variance of +/- 10 Hz with 1 kHz test tone

Should I try another platter to see if my current factory Rega one is defective?

@Gvasale and @Atmasphere, what is the formula you are using for these calculations?

Ok, some new info here. I figured out why the Platter Speed app was not registering. I didn't realize that side 1 of the Clearaudio burn in LP is 45 rpm. Once I set the TTPSU to 45 rmp, the app registered the new data, which follows:

- speed varied between the -.2% slow mark and +.3% fast mark during the 1 kHz test in the first section on the first screen of the app
- unfiltered frequency varied between 1006 (with a few peaks at 1008) and 996 Hz over 35 seconds on the second screen of the app
- filtered frequency was almost completely flat at 1002 Hz over 35 seconds on the second screen of the app

So, if I'm reading this correctly, the filtered looked very good and it looks like my speed is fluctuating between 33.39 and 33.43 every second.

Much better?

Correction, speed is fluctuating between 33.27 and 33.43.

Here are some more app numbers from the 35 second sampling:

mean freq: 1001.3 Hz

raw freq
max deviation (relative): -2.76% / +.63%
max deviation (absolute): -27.6 Hz / +6.3 Hz

lowpass-filtered freq
max deviation (relative): -.16% / +.04%
max deviation (absolute): -1.6 Hz / +.4 Hz

What is the difference between the raw and lowpass-filtered frequencies? What is the net wow / flutter measurement of my table using this app?

Thanks everyone!

Second run of over 50 seconds was much better:

mean freq: 1001.4 Hz

raw freq
max deviation (relative): -.75% / +.68%
max deviation (absolute): -7.5 Hz / +6.8 Hz

lowpass-filtered freq
max deviation (relative): -.10% / +.05%
max deviation (absolute): -1.0 Hz / +.5 Hz

Yes, I am holding the phone. I will try it stationary next time.

Numbers are basically the same with the phone on the table. Lowpass filtered is:

-0.11% / +0.03%

Should I have the TTPSU checked by Rega as it is still under warranty? Or, could it be the test record?

The GT Reference RP6 subplatter I am using came with a much nicer bearing and spindle that rides on the bearing. It also came with lubricant that is not as thick as the Rega factory oil. Should I try the Rega factory oil? I could not find wow / flutter specs for this table in the US manual. Anyone know what they are for a RP6 with the TTPSU?

Some interesting reading here:

http://www.vinylengine.com/turntable_forum/viewtopic.php?f=32&t=65143

I still think i will be sending back my TTPSU for verification of settings to spec...

Ok, did some more tests today. Found some more things about the iphone app and the differences between the Rega white and black belts.

First, the iphone app. Sometimes if you let the test tone run out to the end of the record or lift the needle while the app is running it can cause a large frequency spike or dip, which throws off your overall numbers. I think this is why my numbers were weird (thanks @Tonywinsc for noting this) showing the table running a little fast but the negative deviation being the largest, which didn't make sense. All the graphs for these weird numbers showed a large dip at the end of the measurement session. Since there is no stop measurement button on the app, I've found changing the preamp input is the best way to stop the app without any spike or dip.

So, with the white belt and changing the input source on the preamp after a good sample duration, I got the following numbers:

overall freq: 1001.8 Hz

filtered deviation:
-0.02% / +0.08%
-0.2 Hz / +0.8 Hz

And with the black belt today, I got:

overall freq: 1000.6 Hz

filtered deviation:
-0.02% / +0.03%
-0.2 Hz / +0.3 Hz

So, after reading about other experiencing larger deviations with the white belt, it seems I am seeing the same thing plus it makes the table run faster.

I'm keeping the black belt on for now. I have a $20 red belt on order from the UK after reading good things about it. Will post those test results when I get it.

Anyone want to buy a Rega white belt with not many hours on it (about 6 months of average play)? ;)

Yes, nicely laid back with more definition between the notes plus a little more warmth.

I guess Rega took the shortcut with the white belt upgrade, like other turntable manufacturers (pro-ject), thinking a faster running table sounds better. I disagree...

Noticeable difference on solo piano. After reading more, it sounds like there
is some variance with belts and test numbers. So, finding a belt that
produces the test tone most accurately is the right one for me. Just got my
red belt in the mail. Have not tried it yet.

Tried a red belt from North Hill Audio (from ebay, cheaper than white belt, not affiliated). Good numbers initially:

mean freq: 1000.2 Hz

filtered freq:
-0.04% / +0.05%
-0.4 Hz / +0.5 Hz

Also tested my black belt which has posted the best numbers so far:

1002.9 Hz
-0.09% / +0.02%
-0.9 Hz / +0.2 Hz

It is a lot warmer today (by 20+ deg F) since I last ran these tests. Maybe the black belt stretched? Maybe it is more sensitive to temp? Will listen some to the red belt and re-test again. Both seem to be doing better than the factory white belt I got.

One more test run with the red belt:

1000.0 Hz
-0.05% / +0.04%
-0.5 Hz / +0.4 Hz

Went back to black belt. Bigger sound stage and more bass.