Three 10" 4Ohm subs, wired in series or series-parallel? - Page 2 - diyAudio
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Old 2nd May 2009, 08:09 AM   #11
luka is offline luka  Slovenia
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Quote:
Originally posted by chris661
From what I know, to find the resistance of the 3 in parallel, you need to write them as 1/R (resistance), add them together, then do the 1/ again, so

1/8 + 1/8 + 1/8 = 3/8

Therefore the resistance would be 8/3, or 2.6666666666 ohms, not 0.67

Which means the amp should be happy.


Quote:
three 4Ohm
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Old 2nd May 2009, 09:27 AM   #12
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three 10inch 4ohm drivers each with their own amplifier, will likely perform better than any combination that couples the speaker drivers together.
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Old 2nd May 2009, 10:11 AM   #13
luka is offline luka  Slovenia
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but they must be in their own boxes, each
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Old 2nd May 2009, 10:16 AM   #14
AndrewT is offline AndrewT  Scotland
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no,
three separate amplifiers driving three separate speakers all fitted to the one box.

There is an argument that each driver should have it's own box, but not everyone agrees that better performance is obtained doing this.
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Old 2nd May 2009, 10:23 AM   #15
luka is offline luka  Slovenia
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how would you set 3 amps exactly the same? If you had one amp, one box for all drivers would be better, yes, but not for 3 amp, each driving its own driver
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Old 2nd May 2009, 11:38 AM   #16
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Quote:
Originally posted by chris661
From what I know, to find the resistance of the 3 in parallel, you need to write them as 1/R (resistance), add them together, then do the 1/ again, so

1/8 + 1/8 + 1/8 = 3/8

Therefore the resistance would be 8/3, or 2.6666666666 ohms, not 0.67

Which means the amp should be happy.
3 X 8 = 2.6666 3 x 4 = 1.33333
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Old 2nd May 2009, 12:16 PM   #17
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Quote:
Originally posted by luka
you can't put 3x 10" on stereo amp... not any normal one...

Sure you can. Wire them in series and bridge the amp mono. Any 'normal' amp would be able to drive this load.


Quote:
Originally posted by I Am An Idiot


3 X 8 = 2.6666 3 x 4 = 1.33333

Absolutely, just as you clarified before.

And bridged mono would be effectively equivalent to 0.67 ohm stereo load. (I know some folks don't like to say it that way.)
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Old 2nd May 2009, 01:36 PM   #18
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by luka
how would you set 3 amps exactly the same? If you had one amp, one box for all drivers would be better, yes, but not for 3 amp, each driving its own driver
how much does exactly the same mean?
same tolerance as the drivers?
Or ten times closer tolerance than the drivers?
Or, something else?
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Old 2nd May 2009, 06:19 PM   #19
luka is offline luka  Slovenia
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To get most out , all has to be driven the same, if you just have to have something, anything will do, even by ear
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Old 7th May 2009, 06:35 AM   #20
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ok check this out... running three drivers in series parallel with an ohm load of 12 isn't practicle inless your setting it up for some kind of a competition. to recap on the original topic... i would recommend running the three drivers you have in parallel. if your amp isn't 1 ohm stable then i recommend either... 1. buying an amp that is 1 ohm stable. or 2. buying new drivers that will run in accordance with your amp.

i also am not trying to cause a conflict between opinions. that is why we all are members of this site. to learn and to educate in the matters of audio performance. i have been installing car audio and mobile electronics since 1999. i have a vast knowledge of products and technique. running three svc subs to a 12 ohm load set up isn't in the benefit of the overall performance of the sound system.
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