How to make drain more quiet

I just set up my 10 gal sump under my 40 breeder. I have a Quiet One 2200 which is 581gph. I used to have this sump under my other 40 gallon tank and it was fine using the HOB overflow.

The water is draining into the sump and its cming down fast! Its making bubbles and just too much overall noise. I am guessing that the previous set up worked well because I was only using 1/2" return pvc and it had to loop over the edge of the tank. On my current set up the return just basically goes straight up so it may be getting to much gph. I am going to add a ball valve and turn down the pressure some.

My question is what is the best method of silencing the water drainign into the sump?
 
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