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    MixPre II recorders- 32bit float, internal TC generator, lotso dynamic range
    #1
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    Just got the email announcement. Apparently shipping now. Looks like lower prices, too.

    More info:
    https://www.sounddevices.com/mixpre/

    mixpreII.jpg
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    Jim Feeley
    POV Media


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    Sound Ninja Noiz2's Avatar
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    $650, $850, $1,400

    Looks like SD has been looking at Zoom.
    Cheers
    SK


    Scott Koue
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    Noiz on Noise


    ďIt ainít ignorance that causes all the troubles in this world, itís the things that people know that ainít soĒ

    Edwin Howard Armstrong
    creator of modern radio


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    BTW SD has a paper that does a good job of explaining the differences between 16 bit, 24 bit, and 32 bit float.
    https://www.sounddevices.com/32-bit-...les-explained/

    I thought I knew the difference but turns out I was wrong!

    The big takeaway is
    16 bit fixed has -96 dB of space below zero. 96dB dynamic range
    24 bit fixed has -144 dB of space below zero. 144dB dynamic range
    32 bit float has -758 dB of space below zero AND +770 dB space above zero. 1,528dB dynamic range

    Which is why level selling is not really an issue.
    Cheers
    SK


    Scott Koue
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    Noiz on Noise


    ďIt ainít ignorance that causes all the troubles in this world, itís the things that people know that ainít soĒ

    Edwin Howard Armstrong
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    Senior Member Cary Knoop's Avatar
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    Quote Originally Posted by Noiz2 View Post
    BTW SD has a paper that does a good job of explaining the differences between 16 bit, 24 bit, and 32 bit float.
    https://www.sounddevices.com/32-bit-...les-explained/

    I thought I knew the difference but turns out I was wrong!

    The big takeaway is
    16 bit fixed has -96 dB of space below zero. 96dB dynamic range
    24 bit fixed has -144 dB of space below zero. 144dB dynamic range
    32 bit float has -758 dB of space below zero AND +770 dB space above zero. 1,528dB dynamic range

    Which is why level selling is not really an issue.
    It's great to have float32 but remember that the dynamic range is not limited by the calculation and encoding format it is limited by the quality of the AD converters.


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    #5
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    SD asked me why I was pushing float recording when talking to them about MixPre6 issues, apparently the response was effective* ;)


    * j/k- they were probably already working on it and wanted market confirmation. All this stuff is pretty obvious: unclippable float is a winning design (a kind of RAW audio). Hopefully they've fixed all the other issues I found too


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    Senior Member Eric Coughlin's Avatar
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    Anybody know what's new with the new ones? I can't find any articles describing the updates.

    I was hoping they would have found a way to fit an XLR and BNC output into the 3 and 6, but that's still reserved for the 10 which is a bit large and with way more inputs than I'd ever need. While I'm not thrilled with my Mix Pre 3, I do really like how I can throw it in a small compartment in my camera bag and hardly notice it's there in terms of size and weight it takes up, especially considering I don't use it often.


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    #7
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    Quote Originally Posted by Eric Coughlin View Post
    Anybody know what's new with the new ones?
    Whatís New in the MixPre-6 II ?

    - Bit depth up to 32-bit float for increased dynamic range.
    - Same intuitive interface, more powerful hardware.
    - Internal LTC Timecode Generation and Output.
    - Adjustable Limiters.
    - Auto-copy to USB Drive.
    - Pre-roll buffer increased to 10 seconds.

    SD MixPre-6 II Web Page


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    Sound Ninja Noiz2's Avatar
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    Quote Originally Posted by Cary Knoop View Post
    It's great to have float32 but remember that the dynamic range is not limited by the calculation and encoding format it is limited by the quality of the AD converters.
    True but the dynamic range of life is a bit over 200dB so the point basically was that you need only a small fraction of what is available with 32bit float so wherever you record the encoding will not clip out on you. SD already has really good A/D converters and mic preamps, what this changes is that instead of trying to optimize your levels to get the most out of the encoding bandwidth you don't need to because the bandwidth available is over three times what you can ever use. In practice 32 bit float shouldn't give you much more bandwidth than an optimized 24bit fixed setup but the the 32bit setup gives you an extra 770 dB or so of headroom. As long as you don't clip the microphone or the preamp you are not going to clip no mater what. Also if you record really low you can bring the level back up after the fact with out the low bit garbage that you would get with 24 fixed because your bit rate doesn't shrink when you record below where you should.

    It's not a magic bullet and crappy recordings will still be crappy recordings but for production work and SFX and really any live recording this could be a BIG help when you get "suprise" levels.

    My guess is that it will be a boon for C to B+ recordings, once you get below a C there will be plenty of other issues and your A recordings are still going to be A's. But that A recording where the star decided it might be fun to scream for some reason will stay A recordings instead of becoming an A recording with an F moment.
    Cheers
    SK


    Scott Koue
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    Noiz on Noise


    ďIt ainít ignorance that causes all the troubles in this world, itís the things that people know that ainít soĒ

    Edwin Howard Armstrong
    creator of modern radio


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    #9
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    But will it record the plutonium rock band Disaster Area without clipping? Also, wouldn't the SPL of microphones be the limiting factor?


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    Quote Originally Posted by Kevin Kelly View Post
    But will it record the plutonium rock band Disaster Area without clipping? Also, wouldn't the SPL of microphones be the limiting factor?
    With 1,528 dB of dynamic range you could probably record the sun going super-nova before everything evaporates.


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