Buying new amp, concerned about speaker max input power

Discussion in 'Archived Threads 2001-2004' started by Mike_Mig, Mar 1, 2002.

  1. Mike_Mig

    Mike_Mig Stunt Coordinator

    Joined:
    Jan 17, 2002
    Messages:
    59
    Likes Received:
    0
    Trophy Points:
    0
    I think I have decided that I want a Sunfire Cinema Grand which is rated at 200 Wx5 with all channels driven. I have Paradigm studio series speakers, 100's, 20's, and center. My concern is that the specs for the 20's say suitable amplifier range is 15-150w, and the center is 15-175w. There is also a maximum power input value listed which is 100w for the 20's and 130w for the center. So I am wondering if the Cinema Grand would be overkill wasted power or just damage the speakers. If this is the case I would consider the Sunfire Stereo Amp for just the 100's, which wouldn't be sunch a bad choice either. All input is welcome.

    Mike
     
  2. John Garcia

    John Garcia Executive Producer

    Joined:
    Jun 24, 1999
    Messages:
    11,571
    Likes Received:
    25
    Trophy Points:
    0
    Location:
    NorCal
    Real Name:
    John
    Should be no problem at all. The amp is not going to deliver 200w continuously, unless you turn it all the way up.
     
  3. John Tompkins

    John Tompkins Supporting Actor

    Joined:
    Aug 30, 2000
    Messages:
    660
    Likes Received:
    0
    Trophy Points:
    0
    Mike, your speakers will have no trouble with the sunfires watts, provided you dont turn the volume up to max[​IMG]
    Actually its the other way around. With a less powerful amp it will reach its limit and distort quicker causing possible damamge to you speakers. With a more powerful amp you dont have to worry about this.
    Can you use the power, hell ya[​IMG] It really depends on what the sensitivity of your speakers are as to how much of a difference you might actually hear. Maybe somebody who knows the sensitivity ratings of those particular speakers can answer that part of your question..hope this helps
     
  4. Evan S

    Evan S Cinematographer

    Joined:
    Nov 21, 2001
    Messages:
    2,210
    Likes Received:
    0
    Trophy Points:
    0
    Studio 20's are rated at 89db.

    Buy the Sunfire. Trust me...your music/HT will never sound better. I have a 200WPC amp hooked up to mine with no problem whatsoever. Like they said, unless you go all the way with the volume the speaker will handle the watts with ease.
     
  5. Kevin. W

    Kevin. W Screenwriter

    Joined:
    Oct 27, 1999
    Messages:
    1,534
    Likes Received:
    0
    Trophy Points:
    0
    Mike,

    At one meter away from the speakers if your sensitivity is 89db:

    1watt: 89db

    2watt: 92db

    4watt: 95db

    8watt: 98db

    16watt: 101db

    32watt: 104db

    64watt: 107db

    128watt: 110db

    Unless you listen at extremely high volume levels you should hit reference(105db) with only 64watts

    Kevin
     
  6. Lee-c

    Lee-c Second Unit

    Joined:
    Sep 2, 2000
    Messages:
    497
    Likes Received:
    0
    Trophy Points:
    110
    Kevin. W: There's one important factor you didn't mention. Distance. I forget what the exact formula

    is, but for every extra yard you back away from the speakers after the first yard, you need more power

    to get to reference level volume at your listening position.

    Perhaps someone who knows what affect distance from the speakers has on volume can post

    the formula.
     
  7. Kevin. W

    Kevin. W Screenwriter

    Joined:
    Oct 27, 1999
    Messages:
    1,534
    Likes Received:
    0
    Trophy Points:
    0
     
  8. Michael R Price

    Michael R Price Screenwriter

    Joined:
    Jul 22, 2001
    Messages:
    1,591
    Likes Received:
    0
    Trophy Points:
    0
    You lose 6 dB for each doubling of distance. (Decibel loss = 20*log(1/distance[meters]). So, if you sit 3 meters (10 feet) from your speakers you'll lose about 9 dB. But then there's also boundary gain (reflected sound from your room) which will add something like 2-4 dB especially if you sit far away from the speakers and/or near walls. So I'd say your overall sensitivity is something like 83 dB at the listening position, meaning you might be running into peaks of over 100 watts at reference level.

    Either way, you're definitely not in danger. I'm sure the Paradigms can handle plenty of clean power, especially the 100s (the center and surrounds don't get as much power anyways. Especially if you run them small which you should.) And with 200 watts you're unlikely to clip the amp. So go ahead, I'm sure that setup will rock.
     

Share This Page