mixed series/parallel wiring

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Tarzann
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mixed series/parallel wiring

Postby Tarzann » Tue Feb 20, 2007 4:06 am

Might be a stupid question, but I figured I'd better ask just in case.

In a multi driver system, will the wire configuration make any difference with regards to the amount of power delivered to each driver?

Example:

-start with (10) 4 ohm drivers
-parallel wire 2 groups of (4) drivers for (2) 1 ohm loads, and parallel remaining (2) drivers for a 2 ohm load, resulting in 3 groups of drivers.
-series wire the 3 groups (1 ohm, 1 ohm, and 2 ohm) for a resulting 4 ohm load to the amp

(It can be done other ways, the desired result is a 4 ohm load from (10) 4 ohm drivers.)

Are all 10 drivers going to receive the same share of the total amp output? Any problems with this idea?

Thanks,
Dave
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Postby eezip » Tue Feb 20, 2007 10:36 am

Neither of your methods should be done. There isn't any electrical difference between the two configurations, but the power won't be shared. There are only 2 ways with 5 of the same driver:

1. 2x parallel 5 drivers and them series the 2 groups = 1.6ohm
2. 2x series 5 drivers and parallel the 2 groups = 10ohm

Unfortunately, you can't end up with a final 4ohm load. Your best bet might be to step down to 9 drivers, then you can hit your 4ohm target.

As I said, there will be no electrical difference between the setups, but you will save wire and add reliability with series-parallel.
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Postby Tarzann » Wed Feb 21, 2007 6:10 pm

Thanks for the reply. That's what I thought (uneven power distribution).

Unfortunately the 10 drivers was for cosmetic reasons, not output level, so stepping down to 9 drivers is not an option.

The number of drivers must be:
10,11,12,13,15,16,17 or 18 (lower numbers better only due to reduced cost)

and as said before, the drivers are 4 ohm, and the net system load should be as close as possible to 4 ohms w/o going under.

Time to break out the pen an paper and start running combinations:cwm22:

Thanks again,
Dave
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Clarion DRX-9255:Zapco SL-7:Phoenix Gold EQ-230 (soon to be Audio Control DQX I hope):dual PG mx3i's:PG Bass Cube : feeding 5 PG MPS-2240's and a MPS-2500: currently Vifa/MB Quart drivers, soon to be Adire Tumult 18 :Tempest 10 under dash:Extremis mids:FR125's
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Postby KU40 » Wed Feb 21, 2007 7:04 pm

You could do 16. break into sets of 4, series wire all of them in a set for a 16 ohm load, then parallel wire the four sets of four down to a 4 ohm load.

wow that was a lot of fours.
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Postby Tarzann » Wed Feb 21, 2007 8:04 pm

Yeah, I knew 16 works, gotta do the math and see if it will work with fewer drivers. They are going to cost me about $30 each, and 10 would be enough to reach the output levels I need, so 16 is just an extra $180 per project parts cost.

And yes, that was a lot of 4's:cwm22:
Thanks!
Dave
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Clarion DRX-9255:Zapco SL-7:Phoenix Gold EQ-230 (soon to be Audio Control DQX I hope):dual PG mx3i's:PG Bass Cube : feeding 5 PG MPS-2240's and a MPS-2500: currently Vifa/MB Quart drivers, soon to be Adire Tumult 18 :Tempest 10 under dash:Extremis mids:FR125's
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Postby CBFryman » Thu Feb 22, 2007 1:41 pm

1.6ohm will probably work on a 2ohm amplifer after impeadance rise. Just watch the clipping.
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Postby KU40 » Thu Feb 22, 2007 4:14 pm

Or.......3 ohms will *probably* work for the 4 ohm load you're wanting. I had a 2 ohm load on each channel of my Optimus (radio shack) receiver, and it would play all day until I really tried cranking it, then it would overload and shut off for a second or until I turned the volume down.

Just in case you didn't want to step up to 16 but also wanted more than 9... or something.
-Nick aka NS1 aka mopey aka speedbump

Alpine CDA-9827

Crossfire CFQ5.2

JL Audio XR 650csi components, Planet Audio TT2300

Crossfire VR404 on factory rear 6x8's until I get them upgraded

SI 15D2 + 3.8 @ 30 hz + Crossfire BMF 1000D = :)
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Postby Atomic Fusion » Thu Feb 22, 2007 4:15 pm

You'd be better off going slightly over the impedance than under...

With so much cone area there are substantial effeciency gains anyway...

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Tarzann
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Postby Tarzann » Sat Feb 24, 2007 2:28 am

Thanks to all for the thoughts.

It needs to stay 4 ohm or higher in order to use basic plate amps (Bash 500, Dayton 500).

My first thought was to just bump up to the 16 drivers, but that pushes the price point a bit higher than I wanted it to go. Then I realised with 16 drivers 500 watts is kind of weak, the drivers are just loafing, so may as well bump up to the Dayton 1000 watt plate amp, so now the price point really jumps up....:cwm20:
Oh well, it will be a specialty product, I just really wanted to keep the cost down to reach a larger customer base.
16x$29=$464 for drivers plus $339 for amp = $803 plus enclosure/materials/finish yields about a $1000 cost:cwm16: Granted, it would ROCK, similar to 2 good 18's, but still...

Maybe...
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Postby eezip » Sat Feb 24, 2007 10:51 am

Just because those plate amps are only rated to handle 4ohm doesn't mean they won't be fine running at a lower impedance. In fact, they probably won't mind it at all since you'll only need more current than required to reach 4ohm power at specific frequencies for short amounts of time. And if the amps have a graceful OC circuit you won't even notice. Since those plate amps have AC input, I assume this is for home? And I'm guessing home theater? It might be possible to hear OC protection/clipping/limiting with music, but it's going to be virtually impossible with movie soundtracks. As long as the amp hangs in there, and I'd guess it will, then you'll be ok running the amp under it's rated impedance. And if the clipping/limiting behavior isn't what you want, it shouldn't be hard to push those limits up a bit.

Furthermore, you might be surprised at what 500W can do, especially if the drivers are ported. Give it a shot.
HT: Sony KV-27FS13 | Oppo DV-981HD | Denon AVR-2807 | 7x Cambridge MC100 | Acoustic Research ARPR1010 || Stereo: Dynaudio Audience 42 | Hales Concept 3 prototypes | wouldn't you like to know... :)



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