avr300, soundmetre & reference level ?

Discussion in 'AV Receivers & Amplifiers' started by paulst10, Apr 23, 2007.

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  1. paulst10

    paulst10
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    hi, after a discussion with another member, i have started to question my 75db reference level

    arcam avr300 volume goes from 0 - 100 as you all know

    soundmetre - C weighted - slow

    avr300 set @ 75 = 72db on the soundmetre for all speakers & 74db for the sub

    my average listening level is about 65 on the amp .. so what is it below ref level ??

    im getting a little confused as it seems most amps ref level is either .. -0 @ 75db .. & some are .. -0 @ 85db .. & the arcam is totally different :confused:

    any help much appreciated :smashin:

    paul
     
  2. Howard0000

    Howard0000
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    "Reference level" is whatever the volume is set at when you're playing white/pink noise and the SPL meter is registering 75dB. Measure it at 65 on the amp and see what level it is :)

    Reference level is a bit of a joke really, it doesn't seem to mean anything, it's just a way of comparing stuff I guess, and it's bloody loud when you watch films at it ;)
     
  3. paulst10

    paulst10
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    hmmm you again :)

    measured at 65 and spl says 72db still .. also ramped it up to 80 and it says 72db - 73db ish :confused:

    looked at my speaker trim settings and i have them

    FL = -4
    C = -4
    FR = -4
    SR = -6
    SL = =5

    i adjusted the FL speakers trim setting to -0 and run a tone at 65 on the amp & it registered 76 on the soundmeter
     
  4. proux

    proux
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    I dont know if this is of any help to you, but Arcam AVR do seem to be designed to be above 50 on the volume dial to get a decent level of sound. There is a post on this by Andy Dutton or John Dawson somewhere I think
     
  5. TopMeTom

    TopMeTom
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    When I done mine I'm pretty sure the FL is used as a reference speaker.

    So get the fl to read 75db on spl the work every speaker round that?
    Readings may be(will check later)

    fl-0
    c+1
    fr+1
    sr-1
    sl-0
    for example...
     
  6. paulst10

    paulst10
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    im going to reset my trim settings all to -0 when i get home later .. is this must be why im not getting much increase in DB's when i turn up the volume ??

    and get them all to read 75db .. but the annoying thing is .. i have an analogue soundmeter and its harder to tell when reading 75db as its right at the edge .. i found 72db a lot easier to read as its pretty much in the middle of the meter :)
     
  7. TopMeTom

    TopMeTom
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    I have the analogue meter as well. The hardest part to read is the sub reading can never get that to be still!!
     
  8. grohan

    grohan
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    Is your SPL callibrated? Start with that first, + or - 3db is not noticeable to the human ear so it would make no difference when listening at 75 if the spl reads 72 or 78.
     
  9. ANDY_DUTTON

    ANDY_DUTTON
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    Hi setting the level to 75dB is a THX refernace level setting. The AVR is not a THX certified product so it is not a relevant setting.

    The loundness of the test tone is not affected by the volume control. The acual level in dB you will get depends on the sensitivity of your speakers.

    All you need to do is measure the level of your front left speaker (or whichever speaker you want to use as a referance) and make sure all the other speakers are at the same level.

    i.e if the speaker measures 72dB with 0dB trim then trim all the other speakers till they are 72dB as well.

    There is no point in turning up the level on all the speakers to make it 75dB as all it will do is mean you end up turning the volume control down 3dB to get the same listening level.

    On a THX amplifer there is a 0dB refernace level set so you can define the playback level as being the same as the mixing engineer used and the same as they use in a Cinema. It is this that is set up using the 75dB noise signal. However for most people in a home environment this is way way to loud.

    I hope this clears up any confusion.

    Regards,
    Andrew
     
  10. TopMeTom

    TopMeTom
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    Thanks Andy.

    Interesting post! Guess I am used to thx stuff oh well we live and learn!
     
  11. paulst10

    paulst10
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    yes thankyou andy :smashin:

    think im gonna just leave it how it is for the time being .. and if i get asked how loud do i listen at .. i will have to reply .. i dont know :D

    suppose you could measure the SPL readings from certain scenes and say .. it peaked at around 85-90db during a particular scene :rolleyes:
     
  12. Hades

    Hades
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    @ paulst10

    When you set up your AVR300 did you use the test tone on the receiver or a test disk?

    Do you set the FL speaker up with a trim of 0 for the test tone on the receiver, as advised to do with the Avia test disk for example?

    I have normally followed what this guy advised here.

    My AVR350 is currently set up from the test tone on the receiver, but I have not calibrated the FL at 0.

    FL - +2
    C - +3
    FR - +1
    SR - -2
    SL - +3
    Sub - 0
     
  13. radio

    radio
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    As andy posted.

    I was going to suggest the same thing as its not a thx cert device which is not a biggie... you should use one as your base/reference speaker and then match the rest to it...

    my room is L shaped mine are something like this

    L - +1
    C - -2
    R - +3
    SL - +1
    SR - +3
    SUB - -4


    Also to do sub calibration there is a bit of a cheat there is a bbc cd i forget what its called bu it has certain frequency tones so you can fine tune the sub by playing the pink noise varying from 16hz - 50hz.
     
  14. Hades

    Hades
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    Going off the link I posted it recommends you have FL at 0 and then match the rest to it by trimming.
     
  15. radio

    radio
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    yes one should do it like that.

    I cheated a bit and set the volume to 75 and adjusted everything to 75db on the meter.
     

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