That is a excellent idea. Do a sine wave sweep as well to check for resonance and bad voice coils.
Better to do a gated measurement sweep as that will exclude the room from your measurements, capturing just the speaker. Requires sufficient distance between speaker and walls.
This works well for sine wave sweeps. It does require a internet connection. If you look about online you might find a executable sine wave generator software that does not require a internet connection.
You do a regular measurement sweep, then apply gating to it according to the guide I sent you.
Doodski, are you thinking just play a sweep and listen for resonances, snaps, crackles, and pops?This works well for sine wave sweeps. It does require a internet connection. If you look about online you might find a executable sine wave generator software that does not require a internet connection.
When providing warranty service for KEF and Energy for several years I found that frequency sweeping slowly up and down finds issues like failing voice coils, woofer surround adhesives failing and the braided wires leading into the voice coil having bad solder or being intermittent much better than music does.
I do like listening to sweeps to listen for resonances, rubbing things, broken stuff, unsecured wires, or lost items that have fallen into ports. For instance, I just have a woofer that had a surround that wasn't glued properly:That works too...lol. I have never used/installed REW so I was not aware of that feature.
www.audiosciencereview.com
Sweeps are fun stuff. I always expected to find something because the inexpensive and even expensive cabinets have issues, the woofers like you showed there have issues and the screws holding them fastened to the cabinet can be even be loose and one would never know without a sweep. Tweeters usually are good or bad I found. Sweeping them was not very productive but woofers and cabinets... yes, they are often bad.
I checked out post #9 that you linked me to. Very nice troubleshooting/systematic fault finding.I do like listening to sweeps to listen for resonances, rubbing things, broken stuff, unsecured wires, or lost items that have fallen into ports. For instance, I just have a woofer that had a surround that wasn't glued properly:
I could hear it in the built speaker but couldn't localize what was wrong with the driver, and the surround really laid flat while I inspected it so I didn't see that half the glue was missing from the surround. But gosh could I hear it during a sweep, the surround's floppiness would modulate as the frequency was swept drew my attention directly to the problem. I'm a little embarrassed it took me so long to trace.Active DSP DIY speakers, for testing a few ideas
FFLOTSAM (Fabricated From LeftOver Things Studio Active Monitor) Active DSP speakers, for testing a few ideas I had some stuff lying around; a few random Baltic Birch-ply panels, some countertop material, a few cans of partially used brown spray paint, and some not-too clumpy spar varnish (that...
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If you read the post, you will see the unglued surround barely showed up in the frequency response traces compared to the good driver! You had to compare distortion, which had peaks at all of the frequencies where the surround started burping. I guess my point is, I like sweeps and feel it's one of the few audible diagnostics where I trust my hearing.
When providing warranty service for KEF and Energy for several years I found that frequency sweeping slowly up and down finds issues like failing voice coils, woofer surround adhesives failing and the braided wires leading into the voice coil having bad solder or being intermittent much better than music does.
Agreed, music is just a bad diagnostic, especially for broken things. It does little to excite specific resonances, and you have to hunt among the whole signal for the response you are interested in. So you can't see the forest for the trees, and you have done nothing to enhance the contrast of what you are actually trying to look for. And our ears are desperate for contrast. If you do find something, you typically have a difficult time then tracing what it is.When providing warranty service for KEF and Energy for several years I found that frequency sweeping slowly up and down finds issues like failing voice coils, woofer surround adhesives failing and the braided wires leading into the voice coil having bad solder or being intermittent much better than music does.
Because they are used. OP is right to be paranoid.Not sure why you'd expect any of that on a random pair of used Revels though, but why not.
Lol... You have a good point although after 15 years of diagnosing and repairing and some of those years comprised of an average of 72 hour and 74 hour work weeks I can easily say I am tainted and conditioned to trust nothing. Nearly everything I saw for that period of time was broken, defective or fried. So I have a strong distrust of anything that I would be checking out even if new or in the case of a fine speaker like a Revel.Not sure why you'd expect any of that on a random pair of used Revels though, but why not.
