Subwoofer Distance Setting - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
  • 6 Post By Jim Farina
Thread Tools
post #1 of 1 Old 08-03-2015, 10:42 AM - Thread Starter
Jim Farina's Avatar
Join Date: Sep 2005
Location: Youngstown, OH
Posts: 89
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 325
Subwoofer Distance Setting

If you check your receiver settings after some sort of "auto setup"(Audyssey for example) and it sets the subwoofer further than seems correct. Don't automatically assume it has made an error.

Most high performance subwoofers use state-of-the-art micro processor controlled amplification these days. This tends to increase efficiency, longevity, and overall sound quality for reasons I will dive into at a later date. For now I'm going to focus on DSP enabled amplification and how this relates to the distance setting in your receiver. The correlation is fairly simple. The DSP(digital signal processing) will impart a signal delay usually measured in milliseconds. A common delay would be 5 milliseconds. The speed of sound is (roughly) one foot per millisecond. So a 5 millisecond delay will cause your receiver to set the distance setting about 5 feet more than the physical distances involved.

It may seem counter intuitive at a causal glance but the larger the distance setting, the LESS of a delay the subwoofer signal gets. Example. You have two subwoofers in the room and one is 3 feet from the seating position and the second sub is 10 feet from the seating position. The second subwoofer(10 ft away) will have its output arrive approximately 7 millisecond later(remember, one foot = one millisecond). We cannot "speed up" the speed of sound(this isn't star trek) so we have to delay the subwoofer closer to the seating position as needed.

The distance setting is important as a correct setting will ensure a seamless "blend" between the subwoofer and your main channels at the seating position(s).
m0j0, basshead81, choombak and 3 others like this.

Jim Farina
Jim Farina is offline  
Sponsored Links
Reply Power Sound Audio

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off