using Velodyne sub in 2-channel setup?

I finally hooked up the Velodyne using the high level speaker inputs. I had to turn the volume way down on the sub and toy with the crossover a bit. Seems to work well.

the velodyne dls is a powered sub. If I am looking at it correctly, it has rca's IN L/R and OUT L/R. Then it has L/R speaker terminals. I'm not sure I follow Zman. How would I use speaker hookups to sub and still get power to my floor speakers from amp. I am using rebuilt H/K 16a to power focal 918's.

Has anyone else noticed that the bass seems less defined hooked up with the high level inputs?

so if i use high level inputs, the sub will still use the built in amp? I will end up with 2 sets of speaker leads coming out of my power amp? (parallel)

If I use the high level input, will the crossover still filter out low frequency from other speakers?

Zman. I used the digital out on an old cd player for a while. I listened in stereo which enabled the sub to play also. Now that I upgraded to the Sony5400, I use ICs and prefer the "pure direct" mode. The sub is disabled in PD so I followed your advice hooking up the sub with speaker leads from my amp. The signal seems stonger as I had to turn down my sub volume...but less defined.
Maybe the sound difference is between using digital/ICs?
I was just curious if this was the norm? I am very pleased with the 5400, I have settled on a sub volume that is just strong enough to compliment the sound instead of being overkill....just seems to lack the punch; if that makes sense.

Upgrading to a good preamp made a difference throughout system...including subwoofer.