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Old 17th August 2011, 09:03 PM   #1
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Default Wiring 2ohm sub in stereo mode

I have a subwoofer which reads out 2.7ohms, I hooked it up bridged to a 4 channel amp and the amp goes into protect mode, so I looked at the amp's documentation, which states the impedance goes 4-8ohms in bridged mode and 2-4ohms in stereo mode. How can I hook it up in stereo mode?
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Old 17th August 2011, 09:07 PM   #2
kevinkr is offline kevinkr  United States
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Does the woofer have dual voice coils or just a single VC?

If only a single VC you will only be able to use a single channel of that amplifier as it appears that the VC impedance may be significantly lower than 4 ohms..
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Old 17th August 2011, 09:30 PM   #3
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Quote:
Originally Posted by kevinkr View Post
Does the woofer have dual voice coils or just a single VC?

If only a single VC you will only be able to use a single channel of that amplifier as it appears that the VC impedance may be significantly lower than 4 ohms..
It's DVC, but I wired it parallel inside the coil, because It's a subwoofer that I rebuilt, and the original was a SVC.
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Old 17th August 2011, 10:40 PM   #4
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Could you explain what you mean by "I wired it parallel inside the coil" ?

Mike
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Old 17th August 2011, 10:59 PM   #5
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Well, what I did was take the DVC coil, and solder the two positives together, and the two negatives together, then I soldered the positives to the positive terminal, and the negatives to the negative terminals, this gave me about 2ohms, which is what I wanted, because I thought I could run the amp bridged to this single sub, but whenever I hook it up and put up the volume the amp goes into protect mode, and if I run the sub on only one channel it sounds very low, I doubled up on the spider, and I wonder if this could be why it sounds so low? My amp only throws out 75 watts per channel.
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Old 18th August 2011, 12:53 AM   #6
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OK, I'm still not clear on what you did. Did you modify the speaker drivers' voice coil wiring, or are you saying you wired the terminals together? To do it properly you need to connect each voice coil separately to each of the amplifier outputs, that way you won't overload the amp.

Mike
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Old 18th August 2011, 12:57 AM   #7
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I wired the little coil cables positive with positive and negative with negative, and then wired that up to the terminals. Tomorrow I'll undo the coil wiring and wire each side of the coil to a different channel and see how that works, thanks.
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Old 18th August 2011, 12:59 AM   #8
sreten is offline sreten  United Kingdom
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Hi,

Seems you need to undo your paralleling of the coils so they are separate
and 4 ohms each. Your amp might be able to drive each 4 ohm coil with
2 channels bridged, (= 4 channels), if not then just drive with 2 channels.

rgds, sreten.
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