elif Posted December 12, 2021 Share Posted December 12, 2021 What is a high-quality way to record a loudspeaker voice coil voltage? I'm doing a project in which I will be using ARTA to measure the impulse response of a loudspeaker in different in different acoustic environments. The speaker will be driven with 20 W or less, probably by a class-D amplifier with non-grounded outputs. I'll be using the loudspeaker driving voltage for the reference signal. The plan is to use a Focusrite Scarlett 2i4 (gen 1) for both the amp source and mic' input, and record with cardiod and blumlein microphone techniques. Is there a high-quality active or passive DI that can convert a non-grounded voice-coil signal to a balanced line livel?Could I use a simple balanced attentuator, maybe 10 kohm, to tap the voice coil and drive and XLR input directly?Can I rely the anti-aliasing filter of the recording device to filter any class-D out-of-band artifacts before the conversion process? TIA, -- bradley Quote Link to comment Share on other sites More sharing options...
KuruPrionz Posted December 13, 2021 Share Posted December 13, 2021 https://peavey.com/PDFs/Chapter3.pdf Page 7, The Damping Factor, second paragraph. You may already know this or you may find it interesting. It will have an effect on your measurements. Quote It took a chunk of my life to get here and I am still not sure where "here" is. Link to comment Share on other sites More sharing options...
elif Posted January 14, 2022 Author Share Posted January 14, 2022 Based on this schematic (pdf) for a voice-coil line out, I bought a Jensen JT-11-FL transformer and a 1590B enclosure to house it. This will provide the reference signal for the impulse response measurement. -- bradley Quote Link to comment Share on other sites More sharing options...
KuruPrionz Posted January 14, 2022 Share Posted January 14, 2022 Based on this schematic (pdf) for a voice-coil line out, I bought a Jensen JT-11-FL transformer and a 1590B enclosure to house it. This will provide the reference signal for the impulse response measurement. -- bradley Looks like a fairly simple build too. Even a not very technical person (like me!!!) could probably figure out how to put that together. This is an interesting project! Quote It took a chunk of my life to get here and I am still not sure where "here" is. Link to comment Share on other sites More sharing options...
elif Posted January 14, 2022 Author Share Posted January 14, 2022 The project is to measure a set of impulse responses for a Leslie speaker. I measured a set in the 90s using an HP 3562A Dynamic Signal Analyzer. Those impulses were used for a software simulation of what was essentially a close mic'ed Leslie. I now want to load a new set of impulses into the simulation captured using a standard stereo mic'ing technique for L & R. I am hoping it will give a more realistic Leslie-in-the-room presentation. Quote Link to comment Share on other sites More sharing options...
KuruPrionz Posted January 14, 2022 Share Posted January 14, 2022 The project is to measure a set of impulse responses for a Leslie speaker. I measured a set in the 90s using an HP 3562A Dynamic Signal Analyzer. Those impulses were used for a software simulation of what was essentially a close mic'ed Leslie. I now want to load a new set of impulses into the simulation captured using a standard stereo mic'ing technique for L & R. I am hoping it will give a more realistic Leslie-in-the-room presentation. That is quite the project!!! I do love the sound of a Leslie speaker although I found them challenging way back when I was doing live sound. One of the bands I used to work sound for had one. At the same time, one of my favorite sonic memories is of playing an electric 12 string guitar while sitting on top of a huge Leslie speaker. I was playing through the speaker and it was swirling all around me, lush and awesome. Quote It took a chunk of my life to get here and I am still not sure where "here" is. Link to comment Share on other sites More sharing options...
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