power distribution - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 25th October 2005, 02:53 AM   #1
diyAudio Member
 
Join Date: Oct 2005
Send a message via AIM to robotnation
Default power distribution

does anyone know if there is a way to calculate a good speaker power distribution for a 2 way or 3 way system? I am trying to build a sound system and have no clue how much power to put into each frequency range. If someone knew how much speaker power to get for lows mids and highs, it would help me out a lot. I wish i had access to the funds to get all the same power speakers and then figure out what sounds right from there, but i can't afford that, i need help to get it right the first time.
  Reply With Quote
Old 25th October 2005, 03:07 AM   #2
soongsc is offline soongsc  Taiwan
diyAudio Member
 
soongsc's Avatar
 
Join Date: Mar 2005
Location: Taiwan
The amount of power distributed depends on the number of octaves covered as calculated by the equation N=log(F2/F1)/Log2 where F1 is the lower frequency and F2 is the higher frequency. If you first calculate how many octaves the speaker will totally cover, then you can determine the % each driver sill cover. Note that this normally ends up with XO regions not favored by most purist designers.
__________________
Hear the real thing!
  Reply With Quote
Old 25th October 2005, 07:02 AM   #3
diyAudio Member
 
Cloth Ears's Avatar
 
Join Date: Dec 2001
Location: Melbourne, Australia
From "Loudspeaker Enclosure Design and Construction", published by Fane is the following table. There's an article by Rod Elliot on his www.sound.westhost.com website on bi-amping where he uses this table.

But, essentially, if you're going to cross at 350Hz and 5000Hz, then if your bass amp is 100w/ch, you should only require 70w/ch for your mids and 30w/ch for your tweeters.
Attached Images
File Type: gif fane.gif (4.5 KB, 144 views)
__________________
Jont.
"It is impossible to build a fool proof system; because fools are so ingenious."
  Reply With Quote
Old 25th October 2005, 07:58 AM   #4
Andy G is offline Andy G  Australia
diyAudio Member
 
Andy G's Avatar
 
Join Date: Apr 2002
Location: Newcastle, Australia
Default Try this !!

http://users.tpg.com.au/users/gradds...iles/power.xls


for 2-way, just enter the same x-o freq for 2 values.

obviously only a rough estimate !!! but try the values from the table above, they should be reasonably close !!
  Reply With Quote
Old 1st November 2005, 07:06 AM   #5
diyAudio Member
 
Join Date: Oct 2005
Send a message via AIM to robotnation
thank you all, i will get equal powers al the way around. i already had my crossovers calculated when i posted this. i am doing a 3 way sstem (for now.) my crossovers are going to be at 200 and 2030 hz, and i will cover frequencies from 20 to 20,000 which gives me exactly 3.33 octaves in each frequency range. i already have speakers selected to handle these ranges i jsut wanted to know how many to get, so thank you all for the help.
  Reply With Quote
Old 11th December 2005, 09:25 PM   #6
diyAudio Member
 
Join Date: Oct 2005
Send a message via AIM to robotnation
i just thought of something... does efficiency change the ratios of wattage? like say i had a 9 octave sound system, and a 3 way crossover with 3 octaves in each section. if i had a 100 watt subwoofer with efficiency of 95, a 100 watt midrange driver with efficiency 95, and a 100 wat tweeter with efficiency 95, could i substitute that tweeter for a 50 watt speaker with an efficiency of 98?

PS if any of you have any helpful math tell me about it!

thanks!
  Reply With Quote
Old 11th December 2005, 10:27 PM   #7
diyAudio Member
 
Join Date: Oct 2005
Send a message via AIM to robotnation
oh yea, also, if i substituted the 50 for the 100 going by efficiency, would i have to add any resistors in paralel and/ or series to the speaker or anything liek that? (i always use 8 ohm speakers in all of my constructions, by the way.) I know i wouldn't have to add resitors if the channel was just one type of speaker, but would i, if, say, my midrange was composed of 2 types of drivers of different efficiencies, with 2 way crossovers in the housings, have to compensate for one efficiency with resistance in the higher efficiency speaker?

PS i changed my crossovers to 320 and 2941, giving me a ratio of 10 : 8 : 7. If any of you had info on which ranges contain vocals and stuff i could furtehr change it and perhaps add more to my midrange and cut back on highs to get better sound reproduction.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
3 Way Power Distribution kucharcity Multi-Way 46 14th May 2008 10:17 PM
Speaker power distribution darw82 Multi-Way 3 23rd August 2007 02:53 PM
Power distribution Equation? Pbassred Multi-Way 20 30th January 2006 10:56 AM
My power distribution block revell Everything Else 1 3rd July 2005 03:57 PM
Power distribution among speakers? Tucson Bill Car Audio 1 11th January 2005 03:40 PM


New To Site? Need Help?

All times are GMT. The time now is 06:21 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2