Hi All, After dealing with some less-than-optimal low end on my current system, I'm looking to add an affordable sub (<$500). I see great things in regards to the SVS SB-1000. But there are two local options on CL that have me wondering if I couldn't get the same result at less cost. Wondering if anyone has experience with either the Sunfire SDS-8 or Martin Logan Abyss? I can get the Sunfire for $200 (maybe less) or the ML for $380. I have a Technics SL-1400/Parks Audio Budgie/Onkyo TX-8050/Monitor Audio Bronze 5s. I'm totally new to setting up a subwoofer, but the Onkyo appears to have a sub out as well as a L/R preout. I don't think either the Sunfire nor the ML have sub in, just L/R. The other factor is that I have to conceal the sub due to space issues. It will have to be located in a corner, behind a TV stand but with ample space around it. Both the Sunfire and ML are downfiring, which helps with this, yes? Because of the placement, do I need to avoid a front firing sub altogether? As you can tell, I'm a complete noob with subs (and audio in general). All I know is I love good music and good sound to go with it. Thanks for your insight!