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Noob question about bridging amps???

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  • Noob question about bridging amps???

    I am bridging a 700 x 2 stereo amp that will give me 1400 watts bridged at mono @4 ohms. I cut the end off of one of our leads to connect a banana jack to the amp. The tip wire was positive and the sleeve was for ground, hope I am right. Now I just got two brand new subs to keep us hgoing for the mean time rated at 500 watts cont, and 1000 watts peak. Am I gonna hurt the subs by throwing 700 watts to each speaker, or will I need to run the gain down on the amp. I am still learning about ths stuff, and I hope to gather some insight from you guys. Thanks again for your time.
    Crook Custom Telecaster - Blue Sparkle Paisley
    Fender American Telecaster - 3-Tone Burst
    Mesa/Boogie Stiletto Trident Stage I
    Mesa/Boogie 2-12 Recto Cab
    Peavey Bandit
    Peavey Special 112
    Xotic, Fulltone, Ibanez Effects
    TC Electronic iB Modified G-System






    Originally Posted by charveldan


    Drunk guy through a PV, that's Rock-n-Roll.



    Good transactions: Whirlwind, Geese_com, Ultron, Soundgardener75, Caustic69, EJ, Mercutioburns

    ‎Founder of the HCAF SS

  • #2
    Details please ... amp model, speaker model. Your numbers don't add up.

    When people ask questions like this I expect they are looking for some kind of guarantee. There are no guarantees only reasonable expectations. You are far more likely to damage a speaker by sending too low a frequency than by sending too much (thermal) power. It's unlikely that you could actually ever send 700 CONTINUOUS Watts to the speaker by playing music into the amp.

    Do you have limiters set? Do you have HP filters? If not it isn't gonna matter because without them it's like driving a car blindfolded. At this point your speed isn't your biggest problem.
    Don Boomer

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    • #3
      Amp - Cheapo Behringer EP1500
      Subs - Cerwin Vega 118S Subwoofer
      Crook Custom Telecaster - Blue Sparkle Paisley
      Fender American Telecaster - 3-Tone Burst
      Mesa/Boogie Stiletto Trident Stage I
      Mesa/Boogie 2-12 Recto Cab
      Peavey Bandit
      Peavey Special 112
      Xotic, Fulltone, Ibanez Effects
      TC Electronic iB Modified G-System






      Originally Posted by charveldan


      Drunk guy through a PV, that's Rock-n-Roll.



      Good transactions: Whirlwind, Geese_com, Ultron, Soundgardener75, Caustic69, EJ, Mercutioburns

      ‎Founder of the HCAF SS

      Comment


      • #4
        Those are 250W continuous speakers not 500. I'd recommend just running the amp in regular 2 channel mode with the hP filters set at 50Hz.
        Don Boomer

        Comment


        • #5
          Sorry the Cerwin Vega Subs are INT - 118S. The rms is 500w and max is 1000w. Would pumping 1400 watts to these speakers hurt them, considering they would each get 700 or is it overkill.
          Crook Custom Telecaster - Blue Sparkle Paisley
          Fender American Telecaster - 3-Tone Burst
          Mesa/Boogie Stiletto Trident Stage I
          Mesa/Boogie 2-12 Recto Cab
          Peavey Bandit
          Peavey Special 112
          Xotic, Fulltone, Ibanez Effects
          TC Electronic iB Modified G-System






          Originally Posted by charveldan


          Drunk guy through a PV, that's Rock-n-Roll.



          Good transactions: Whirlwind, Geese_com, Ultron, Soundgardener75, Caustic69, EJ, Mercutioburns

          ‎Founder of the HCAF SS

          Comment


          • #6
            Would pumping 1400 watts to these speakers hurt them, considering they would each get 700 or is it overkill.


            I wouldn't go over than 350-400W without some protection. You'll damage them sooner than later...
            YMMV.

            Release your inner DJ... then you will begin to see.

            Comment


            • #7
              That amp is about 300w a channel into 8 ohms which would be about max for those subs. If you bridge it you'll be burning them up sooner or later .

              "We Have Met the Enemy and He is Us" - Walt Kelly​

              Comment


              • #8
                Cerwin Vega has always been a company not so concerned about super huge "wattage" specs. They build their own drivers, which are generally very efficient for their price point. The more efficient the speaker, the louder it can get with less wattage. Bottom line, don't worry much about throwing all you have at the speaker.

                Frankly, even if you did put 700 into it, you'd likely not even notice the difference. Sound isn't "straight addition". That is to say, double the power does not double the volume. It takes 10X the power to double the volume, which is a 10dB difference (100dB is twice as loud as 90 dB). In theory, doubling the power raises volume only 3dB, which is about the threshold that the "common ear" can tell a difference in loudness.

                So you're really not doing anything but stressing the components of both speaker and amplifier by bridging. I would also at least engage the 30 Hz filters, and would personally use the 50 Hz. This will also maximize output of the amplifier as it won't be trying to sweat out the lowest notes. I don't care what the specs say, it's not putting out usable frequencies below 50 Hz anyway so no sense wasting the power there.

                One last thing - you mentioned turning the amp down as a safety precaution. The "volume" control just attenuates the input sensitivity. The amplifier is still entirely capable of producing it's full ouput power if it gets a signal strong enough. One "oops" moment and the subs could be smoked.
                www.nextexitrocks.com

                Comment


                • #9
                  I still think the bridge function should be disabled on all amps sold to non-professional users. This post is a good reason.

                  I see plenty of blown speakers in for recone for exactly this reason. Complete lack of understanding of power.

                  The CV driver is a fairly robust 250-300 watt RMS driver. Generally works well powered at 400 watts or less w/ a 40-50Hz HPF.
                  -------------------------------------------------------------------------------------------------------------------------------------------------------------------
                  Former product development engineer: Genz Benz, a KMC Music/Fender Musical Instruments Company, continuing factory level product support and service for Genz Benz

                  Currently product development engineer: Mesa Boogie

                  Comment


                  • #10
                    I still think the bridge function should be disabled on all amps sold to non-professional users. This post is a good reason.

                    Or quit beating around the bush and make dedicated bridge-mono amps (again).

                    And replace the front accessable attenuator knobs with limit knobs.

                    I thought Crown had a good idea with their amp model (CT possibly?) that required an adaptor cable to operate in bridge-mono mode (no convenience switch).

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