optimal amplifier power

Discussion in 'Archived Threads 2001-2004' started by Phil P, Nov 27, 2002.

  1. Phil P

    Phil P Agent

    Joined:
    Jul 4, 2002
    Messages:
    27
    Likes Received:
    0
    Optimally, should you get an amp whose power rating is higher than the maximal recommended power handling of your speakers? If so, then how much higher? Optimally, how powerful an amp should you get for a 4 ohm speaker whose minimum recommended power is 100 watts and maximum recommended power handling is 300 watts?
     
  2. Kevin. W

    Kevin. W Screenwriter

    Joined:
    Oct 27, 1999
    Messages:
    1,534
    Likes Received:
    0
    Usually your better of getting an amp with more power than the speakers need. This way you have some head room for intense scenes. Then again the more sensitive the speakers the less power need to reach reference levels. As far as ohms go just make sure the amp is rated to 4ohms. I believe a sign of a good amp powering 4ohms is the ability of the amp to double output(eg: 100w/8ohm..200w/4ohm) without increasing distortion.

    Kevin
     
  3. Phil P

    Phil P Agent

    Joined:
    Jul 4, 2002
    Messages:
    27
    Likes Received:
    0
    Should you have less powerful amplifiers for your surrounds as the surround speaker max handlings are generally less, or match the same amplifier power rating across the board?
     
  4. Dave Milne

    Dave Milne Supporting Actor

    Joined:
    Jul 2, 2001
    Messages:
    568
    Likes Received:
    0
    Phil,
    The usual rule of thumb is to have equal power all around. In my experience, however, you can get away with a little less power on the surrounds, as long as they're not too much lower in efficiency than tne mains. The center channel, however, gets a lot of info and needs substantial power. My system is

    400 W/chan L-R
    550 W center
    250 W/chan sides
    250 W/chan rears
    550 W LFE sub
    600 W front sub

    I have only once heard the amps clip on the surrounds (Star Wars Episode II at 3dB below reference)

    And I have mixed brands of power amps, which is also generally regarded as a no-no. However, these are all pretty high-end amps and the sonic differences are very minute...
     
  5. EarleD

    EarleD Supporting Actor

    Joined:
    Aug 27, 2000
    Messages:
    728
    Likes Received:
    3
    Dave,
    What brand of speakers are you using. With that kinda power my Klipsch might explode[​IMG][​IMG]
    Are you using pro amps?
    Earle
     
  6. Dave Milne

    Dave Milne Supporting Actor

    Joined:
    Jul 2, 2001
    Messages:
    568
    Likes Received:
    0
    Earle,
    Amps are Bryston, Sumo, and one bridged Adcom. Speakers are all Dynaudio. The mains are large WMTMW towers that will handle gobs of power --my next upgrade will be to swap out the 4BST on the mains to a pair of 7BSSTs (800 watt monoblocks). By the way, when the theater was being built, I ran a separate 30A, 10ga circuit for the amps[​IMG]
     
  7. ChrisWiggles

    ChrisWiggles Producer

    Joined:
    Aug 19, 2002
    Messages:
    4,791
    Likes Received:
    1
    Hey dave... you think you might give me some of those used dynaudios? Perhaps some of those amps too to go with them? [​IMG] You can be sure they will get a good home [​IMG] Good god, you must have your own separate section of the power grid....
     
  8. Guy Usher

    Guy Usher Supporting Actor

    Joined:
    Oct 20, 2002
    Messages:
    780
    Likes Received:
    0
    You need to consider Slew Rates, Rise Timess , Damping etc, etc when using different brand amps
    In your case if you have 100 wpc @ 8 and the ability to play 2 ohm sppeakkers you will be fine Adcoms 7700 will drive anything on the pplanet, exceeeptthiss keyboard. . .( web--tv what can I say)
     
  9. Yogi

    Yogi Screenwriter

    Joined:
    Jul 25, 2002
    Messages:
    1,741
    Likes Received:
    0
    Get as much power as you can afford. You will anyway be able to use only what your ears and your lease can handle[​IMG]. This will just ensure that all the power that you are using is linear and undistorted. Dont worry about speaker ratings as they can handle 4-5 times their rated power for short duration, which is typically how long the transients last. The rest of the time you will only be using a few watts at most. So get the most power your wallet can handle.
     
  10. NickSP

    NickSP Supporting Actor

    Joined:
    May 8, 2001
    Messages:
    569
    Likes Received:
    0
    "I have only once heard the amps clip on the surrounds (Star Wars Episode II at 3dB below reference)"
    Wow, you have 250W/Chan going to your surrounds and that still was not enough power? I don't understand this. [​IMG]
     
  11. Guy Usher

    Guy Usher Supporting Actor

    Joined:
    Oct 20, 2002
    Messages:
    780
    Likes Received:
    0
    Nor do I, please explain, I know "Danes" areineffecient but geeze Louise. . .
     
  12. Yogi

    Yogi Screenwriter

    Joined:
    Jul 25, 2002
    Messages:
    1,741
    Likes Received:
    0
    He could clip his surrounds if he had a huge theater room with 20 ft ceilings and inefficient speakers (
     
  13. Guy Usher

    Guy Usher Supporting Actor

    Joined:
    Oct 20, 2002
    Messages:
    780
    Likes Received:
    0
    I would think that if the room was that big ( auditorum, chhurch) then he would use SR (sound reinforcement) ssspeakers like JBL Pros etc.
    I dont think I would invest so much in "Conssumer" gear for a full house IMO[​IMG]
     
  14. Guy Usher

    Guy Usher Supporting Actor

    Joined:
    Oct 20, 2002
    Messages:
    780
    Likes Received:
    0
    I would think that if the room was that big ( auditorum, chhurch) then he would use SR (sound reinforcement) ssspeakers like JBL Pros etc.
    I dont think I would invest so much in "Conssumer" gear for a full house IMO[​IMG]
     
  15. Guy Usher

    Guy Usher Supporting Actor

    Joined:
    Oct 20, 2002
    Messages:
    780
    Likes Received:
    0
    I would think that if the room was that big ( auditorum, chhurch) then he would use SR (sound reinforcement) ssspeakers like JBL Pros etc.
    I dont think I would invest so much in "Conssumer" gear for a full house IMO[​IMG]
     
  16. Yogi

    Yogi Screenwriter

    Joined:
    Jul 25, 2002
    Messages:
    1,741
    Likes Received:
    0
    Roger that guy[​IMG]
     
  17. Guy Usher

    Guy Usher Supporting Actor

    Joined:
    Oct 20, 2002
    Messages:
    780
    Likes Received:
    0
    I mean it is a big room. . .
    Web-TV SUCKS IMO
     

Share This Page