RPM Speed Test
- Thread starter Dan ʕ•ᴥ•ʔ
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That's an amazing result. Are you running the original belt?
Blue Shadow
Waiting for Vintage Gear from this century
There are a couple threads about this. Not with lots of folks posting but this topic shows up and some folks post.
Fun with some turntable speed tests | Audiokarma Home Audio Stereo Discussion Forums
Wow high. Can RPM app be trusted? | Audiokarma Home Audio Stereo Discussion Forums
Always interesting to see how different tables do in these tests.
Dan ʕ•ᴥ•ʔ
Peanut Head
I was, but it's nearly ten years old and I wasn't happy with the Speed Test results. What's shown is with a new belt in place.
Here's what I got recently on my 80's era rega planar 3 with original resin sub platter, regular black belt, upgraded brass pulley, and upgraded motor thrust bearing.
Not too shabby.
This is why I take all those complaints about rega speed issues with a grain of salt.
This is using a different app than the OP.
It's called Turntable Speed by Snakerule. I like this one better than the others I've used 'cus I can save the name and results to make comparisons over time.
Not too shabby.This is why I take all those complaints about rega speed issues with a grain of salt.
This is using a different app than the OP.
It's called Turntable Speed by Snakerule. I like this one better than the others I've used 'cus I can save the name and results to make comparisons over time.
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grillebilly
Empty Head
I used a stopwatch and a strip of paper and did it the old school way.
adnick
Addicted Member
Very nice table….
Paragould hey, very nice town, and the only one by that name…went to high school at Greene County Tech.
VR
Andy
tnsilver
Stereo Puppy
Proly the only reliable measurement in this thread and threads like this.
flavio81
Turntable technician
My comments:
1. The app doesn't measure flutter, so the figures above are for wow, really
2. You don't specify if you're used the RMS value or the 2-sigma value. A 0.04% wow 2-sigma figure would mean an outstanding belt drive turntable.
3. The app is very tricky because it requires you to place a heavy unbalanced object (the cellphone) on the platter. Thus it will measure nice on turntables with massive platters and/or strong motors and/or servo control (like most DD tables), and bad on turntables that don't have any of those features.
This hasn't been my experience. If I center the phone over the spindle it gives a very low wow reading on my light-platter DP-15F.
cafe latte
Addicted Member
The rpm app tests for wow and flutter are not even close to accurate.
Chris
flavio81
Turntable technician
As i mentioned: "Thus it will measure nice on turntables with massive platters and/or strong motors and/or servo control (like most DD tables), and bad on turntables that don't have any of those features."
The Denon DP-15F is a servo-controlled quartz-locked DD table. The off-center mass of the cellphone can't produce wow on the DP-15F because the servo system iwill correct the speed at least 100 times per revolution.
I certainly hope they measure 3x the original spec.
cafe latte
Addicted Member
The point is you are not measuring wow and flutter of a rotating record on your platter. If a record has for example an off centre hole then you get wow, the same apples if the bearing has play or the platter is warped, non of these things will affect the app. We dont know where the gyro is in the phone as already mentioned so we cant centre it on the record and unless your phone is round with a hole in it it is impossible to get it balanced anyway. The apps are a bit of fun, you can get a reading and compare it to after changing a belt and get another reading, these are not the real value not even close but you will maybe see the change has done something that is the best the app can do.
Chris
cafe latte
Addicted Member
see my other post
