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Subwoofer range reduction?

Discussion in 'Model S: Battery & Charging' started by CZguy, Nov 26, 2015.

  1. CZguy

    CZguy Member

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    Jul 16, 2015
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    Prague, Czech Republic
    Folks,

    I have purchased the N.V.X. subwoofer system and it apparently draws 15-40A based on the amount of bass produced. I wonder if you have any real world experience of range reduction with the amplifier on on N.V.X. This would be similar on the stock HiFi system though it has a smaller sub.

    Thanks!
     
  2. pgiralt

    pgiralt Active Member

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    If you were to take the worst-case scenario of the subwoofer drawing 40A continuously (which is definitely not going to happen because you likely don't even have a 40A fuse on the amp that drives it nor will you likely have thick enough wires for that level of continuous draw, plus music is not just a continuous full volume continuous tone), that would be 12V * 40A = 480W. If you were to run it continuously for a whole hour, you would draw 480 Wh from the battery which is about 1.5 rated miles per hour (based on around 300 Wh/mi).

    In reality, I doubt you will notice any difference in range at all.
     
  3. CZguy

    CZguy Member

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    Thanks pgiralt. Very helpful and am embarassed that I did not figure this out myself. Pretty simple math :)
     
  4. supratachophobia

    supratachophobia Active Member

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    This is roughly the same calculation we used when someone did the calcs for the JBL subwoofer install I did a year ago. With the 300 watt mono Class D NVX amp, it was something like .9 miles per hour reduction if the sub was blaring at full blast the entire time.
     
  5. grichard

    grichard Member De-Luxe

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    St. Louis, MO
    Yeah, the range reduction from the subwoofer is so small that... it's in the noise.

    (Thank you... I'm here all week...)
     
  6. Khatsalano

    Khatsalano Member

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    Location:
    San Mateo, CA
    Actually, I've found that subwoofers tend to increase range ... because you gots to drive slower. Will Smith best explained it:

    "Leanin' to the side but you can't speed through
    Two miles an hour so, everybody sees you."

    - K

     

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