Ok guys. The JL amps are very good amps, but not at the level of the DLS A line or even RA Line. And yes I have used, test, compared them and many other so called highend amps.
And yes the DLS A4 wins hands down compare to the 300/4. Not even in the same class IMHO and I have used and tested both. The DLS A4 is one of the best sounding multi channel amps you will find at any price point, point blank.
As for the A6 vs. the 1000/1, they are both great subwoofer amps and make very clean power, but the A6 is a Class AB vs the 1000/1 being a class D. So the A6 will need more current, but it will sound better. If you want a nice subwoofer some what better than the A6, buy and A3 dual mono
Ok Some will say what I stated above about Class A/B sub amps sounding better is not true, but lets be real here, look at the ultra high end companys like Sinfoni, Genesis, Brax, Steg and even Tru and look at the their subwoofer amp and see what class the are. Don't get me wrong there are and always will be some exceptions.