RS meter correction factors, and system tweaks

Discussion in 'Archived Threads 2001-2004' started by Justin_Terpstra, Jan 20, 2003.

  1. Justin_Terpstra

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    Anyone have a list of the sub correction factors for the Rad Shack SPL meter.

    I knew it was off slightly but never thought it really made that much of a difference.

    Recently I had my car professionally measured. Of course I had my RS meter in hand too.

    Overall I was peaking at 117db~119db [​IMG] while the professional meter was 125db~128db [​IMG].

    Once I get the values I really wanna go back and recalibrate my home system.

    So far I have used the reciever test tones, should I make a freq CD and set the sub based on a certain freq? Should I pick 35hz, play a custom cd w/ that tone, and set the level based on my RS meter w/ that exact correction factor added in?

    If it helps here's a lil info .... I have a Marantz SR-7000 and I think the crossover is fixed at 80hz. My sub is a Velodyne SPL-1200 w/ the internal crossover set at approx 55hz and down. My mains are Sound Dynamics RTS-9's set to small (dual 6.5's)(Another sister API company to Mirage and Energy). Center is also Sound Dynamics w/ dual 5.25"s set to small. Rears are Paradigm Mini-Monitors set to small.

    Any suggestions are appreciated !!!!

    Thanks in advance.
     
  2. John H

    John H Second Unit

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  3. Wayne_T

    Wayne_T Stunt Coordinator

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    John, are these the corrections for the RS Analog SPL meter?

    Does anyone know if the RS Digital SPL meter requires the same corrections, or is there another table out there?
     
  4. Jose G

    Jose G Supporting Actor

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    Justin,
    Question: Why is you sub set to "55Hz and down?"
    You want your sub's crossover set all the way up and let your receiver handle the crossover at 80Hz, especially since you have all speakers set to small. Otherwise, your loosing info between the 55-80Hz setting. Also, as far as the spl corrections are concerened, you want to calibrate your system with Avia or S&V home tune up, because the internal test tones of your receiver will not provide a tone for the sub. Then, yes- use a test disk (like the Stryke.com test disk or make your own) to measure your subs output at each tone from the disk, and add the correction numbers to what your meter reads- this will give you the corrected values. This is my understanding of it all.
     
  5. Jose G

    Jose G Supporting Actor

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    Wayne- same corrections.

    Here's another list of the corrections from another HTF member:

    This is the corrected values for 1/6 octave from 10Hz to 160Hz and 1/3 octave after that.

    10Hz +20.5
    11Hz +18.0
    12.5Hz +16.5
    14Hz +13.5
    16Hz +11.5
    19Hz +8.0
    20Hz +7.5
    22Hz +6.5
    25Hz +5.0
    28Hz +4.0
    31.5Hz +3.0
    36Hz +2.5
    40Hz +2.5
    45Hz +2.0
    50Hz +1.5
    56Hz +1.5
    63Hz +1.5
    71Hz +1.5
    80Hz +1.5
    89Hz +1.5
    100Hz +2.0
    111Hz +1.0
    125Hz +0.5
    142.5Hz +0.5
    160Hz -0.5

    200Hz -0.5
    250Hz +0.5
    315Hz -0.5
    400Hz 0.0
    500Hz -0.5
    630Hz 0.0
    800Hz 0.0
    1.0KHz 0.0
    1.25Khz 0.0
    1.6KHz -0.5

    2.0Khz -1.5
    2.5Khz -1.5
    3.15Khz -1.5
    4.0KHz -2.0
    5.0KHz -2.0
    6.3KHz -2.0
    8.0KHz -2.0
    10Khz -1.0
    12.5KHz +0.5
    16KHz 0.0
    20KHz +1.0
     
  6. Justin_Terpstra

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    Ok, thats exactly what I was looking for.

    I will try turning the crossover on my sub up.

    I am going to order the stryke cd and avia dvd too. Wheres the best place to get the AVIA disk. On there website its says $50 .... seems like a lot.

    Thanks guys .....
     
  7. SeanDM

    SeanDM Agent

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    I just picked up the RS analog SPL meter to calibrate my new HT setup. Can someone explain how the correction factors are used? BTW, I'm also using the Video Essentials DVD.
     
  8. Jose G

    Jose G Supporting Actor

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    The S&V home tune up disk does basically the same thing and is a lot less expensive- it also include tones for 6.1 which the Avia does not. The video aspect of the Avia is more detailed and it has more demo material me thinks.
     
  9. Wayne A. Pflughaupt

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    This is for Justin and Sean.

    Justin,

     

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