Why do 800D need so much current?

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  • wettou
    Ultra Senior Member
    • May 2006
    • 3389

    #46
    Originally posted by ryan.devry
    I don't think I would spend 1000 a foot..........lol......
    Neither did I
    Farming looks mighty easy when your plow is a pencil, and you're a thousand miles from the corn field."Dwight D. Eisenhower

    Comment

    • Glen B
      Super Senior Member
      • Jul 2004
      • 1106

      #47
      Originally posted by ryan.devry
      Glen B sorry to take you back down high school.......Oh what good days.....I wasn't even going into phase angles or anything of that nature. I was simply explaining the basic concept behind a speaker, and how current is effective.

      Also I have to dissagree. You canot make a 8 ohm speaker magically become a 4 ohm speaker....Your not adding impedance to the speaker.....Your merely taking of the voltage.

      Some people say that when an amplifier is bridged onto a 8 ohm load, it 'sees' a 4 ohm load. While it is true that the same current flows whether the amp is bridged on a 8 ohm load or a 4 ohm stereo load, the amplifier is driving a 8 ohm load across its outputs. A single 8 ohm speaker can never be a 4 ohm load.
      You were explaining the basic concept behind a speaker, and that's fine, but IMO did not answer the original question. I did not say that an 8 ohm speaker magically becomes an 4 ohm speaker. I was only making a caveat that some amplifiers when bridged will not safely drive loads of less than 8 ohms. This also includes so-called "8 ohm" loads that dip well below 4 ohms for a significant portion of their frequency range, in regions where there is a lot of musical content, and worse, present a severe phase angle (like B&W 800Ds). Such "8 ohm" speakers should be treated like they were 4 ohms. That is not magic, but fact as borne out by the impedance plot, and IMO a sensible approach.


      Comment

      • wettou
        Ultra Senior Member
        • May 2006
        • 3389

        #48
        Originally posted by Glen B
        You were explaining the basic concept behind a speaker, and that's fine, but IMO did not answer the original question. I did not say that an 8 ohm speaker magically becomes an 4 ohm speaker. I was only making a caveat that some amplifiers when bridged will not safely drive loads of less than 8 ohms. This also includes so-called "8 ohm" loads that dip well below 4 ohms for a significant portion of their frequency range, in regions where there is a lot of musical content, and worse, present a severe phase angle (like B&W 800Ds). Such "8 ohm" speakers should be treated like they were 4 ohms. That is not magic, but fact as borne out by the impedance plot, and IMO a sensible approach.
        So is B&W misleading their customers?

        Therefore my 370W amps at 4Ω should be good to go
        Farming looks mighty easy when your plow is a pencil, and you're a thousand miles from the corn field."Dwight D. Eisenhower

        Comment

        • ryan.devry
          Member
          • Apr 2008
          • 60

          #49
          I realize the dip in ohms.....the 8 ohm is nominal.....thanks

          The question was originally about current. So, I explained the basics behind current and the electromagnet........I appreciate the debate tho....
          Ryan
          -------------------------

          Comment

          • stuofsci02
            Super Senior Member
            • Nov 2009
            • 1241

            #50
            Originally posted by wettou
            So is B&W misleading their customers?

            Therefore my 370W amps at 4Ω should be good to go
            Nah.. I don't think they are misleading.. All speakers have different resitances at different frequencies..

            Is 370watts enough at 4 ohms? That depends.. 370 watts will make your speakers go very very very very loud... That does't mean it will sound good..
            Main System:
            B&W 801D
            Emotiva USP-1 Pre-Amp
            Chord SPM-650 Stereo Amp
            Oppo BDP-105
            Squeezebox Touch


            Second System:
            B&W CM7
            Emotiva UMC-1
            Emotiva UPA-2
            Oppo BDP-83SE
            Grant Fidelity DAC-09

            Comment

            • wettou
              Ultra Senior Member
              • May 2006
              • 3389

              #51
              Originally posted by stuofsci02
              Nah.. I don't think they are misleading.. All speakers have different resitances at different frequencies..

              Is 370watts enough at 4 ohms? That depends.. 370 watts will make your speakers go very very very very loud... That does't mean it will sound good..
              Classé should do well I hope
              Farming looks mighty easy when your plow is a pencil, and you're a thousand miles from the corn field."Dwight D. Eisenhower

              Comment

              • stuofsci02
                Super Senior Member
                • Nov 2009
                • 1241

                #52
                Originally posted by wettou
                Classé should do well I hope
                I would definately think so.. Sounds like a CA-2200?
                Main System:
                B&W 801D
                Emotiva USP-1 Pre-Amp
                Chord SPM-650 Stereo Amp
                Oppo BDP-105
                Squeezebox Touch


                Second System:
                B&W CM7
                Emotiva UMC-1
                Emotiva UPA-2
                Oppo BDP-83SE
                Grant Fidelity DAC-09

                Comment

                • wettou
                  Ultra Senior Member
                  • May 2006
                  • 3389

                  #53
                  Originally posted by stuofsci02
                  I would definately think so.. Sounds like a CA-2200?
                  CA-5200 I am itching to get monoblocks, like CT-600M
                  Farming looks mighty easy when your plow is a pencil, and you're a thousand miles from the corn field."Dwight D. Eisenhower

                  Comment

                  • beden1
                    Super Senior Member
                    • Oct 2006
                    • 1676

                    #54
                    Originally posted by wettou
                    CA-5200 I am itching to get monoblocks, like CT-600M
                    I don't remember all of the CT amps that Classe now makes. Do they make a 3 channel amp?

                    Comment

                    • stuofsci02
                      Super Senior Member
                      • Nov 2009
                      • 1241

                      #55
                      Originally posted by beden1
                      I don't remember all of the CT amps that Classe now makes. Do they make a 3 channel amp?
                      Nope but the have a 5 channel amp..
                      Main System:
                      B&W 801D
                      Emotiva USP-1 Pre-Amp
                      Chord SPM-650 Stereo Amp
                      Oppo BDP-105
                      Squeezebox Touch


                      Second System:
                      B&W CM7
                      Emotiva UMC-1
                      Emotiva UPA-2
                      Oppo BDP-83SE
                      Grant Fidelity DAC-09

                      Comment

                      • wettou
                        Ultra Senior Member
                        • May 2006
                        • 3389

                        #56
                        Originally posted by beden1
                        I don't remember all of the CT amps that Classe now makes. Do they make a 3 channel amp?
                        I wished?
                        Farming looks mighty easy when your plow is a pencil, and you're a thousand miles from the corn field."Dwight D. Eisenhower

                        Comment

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