This is topic Calculating power needs in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
To visit this topic, use this URL:
https://ft-forum.com/ft/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=002928
Posted by Antonio Marcheselli (Member # 373) on 01-03-2002, 02:05 PM:
Hi everyone,I was calculating some power needs for a theater: does the surround power should be calculate using the centerline of the width of the theater or should I use 2/3 of the width?
Bye
Antonio
Posted by Josh Jones (Member # 447) on 01-04-2002, 11:08 AM:
most likely you would want to do 2/3 width. that way you wont get blasted by the center channel driver. because after all, more power is needed to make those speakers louder.Josh
Posted by Pete Naples (Member # 761) on 01-04-2002, 11:55 AM:
Usually the centre line measurement is used. Watts =
(100-S+20log r )
(--------------)
( 10 )
10
S = Speaker sensitivity (dB SPL at 1 meter for 1 watt)
r = Side wall to centre line in metres.
Sorry, it's really tricky to try and type math formulae and get it to work right.
Posted by Antonio Marcheselli (Member # 373) on 01-04-2002, 02:34 PM:
Thanks Josh and Pete,Josh, I was considering surround channel, did you mean center channel?
Pete, don't worry I have the formula!
Bye
Antonio