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How, just how??? by ayteebee 2008-07-10 14:09:00

Can you have a 120 Watt USB speaker?? (Let's call this Exhibit A.)

Also, could someone please explain THESE - or rather, how a speaker can have a rated power of 280W... but only 5 Watts RMS? (This can be Exhibit B.)

As far as I was concerned 1 Watt of electric power was caused by a current of 1 Amp flowing through a potential difference of 1 Volt. But the USB specification only allows for a current of 500 mA at 5.25 V, giving a MAXIMUM possible power of 2.625 W [1]. So Exhibit A is obviously doing something wrong and I wouldn't connect them to my computer!

As for exhibit B... I honestly don't have a clue how it can have a power of 280 W, but only 5 W RMS.

Something tells me the manufacturers aren't being entirely honest here. Anyone care to explain what's going on?


-----------
[1] http://www.beyondlogic.org/usbnutshell/usb2.htm#PowerVbus

[ Reply ]
  120 Watt batteries? (n/t) by Hieraco2008-07-10 14:12:51
  It's probably equivelent wattage by EndlessWaves2008-07-10 14:14:20
  RMS, speakers, marketing and lies... by McNutcase2008-07-10 14:17:15
    Almost right by desiredusername2008-07-10 14:44:34
      So I oversimplified a little. Give me a break. by McNutcase2008-07-10 14:49:40
        *Tosses a break to McNutcase* by desiredusername2008-07-10 14:52:29
          Sorry, I'm boycotting Nestle... (n/t) by McNutcase2008-07-10 14:53:27
            Aren't you in the US now? by kelli2172008-07-10 14:59:40
              "Made By Hershey" is enough for a boycott! by vetitice2008-07-10 15:03:40
                Reese's "Big Cups" are tolerable. by Phoon2008-07-10 15:48:37
                  Only one problem there... by McNutcase2008-07-10 16:06:48
                    I like peanut butter, but... by werehatrack2008-07-10 16:36:32
                      I've had few issues with Mars. by Phoon2008-07-10 16:40:09
                        Yup. The Swiss know good chocolate. by McNutcase2008-07-10 16:41:19
  They're effectively lying. by espire2008-07-10 14:21:35
  Speakers have a seperate power supply... by raptor_872008-07-10 14:22:21
  these guys explain the disinformation by bking012008-07-10 14:41:11
    Bookmarked :) by ayteebee2008-07-10 17:00:49
  I have a picoPSU rated at 120W that came with an by kahuana2008-07-10 16:12:19
  Lies, Political Platforms, and MarketSpeak by OddParity2008-07-11 06:09:56
    If I were writing regulatory standards... by OddParity2008-07-11 09:14:49

 

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