Yamaha NS 670 Pots.

Discussion in 'Speakers' started by csmith, Feb 10, 2019.

  1. csmith

    csmith AK Member Subscriber

    Messages:
    363
    Location:
    Tupelo, ms
    Has anyone ever bypassed the mid and tweet level control on Yamaha speakers? I have blown my mids and tweets twice now and am starting to think the pots are the weak link. Can I just unhook them and tie the leads together or should there be a resistor in place between?
     

     

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  2. wmgwizard

    wmgwizard Super Member

    Messages:
    3,274
    Location:
    Browns Mills NJ
    The pots are not the reason you keep blowing the drivers

    Your amplifier is.

    You are pushing your amplifier beyond it's capabilities and causing the signal to "clip" and damaging the drivers.

    You have several options:

    1) TURN IT DOWN
    2) buy a more powerful amplifier
    3) get more sensitive speakers
    4) install fuses in line with your driver's, probably 1- 1 1/2 amp for the tweeter and 1 1/2 to 2 amp for the mid-range.

    PM me, I may have a spare set of drivers.
     
  3. Gnesen

    Gnesen AK Subscriber Subscriber

    Messages:
    1,570
    I tend to agree. Surprisingly, NS-670s are only rated to handle 50 watts. However, they are outstanding speakers well worth repairing.
     
  4. csmith

    csmith AK Member Subscriber

    Messages:
    363
    Location:
    Tupelo, ms
    Running them with a Yamaha M-85 controlled by a rebuilt Apt/Holman pre. How much more amp would I need?
     
  5. wmgwizard

    wmgwizard Super Member

    Messages:
    3,274
    Location:
    Browns Mills NJ
    An M85 is WAAAAAAYY more amplifier than those speakers were ever designed to handle and I am a proponent of having more power than your speakers were designed for.

    So I take back my comments about clipping bur stand by my assertion to TURN IT DOWN.

    You are overpowering the drivers and the voice coils are likely overheating and failing.

    You need speakers that can handle 150wpc or more,
     
  6. csmith

    csmith AK Member Subscriber

    Messages:
    363
    Location:
    Tupelo, ms

     

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  7. saltwater

    saltwater AK Subscriber Subscriber

    Messages:
    3,701
    Location:
    East moline illinois

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