I recently purchased a JL Audio 12w3v2-D4 for my S2000 thinking that the D4 meant I was getting a 4 ohm sub. So to power it, I bought a rockford fosgate 300s that when bridged makes 300 watts at 4 ohms. However, when I read the manual for the sub, I learned that it is actually a dual 4 ohm sub, which means that when wired in series, it has an 8 ohm total impedence or in parallel a 2 ohm total impedence. Fortunately, I also learned from the manual that the ideal rms range for the sub is actually 150 watts, although it can handle 300. Therefore, my question is, if I wire the sub in series yielding an 8 ohm impedence and wire it to the amp that is supposed to put out 300 watts at 4 ohms, will the net result be 150 watts to the sub?

If so, that would be great. My biggest concern is screwing any of the components up using this setup. In the end, I wish I had done more homework upfront. Then, I would have just bought the 12w3v2-D2 and gotten my 4 ohms to go with my 300 watts from the amp. Any suggestions would be very helpful. Thanks

Nick

 

In theory, if the amp delivers 300 W at 4 ohms, it will deliver 150 W at 8 ohms. In practice it may be a little more than 150.

What is the rating of the amp if you don't bridge it? You may get more power to the sub if you run the amp in 2-channel mode and connect one voice coil to each channel. Example - the amp may be rated 100W x 2 or 300W bridged, so by going 2-channel you can get 200W to the sub. (I'm guessing on the amp rating)

 

Just be sure if you run each coil with each channel you get the polarity correct, else you'll be listening to muddy sound with NO punch.

 

Unbridged the amp yields 75W x 2, so either way it looks like I will be getting around 150W to the sub. Are there any pros or cons to going bridged vs. unbridged, or should I just go bridged, as the wiring is more simple?

Nick

 

[QUOTE]Originally posted by grizwick
[B]Unbridged the amp yields 75W x 2, so either way it looks like I will be getting around 150W to the sub.