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Series-Parallel Or Parallel-Series
Series-Parallel Or Parallel-Series
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Old 1st December 2009, 10:55 AM   #1
shaan is online now shaan  India
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Unhappy Series-Parallel Or Parallel-Series

Hello Friends!

My current project is a pair of full-range speakers. I have two 20watt SE class-A amps which will drive them. I searched for 15-20watt full-ranges in my area but found nothing. The only available ones are of 30watt, but, are 8"! My liking is in the range of 4"-6". There are 4" drivers available, are of 8ohm impedance, but have a mere 5watt maximum power handling. My amp is happiest with a 8ohm of load impedance. So I decided to connect 4 of the drivers to each amp in Series-Parallel configuration resulting in 8ohm total impedance.

My question is that which connection technique should I choose? Which Of the following would be better?

Left or right?

Click the image to open in full size.........OR........Click the image to open in full size.

I have listened to both, but did not hear any difference in sound quality. I would like to interconnect the drivers in both channels in physically identical ways, i.e. will use any one of the two configs for both channels.
So any information about any objective advantage/disadvantage of either configuration is very much appreciated.

Thanks


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Old 1st December 2009, 11:25 AM   #2
picowallspeaker is offline picowallspeaker  Italy
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With series connection of two speakers ,except the doubling of impedance and the output level (And a double efficiency)=,nothing changes .Paralleling two speakers ,it halves the impedance ,doubles sensitivity and output . With serial-parallel connection impedance remains the same , but you get 4 times output level ,which is +12dB,same rise of efficiency(+6dB-1W) ,and same change in sensitivity ,+6dB with 2,83 V.
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Old 1st December 2009, 02:02 PM   #3
shaan is online now shaan  India
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Quote:
Originally Posted by picowallspeaker View Post
With series connection of two speakers ,except the doubling of impedance and the output level (And a double efficiency)=,nothing changes .Paralleling two speakers ,it halves the impedance ,doubles sensitivity and output . With serial-parallel connection impedance remains the same , but you get 4 times output level ,which is +12dB,same rise of efficiency(+6dB-1W) ,and same change in sensitivity ,+6dB with 2,83 V.
Thanks for your response. But I doubt this answers my question.

Experts please help. Thanks for your time.


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Old 1st December 2009, 03:24 PM   #4
picowallspeaker is offline picowallspeaker  Italy
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Apart from the fact that the pictures you've made are pretty unreadable-undetectable , I suggest you to try both configurations,ie //per pair then two pairs in series ,or series of two // pairs , and I'm not even sure that is the optimal solution , specially when you put in series two coils ,don't know what exactly happens in terms of distortions. I tried a dipole in push-pull with two drivers in series ,and the drum attack is remarkable !
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Old 1st December 2009, 03:36 PM   #5
richie00boy is offline richie00boy  United Kingdom
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The answer is that either way of wiring gives exactly the same result of impedance, Qts, Fs, efficiency, everything.

But for safety sake the best way is to wire two drivers in series, then connect the pair in parallel to another series connected pair. This way ensures that if a driver goes open circuit due to over powering the voice coil then the other paired driver gets cut off so is less likely to get damaged also.
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Old 1st December 2009, 04:13 PM   #6
FullRangeMan is offline FullRangeMan  Brazil
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Hi all,
The best sound quality connection is parallel by a mile, but you should get four 16 ohms speakers for a final impedance of 4 ohms (16ohms/4drivers=4ohms).

The second best is parallel-serie, that is not show in your drawer, the calc is (16ohms/2speaker=8ohms, plus 16ohms/2speakers=8ohms then 8+8=16ohms). For four 8ohms speakers is (8/2=4) + (8/2=4) so (4+4=8ohms)
The worse sound is the serie connection, but in Pro Sound it is used, the speaker impedance is added (4+4+4+4=16 ohms).

As I like line arrays Iam over this issue much years, for my dismay according Scottmoose and others experts in this Site, various FR will have problems of frequency anomaly(comb filter effect etc) see page four at: http://www.diyaudio.com/forums/full-...-fenlon-4.html
Good Luck, Gustavo
P.S.: Please, inform us about the sound results of your experiment in the future.
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Last edited by FullRangeMan; 1st December 2009 at 04:27 PM.
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Old 1st December 2009, 04:19 PM   #7
richie00boy is offline richie00boy  United Kingdom
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Quote:
Originally Posted by FullRangeMan View Post
Hi All,
The best sound quality connection is parallel by a mile, but you should get four 16 ohms speakers for a final impedance of 4 ohms (16ohms/4drivers=4ohms).
Which will then have different Qts and possibly Fs, so you cannot make a valid comparison.
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Old 1st December 2009, 04:34 PM   #8
shaan is online now shaan  India
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Quote:
Originally Posted by picowallspeaker View Post
Apart from the fact that the pictures you've made are pretty unreadable-undetectable , I suggest you to try both configurations,ie //per pair then two pairs in series ,or series of two // pairs , and I'm not even sure that is the optimal solution , specially when you put in series two coils ,don't know what exactly happens in terms of distortions. I tried a dipole in push-pull with two drivers in series ,and the drum attack is remarkable !
Bye
I know what happens when one puts two coils in series, it worsens high frequencies(double the impedance). I am with full ranges here.

Making things clear(er). Red= +ve Black= -ve. But that info is already there. I'm just making things readable. The rest of the fact is unimportant.

thanks.
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Old 1st December 2009, 04:36 PM   #9
FullRangeMan is offline FullRangeMan  Brazil
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Quote:
Originally Posted by richie00boy View Post
Which will then have different Qts and possibly Fs, so you cannot make a valid comparison.
Looks you are thinking this parameters will suffers alterations. By what I know only the CMS may add If the box volume is small for the driver.
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Old 1st December 2009, 04:41 PM   #10
shaan is online now shaan  India
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Quote:
Originally Posted by richie00boy View Post
The answer is that either way of wiring gives exactly the same result of impedance, Qts, Fs, efficiency, everything.

But for safety sake the best way is to wire two drivers in series, then connect the pair in parallel to another series connected pair. This way ensures that if a driver goes open circuit due to over powering the voice coil then the other paired driver gets cut off so is less likely to get damaged also.
I see. Thanks for the information.
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Last edited by shaan; 1st December 2009 at 04:41 PM. Reason: the
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