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Sound issues with amplifier + speakers (crash)

Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   -  
baladur13 Posted messages 47322 Registration date   Status Moderator Last intervention   -
Hello everyone,

I recently bought a Marantz PM5005 amplifier with a pair of Focal Chorus 714 speakers.
However, the sound is crashing, as if the speakers are out of service...

It's the Fnac advisors who recommended this product to me, and I don't think I made a wiring mistake... (A+B for 8 ohms as stated on the back of the speakers)...

Thank you for your information!

8 answers

  1.
    Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1
     
    What do you think of this connection
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    1. LudoTITANIUM Posted messages 4027 Status Member 742
       
      unfortunate you will burn everything

      hpG = A +/- and hpD = A+/-
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    2. LudoTITANIUM Posted messages 4027 Status Member 742
       
      With your jumpers, if your amp blows up, it's normal (it's like putting a jumper in an electrical socket) very dangerous.
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    3. Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1 > LudoTITANIUM Posted messages 4027 Status Member
       
      No, it's not the same, here I'm adding the + and + not the + and -.
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    4. Char Snipeur Posted messages 10112 Registration date   Status Contributor Last intervention   1 331
       
      Hi,
      since this is the only concrete thing, I'm attaching myself to it.
      This assembly diagram is not dangerous, but it is completely useless; terminals A+ and B+ are connected inside the amplifier, there are just switches between the terminals and the amplifier.
      However, if you connected the speakers to A+ and B-, I wonder what that could have done.
      The causes can be multiple, we should do some cross tests. The "crash" sound doesn’t ring a bell for me. Have you tried multiple sources? You haven't connected to Phono (if present) at least?
      If it's new, a return to customer service might be a good solution.
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    5. Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1 > Char Snipeur Posted messages 10112 Registration date   Status Contributor Last intervention  
       
      If I messed up on the phone like a big beginner... Fnac's customer service helped me! Still received it!
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  2. LudoTITANIUM Posted messages 4027 Status Member 742
     
    Hi

    if the 8ohm speakers are connected to the correct TERMINALS ...
    how many speakers are on the amplifier?
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  3. Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1
     
    Yes, but the problem is that I don't know how to connect them at 8 ohms... Do I need to bridge them?
    How many speakers are there on the amp?? What does it mean? On the amp, I have 1 output A L and R and 1 output B L and R...
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  4. LudoTITANIUM Posted messages 4027 Status Member 742
     
    re

    if you have 2 speakers, it's on line A

    https://www.marantz.fr/documentmaster/fr/pm5005n_fr_quickstartguide_ug_v00.pdf
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  6. LudoTITANIUM Posted messages 4027 Status Member 742
     
    the manual
    https://www.marantz.fr/documentmaster/fr/manuel_utilisateurpm5005.pdf
    page 9: you select A for the speakers... and A+B if you have 4 speakers.
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  7. Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1
     
    Yes, I've already seen the manual, it's not that.
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  8. Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1
     
    Since it says A+B = 8 ohms behind the amp.
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    1. LudoTITANIUM Posted messages 4027 Status Member 742
       
      yes, in 8 ohms with 4 speakers > A+B

      it's the amplifier that manages
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    2. LudoTITANIUM Posted messages 4027 Status Member 742
       
      and you have 2 speakers, you plug them into line A.
      and you remove your jumpers, you’re going to burn everything up!
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    3. Niklasss50 Posted messages 45 Registration date   Status Member Last intervention   1
       
      Well, it's well connected, but the sound crashes as if the speakers were broken!!
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    4. LudoTITANIUM Posted messages 4027 Status Member 742
       
      SORRY for you ...
      see the customer service ...
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  9. FocalOfficiel Posted messages 7 Status Member 3
     
    Hello Niklasss50,

    We need a bit more information to assist you. Under what conditions does the "crash sound" occur? At low and medium volume or only when the level rises?
    Your amplifier is 40 watts for a 150-watt speaker. As soon as the level rises too much or if you use the bass and treble adjustments, the amplifier is likely to be driven into saturation.
    The only solution is to check with another amplifier to see if the issue persists, as it is often the small amplifiers pushed into clipping that unfortunately damage the speakers.

    If the problem continues, please don't hesitate to contact our Home Technical Support at support.home@focal.com or our After-Sales Service at sav@focal.com

    Best regards,
    Marine, Community Manager Focal

    Focal-JMlab
    Professional
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