Just look at the 13w7 manual - I think it says the power handling range is 500-1500 rms & anything over 1500 rms voids the warranty. But the overall consensus is 1000 rms only because that amount of power was the largest size amp jl produced before the hd1200/1. Obviously jl knew what they were doing with that d1.5 voice coil configuration (good luck trying to find an amp that puts out that specific power at 0.5 or 3 ohm other than a slash series amp at the time of the w7's initial release
), but nowadays with all these underrated amps its pretty easy to find something to give the 13w7 sufficient power at 0.5 or 3 ohms. I had 1 and then 2 13w7's on a fosgate t20001bd and it pounded, so really whatever sounds good to you will be enough.
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and many more...