2. home-theater
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Setting up a subwoofer

I have a James EMB-1200 with B&W 803s as my main speakers and an AVM-20 processor. When I set the subwoofer level using pink noise from the AVM, I must set the gain on the subwoofer to near max volume (the james has a 1200 amp) to get a consistent read on my Radio Shack SPL between the 803s and the sub.

When I play bass-intensive soundtracks like Lord of the Rings or Star Wars, the bass is overwhelming and the subwoofer gets close to bottoming out.

My question, is there a more accurate way to set the subwoofer level, or is it that movies like Star Wars and LOTR are just over-the-top bass intensive?

Thanks!
rfjaudio
rfjaudio OP
7 posts
 
Appreciate your thoughts! I never gave it much thought that I might be measuring with the SPL in a null node. I only have 3 positions with which to place the sub. two are on the same plane as the main speakers. The third is on a wall perpendicular to the mains (about 10 feet away). I'll give this third spot a try.

Also, any thoughts on using Outlaw's ICBM outboard bass management system or Velodyne's SMS-1 bass EQ in facilitating subwoofer placement and integration?

Thanks!
tgrisham
1,291 posts
 
I have enough experience setting up a sub and was doing it today. Use the Radio Shack analog meter and research the adjustments to each frequency. If you can't find them let me know, but there are many posts around that list them. I have had to move my sub and sitting position around to try to get a flat response. It is almost impossible to be flat across the spectrum. The ICBM will only help with the individual cross-over frequencies for each of your speakers. To tame the peaks, you have to add acoustical alterations to your room or an equalizer. Good luck!
uncertainsmile
88 posts
 
go to www.av123.com. their manual for the ufw-10 has the "exact" calculations for compensating frequencies with the radio shack spl meter. you might be able to download the manual or ask 'em for one.
lej1447
117 posts
 
Ha ha ha. That is pretty funny, Uncertainsmile. I like your response. I think that I could feel what you wrote. When I posted my answer, I knew that Rfjaudio had a pretty good sub, as he posted another thread regarding the calibration for his James EMB-1200. However, I posted my answer b/c he was asking for movie clips, not better sub. Phew. Good luck w/ your quest on both threads, Rfjaudio.
lej1447
117 posts
 
Sorry Uncertainsmile for the wrong post. I had multiple windows opened w/ a bottle of Heineken in my hand at 12AM. Thus, the rest is history. :> ) Now I'm sobber and reading the thread, I go, "huh?"
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