Do It Yourself - DIY

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  • How to: Measure with REW for Room EQ

    How to: Measure with REW for Room EQ

    REW is a powerful tool, as is EQ, but getting it right can be challenging. The first step to achieving a good EQ profile for your space is to take in-room measurements. This document will detail an easy method to achieve quick and reliable results.

    For room EQ, a single measurement at your listening location will not produce a good depiction of the overall room response. An average of many measurements around the listening area should be completed to create a room response for equalization...
    Go to post
    Last edited by Reet; 16 April 2023, 14:04 Sunday.

  • Minimum Phase and Accurate Crossover Simulation

    Minimum Phase and Accurate Crossover Simulation

    Minimum phase for a speaker can be described of the phase of the frequency response of the speaker at it’s acoustic centre, or the phase without any excess phase or “time of flight” included. It can be calculated from the speaker’s frequency response using Hilbert-bode transform, or HBT. When comparing multiple minimum phase responses, we can say that the responses occur at the same point in space, ie. there is no physical distance between them. When measuring speakers and processing the...
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    Last edited by Reet; 29 December 2022, 15:11 Thursday.

  • How To: VituixCAD Extended Impedance Model For Any Driver

    How To: VituixCAD Extended Impedance Model For Any Driver

    Loudspeaker T/S often includes only a single Le value for inductance, however driver motors are usually much more complex than a single coil of wire, so Le on its own is not a very good description of the driver characteristics. An extended impedance model, or “semi-inductance” model can provide additional characterization of the impedance curve for greater accuracy.

    Many Scan-Speak drivers include this data in the “advanced parameters” section of their datasheets, however the...
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    Last edited by Reet; 29 December 2022, 15:12 Thursday.

  • How To: Measuring impedance and T/S with ARTA/LIMP

    How To: Measuring impedance and T/S with ARTA/LIMP

    With a simple jig, loudspeaker impedance and T/S parameters can be easily measured with LIMP. The same jig may also be used to measure component value for resistors, capacitors, and inductors, as well as measure transfer functions of passive and active filters.

    The setup is quite simple, the following diagram is taken from the LIMP manual:
    https://artalabs.hr/download/LIMP-user-manual.pdf
    Measurement Jig



    This instruction is following what...
    Go to post
    Last edited by Reet; 29 December 2022, 15:12 Thursday.

  • How To: Mirror EQ with VituixCAD

    How To: Mirror EQ with VituixCAD

    With VituixCAD, we have the ability to provide a mirror EQ function, that can then be passed to APO EQ for active processing. This allows for a speaker's frequency response to be fully compensated for without requiring many bands of parametric EQ.

    ​VituixCAD Process
    Connect each driver and EQ blocks in the crossover section as shown. Ensure that the active peak/notch filters are “shorted” so that only the G(f) block is directly connected to the driver. Three PEQ blocks are show,...
    Go to post
    Last edited by Reet; 29 December 2022, 15:12 Thursday.

  • How To: Filter Simulation with VituixCAD and EQ APO

    How To: Filter Simulation with VituixCAD and EQ APO

    With meticulous passive filter design, it may be beneficial to hear the result before spending money on crossover parts and putting in the time to assemble the crossover. Fortunately, with VituixCAD and EQ APO and filter can be simulated digitally. This process can simulate multiple drivers simultaneously, one driver for each output on a soundcard, for example a 7.1 soundcard could simulate a stereo 3 way system utilizing 6 channels.

    Note that an emulated passive filter will reproduce...
    Go to post
    Last edited by Reet; 29 December 2022, 15:13 Thursday.

  • Dual Channel Measurement Jig

    Dual Channel Measurement Jig

    Here's a schematic for a simple dual channel measurement jig, which can be used with ARTA, REW, or SoundEasy. This jig is made with USB audio interfaces in mind, so the use of 1/4" TRS connectors is recommended for this purpose. Main reason is that the 48V phantom power on audio interfaces is only present on the XLR pins, so use of TRS will ensure that 48V will only ever be present when a mic is connected, not when using this jig even if you leave phantom power turned on.

    R1 should...
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  • Single vs Dual Channel Measurements, or why friends don’t let friend use USB mics

    Single vs Dual Channel Measurements, or why friends don’t let friend use USB mics

    What does single channel or dual channel measurement really mean, and what are the implications of choosing one over the other? This document aims to help answer this.
    Strictly speaking, a microphone is a single channel of audio input, in that it is a mono signal. USB microphones which include integrated ADC and USB codec can be considered a single channel device.

    Dual channel would be a measurement which includes a second channel of signal input in addition to the microphone....
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    Last edited by Reet; 26 December 2022, 14:49 Monday.

  • How To: Export Impulse Response from REW for use in VituixCAD (prior to 2.0.98.6)

    How To: Export Impulse Response from REW for use in VituixCAD (prior to 2.0.98.6)

    Update: Since VituixCAD 2.0.98.6, exporting IR using windowing as described here is no longer required. the impulse response can be exported directly, make sure to uncheck "normalize" on export. VituixCAD will automatically set "skip samples" to 1m (2.907ms) prior to the start time of the exported impulse response to maintain correct timing on import.

    REW can export the measured impulse response directly as MLSSA formatted text file, which can be used within the...
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    Last edited by Reet; 14 January 2023, 17:06 Saturday.

  • Noobster build with Piano Black How To

    Noobster build with Piano Black How To

    For the piano black finish.....get ready. This is quite a bit of work. Made MUCH easier with the right tools...but is a bit of bear regardless. Total time took over a month for me including all my orders/lessons learned/and actual finishing. With a second go-round, I bet I could do it over 3-4 weeks only working on weekends. Biggest part is drying time. Figure a day for final sanding/polishing/installing components for the pair.

    I tried to do it the poor man's way, but it was exhausting...
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    Last edited by theSven; 29 April 2023, 06:51 Saturday. Reason: Update image location
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  • How to: Measure with REW for Room EQ
    by Reet
    REW is a powerful tool, as is EQ, but getting it right can be challenging. The first step to achieving a good EQ profile for your space is to take in-room measurements. This document will detail an easy method to achieve quick and reliable results.

    For room EQ, a single measurement at your listening location will not produce a good depiction of the overall room response. An average of many measurements around the listening area should be completed to create a room response for equalization...
    12 April 2023, 11:42 Wednesday
  • Minimum Phase and Accurate Crossover Simulation
    by Reet
    Minimum phase for a speaker can be described of the phase of the frequency response of the speaker at it’s acoustic centre, or the phase without any excess phase or “time of flight” included. It can be calculated from the speaker’s frequency response using Hilbert-bode transform, or HBT. When comparing multiple minimum phase responses, we can say that the responses occur at the same point in space, ie. there is no physical distance between them. When measuring speakers and processing the...
    26 December 2022, 15:27 Monday
  • How To: VituixCAD Extended Impedance Model For Any Driver
    by Reet
    Loudspeaker T/S often includes only a single Le value for inductance, however driver motors are usually much more complex than a single coil of wire, so Le on its own is not a very good description of the driver characteristics. An extended impedance model, or “semi-inductance” model can provide additional characterization of the impedance curve for greater accuracy.

    Many Scan-Speak drivers include this data in the “advanced parameters” section of their datasheets, however the...
    26 December 2022, 15:07 Monday
  • How To: Measuring impedance and T/S with ARTA/LIMP
    by Reet
    With a simple jig, loudspeaker impedance and T/S parameters can be easily measured with LIMP. The same jig may also be used to measure component value for resistors, capacitors, and inductors, as well as measure transfer functions of passive and active filters.

    The setup is quite simple, the following diagram is taken from the LIMP manual:
    https://artalabs.hr/download/LIMP-user-manual.pdf
    Measurement Jig



    This instruction is following what...
    26 December 2022, 15:02 Monday
  • How To: Mirror EQ with VituixCAD
    by Reet
    With VituixCAD, we have the ability to provide a mirror EQ function, that can then be passed to APO EQ for active processing. This allows for a speaker's frequency response to be fully compensated for without requiring many bands of parametric EQ.

    ​VituixCAD Process
    Connect each driver and EQ blocks in the crossover section as shown. Ensure that the active peak/notch filters are “shorted” so that only the G(f) block is directly connected to the driver. Three PEQ blocks are show,...
    26 December 2022, 13:26 Monday
  • How To: Filter Simulation with VituixCAD and EQ APO
    by Reet
    With meticulous passive filter design, it may be beneficial to hear the result before spending money on crossover parts and putting in the time to assemble the crossover. Fortunately, with VituixCAD and EQ APO and filter can be simulated digitally. This process can simulate multiple drivers simultaneously, one driver for each output on a soundcard, for example a 7.1 soundcard could simulate a stereo 3 way system utilizing 6 channels.

    Note that an emulated passive filter will reproduce...
    26 December 2022, 12:55 Monday
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