Cheapest way to decent RTA? (preferably portable)

Discussion in 'Archived Threads 2001-2004' started by Mike Dr, Apr 14, 2002.

  1. Mike Dr

    Mike Dr Stunt Coordinator

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    Software is expensive, standalone RTA's are even more .. I dont mind DIY work, I dont mind soldering .. and if there's a design out there that works well enough I might even come up with a kit for others to buy (i can prototype PC Boards).. so the question is.. what is the most cost-effective RTA out there...

    standalone would be great, but probably not feasable .. something with software is probably the answer, but software has to be able to calibrate well and deal with crappy (i.e. laptop) sound cards

    thanks
     
  2. Ellen

    Ellen Stunt Coordinator

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    Ellen
    Don't know about hardware solutions but True Audio's TrueRTA might be a good solution. Comes in several different levels. Pay for only the level you need. I believe that the next version of the program will accept mic calibration files.
    In addition, the demo version of the loudspeaker and audio measurement software Praxis from Liberty Instruments includes an RTA.
     
  3. ThomasW

    ThomasW Cinematographer

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    Ellen's correct, the TrueAudio, TrueRTA is a VERY good little program. If you have the bucks, pop for the 1/24 octave version, it gives a lot more info.
     
  4. Mike Dr

    Mike Dr Stunt Coordinator

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    Ok, trueRTA does sound like a pretty inexpensive program.. no what about mics? How does it calibrate for different mics?
     
  5. Mike Dr

    Mike Dr Stunt Coordinator

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    Ok I just looked at the list of recommended mic's and preamps on trurta's site and all the pre-amps are stationary. I want something I'd be able to use in the car with a laptop as well - any recommendations?
     
  6. ThomasW

    ThomasW Cinematographer

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    Mike

    Check the FAQ page on the TrueAudio site. He's got some fairly low buck recommendations as well
     
  7. Mike Dr

    Mike Dr Stunt Coordinator

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    Thomas, check my reply just above your comment
     
  8. ThomasW

    ThomasW Cinematographer

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  9. Mike Dr

    Mike Dr Stunt Coordinator

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    The problem for me is that I would want to use this for my car as well
     
  10. Marv

    Marv Stunt Coordinator

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    Has anyone tried to use the Radio Shack SPL meter as the mic? It's portable although probably not flat enough for full range testing.

    -Marv

    P.S. Thomas I'm still working on getting a digicam for my IB picts.
     
  11. Mike Dr

    Mike Dr Stunt Coordinator

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    yeah that's what I've been using since correction curves are widely available. I still dont know exactly what to set it to to get proper reading.. i've been setting it to 100db, C weighted ..
     
  12. ThomasW

    ThomasW Cinematographer

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    Mike
    There are a couple of ways to go if you need battery power. The easiest is getting an AudioControl MP-200 Battery powered 9 volt operation only $349+ shipping [​IMG]
    The other is getting one of the DIY mics that use the panasonic cart. And building a battery operated pre-amp.
    BTW the MP-200 (I have one) has no better mic than the $30 Behringer ECM8000. The down side to the ECM8000 is the need for 48+ volts phantom power. Battery powered mic pre-amps with phantom power are $300+
    Of course if you can run and extension cord out the window or are willing to use a battery powered inverter. You can get the Behringer DSP110 for $70. combine that with the ECM8000 $30, and you'd have a pretty nice measurement system for cheap.
     

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