Wiring 2ohm sub in stereo mode

Godfrd824 · 17th August 2011, 09:03 PM

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?

kevinkr · 17th August 2011, 09:07 PM

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..

Godfrd824 · 17th August 2011, 09:30 PM

Quote:

Originally Posted by kevinkr

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.

Michael Bean · 17th August 2011, 10:40 PM

Could you explain what you mean by "I wired it parallel inside the coil" ?

Mike

Godfrd824 · 17th August 2011, 10:59 PM

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.

Michael Bean · 18th August 2011, 12:53 AM

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

Godfrd824 · 18th August 2011, 12:57 AM

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.

sreten · 18th August 2011, 12:59 AM

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.

17th August 2011, 09:03 PM	#1
Godfrd824 diyAudio Member Join Date: Aug 2011	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?

17th August 2011, 09:07 PM	#2
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	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.. __________________ www.kta-hifi.net

18th August 2011, 12:59 AM	#8
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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17th August 2011, 10:40 PM	#4
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	Could you explain what you mean by "I wired it parallel inside the coil" ? Mike

17th August 2011, 10:59 PM	#5
Godfrd824 diyAudio Member Join Date: Aug 2011	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.

18th August 2011, 12:53 AM	#6
Michael Bean diyAudio Member Join Date: Sep 2004 Location: Minneapolis, Minnesota, USA	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

18th August 2011, 12:57 AM	#7
Godfrd824 diyAudio Member Join Date: Aug 2011	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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