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Thread: Helix DSP RTA ATF Reference curve

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    Helix DSP RTA ATF Reference curve

    Hi Guys, I was just wondering what your thoughts on the inbuilt curve of the helix dsp was, it seems to not get flat unit about 1.6 Khz and in the Helix magazine says this is industry standard yet most of the alternate house curves I have seen flatten off much earlier.

    Also for any one else using the dsp, does the umik-1 mic calibration file work out of the box, I can select it fine so I am assuming so.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Noob Jdunk54nl's Avatar
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    Re: Helix DSP RTA ATF Reference curve

    Not sure what you mean by umik 1 calibration out of the box. But that curve looks like a more general ~1db/octave roll off. It is one I would maybe use for a home system with air attenuation of the tweeter, but not one for a car.

    This is the one I use and really like it.

    20 10
    25 10
    31 10
    40 10
    50 10
    63 9
    80 6.5
    100 4.2
    125 2
    160 0
    200 0
    250 0
    315 0
    400 0
    500 0
    630 0
    800 0
    1000 0
    1200 0
    1600 0
    2000 -1.5
    2500 -3
    3100 -3
    4000 -1.5
    5000 0
    6300 0
    8000 0
    10000 0
    12000 0
    16000 0
    20000 0


    Click image for larger version. 

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    2014 F150 Limited -> Kenwood DDX-9907xr -> Helix DSP.2 -> Alpine PDX-V9 -> SI M25 mki in Valicar Stuttgart Pods, Rear SB17's, Sub SI BM MKV's in MTI BOX. Alpine PDX-F6 -> SI Tm65 mkIV, SI M3 mkI in Valicar Stuttgart Pods

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Helix DSP RTA ATF Reference curve

    Quote Originally Posted by Crusher View Post
    .... and in the Helix magazine says this is industry standard .....
    That's the great thing about standards, there are so many to choose from!
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
    Do it for them.

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    Owner BigAl205's Avatar
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    Re: Helix DSP RTA ATF Reference curve

    Quote Originally Posted by Justin Zazzi View Post
    That's the great thing about standards, there are so many to choose from!
    You're unique...just like everybody else

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    Noob Savackz's Avatar
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    Re: Helix DSP RTA ATF Reference curve

    Quote Originally Posted by Jdunk54nl View Post
    Not sure what you mean by umik 1 calibration out of the box. But that curve looks like a more general ~1db/octave roll off. It is one I would maybe use for a home system with air attenuation of the tweeter, but not one for a car.

    This is the one I use and really like it.

    20 10
    25 10
    31 10
    40 10
    50 10
    63 9
    80 6.5
    100 4.2
    125 2
    160 0
    200 0
    250 0
    315 0
    400 0
    500 0
    630 0
    800 0
    1000 0
    1200 0
    1600 0
    2000 -1.5
    2500 -3
    3100 -3
    4000 -1.5
    5000 0
    6300 0
    8000 0
    10000 0
    12000 0
    16000 0
    20000 0


    Click image for larger version. 

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ID:	17289
    I adjusted my JBL Curve to have that same dip around 2.5-3k. It’s awful.

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    Wave Shepherd - aka Jazzi Justin Zazzi's Avatar
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    Re: Helix DSP RTA ATF Reference curve

    It's awful before, or it awful after?
    Asking for a friend.
    Measure with mics, mark with chalk, cut with torch, grind to fit, sand to finish, paint to match.
    Updated Justin tuning sheet (Justin and Erica tuning companion for SMAART and REW)
    Do it for them.

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    Noob Stycker's Avatar
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    Re: Helix DSP RTA ATF Reference curve

    Thats funny stuff right there

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    Re: Helix DSP RTA ATF Reference curve

    With regards to the uik calibration file, what I meant was is the file as downloaded from minidsp compatible with the helix software?

    Funily enough I have that dip at 3k without trying, well until I point the tweeters at my head.

    Many thanks

  9. Back To Top    #9

    Re: Helix DSP RTA ATF Reference curve

    Audiotec fischer when talking about the new dsp 5 tool explained the reason for not going flat in their custom atf house curve until higher up in the freq range was down to the road noise in most cars destroying the sound in those areas.

    The auto parametric eq looks good. HELIX | CAR AUDIO | SHOWCASE video on you tube.


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