I need a few questions answered, please help.

I'm not sure that you will see any difference. You're using the same box and the same amp, only the speaker has been changed. So lets look at some basic physics, both are 12-inch speakers, so they have the same surface area so they will move the same amount of air. So nothing has changed there.

Your box is a bandpass, tuned to the same frequency so no change there. And finally the same amp.

There might be a slight difference due to difference in the speaker specs themselves, but it will be minimal.

If the amp will handle the impedence, then wire them parallel. Keep in mind that those woofers have 4-ohm coils, you will end up with a 1-ohm load. Will the JL amp handle that load?

 

I would double check your owners manual. I believe that it can handle a 1-ohm load but I'm not 100% sure

 

Id upgrade from W0 to W3, if you want more then that, the W6...

JL has never let me down

 

Upgrading to a W3, W6 or whatever will not help. Again, they have the same surface area, so they move the same amount of air. We will not see any improvement. Basic physics are at work here. Quite throwing money away on woofers.

But your main problem is the bandpass box. It is set to a particular tuning frequency determined by the port and the chamber size. That tuning has not changed regardless of what woofer you put in it.

If you wanna see an improvement, get another box and keep your W0. Lets change what matters. You already have a new set of speakers on the way, so lets build a box for them instead

 

You would need a box thats around 3.5 cu ft. plus the port area.

So lets do a box thats 36-inches wide by 14-inches tall by 18-inches deep. The port will be 12.5-inches tall by 4-inches wide. The port will need to be 26-inches long.

Follow the directions here
http://www.caraudiotalk.com/audio-forum/showthread.php?t=7031

 

I built a box myself for 2 12w7s...I used the dimensions from the manual, which can be downloaded online from JL's website

Ive had w3s and w6's in the same exact box and there was a NOTICEABLE difference...saying "its a 12" subwoofer so it wont be any louder) is false...They might be 12" subs, but the Xmax is different (doubled)...they WONT move the same amount air

w0's Xmax is 8.6mm one way
w6's xmax is 16.5mm one way

That is near double excursion...W6 will be louder

 

The dynamics of subwoofer engineering are very interesting. In order to gain in one area, something else might have to be sacrificed. A woofer with an xmax of say 10 can be driven to full output with 100watts. A woofer with an xmax of 20 can be driven output at 200 watts. and vice versa.

Xmax is a nice thing to have, BUT, not the most important thing. Just because one driver has a higher excursion than another DOES NOT automatically make it louder. So many other factors are involved in the science of this. Sensitivity, and Box design are but a few things that will have greater impact. A driver with an xmax of 5 in the right box will play lower and louder on less power than a driver with an xmax of 15 with more power in the wrong box.

I am very tired and will get back to this subject later... Just got back from driving 700 miles! LOL!!

 

We are talking about the same box he has the w0s in

 

Your kidding right.

Surface area moves air, not excursion.

So what your saying is that I can get a 16-inch pizza on a 10-inch plate if I move it up and down alot. I'll try that in a minute.

Get a shovel and scoop up a lot of dirt, then gently drop that dirt, now scoop up about the same amount of dirt and really throw it. In which case was more dirt moved? In one case the dirt was moved further but it was the same amount. Also when you threw the dirt really hard you used more energy. Alot more energy, to move the same amount of dirt.

Now if you have a larger shovel you can move more dirt.

Excursion wastes power, alot of power. You statement is wrong, there was NO difference in volume. If anything the W6 was less loud do to its increased power requirements.

Please show me that it was louder when you switched woofers, because I know it was not.

 

And Viking, your off just a little. To double excursion requires four times more power

100% correct

 

We are talking about speakers, not moving a pizza up and down...or throwing dirt
This is a car audio forum

Where do you get pizza and dirt from a subwoofer?

Ive had a w3, ive had a w6, the w6 was louder in the same box the w3 was in (built to spec FOR the w3)Im talking about experience and not using the "its the same size so its the same volume!!" saying...or throwing dirt or moving pizzas

 

6.5,was the power the same?I've not looked up the w3's or 6's,do they have similar rms and was the ohms the same?

 

Times like these, your profession really shows, Ranger. I had a just had flashback to H.S.

 

same amp, wired to the same ohm load
W3 has an RMS of 500 and was 4 ohm
W6 has an RMS of 600 and was 4 ohm

Box was .75" MDF tuned to 30hz with a 1.75 net volume

 

I teach High School. But remember, I worked in car audio for 12-years.

Lets see if I can make this more simple, the dirt represents the air that we are moving, the shovel represents our speaker area. So show me how excursion (represented by throwing the dirt) lets us move more dirt (which repesents air)

Again show me how what your saying is true.

 

Here is what my software says, both woofers are being driven with 300 watts

The yellow line is a w3 and the red line is a w6