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  • JBL PRX625 VS PRX725 , good update?

    Hello everyone! sorry for my English

    I wonder if the world has had a chance to listen to the PRX725?

    I have a pair of PRX625  since  2-3 years. I love it but except for two small details The rear ported and the amplifier falls protection heat 5-10 seconds in some partys that require a lot of power for several hours

    I will buy me two more boxes. The PRX625 is hard to find here in Canada in the new

    So I ask myself .. PRX725? or to go with the PRX735 PRX625? I do not want a subwoofer, I is not need for my use. I have a pair of JBL4530 for big occasions

    Options..

    PRX625 + PRX725

    PRX625 + 735

    PRX625 x4

    sale the PRX625 and buy only two prx725 for now ..

     

    thank you!

    2X JBL PRX625<br>2X JBL 4530 + head<br>

  • #2

    Disclaimer I have not heard the PRX 725's.

     

    With that said I own 4 prx625's and I like them lots. Many people prefer to join popular logic and say 2x15's dont sound good. That Ok that is their opinion thanks for listening

    So now onto my point I have 4 618s-xlf subs and I also have right now 2 prx 718s-xlf subs. I have not meausured them but to my ear the only diffrent I see in sound is the fan running on the back 7xx vs 6xx. Basing the opinion soley on that I would not expect anything diffrent with the 2x15 boxes.

    In regards to the update of the amp now having a fan if you are having thermal issues this very may wll correct that. Pushing the box hard full range though is still may not.

     

    Conclusion opinion of sonic diffrences none.

    Thermal issues maybe.

     

    JG

    Comment


    • #3
      If you are driving the speaker system hard into protective limiting, the protection will activate to protect both the speakers and the amplifier. If you are indeed driving them this hard, you need more rig for the gig and there is nothing wrong with the amps themselves.

      I recently experienced this with a customer of mine, bitterly complaining that his prx speakers were thermalling like every one on the Internet that he read about ( disclaimer... he is a Dj) and when I looked over his problem it turned out he was driving the speakers within an inch of their lives and the protection was doing exactly as is it was designed to do.

      Comment


      • pgtcobra
        pgtcobra commented
        Editing a comment

        Ok thank you

        but .. It must surely be a better bass with a front ported?

        For the problem of overheating. It happens to me 2-3 times a year when I push the PRX to limit the red light flash sometime, but when it is about 2-3 hours that I play music in a big party.

        Normaly the red light is alway off

        when I install a fan behind each PRX in the same instance, I don't have this problem


      • RoadRanger
        RoadRanger commented
        Editing a comment

        agedhorse wrote:

        I recently experienced this with a customer of mine, bitterly complaining that his prx speakers were thermalling like every one on the Internet that he read about ( disclaimer... he is a Dj) and when I looked over his problem it turned out he was driving the speakers within an inch of their lives and the protection was doing exactly as is it was designed to do.

        My RCF 310A's don't do that. Heck, even my Behringer B412DSP's don't do that.  Maybe JBL ought to figure out what RCF and Behringer are doing differently?


    • #4

      pgtcobra wrote:

      Hello everyone! sorry for my English

      I wonder if the world has had a chance to listen to the PRX725?

      I have a pair of PRX625  since  2-3 years. I love it but except for two small details The rear ported and the amplifier falls protection heat 5-10 seconds in some partys that require a lot of power for several hours

      I will buy me two more boxes. The PRX625 is hard to find here in Canada in the new

      So I ask myself .. PRX725? or to go with the PRX735 PRX625? I do not want a subwoofer, I is not need for my use. I have a pair of JBL4530 for big occasions

       


      I dimly recall you discussing why you didn't want a subwoofer. That's too bad, because a subwoofer would allow you to high pass your top boxes and thus allow the tops to run cooler.

      I can't remember why you don't like subs - care to refresh my memory?

      BTW, if you're near an L&M you could always try renting a Yorkville 720P, just to see how that might work out for you. Those subs are pretty light and would likely take enough of the load off of your JBL's to perform better (once they are high passed).

      Comment


      • pgtcobra
        pgtcobra commented
        Editing a comment

        Shaster wrote:

        pgtcobra wrote:

        Hello everyone! sorry for my English

        I wonder if the world has had a chance to listen to the PRX725?

        I have a pair of PRX625  since  2-3 years. I love it but except for two small details The rear ported and the amplifier falls protection heat 5-10 seconds in some partys that require a lot of power for several hours

        I will buy me two more boxes. The PRX625 is hard to find here in Canada in the new

        So I ask myself .. PRX725? or to go with the PRX735 PRX625? I do not want a subwoofer, I is not need for my use. I have a pair of JBL4530 for big occasions

         


        I dimly recall you discussing why you didn't want a subwoofer. That's too bad, because a subwoofer would allow you to high pass your top boxes and thus allow the tops to run cooler.

        I can't remember why you don't like subs - care to refresh my memory?

        BTW, if you're near an L&M you could always try renting a Yorkville 720P, just to see how that might work out for you. Those subs are pretty light and would likely take enough of the load off of your JBL's to perform better (once they are high passed).


         

        Hi Shaster

        My old kit is a two NX55p and two LS720P .. i have sold this because the prx625 is Better for lower space, weight and better overall sound ....  view my older post when i have change to PRX625. I have try and compared my old kit three days for my choice

        Sorry for my english but The LS720P is not powerful enough to work with PRX625.

        I have buy Two LS720P for replace the One LS700P

        For the PRX625 , i  need a LS800P but is to big for my car and for one men only

        Moreover, it seems to me that PRX625 has no "bypass" to 100hz only normal and boost

        I prefer carry four PRX625 that two PRX625 subwoofer and two 18-inch

         

         

         


    • #5
      JBL is not selling the 600 series any more because the 700 replaced it. The likely reason for the 700s introduction at this time is the rise in price for the rare earths from china required to make neodymium magnets. I don't think it has anything to do with the amplifier design. But of course I am just guessing.
      <div class="signaturecontainer">--<br><br>Hammond: BC, M3, Split L111, L122 / Leslie: 51, 760 / Yamaha: DGX-620, PF-85<br><br>Follow my new band, <a href="http://DrBombay.ca/connect.html" target="_blank">Dr. Bombay</a>! We're going to be organasmic!</div>

      Comment


      • agedhorse
        agedhorse commented
        Editing a comment

        Some class D amp designs run hottest at idle and do not get any hotter under load. This is a specific design technique related to distortion reduction management. It's not a big deal.


    • #6
      I have been concerned about the thermal management on the PRX line since it's introduction. I don't usually disagree with Andy .... Because I generally don't like being wrong clearly the primary reason for the 7XX was the price of neo magnets going up 500%. It is also pretty clear that they took the opportunity to correct their thermal management issues. I would state that my XLFs have never shut down. I do agree that lowering output is a better strategy than shutting dowd.
      With Greater Knowledge Comes Greater Understanding

      Comment


      • pgtcobra
        pgtcobra commented
        Editing a comment

        OneEng wrote:
        It is also pretty clear that they took the opportunity to correct their thermal management issues. I would state that my XLFs have never shut down. I do agree that lowering output is a better strategy than shutting dowd.


        Hi!

        I play Saturday with two prx612 with my two PRX625 at the same volume and input DB

        after 4 hours , the prx612 is very very cold vs my prx625!

        I burned his hand on the PRX625.

         

        To return to the main topic, I hate to hear the difference between the 600 vs 700.
        And especially why the 20 pounds more

         

         


    • #7
      I prefer not shutting down as well, but it's an option that is sometimes used once a speaker has been driven harder that traditional limiting management proves useful.

      Comment


      • #8
        The main advantage is continued production of a good speaker category. Otherwise, what would they have to offer in this class?

        Comment


        • ChiroVette
          ChiroVette commented
          Editing a comment

          agedhorse wrote:
          The main advantage is continued production of a good speaker category. Otherwise, what would they have to offer in this class?

          I have no idea. I do know that the 700 line is more expensive than the 600 line was even when it was the current line and at the top of its price.


          There are still new 600 line speaker cabinets to be had and they are significantly LESS expensive than their 700 line equivalents. So let me ask the question this way: What advantages do I get with new PRX700 speakers (say 712m and 718XLF) over the 600 line cabs?


          lol I already know what advantages JBL gets by me buying the 700 cabs.


      • #9
        I suspect that the claim of 90% efficiency is possible with active PFC and syncronous rectification, in addition to paying attention to the details throughout. The real questions and practical challenges revolve around reliability and cost.

        Also, it should be noted that how efficiency is measured could skew the results in meaningful ways.

        Comment

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