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Old 12th January 2008, 11:26 PM   #1
Lifo is offline Lifo  United States
diyAudio Member
Join Date: Jan 2008
Default question on my 4ohm subs / dual voicecoil

i have
2 alpine type R SWR-1242D
12" Subwoofer (4 + 4)
Power Handling Capacity (RMS): 500W
Power Handling Capacity (Peak): 1500W

i have them on a 1500watt directed amp ( oldstyle )
i have them all ran together ( dueled )

so am i running them @ 1 ohm or 2ohm?
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Old 12th January 2008, 11:49 PM   #2
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Join Date: Dec 2007
If your amp is run mono it will see 1/2 the load, meaning if you bridge an amp on a 4ohm speaker it the amp will be at a 2 ohm load.

If you run your coils in series it will double the impedance, in parallel it will cut it in half.

1. 2X-4 ohm speakers can make 8 ohms or 2 ohms depending on HOW its wired together.

2. A 4 ohm load is on each channel of an unbridged amp and the amp will see 4 ohms.

3. If you bridge the amp the 2X- 4 ohm drivers wired in series the amp will see 1 ohm, if they are wired in parallel the amp will see 4 ohms.

5. If your amp is run mono with 2X-4 ohm drivers the amp can only see 4 or 1 ohm.

6. drivers with dual VCs @ 4 ohms can make 8, or 2 ohms, this could make a 16, 4 or 1 ohm pair....meaning a mono amp could see 8 ohms, 2 or 1/2 ohm!!!!

7. Good luck and dont blow your amp up.

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Old 13th January 2008, 12:17 AM   #3
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Join Date: Mar 2007
If you have both voice coils of each woofer paralleled, each woofer is now a 2 ohm woofer. If the amp is a 2 channel amp and you have one woofer connected to each channel of the amp, your amp is running 2 ohms per channel. If the amp is a 1 channel amp and you have the woofers paralleled at the amp, your amp is wired 1 ohm mono.
If it ain't broke Don't fix it
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Old 13th January 2008, 01:06 AM   #4
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Join Date: Dec 2007
How did you wire the coils??

Your final mono loads are 1,4, and 16 ohms.

Stereo you have either 2 or 8 ohms stereo.

What is the exact model number of the amp???
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