Closed Thread
Results 1 to 4 of 4

Reload Thread: Tech Question about amplifier draw

  1. #1
    LoneRanger's Avatar
    LoneRanger is offline Old Yamahas Give Me Wood



    Join Date
    Dec 2001
    Location
    Wellston, Ohio
    Age
    32
    Posts
    1,379
    Post Thanks / Like
    Images
    10
    Mentioned
    0 Post(s)

    Tech Question about amplifier draw

    I was trying to figure the total amperage draw of all my audio components, and i was wondering if i'm doing this correctly.

    Amperes = Volts/Ohms

    Amperes (in this case how much power my JBL bp600.1 needs to draw from the electrical system to work as it is right now) = Volts (power the amplifier puts out at the speaker terminals on a standard multimeter) / Ohms (i'm running the sub in two ohm mono mode)

    The amp tested at about 35v at the speaker terminals so

    35/2 = 17.5

    is it safe to assume that my amp is currently drawing 17.5a or is there an error in my logic?



    "There is no 'I' in Tag Team"

    Project 'rex: Coming Soon to An Eardrum Near You




  2. #2
    audiolife's Avatar
    audiolife is offline WhAt?



    Join Date
    Feb 2002
    Location
    indiana
    Age
    43
    Posts
    14,375
    Post Thanks / Like
    Mentioned
    0 Post(s)
    speakers are reactive meaning the resistance will change with frequency..



    Sony Mobile ES C-90 Audison Bit-One
    Audison LRx 3.1 MT
    Hertz HSK 130
    Mid Bass ?
    DB Drive K5 15
    Kinetik 1400HC
    avital 2200 alarm
    dynamat extreme

  3. #3
    dreamer's Avatar
    dreamer is offline Senior VIP Member



    Join Date
    Apr 2002
    Location
    Chicago Suburbs, IL
    Posts
    227
    Post Thanks / Like
    Mentioned
    0 Post(s)
    Assuming the amp is 100% efficient, and that you are making 600watts.

    it's more like I = P/V

    so 600/13.8 volts = 44amps or so

    but, since the amp isn't 100% efficient, it is probably more like 50 amps draw from the battery.



    DEX-P9 (headunit)
    DEQ-P9 (30band eq L/R, time alignment, 36dB/oct 4 way crossover)
    Soundstream Tarantula (for subs)
    Precision Power PCX-4125 (for horns and midbasses)
    Image Dynamics CD2 comp mini horns
    Scan-Speak 7" 18W/5535A midbasses
    Subs still pending.

  4. #4
    audiolife's Avatar
    audiolife is offline WhAt?



    Join Date
    Feb 2002
    Location
    indiana
    Age
    43
    Posts
    14,375
    Post Thanks / Like
    Mentioned
    0 Post(s)
    but that isnt an average..you are correct in your math and formula



    Sony Mobile ES C-90 Audison Bit-One
    Audison LRx 3.1 MT
    Hertz HSK 130
    Mid Bass ?
    DB Drive K5 15
    Kinetik 1400HC
    avital 2200 alarm
    dynamat extreme

Closed Thread

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may post attachments
  • You may edit your posts

1e2 Forum