017
Quote:
I have seen a system that had amps in the woofer box, RCA plugs leading in, frequencies split by the electronics therein, wires leading out for the satellites. I think you're going to need to do some investigating. Is there power going to the woofer box? What are the inputs and outputs?
Only the x4 wire cable is visible:
Click the image to open in full size.

Resistance is 3.9 ohms.

The service Manual infos :
Quote:
Power (Subwoofer)
Power supply: 220-240 V ~50 Hz
Power consumption: 150 W
Standby power consumption : Normal standby : <3 W
Low standby : < 0.3 W
System: Bass Reflex System
Impedance: 4 ohm
Speaker drivers:165 mm(6 1/2”) woofer
Frequency response: 50 Hz - 200 Hz
Dimensions (WxHxD): 295 x 440 x 295 (mm)
Weight : 10 kg
P.21 the diagram board.
Click the image to open in full size.

P.59 it look like filter to me..
Click the image to open in full size.

P.60The board
Click the image to open in full size.
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Old 1st March 2017, 02:24 PM   #512
yakelkun is offline yakelkun
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Correction :
7829 (75w 8 ohms)
3831 (75w 8 ohms) <-- SAME x2 3831 (not 3531 as I told before)
3831 (75w 8 ohms) <-- SAME x2 3831
5829 (80w 4 ohms)
Subwoofer (4 ohms)

So Sorry !!

Last edited by yakelkun; 1st March 2017 at 02:36 PM.
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Old 1st March 2017, 08:29 PM   #513
AllenB is online now AllenB  Australia
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Quote:
Originally Posted by yakelkun View Post
P.59 it look like filter to me..
I'm not sure those capacitors are important at audio.

Your amps drive front/centre/surround, left/right. They would not seem to drive low/mid/high separately meaning they aren't involved in dividing the bands for the speaker drivers. Maybe the drivers can handle being run full range. Maybe there are passive crossover components on the board. Maybe you should treat them all as separate drivers and start your own design with them...
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Old 1st March 2017, 09:40 PM   #514
yakelkun is offline yakelkun
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I think you are right.
I plan to simplify the design using the surround the center and bass to start.

So I'll need this kind of filter :
Introduction to designing crossovers without measurement


right ?


If right I still lack the cut frequecy resistance value, as I learn the value vary a lot depending of frequency. I red about ARTA but I'm not sure of my skill and don't want to risk my PC soundcard
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Old 2nd March 2017, 05:07 AM   #515
yakelkun is offline yakelkun
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Of course in the schema the tweeter will be replaced with a surround driver and the accordingly cut frequency.
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Old 2nd March 2017, 03:02 PM   #516
yakelkun is offline yakelkun
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I found some french video who explained to noobs like me lots of things.
Though I discovered impedance of the driver varies a lot depending of the frequency.. So it's vital to get the HP impedance at cut frequency to calcul the filters..

Now I'm looking to use ARTA, to get the impedance curve (Hz/ohm) of each driver, as for now I now very very little of them: (source: at 17min40sec https://jipihorn.wordpress.com/2014/...cile-partie-1/)

The curve :
Introduction to designing crossovers without measurement



Then I should decide how many driver I'll use in my DIY boombox.
To start a project like this using only Subwoofer and x2 Large range might be the real solution... I'll see depending on ARTA results.



My problem is to build the system able to get this curve, it's summed in this diagram :
Click the image to open in full size.

But I'm very bad at electronics.. I started a wiring scheme :
Click the image to open in full size.

Your help would be really apreciated if you could help me to wire it correctly to avoid to burn my PC motherboard..



Sources : sorry in french but it's gold to me.
Mesure des paramètres THIELE et SMALL d'un HP : Fs, Re, Qms, Qes et Qts


https://jipihorn.wordpress.com/2014/...cile-partie-1/
https://jipihorn.wordpress.com/2014/...cile-partie-2/
https://jipihorn.wordpress.com/2014/...cile-partie-3/
https://jipihorn.wordpress.com/2014/...einte-choisir/
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Old 3rd March 2017, 06:33 AM   #517
AllenB is online now AllenB  Australia
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82k, no the impedance magnitude is inappropriate. That would be better for before an amplifier than a speaker. Check the specifications for your sound card. You might find that it can drive a speaker level impedance.
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Old 3rd March 2017, 12:36 PM   #518
yakelkun is offline yakelkun
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82k is for the voltage disvisor (not sure of the english word), to lower Amp outpout voltage form 20~30v to 1~1.5v to avoid melting the soundcard. (82/4.2=19)
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Old 3rd March 2017, 12:37 PM   #519
yakelkun is offline yakelkun
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Here is the wiring scheme

Click the image to open in full size.
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Old 3rd March 2017, 02:16 PM   #520
AndrewT is offline AndrewT  Scotland
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the 4k3 lower leg and 82k upper leg give a divide by 20.07 (-26.05dB) from amp out to line in.

If the amp gain were exactly equal to this ratio, then the line out>>aux in level would be the same as the line in and mic in level after the attenuator.
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regards Andrew T.
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