Austin519

from TLDude:
the thing is im about to buy the amps, he has two of em, so im not sure what i wana run yet, 2 W3s(250watt) or 2 W0s(125watt) what if i run the 2 W0s would one amp b sufficent? and what if i run 2 W3s, then i need two amps rite? and one more thing i thought that the 125.2model is 62.5x2? and that dude told me its 125x2, so which ratings are right?

TLDude:
You still haven't told me the size of the subs...so I'll assume 12" subs. First let me post the specs of the 12 w0's and the 12 w3's.

12 w0
Nominal Diameter: 12 inches (300 mm)
Continuous Power Handling: 125 Watts
Voice Coil: 1.38" diameter, 6-layer, Kapton former
Available Configurations: 4 ohm, 8 ohm or 12 ohm (Single Voice Coil)
Xmax (one-way, linear): 0.34" (8.6 mm)
Sealed Enclosure Range: 1.00-1.75 cu.ft. (28.3-49.5 liters)
Ported Enclosure Range: 1.75-2.75 cu.ft. (49.5-78.0 liters)
VRC˛ Technology: YES

12 w3
Nominal Diameter: 12 inches (300 mm)
Continuous Power Handling: 250 Watts
Voice Coil: 2.25" diameter, 4-layer, Kapton former
Available Configurations: Dual 2 ohm, Dual 4 ohm or Dual 6 ohm
Xmax (one-way, linear): 0.46"-0.51" (11.7-13.0 mm) depending on specific model
Sealed Enclosure Range: 1.00-1.50 cu.ft. (28.3-42.0 liters)
Ported Enclosure Range: 2.00-3.00 cu.ft. (57.0-85.0 liters)
VRC˛ Technology: YES

Now that I have posted that...I want to mention something to you. The w0 and the w3 are two totally different speakers. The w3 is just levels above the w0 in terms of sound reproduction and capacity, and it handles 2x the power. Lastly, the w3 comes in dual voice coil, allowing you to run 1 ohm, 2 ohm, 3 ohm, 4 ohm, 8 ohm, and 12 ohm configurations. So I suggest the w3.

So let's say you pick the w0. You'll get the single voice coil 4 ohm version...and you'll have two of them. So you can wire them in parallel, giving you a 2 ohm load...where you will want to deliver about 150W nominal to each (they're underrated as are all JL). Or you can wire them to separate channels of an amp, which would be two 4 ohm channels at 150W apiece.

Or you could go with the w3's (my choice). You'd get two dual 2 ohm subs, wire their second voice coil in series, and have two subs each with a 4 ohm impedance. Or get two dual 4 ohm subs, wire the second voice coil in parallel, and have two subs each with a 2 ohm impedance.

That said here are your four choices, and the amp you would need for each:

12 w0
1) 2 4 ohm SVC's.
-subs wired in parallel (2 ohm load total)
-Rockford Fosgate 400a2 delivering 400Wx1 (bridged 2/1) @ 4 ohms = 300Wx1 @ 75%
2) 2 4 ohm SVC's.
-subs wired to separate channels (4 ohm load per channel)
-Rockford Fosgate 400a4 delivering 200Wx2 (bridged 4/2) @ 4 ohms = 150Wx2 @ 75%

12 w3
1) 2 2 ohm DVC's.
-voice coils wired in series (4 ohm load per channel)
-subs wired to separate channels
-Rockford Fosgate 800a4 delivering 400Wx2 (bridged 4/2) @ 4 ohms = 300Wx2 @ 75%
2) 2 4 ohm DVC's.
-voice coils wired in parallel (2 ohm load per channel)
-subs wired to separate channels
-Rockford Fosgate 800a2 delivering 400Wx2 @ 2 ohms = 300Wx2 @ 75%

And of course Rockford Fosgate amps are overrated by about 15-20%...so you should be able to reach close to each sub's max (about 200 and 400 respectively) with those amps.

Now as for what he's selling you, "i thought that the 125.2model is 62.5x2? and that dude told me its 125x2, so which ratings are right?". The RF 125.2 is 125x2 @ 2 ohms, or 62.5x2 @ 4 ohms, or 125x1 (bridged 2/1) @ 4 ohms. And it won't be enough to power either of these subs...the w0's or the w3's. You would be okay getting a 160a2, which would run 160x1 (bridged 2/1) @ 4 ohms...to a SVC 12 w0 4 ohm sub. Even so, I'd suggest having more power available than that...because that sub will be more than able to take all the power a 160a2 is giving it. For instance...I usually install a RF 800a4 for JL 12 w6's for customers, which is 400Wx2 (bridged 4/2) @ 4 ohms or 600Wx2 (bridged 4/2) @ 3 ohms = 450Wx2 @ 3 ohms...and of course the nominal rating on those subs is 300W @ 3 ohms...

Hope that helps,
Austin519