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Thread: FYI for mic/pres plugged into Audio interfaces that have Built in Mic-pres.

  1. #11
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    Feb 2003
    Augusta, Ga.
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    Quote Originally Posted by ecc83 View Post
    That RME preamp is rubbish unless modified in a secret way known only to ME! PM me IMMEDIATELY and I will pay shipping plus a nifty for your trouble.....

    Heh! Does his dad's friend KNOW he has it? Over 1/2 a bag's worth of kit in the hands of noobs!

    LOL,, I'm sure he does. Or he may not as well. They all have ties to James Brown in some type of way. Could have been
    Jame's engineer or something. That's highly possible here. We all are from Augusta Ga. He doesn't know what he has though. I even saw a old
    Studer 24 track recorder. LOL
    Strap it Cross Dat Stereo Buss !!

  2. #12
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    Quote Originally Posted by View Post
    You have a link to what you were reading?
    the use of it as a pad was told on the forum here. back when I was running a ISA One into a Tascam Frontier USB (their first usb unit the silver with blue rubber on it! lol funny looking)

    the weakest link comment was on another forum in a high end section. I usually dont doubt those guys hearing more in a room thats tweaked and near perfect, but can HR hear the tiny subtle differences? I dont know. Makes sense in theory too. Weakest Link theory.

    if it's not happening in the room, it ain't gonna happen on tape.-H.Gerst

  3. #13
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    There's two truths in this problem.

    If you have average gear that has a true line input, use it.

    BUT better gear, and any recent gear that follows the electronics handbook, has a mic input that is also the line input. That's because these mic preamps have such a wide gain range, that you can use them as a line input, simply by reducing the gain.

    The only thing that might not be ideal, is the impedance. But the days of impedance matching have long gone. Your typical mic preamp has a 2 to 5 kOhm impedance at the input. A "true" line imput should be 10 to 100 kOhm. But modern gear doesn't care, so it really is a moot point.

    If you're running real vintage tube stuff, it becomes a real problem, technically. But that's just the kind of stuff they do, those who own the real vintage stuff. To add colour, warmth, depth, or whatever they like to hear in harmonic distortion.

    A way to check in the specs if the gear you're eying works well with a combined line/mic input, is to check the overall gain. Anything below 60 dB gain will be mediocre. Anything above should work.

    If we take the example of an RME interface, it has 80 dB overall gain. In theory, the output would produce 10 V from a 1 mV input at full gain. Of course, the output can do 10 V, but the following input might not be able to take that without a bit of distortion. It's just spare gain, for those mics that don't even reach 1 mV. At 0 dB gain, there's a number that's not often in the specs. It's the minimal gain. In this example, it's 20 dB. Eg, a 1V at the input still results in 10V at the output.

    It's also why good gear has a headroom of at least 20 dB over 0 dB;

    Where do you encounter the problem? Any battery fed recorders. Except stuff like Sound Devices etc.

    Because the mic inputs run on low voltage, low current, the design isn't by the book. And these usually distort a lot a 1V, 0 dB input. The better ones have line inputs, unfortunately often it's just a -40 dB pad, which adds a litlle noise.

    There are a real 32 bit interfaces. >15.000 , sans options. These don't even need to adjust gain. Their range is so big it doesn't matter if the signal is 1V or 1 mV.

    To us, mere mortals with a mortgage, RME with it's digital gain is the closest we can get to 32 bit heaven. It's only 24 bit, but with a true digital gain. 0,5 dB is precisely 0,5 dB. Every time, not dependent on mains power or moon phase.
    MB Pro, FF400, MKH816, AKG C451-C1/CK8, NT1, B5, MD21, Korg RC168, DEQ830, ADA8000...

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  5. #14
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    I am kinda wondering about the "M-audio".
    Win 7 Ult Dell i7 4core 6700ghz 32 GB, 1,2x2, 4 Tb Barracuda HD's running Pro tools 2018 through Allen&Heath Qu-32

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