Can someone explain a few simple things.

Discussion in 'Home Cinema Speakers' started by paulr, Sep 23, 2002.

  1. paulr

    paulr
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    In plain English please.

    What is Bass
    What is treble
    What is frequency
    What is db

    Just trying to get my head round these concepts.
    Thanks
    Paul.
     
  2. smallman28

    smallman28
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    The following may not be totally accurate as its not really my thing but here goes.

    Bass, typically between something like 20Hz and 200Hz?
    Treble,usually describes frequencies above 1000Hz?

    Frequency, the range of sound that a speaker can produce or what your ears hear.
    Something like 20Hz is a low frequency and 20KHz (20,000Hz) is a much higher frequency basically high and low notes.

    db is a measure of the sound level something like 60db is considered normal background noise and 150db would be something like a plane taking off.

    Sometimes speakers are also rated in a db scale and basically the higher a speakers db figure the easier it is for the amp to drive (I think!).

    I am sure someone else will jump in with better explanations and some revelant links as that is a rough explanation in the most basic of terms given my basic undersatnding and I might not be entirely right!
     
  3. Apocalypse

    Apocalypse
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    You've explained that very well smallman, straight to the point and in plain english like the thread starter wanted.

    Now that you're on a roll smallman perhaps you can explain the theory of relativity in plain English :devil: :D
     
  4. Reiner

    Reiner
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    smallman28 is pretty much spot on, some additional comments though:

    What is Bass
    Low frequencies of a music signal

    What is treble
    High frequencies of a music signal

    Note there are also mid frequencies: When a speaker has a 2-way design (two drivers) the bass and mids are reproduced by the "bigger" driver (called a mid/bass driver) while the tweeter reproduces the treble only.
    A 3-way design would split the incoming signal into bass, mids and treble, thus having 3 drivers.
    The crossover (x-over) inside the speaker casing will perform this function.

    What is frequency
    A measure of cycles per second, i.e. how often in one second the signal changes the polarity (from positive to negative). The unit for that is called "Hz" (Hertz)

    This can be applied to e.g. AC mains power (60Hz) or music (20Hz-20kHz), voice is typically around 300-3400Hz.

    When you refer to frequencies like "from x to y" it's called a 'frequency range' or bandwidth.

    What is db
    A measure for amplification or sound pressure. A 3dB increase equals to doubling the output power.
    10dB are perceived as doubling the volume.

    Also the sensitivity of speakers is measure in dB and as smallman correctly says, the higher the easier to drive (less load to the amplifier).


    As for the relativity theory:

    Everything is relativ. :clown: :D
     
  5. paulr

    paulr
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    Ok.thanks guys.......much appreciated:D
     
  6. Ian J

    Ian J
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    very simple :-

    Treble = Top Bits
    Bass = Bottom Bits
    Db = Dangly Bits
    Frequency = The number of times the above get used.

    Incidentally, relativity is illegal in this country
     
  7. kevb

    kevb
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    Not in the forest of dean. Have you seen them down there.:eek:
     
  8. Apocalypse

    Apocalypse
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    LOLOLOLOL, what have I started here :D
     
  9. john87

    john87
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    Laugh out loud out laugh out loud out laugh?!?
     
  10. paulr

    paulr
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    Ian..are you still on about my mum:p :p :p :D
     
  11. baileych

    baileych
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    /me puts on nerd hat

    Actually sensitivity is measured in dB/W measured at a standard distance (1m) from the speaker.

    What HiFi says dB/W/m but this can't be right as if you get 1dB for your watt at 1m your not going to get 500dB for your watt at 0.5km :p

    /me removes nerd hat

    Charles.
     

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