Quote:
Originally Posted by daman4799 /forum/post/0
cyberbri,
What did adding the BFD do to your system. What you just explained on your old setting is excatly where mine is set.
Later, Daman
When I got the sub, first I added room treatments from GIK Acoustics. I got a couple of thinner panels for the sides, first reflection points. This cut down on the reflections from that first reflection point on either side, got ride of smearing / combing, and really opened up and made the soundstage much bigger. I'm hearing more of the speakers and less of the room. I also got bass traps for the front corners. These are thicker panels that absorb bass so there's less cancellation. This helped smooth the frequency response a bit (more traps smooths the response more), and got rid of ringing and boominess (you don't know it's even there until you hear it with that nasty stuff gone), so the bass became much tighter and more detailed.
But being the perfectionist that I am, I wanted to really get the frequency response flat. So I added a Behringer Feedback Destroyer, aka BFD.
I have a lot of graphs here, although none without the bass traps (I should take some...):
http://forum.hsuresearch.com/showthread.php?t=2533
But basically what I was able to do was evaluate the frequency response of the sub (and mains where they overlap), and apply filters that altered the signal being output to achieve a flatter frequency response. The attached image shows a graph that is very close to how I have it set now (shows sub and where the Ascend 340SEs overlap up to 200Hz). I tweaked a few filters after taking the graph, but it's almost exactly the same as in the graph. This is my VTF-3 MK2 in Max Extension mode, 1 port plugged, 180deg phase setting, sub crossover off.
Like I said, I decreased the sub level on the receiver quite a lot so the signal doesn't enter the BFD clipped (my HK puts out a very strong sub/voltage signal). And I used a lot of cuts in the BFD. So to compensate I turned up the sub's gain to get the right level. I'm now running about 3dB hot over the mains.
What eq'ing the subwoofer virtually flat has done, on top of the tightening of the bass with the bass traps, is to let me hear all the bass notes at their proper volume, with a nice house curve rise in the low 20s where most music doesn't touch, but provides great slam for movies. I hear so much texture and detail in music and sound, it's unbelievable. I know part of that is the quality of the HSU, but a lot of it is the bass traps as well, plus eqing the response flat. I'd rather have a $470 VTF-2 MK3 with some bass traps and a BFD than a VTF-3 MK3 with no bass traps or BFD - that's how much the bass traps and eq improves the sound... (of course, ideally I'd have 2x VTF-3.3s, with bass traps and a BFD, hehe).
