How much power is Needed? Multi Channel vs Pro Amps - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 2nd May 2011, 03:04 AM   #1
hawkson is offline hawkson  United States
diyAudio Member
 
Join Date: Apr 2011
Default How much power is Needed? Multi Channel vs Pro Amps

How much power is really needed for 90 db/sensitive speakers in a 5 speaker setup?
How many watts?
  Reply With Quote
Old 2nd May 2011, 04:06 AM   #2
diyAudio Member
 
Join Date: May 2011
Well, that depends on many things. How large is your room, how many watts can the speakers handle and how much sound pressure do you want?
  Reply With Quote
Old 2nd May 2011, 02:16 PM   #3
hawkson is offline hawkson  United States
diyAudio Member
 
Join Date: Apr 2011
The fronts can handle 250 watts. The rears and center 400 watts. The room is 17x16x8(4.8x5.3x2.5)

Loud for movies...
  Reply With Quote
Old 2nd May 2011, 03:44 PM   #4
diyAudio Member
 
Join Date: Apr 2011
what is the RMS rating though?

i hate to be sceptical, but hifi speakers that can handle a true 400w rms are fairly rare

unless you do have a big *** hifi
  Reply With Quote
Old 2nd May 2011, 04:04 PM   #5
diyAudio Member
 
Join Date: May 2011
If the setup is 90 dB/1w1m and let's say you are sitting approximate 5 meters away.
I would say that a loud listening level is around 96-97 dB from your position (5 meters away). With 90dB/1w1m that would be around 110-140 watts of true power for your system.
I would personally get 200 Watts because then you will have more free room to adjust the sound pressure and also keep the THD lower.

Regards,

Simon H.A.
  Reply With Quote
Old 2nd May 2011, 06:54 PM   #6
herm is offline herm  United States
diyAudio Member
 
Join Date: Mar 2002
Location: Pasadena, CA USA
Hawkson is on multiple threads and multiple forums asking people
to educate him on what is the best sub, home theater, amp, etc..

I don't think he's a newb trying to learn.
  Reply With Quote
Old 4th May 2011, 12:59 AM   #7
diyAudio Member
 
Join Date: May 2011
You should have more power for the subwoofer than the other speakers since the human ear are less sensitive to deep frequency.
I've attached a table that shows the human ears response to different frequencies in the audible range.
As you can see the lower frequencies are not as represent as the other frequencies especially at lower sound pressures. Take this in account when you need to find out how many watts of power you need for your setup.

Regards,

Simon H.A.
Attached Images
File Type: jpg Billede1.jpg (74.4 KB, 66 views)
  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
Low Wattage Multi Channel Amps? sumsound Solid State 0 21st December 2010 06:59 PM
Power Supply for multi-channel amp. wsmckenz Class D 8 1st May 2010 08:22 PM
SMPS for diy audio amps and multi-channel diy amps (and their power supplies) tlparker Solid State 18 31st August 2006 10:39 AM
Rotel RB956AX multi channel power amp ostie01 Solid State 2 1st May 2006 10:18 AM
multi-channel amplifier power supplies MikeA Solid State 20 8th April 2004 01:03 PM


New To Site? Need Help?

All times are GMT. The time now is 04:37 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