A series inside a parallel... I riddle wrapped in an enigma

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88h88
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Location: Coventry, UK

A series inside a parallel... I riddle wrapped in an enigma

#1 Post by 88h88 » Thu May 25, 2017 7:29 am

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Is there anything inherently wrong with wiring a series/parallel speaker circuit like this?


The amp is rated 230w RMS bridged at 4 ohm with all speakers being 4 ohm resistance. Speakers 1 and 4 are 100w RMS, 2 and 3 are 30w RMS
My math says that 1/4 should be getting ~92w and 2/3 should be getting ~23w, but my gut says that's wrong

I'm trying to reuse the cheap speakers I had laying around
Looking at that makes my head hurt. And also my amp set fire to itself. Someone has asked if this was a good idea and I honestly have no clue myself. :shock:
4xOT12s, 2xT39s@22", TTLS@18", 2xT60@18"

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Bill Fitzmaurice
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Re: A series inside a parallel... I riddle wrapped in an enigma

#2 Post by Bill Fitzmaurice » Thu May 25, 2017 7:45 am

It's much easier to understand if you view the two central 4 ohm drivers parallel wired as a single 2 ohm driver. The result is three drivers series wired, two at 4 ohms, one at 2 ohms. Voltage distribution will not be equal, so this arrangement should not be used. The differing power ratings of the drivers is moot. What does matter is the T/S specs and response will be different, so what you'll end up with is probably not worth doing.

Bruce Weldy
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Re: A series inside a parallel... I riddle wrapped in an enigma

#3 Post by Bruce Weldy » Thu May 25, 2017 7:58 am

I'm trying to reuse the cheap speakers I had laying around
Like making stew out of leftover oatmeal, pickles, chocolate cake, and onions. Just 'cuz ya' got it, don't mean ya' gotta' use it.

6 - T39 4-25" 2-22" 3012LF
4 - OT12 2512 Melded/NSD2005
1 - T24
2 - XF210


"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."

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Tom Smit
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Re: A series inside a parallel... I riddle wrapped in an enigma

#4 Post by Tom Smit » Fri May 26, 2017 12:40 am

:loler:
TomS

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Re: A series inside a parallel... I riddle wrapped in an enigma

#5 Post by CoronaOperator » Fri May 26, 2017 2:03 am

I get speakers 1 and 4 getting 36 watts each, and speakers 2 and 3 getting 9 watts each.
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience

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