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Thanks to Ramius

Discussion in 'Home Cinema Speakers' started by mart.stokes, Apr 3, 2001.

  1. mart.stokes

    mart.stokes
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    Ramius, the Stryke bass test CD you mentioned to me arrived. What an amazing piece of equipment. Proves one thing, there is no 50hz in my living room! Can't tell if it is the speakers or the room but I suspect the room. Also, I can't hear anything below 26hz, it is there because the SPL meter says it is there but I'm dashed if I can detect it. I must be getting old.

    I will have hours of fun moving my sub around the room, thanks.
     
  2. General Skanky

    General Skanky
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    ?????
    What test.
    Sorry but I missed all of that. Can you tell me what it is please?
    Thanks.

    ------------------
    Douch!!......Wot's da madder, da CIA got you pushing too many penzils?

    Work: www.hughes-tv.co.uk
     
  3. Confucius

    Confucius
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    Check out this site.

    They do a test CD. Ordered mine 2day.

    ------------------
    K'ung Fu-tse (The poster fomerly known as PeteH)
     
  4. General Skanky

    General Skanky
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    Thanks Pete.
     
  5. Ramius

    Ramius
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    Thanks for the thanks mart. :)

    Here are the correction values for the inaccuracies of the Tandy (RadioShack) SPL meter (if you don't have them already)-
    10hz.....+20db
    12.5hz...+16.5db
    16hz.....+11.5db
    20hz.....+7.5db
    25hz.....+5db
    31.5hz...+3db
    40hz.....+2.5db
    50hz.....+1.5db
    63hz.....+1.5db
    80hz.....+1.5db
    100hz....+2db
    125hz....+.5db
    160hz....-.5db
    200hz....-.5db
    250hz....+.5db
    315hz....-.5db
    400hz....0db
    500hz....-.5db
    630hz....0db
    800hz....0db
    1k.......0db
    1.25k....0db
    1.6k.....-.5db
    2k.......-1.5db
    2.5k.....-1.5db
    3.15k....-1.5db
    4k.......-2db
    5k.......-2db
    6.3k.....-2db
    8k.......-2db
    10k......-1db
    12.5k....+.5db
    16k......0db
    20k......+1db

    Obviously you'll only need the 100Hz and below values for your sub.

    The 50Hz null will probably be the room. However, if I remember correctly your system is setup as 'Both & LFE' for your mains and sub. You may have a cancellation issue there. Set all speakers to small to prove it's the room (then keep them as small :)). I think you'll find it will be the room.
    Just by moving you're sub a foot you may eliminate that 50Hz null.
    You'll never get the response perfectly flat, just make sure you don't have and massive peaks or nulls.
    My response is about +/- 6dB which is pretty good to say I used to have 20dB null at about 45Hz.

    You'll also probably find that your sub wont have any major volume output below 30Hz. Not many commercially available subs can.

    Good luck, this tweaking is the fun bit. :)
     
  6. mart.stokes

    mart.stokes
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    Yeah, tell me about the cancellations! This is the one problem with having two speakers producing the same frequency. But by disconnecting the sub I still have the null, by changing the phase of the sub the general bass is reinforced next to the sub (standing where I flick the switch) but the level lowers at the seating positions!

    I have opened a can of worms here. It is going to be SO much fun. I didn't have the SPL errors, many thanks again. :D
     
  7. Ramius

    Ramius
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    So, how much of a null are you talking??

    Once you get it sorted I guarantee you'll be pleased with the results.

    Cheers
     
  8. Gary Palmer

    Gary Palmer
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    Hi Ramius

    Where did you get these corrections from ?

    Gary
     
  9. Ramius

    Ramius
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  10. mart.stokes

    mart.stokes
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    An "uncorrected" drop from 78db at about 40hz (can't remember the exact frequency from the disk) to 64db at 50hz!!! Then the frequencies (all the way up to over 20khz) tend to waver between 74 to 78 (a few other serious drops and increases but these are outside the range for sub consideration). Without the sub powered on there is still over 70db at just before 50Hz. I thought at first that I was cutting the sub off too low but I whacked it up to 120hz and all that did was increase the levels between about 70Hz and 80hz (I'm splitting hairs now!).

    Wife is out on Saturday, could be LOTS of playing going on.
     
  11. Confucius

    Confucius
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  12. mart.stokes

    mart.stokes
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    Thanks Pete, SGHT is the American magazine I have made reference to in the past, very serious stuff and a good read (I think it was something like "the Home Theater Architect" column that started to blow my mind with all this bass stuff a few years ago). Just as an aside, it takes them forever to get a "roadtest" of equipment or a DVD disk to be printed in the magazine, the British mags are a lot faster.
     
  13. mart.stokes

    mart.stokes
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    Yup, just checked it out, Russ Herschelmann, Home Theater Architect. VERY VERY serious stuff, too rich for my blood.
     
  14. Confucius

    Confucius
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    Yeah, noticed that with 'Yankee' publications. I manage to get 'Home Theater' & 'SG.HT' at my local newsagent, I've yet to find a supplier for 'Widescreen Review' (my personal fave) yet.

    DVD reviews in the first 2 are about 2 or even 3 months out of date by the time I read 'em in the UK.
     

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