Question about Rockwood XR-1712 Car Subwoofer

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Getting a loud " POPPING" sound

I have two 12" rockwoods in a sealed (Obcon)enclosed. I'm running them with a "Soundstream" USA Series-305A. When I turn up the volume to around 50% one of them starts to "POP" with every recoil. Is this speaker blown??? It also makes a loud thud when I turn the ignition off. Would some one help me out? It's driving me to the brink!!! Thank Chris

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Re: Getting a loud " POPPING" sound

Switch the wires on the two speakers at the box and see if the problem moves to the other speaker. If the second speaker starts popping and the first one stops, the problem is in your amplifier. If the same speaker keeps popping then you probably have a blown sub.

Posted on Mar 07, 2007

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Why wouldn't you connect the DVC Subwoofer in series, by connecting the other 2 connections Tom?

The impedance tends to be unmatched. It would make the impedance higher and the amplifier will give out a different output wattage.

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Popping noise

Check the sub with a multimeter. It should read the ohms it is rated at when you hook it to the positive & negative inputs. It its off your coil if bad.

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I noticed that the speaker is a 3 ohm.... is this going to be a problem.. matching this up with a 2 channel 4 ohm amp?

If the speaker has a 3 ohms resistance, then yes. That is unless you wire two of them in series, then you would have a 6 ohm load. You just can't drop below the capacity of the amplifier. The only way to do that is to bridge them on your amp. You will only be getting one side of your sound (left or right depending on how you amp is set up to bridge). Go from the positive of one side of the amp to the positive of one of the speakers. The run from the negative of that speaker to the positive of the other speaker. Run from the negative of that speaker back to the negative of the other side of the amp. This is called a series load. Also, by bridging, you may get a little more power out of your amp too. Hope this helps.

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To wire a DVC subwoofer, treat it (in the diagrams) as two seperate speakers, called coil one and coil two. This makes things easier.

To wire them up, wiring them in series would be safer, but if the amp is 2 ohm stable, put them in parallel. Look up dual voice coil wiring in google imagesfor more information and pictures.

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1 Answer

I am running two 15 spl soundstream woofers with a soundstream 500sx amp how do I bridge them to get maximum performance

the 15 spl woofers are dual voice coil, i believe 2 ohms per voice coil.

the 500sx amp is rated 4 ohms bridged at 500 watts, it is capible of dropping to 2 ohms sterao, but no lower than 4 ohms bridged. to get maximum performance, you cannot use both voice coils of both speakers, you can only use one speaker, or both speakers, while only using one voice coil from each.

there is no point of bridging them, you can achieve maximum performance by attaching one voice coil from each speaker to each channel of the amp, while leaving one voice coil from each speaker unconnected. you could also use just one speaker, attaching one vioce coil to one channel, and the other vioce coil to the other channel. then, i would suggest getting a second, identical amp to run the second speaker.

if you are persistent on bridging to mono, then you can only use 2 voice coils (both from one speaker, or one from each speaker) and you must run the voice coils in series, that is, from the amp positive to the 1st vioce coil positive, then run a jumper wire form the 1st vioce coil negative to the 2nd vioce coil positive, then, finally, run the 2nd vioce coil negative back to the negative of the amp.

this is all assumming that each voice coil is 2 ohms and each vioce coil has seperate inputs, meaning that each speaker has 2 pairs of speaker terminals.

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1 Answer

Soundstream amp blows fuses

try to disconect the speakers and turn the amp on and tell if it still blows the fuse

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