Hi all, I have a question about my setup -

Marantz 2230 Receiver
Ascend CBM-170SE Speakers
Polk PSW10 Sub

It's not much, I know...but I think it sounds great!

Right now I have my speakers plugged into the receiver, at full-range. I managed to hook my sub up line level by putting Y-cables between the receiver's pre-out and main-in to replicate a sub-out.

Playing music that goes very low, at higher volumes, stresses the 170s. My receiver lacks bass management, but I do think the speakers would benefit from a high pass. Here are the options I've been considering:

1. I know I could run speaker level from the receiver to the sub, and then from the sub out to the speakers. I don't really trust my cheapo sub with so much responsibility, though...

2. Putting a high pass of 50Hz or so on the speakers. I could do this with some simple inline passive FMODs on the main in input. I think this would high pass my headphone output as well, which is unacceptable for my use. I hope I'm wrong about that. Alternatively, is there a way to put the high-pass on speaker level? That might work if its possible.

3. Leave it alone. Is this bad for my speakers?

4. ????

I'd really appreciate any input I can get on this. Thank you!