sub series / parallel Qts parameter - diyAudio
 sub series / parallel Qts parameter
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 30th April 2004, 09:08 PM #1 diyAudio Member RIP   Join Date: Nov 2003 Location: Brighton UK sub series / parallel Qts parameter Given a dual voice driver has fixed Vas and Fs parameters, I assume there is a simple relationship between Qts for series and parallel connection but I don't know what is is. Assuming Qms is high so Qts ~ = Qe whats the relationship ? sreten.
 1st May 2004, 12:22 AM #2 diyAudio Member     Join Date: Feb 2004 Location: Stockholm I think the key is in BL and Re. B is always constant. Qes=w0*Mms/((BL)^2/Re)=w0*Mms * Re/(BL)^2 Compared to single coil: Series connection: L is doubled, so BL is doubled. Re is doubled. So Qes is halved Parallel connection: L and BL is the same*. Re is halved So Qes is halved This should mean that both Qes and Qts are the same for the dual coil driver regardless of series or parallel connection. This also makes sense in that 4 and 8 ohm versions of drivers usually have the same Qts, even though the number of windings has been changed. *See the two windings as running close to each other in parallel. This would mean that the voltage at any given point along the wire would be the same in both wires. So we can join them together in one thicker wire without changing the behaviour. Alternatively the length can be seen as doubled and the current as halved. A halved current is equivalent to a halved B, so BL is the same. This is just taken from the back of my head at 01:20 at night, so I might have got it wrong. I have a faint memory of that I saw this explained on some site describing the Shiva driver, that could be good to look up too. __________________ Simulate loudspeakers: Basta! Simulate the baffle step: The Edge
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Join Date: Jun 2002
Location: USA, MN
Imagine how Re and BL change.
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 1st May 2004, 06:46 AM #4 diyAudio Member     Join Date: Sep 2001 Location: Sydney le'me know what you think of this one __________________ Crossover/Subwoofer Simulator
 1st May 2004, 09:41 AM #5 diyAudio Member     Join Date: Feb 2004 Location: Stockholm f4ier: Hmm. If Qes is the same in the two configs, at Qms also is, mustn't Qts be the same too? (two first images) __________________ Simulate loudspeakers: Basta! Simulate the baffle step: The Edge
 1st May 2004, 02:14 PM #6 diyAudio Member     Join Date: Jun 2002 Location: USA, MN Isaac, I think in the configuration with one amplifier connected to each coil, with separate signals, you need to use the same parameters as when one coil is shorted (with a resistor equal to the output impedance of the amp). If both channels play the exact same signal, it would be the same as parallel connected case driven by one amplifier, but the impedance to each amp is double... __________________ Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works. --Carl Sagan Armaments, universal debt, and planned obsolescence--those are the three pillars of Western prosperity. —Aldous Huxley
 3rd May 2004, 12:50 PM #7 diyAudio Member     Join Date: Sep 2001 Location: Sydney Svante, yep, Qts for both configurations is the same, I included the equation for Qts in the first set of parameters just for convenience (so that the reader doesn't have to scan the text to find the Qts equation). Ron, section 1f is consistent with your point, but I failed to make it just as specific. I'll clarify 1f and its corresponding column in the table as soon as possible, that page needs to be updated anyway. Thanks for point that out. __________________ Crossover/Subwoofer Simulator

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