+ Post New Thread
Results 1 to 7 of 7
Hardware Thread, Amps and Speakers Watts in Technical; I'm trying to order 8 speakers for one of our bigger rooms, i've looked on the net and a pair ...
  1. #1
    DaveMurphy's Avatar
    Join Date
    Aug 2009
    Location
    Manchester
    Posts
    210
    Thank Post
    12
    Thanked 9 Times in 8 Posts
    Rep Power
    13

    Amps and Speakers Watts

    I'm trying to order 8 speakers for one of our bigger rooms, i've looked on the net and a pair is 75W which is in total 300W do i need a 300W amp? can i go to a 320W amp? how's it work?



    Cheers

  2. #2


    Join Date
    Oct 2006
    Posts
    3,412
    Thank Post
    184
    Thanked 356 Times in 285 Posts
    Rep Power
    149
    Make sure the "watts" are always in RMS when matching them up.

    Each speaker must have its own channel ie you cant have 4 speakers running from a 2 ch amp (well you can but i wont go into it here).

    How big is big? The longer the run, the better quality cable you will need, and even then you might need abit of head room for the longer runs or you might end up with speakers noticably louder than others...

    If you are going for 8 speakers then have a look at multi zone amps. They will allow you to control the volume of each (pair of) speakers, helping with the above problem.

    Why 8 speakers? More isnt always better. Obviously depending on usage; i would normally go with a decent pair of stereo speakers over 4 pairs of not so good ones.


    Oh and probably the most important point of all; not all speakers are built equal, a pair of 75watts rms arnt always going to be louder than a 50watt rms pair, or even a 40 watt
    Last edited by j17sparky; 26th October 2009 at 02:40 PM.

  3. #3

    mac_shinobi's Avatar
    Join Date
    Aug 2005
    Posts
    9,807
    Thank Post
    3,320
    Thanked 1,056 Times in 977 Posts
    Rep Power
    365
    prolly a daft statement / question but isn't 8 speakers classified as a 7.1 setup

    7 speakers and the .1 being the sub woofer so 8 in total ( not sure if the sub is classed as an extra speaker or not )

  4. #4

    powdarrmonkey's Avatar
    Join Date
    Feb 2008
    Location
    Alcester, Warwickshire
    Posts
    4,859
    Thank Post
    412
    Thanked 777 Times in 650 Posts
    Rep Power
    182
    Quote Originally Posted by mac_shinobi View Post
    prolly a daft statement / question but isn't 8 speakers classified as a 7.1 setup

    7 speakers and the .1 being the sub woofer so 8 in total ( not sure if the sub is classed as an extra speaker or not )
    Only in setups designed like that - in pure stereo, you just get the same sound coming from each pair.

  5. Thanks to powdarrmonkey from:

    mac_shinobi (26th October 2009)

  6. #5
    DaveMurphy's Avatar
    Join Date
    Aug 2009
    Location
    Manchester
    Posts
    210
    Thank Post
    12
    Thanked 9 Times in 8 Posts
    Rep Power
    13
    at the moment theres... umm... theres 11 speakers going through a 120w amp. which isnt giving 'descent' sound, the speakers are old so plan to replace them. the building is really old and the length is about 60 meters.

  7. #6


    Join Date
    Sep 2007
    Location
    UK
    Posts
    5,449
    Thank Post
    1,449
    Thanked 889 Times in 570 Posts
    Rep Power
    647
    60m. Is that the cable length?

  8. #7

    localzuk's Avatar
    Join Date
    Dec 2006
    Location
    Minehead
    Posts
    17,868
    Thank Post
    518
    Thanked 2,486 Times in 1,928 Posts
    Blog Entries
    24
    Rep Power
    838
    Ok, you should be looking at the resistance of the speakers and the channels on the amp. So, for example, if your amp does 4 Ohms per channel, and you have 8 amp speakers, you can run 2 on a single channel in parallel.

    8/2 = 4 Ohms

    There's a lot of good advice in this thread: multiple speakers will i blow amplifier - AVForums.com

SHARE:
+ Post New Thread

Similar Threads

  1. USB Speakers
    By SpuffMonkey in forum Hardware
    Replies: 0
    Last Post: 7th October 2009, 03:58 PM
  2. Speakers for Sale
    By mparkin in forum AV and Multimedia Related
    Replies: 2
    Last Post: 22nd April 2009, 03:14 PM
  3. Interference on Speakers
    By TechSupp in forum General Chat
    Replies: 3
    Last Post: 27th January 2009, 11:52 PM
  4. [Wanted] stereo speakers
    By bigjack in forum Classified Adverts
    Replies: 3
    Last Post: 1st January 2009, 10:27 PM
  5. Speakers
    By GrumbleDook in forum Hardware
    Replies: 20
    Last Post: 4th June 2008, 06:20 PM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •