400 watts X 7 in one box WOW!!

Discussion in 'AV Receivers' started by terence, Jul 9, 2003.

  1. terence

    terence Supporting Actor

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    2,800 watts total from Sunfire. Do you think this is over kill? What are you guys thougths?

    Here are the Cinema Seven Signature
    specs......

    [​IMG]

    Feature and Specs
    400 watts rms continuous per channel, all channels driven into eight ohms from 20Hz to 20kHz with no more than 0.5% T.H.D.
    800 watts rms per channel into four ohms
    1600 watts rms per channel into two ohms – time-limited basis
    Two output options for the main left and right channels: current source for a warmer, more open tube sound or voltage source for all the tight response this awesome solid state amplifier can deliver
    Intrinsic frequency response one Hz to 80 kHz
    Signal present auto-on switch senses input signal on any channel and automatically powers up
    12VDC trigger input with 1/8" mini jacks as well as plug-in screw-terminal strip
    Balanced XLR and unbalanced RCA inputs
    High-quality five-way binding posts
    Dimensions: 19" wide, 6.5" high, 15.75" deep
    Five-year parts and labor warranty
    Architectural model:
    Standard 17" width allows installation in standard rack systems
    17" wide, 5.9" high (including feet), 16.7" deep (to tips of connectors).

    http://sunfire.com/cinemaseven_signature.htm
     
  2. Frank_S

    Frank_S Supporting Actor

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    At 400 wts/ch x 7, it is a pretty light amplifier. The combined weight of my 2 channel and 3 channel Aragon amps is 143 lbs, the 2 channel alone weighs 73 lbs.[​IMG]

     
  3. Andrew Pratt

    Andrew Pratt Producer

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    wow now that's an amp...wonder how well it bench tests...that's a lot of power to try and pull from a 15A line.
     
  4. RobertR

    RobertR Lead Actor

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  5. Mark Hedges

    Mark Hedges Second Unit

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  6. Chu Gai

    Chu Gai Lead Actor

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    You could play around with that by sticking something like a 4 ohm resistor in series with the speaker. It's faking the performace characteristics of a tube but then it really depends how one designs their tube amps. Some can be transparent like a decent SS design. OTOH, if you've got hormonally driven teenagers who like to crank it up behind your back, an inline fuse might make a bit more sense [​IMG]
     
  7. David_Stein

    David_Stein Second Unit

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    maybe i just havent looked at the specs for big amps like that, but doesnt the .5% THD limit they give in the specs a bit high?
     
  8. Claude M

    Claude M Stunt Coordinator

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    energy can neither be created nor destroyed but only transformed from one form to another (was that Newton?) will need a 20A circuit!
     
  9. Chu Gai

    Chu Gai Lead Actor

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    Well if that's what Carvers says you ought to have then get thee a 20 amp circuit. My son's got a 4 or 5000 watt Crown that's never tripped a 15.

    As far as that level of distortion being on the high side, that's a question with no easy answer. The audibility of non-linear distortion is highly dependent upon the source material as well as the environment in which you're listening in. A general answer, that may or may not sit well, is that if the distortion is somewhere around 5% it's a pretty safe bet that you'll notice it with a pretty broad range of material. Somewhere around 1%, 0.8%, 0.5%, it becomes supremely difficult and you might have to resort to the dreaded DBT to accurately come to an answer. Go down another factor of 10 or more, then not a chance in hell.
     
  10. Jason.Soko

    Jason.Soko Stunt Coordinator

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    What in the hell do you do with 2800 watts. Sell tickets for your movie theater?
     
  11. Thomas_Berg

    Thomas_Berg Screenwriter

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    i'm a little wary of the 44lb weight rating of the 19" Sig amp. not to take anything away from Sunfire or anything, but my Classe CA-150 stereo amp weighs in almost 15lbs heavier. unless there's something truly groundbreaking about this design (or it's a misprint), i'm gonna remain skeptical.
     
  12. RobertR

    RobertR Lead Actor

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  13. Frank_S

    Frank_S Supporting Actor

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    Heatsinks are not very heavy at all, I make them for a living and even the large ones on my Aragon amps are lightweight, just a lot of thin fins.
    The weight is in the massive toroidal transformer(S)that a lot of SS amps have which it seems, the Sunfire does'nt have. [​IMG]
     
  14. Chu Gai

    Chu Gai Lead Actor

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  15. Lewis Besze

    Lewis Besze Producer

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    Carver uses the tracking downconversion which he patented.It's essentially switching type amp "close" to what being used on many powered subs these day,in theory anyhow.
    The typical Class A A/B types waste a lot of energy,hence why they need the big power supply and massive heatsink,if they wanna have outputs like these.
    Previous Sunfire Signatures met their ratings very closely with all channels driven.
     
  16. Chu Gai

    Chu Gai Lead Actor

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    Lot's of different ways to make watts. Just think how light the digital amps are going to be.
     
  17. StephenL

    StephenL Second Unit

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    As I understand it, the Sunfire combines a switching power supply (providing high efficiency) with a linear amplifier (Class A for small signals and Class AB for large signals).
    http://www.nortek.net/learning_cente...te_paper-1.htm

    Sunfire does use a large toroidal transformer.
    http://phpix.planetb.net/?mode=album...ater/equipment

    A smaller version of the amp is used in the Sunfire Ultimate Receiver. Sound & Vision magazine tested this receiver and its power output was very impressive.
    http://www.soundandvisionmag.com/art...&page_number=1

    http://www.sunfire.com/cinemaseven_signature.htm
     
  18. Levesque

    Levesque Supporting Actor

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  19. Jason.Soko

    Jason.Soko Stunt Coordinator

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    Hahhahaah.
     
  20. Craig_Kg

    Craig_Kg Supporting Actor

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