Old 01-08-2018, 10:03 AM   #1
bill0287
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Default How to compare 2 recorded signals

Hi. What I want to do is see what the difference is (sonically) between two recording signals "after" I replace a preamp tube in my guitar amplifier. How would I best go about doing that if I do a simple recording of each? What plugins or tools could I place in Reaper to see if there is a difference between the two samples? I hope that makes sense.

Thanks
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Old 01-08-2018, 12:39 PM   #2
Dynsdale
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Interesting; Ideally would want exactly the same guitar signal for both recordings. You could record a DI guitar signal, and play that back though your amp before and after. Or use a Loop pedal to feed the amp.
Use the spectral analyser; ReaEq; Voxengo's span to get a visual representation.
Or if you have exactly the same source material, invert the phase on one track and what you hear should be the difference between the tracks.
Have fun, good luck.
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Old 02-13-2018, 02:44 PM   #3
Philbo King
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Another possibility is a spectrum analyzer comparison. If the thing is adding harmonics, it should be easy to see, on single or double notes at least.
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Old 04-11-2018, 03:47 AM   #4
Winfield
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When I do something like this I use a looper pedal or reamp, so i can record the same perfomance twice - eg before and after a (tube) change. Get a 'good' perfomance with different playing styles - hanging notes, chords, palm mutes etc. Of course everything else (mic placement, volume etc.) must be the same.

ISOL8 is a great plugin to check (with your ears) which frequencies is affected
Get it here for free http://www.tb-software.com/TBProAudio/download.html. I prefer to have it on the 'monitor effects' in reaper.

-W
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Old 04-11-2018, 06:13 PM   #5
jerome_oneil
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Reamp it with the new tube. Record a sample dry. Use line out if you have it. Replace the tube. Run the first signal through the Reamp and record that output.
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Old 04-12-2018, 07:34 AM   #6
clepsydrae
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Once you have the audio recorded you can use the software in my sig to compare them. (Blind testing can be really useful in a situation like this.)
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Old 04-14-2018, 12:03 AM   #7
SwampDonkey
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http://www.pcjv.de/Applications/Meas...ginAnalyser.7z
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