Ultrasonic
Addicted to Fun and Learning
I was just looking at the 708p manual out of curisiosity and it does offer all the time delay options you could want, and does also allow you to apply a high-pass filter to the main speakers (at 60, 70, 80, 100 or 120 Hz but with an unspecified roll-off). Two things you definitely will gain with an SHD Studio though are an easier to apply room EQ (Dirac), which will also importantly cover your subwoofer's output (which the JBLs won't give you the option of).