Three 10" 4Ohm subs, wired in series or series-parallel? - Page 3 - diyAudio
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Old 7th May 2009, 11:36 PM   #21
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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.
Not series parallel, just 3 x 4ohm woofers in series.

What is impractical about it?

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i have been installing car audio and mobile electronics since 1999. i have a vast knowledge of products and technique.
Congratulations, maybe we should form a club?

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running three svc subs to a 12 ohm load set up isn't in the benefit of the overall performance of the sound system.
Depends entirely on the 3 subs, the amp, the car, and the expectations. But, if you have 3 SVC 4 ohm woofers and an amp that's not stable below 2 ohms stereo, that could very well produce the best results.

Never say never about things car audio.
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Old 8th May 2009, 03:58 PM   #22
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Sorry all, have not had alot of time to update on this set up.

Done! What I've done, I built a box, ran the three subs in parallel (1.33 Ohm to amp), bridged.

It sounds amazing, lots of bass, it is working perfectly. But obviously I am pushing the amp to its limits. I'm pretty sure amp is running alot hotter than it should be.

Tim

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Old 9th May 2009, 04:11 PM   #23
ppia600 is offline ppia600  United States
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What model amplifier are you using?
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Old 9th May 2009, 11:01 PM   #24
jol50 is offline jol50  United States
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I had four DVC subs running coils in series and then parallel, so a 2 ohm load x 1 channel. I swapped another amp in that would only run 4 ohm x 1 for sub, so I wired them pairs in series to get 8 ohms. The subs are all IB in a back seat baffle, so might not be good to run only half of them but I didn't try it since double the drivers should give me around the db of half the wattage anyway IIRC? It has 150rms into 4 ohms I don't know into 8. It works for normal listening, it will not go real loud. But I imagine four 12s of cone area helps output on modest power. The previous amp was 420rms into 2 ohms and shook the car pretty good, I just wanted to test this one out mostly for the sound in the highs and to see if it worked right since it was supposedly broken and does not seem to be after month plus of use. But it must be putting out around 25rms per sub, something to laugh about, however it does work well up to maybe max volume a good stock system would have except it gets pretty deep doing it.

Yeah I would pick up a 1 ohm stable sub amp. I have a little insignia I got cheap that is 400rms @ 1 ohm I think, cheap amp but not tried it yet. It seemed to work well into a 2 ohm sub on the bench.
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Old 10th May 2009, 03:24 AM   #25
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Amp, Pheonix Gold Sapphire 3.0:

http://ampguts.realmofexcursion.com/...pphire_SA3.0X/

Bridged, it's stable at 4Ohm:

1 x 220W @ 4 ohms bridge (12V)

My three subs in parallel are at 1.33Ohm. Heck of alot of bass, and again, the only issue I can see is if I pump the volume loud for too long, due to the heat from the transistors to the heatsink.

So for now it works as I need it. Hoping to maybe get another amp for the subs, and use this amp to power the mids and other speakers when ready.

Tim
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Old 19th February 2014, 12:55 PM   #26
Rewind is offline Rewind  Sweden
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Is everything still alive?
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Old 19th February 2014, 03:13 PM   #27
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Am pretty sure it didn't survive. Unless he had a current limit resistor on the B+, fan over it and properly tuned.

Don't think he will chime in as he hasn't logged on since 2011.
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Old 19th February 2014, 06:02 PM   #28
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Just to be clear!!!!

Grab a calculator and plug 4 in and then hit 1/x plus 4 and then hit 1/x and 4 and then hit 1/x.... as many 8, 4, 2 or 1 ohm loads as you want to figure out...Press = then 1/x.

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Old 19th February 2014, 06:12 PM   #29
Rewind is offline Rewind  Sweden
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If I may continue on this thread. I am getting eight 12" woofers with 4 ohm (same/similar as Metallica uses in the TM Array). I would like to make a nice midbass array out of these. Problem is I want to use a powerful amp and I only have one.
Sound quality wise, is series/parallell just awful? I read series will screw up the Q and reduce my bass.

I.e., four 4 ohm 12" on either side in a vertical array driven by a 400W amp, connected in series/parallell. The amp would see 4ohm.
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Old 19th February 2014, 06:32 PM   #30
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Quote:
Originally Posted by 90scaraudio View Post
Just to be clear!!!!

Grab a calculator and plug 4 in and then hit 1/x plus 4 and then hit 1/x and 4 and then hit 1/x.... as many 8, 4, 2 or 1 ohm loads as you want to figure out...Press = then 1/x.

What????

I think the formula explains it a whole lot better, lol.
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