Jonny K
Second Unit
- Joined
- Dec 18, 2002
- Messages
- 375
Ok, an update. I've been playing with the BFD and tweaking my settings for several days. This is what I ended up with:
The blue line is the response curve before the BFD is used, the pink line is the new curve. You'll notice that around 70 Hz the volumes increase. There is nothing I can do about this, it's my main speakers playing those notes (my Yamaha receiver has a fixed crossover I can't change, and even though it's supposed to be 90 Hz it clearly goes lower than that). To compensate for the high volumes from the main speakers I attempted to raise the sub volume. It's now as high as it goes on the sub, so that's as good as it will get. (the signal from the receiver is reduced significantly, but that's to avoid clipping in the BFD). One interesting thing I noticed is that the dip at 125 Hz would become extremely large for some settings I used (combinations of phase, crossover (on the sub), and BFD filters). I didn't expect to modify such high frequencies!
Overall, a good result. Movies definately sound different now, less boomy. I ended up using 6 filters before I got tired of messing with it.
As for the cable filter, I actually asked a cable guy when he was over at my place installing high speed internet. He basically told me there was nothing he could do. After he left I inspected the cable ground. It was connected to the same pipe that the main electrical ground was, although it was in a different spot. I went and moved the cable grounding wire so that it was attached to the pipe at the same spot the main electrical ground was. I found this reduced the hum (the main speakers no longer pick up on it), but the subwoofer still hums like crazy. Aw drat. The problem with buying that cable filter from Parts Express is that it's 10 dollars US for the filter, and 10 dollars US for the shipping. I'll end up spending 30 Canadian dollars for a tiny little part! I wish I could find it locally. And I don't want the Jensen part because that's even more money (it seems silly to me to spend 100 Canadian dollars on a tiny cable filter when I don't even have HDTV or watch much TV in genearal).
Jonny K
The blue line is the response curve before the BFD is used, the pink line is the new curve. You'll notice that around 70 Hz the volumes increase. There is nothing I can do about this, it's my main speakers playing those notes (my Yamaha receiver has a fixed crossover I can't change, and even though it's supposed to be 90 Hz it clearly goes lower than that). To compensate for the high volumes from the main speakers I attempted to raise the sub volume. It's now as high as it goes on the sub, so that's as good as it will get. (the signal from the receiver is reduced significantly, but that's to avoid clipping in the BFD). One interesting thing I noticed is that the dip at 125 Hz would become extremely large for some settings I used (combinations of phase, crossover (on the sub), and BFD filters). I didn't expect to modify such high frequencies!
Overall, a good result. Movies definately sound different now, less boomy. I ended up using 6 filters before I got tired of messing with it.
As for the cable filter, I actually asked a cable guy when he was over at my place installing high speed internet. He basically told me there was nothing he could do. After he left I inspected the cable ground. It was connected to the same pipe that the main electrical ground was, although it was in a different spot. I went and moved the cable grounding wire so that it was attached to the pipe at the same spot the main electrical ground was. I found this reduced the hum (the main speakers no longer pick up on it), but the subwoofer still hums like crazy. Aw drat. The problem with buying that cable filter from Parts Express is that it's 10 dollars US for the filter, and 10 dollars US for the shipping. I'll end up spending 30 Canadian dollars for a tiny little part! I wish I could find it locally. And I don't want the Jensen part because that's even more money (it seems silly to me to spend 100 Canadian dollars on a tiny cable filter when I don't even have HDTV or watch much TV in genearal).
Jonny K