dual voice coil impedance switching

raintalk · 3rd November 2005, 06:43 PM

Say that you had a dual voice coil driver and you wanted to provide an impedance switch to get 4 or 8 ohms.

What are the effects of:
Shorting out one coil?
Opening up one coil?

Seems that shorting out would cause some kind of magnetic feedback to the other coil.

what about mechanical or electrical specs?

raintalk · 3rd November 2005, 06:44 PM

oops - one diagram missing - dual 4 ohm with dual pole switch to leave an open coil. You get the idea.

simon5 · 3rd November 2005, 09:32 PM

Shorting or opening up the coil will change the Qts. You could use a potentiometer to play with Qts.

megajocke · 4th November 2005, 11:08 AM

Leaving one coil unconnected causes Qes to double. Shorting one coil will give you the same Q as series or parallell, it's just that sensitivity will be lower. (The shorted coil will give the same damping as when driven by a voltage source).

If you want to make a subwoofer with an impedance switch or something like that you should use a double pole changeover switch so you can choose between series and parallell.

raintalk · 4th November 2005, 10:24 PM

Thanks.

I wondering if it's possible to do 4 or 8ohms with a switch.
Doesn't look like it. Or I can, but it's not optimal.

raintalk · 7th November 2005, 07:05 PM

How do these darn switches work?
http://www.kustom.com/products/pa/sw..._impedance.asp
http://news.harmony-central.com/News...ccuSwitch.html

Both say 4 or 8 ohms?

Not 4 or 16 ohms.

raintalk · 7th November 2005, 07:11 PM

Well 8 and 16 for the Kustom
Not 8 and 32 like I'd expect.

3rd November 2005, 09:32 PM	#3
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	Shorting or opening up the coil will change the Qts. You could use a potentiometer to play with Qts. __________________ DIYaudio for President !

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3rd November 2005, 06:44 PM	#2
raintalk diyAudio Member Join Date: Jul 2004 Location: Seattle USA	oops - one diagram missing - dual 4 ohm with dual pole switch to leave an open coil. You get the idea.

4th November 2005, 11:08 AM	#4
megajocke diyAudio Member Join Date: Jan 2003 Location: Solna	Leaving one coil unconnected causes Qes to double. Shorting one coil will give you the same Q as series or parallell, it's just that sensitivity will be lower. (The shorted coil will give the same damping as when driven by a voltage source). If you want to make a subwoofer with an impedance switch or something like that you should use a double pole changeover switch so you can choose between series and parallell.

4th November 2005, 10:24 PM	#5
raintalk diyAudio Member Join Date: Jul 2004 Location: Seattle USA	Thanks. I wondering if it's possible to do 4 or 8ohms with a switch. Doesn't look like it. Or I can, but it's not optimal.

7th November 2005, 07:05 PM	#6
raintalk diyAudio Member Join Date: Jul 2004 Location: Seattle USA	How do these darn switches work? http://www.kustom.com/products/pa/sw..._impedance.asp http://news.harmony-central.com/News...ccuSwitch.html Both say 4 or 8 ohms? Not 4 or 16 ohms.

7th November 2005, 07:11 PM	#7
raintalk diyAudio Member Join Date: Jul 2004 Location: Seattle USA	Well 8 and 16 for the Kustom Not 8 and 32 like I'd expect.

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