How accurate is the RPM Wow and Flutter app?

[Mark 1234]

Also, check what the arm is doing, Vertical vibration can also sound like flutter. Is it vibrating on warps?

I first tried my other arm with another cartridge and then switched to a solid state setup. Same issue. It was the turntable. Playing perfect now.

 

[Mark 1234]

Update. New caps and a clean with deox fixed problem.
The DP80 is one fine piece of machinery.

 

[cafe latte]

part of the limit of the app's accuracy is the fact that cell phones are bar-shaped instead of round, so even if you have means of balancing the phone on the spindle as it spins, you're going to induce a slight wow effect just by rotating that phone with the platter. if you're just setting it directly on the platter, it's going to be worse (i've observed this directly). direct drives probably won't care as much, but a belt drive with a lightly or moderately weighted platter will most definitely see that extra unbalanced mass swinging around and you won't get an accurate result...

generally speaking (as a former physics lab TA), i would say the app is "precise" in that it can give very similar results (via the speed vs. time graph) every time that you set your phone and the table up the same, but it's "accurate." on two different phones with the same table, the result varied by like 20% (but the shape of the speed curves was the same).

sl1200G needs a balanced platter putting a phone on the platter will cause all sorts of problems. The MK2 is more resistant to off balance, but point is DD have just as much of a problem with something like a phone on the platter as any other turntable.
Chris

 

[T68]

When I get good readings like this I of course regard the app being very accurate .

50 year old Lenco L75 with stock idler and platter bearing:

 

[theclipper]

Has anyone used the iOS RPM app to measure the wow/flutter on a Rega P8? I haven't been able to get a value lower than .17% - which seems kind of high for a higher end Rega. I'm trying to figure out if there is potentially an issue with my table not spinning true, or if it's just a limitation of the app.

Thanks!

 

[MRL_Audio]

I don't bother with stuff like this... too busy playing music and enjoying the collection.

 

[warrjon]

How accurate is the app - I was surprised at how accurate it is. This was done on my SP10mk2 Platinum with the phone in the center of the platter, I have a secondary spindle that can be removed, so the phone was in the middle of the platter. The app corresponds to the peak W&F measured by Virtins MI.

This is W&F measured from the motor feedback signal



The app

 

[warrjon]

Has anyone used the iOS RPM app to measure the wow/flutter on a Rega P8? I haven't been able to get a value lower than .17% - which seems kind of high for a higher end Rega. I'm trying to figure out if there is potentially an issue with my table not spinning true, or if it's just a limitation of the app.

Thanks!

I bought a Rega RP8 / Apheta not long after they were released. The Apheta fell apart and Rega was kind enough to upgrade me to the Apheta 2 for only $1900 extra.

Anyway it was by far the worst TT I have ever owned, but did me a favor in that I ended up with a Technics SP10 EPA100 / EPC205 which made the RP8 sound like a 3 in 1, and cost me less than what I sold my RP8 for.

 

[cafe latte]

Has anyone used the iOS RPM app to measure the wow/flutter on a Rega P8? I haven't been able to get a value lower than .17% - which seems kind of high for a higher end Rega. I'm trying to figure out if there is potentially an issue with my table not spinning true, or if it's just a limitation of the app.

Thanks!

Its not Rega have very bad wow and flutter, this is a chart off the wall from a Rega tour what Rega consider as OK for each of their models.

Chris

 

[Panamafred]

Has anyone used the iOS RPM app to measure the wow/flutter on a Rega P8? I haven't been able to get a value lower than .17% - which seems kind of high for a higher end Rega. I'm trying to figure out if there is potentially an issue with my table not spinning true, or if it's just a limitation of the app.

Thanks!

My RP6 is in that same neighborhood using the phone app. Every other table I own reads out a significantly lower number!

This bugs the hell out of me but I don't hear the w/f on the Rega.

 

[theclipper]

My RP6 is in that same neighborhood using the phone app. Every other table I own reads out a significantly lower number!

This bugs the hell out of me but I don't hear the w/f on the Rega.

Glad I’m not the only one! It makes me feel a little better if this pretty common for Rega’s.

I started worrying about it because I thought I detected a slight wobble when looking at the platter from the side. But it also may just be an illusion from the way the glass layers are glued together.

 

[cafe latte]

My RP6 is in that same neighborhood using the phone app. Every other table I own reads out a significantly lower number!

This bugs the hell out of me but I don't hear the w/f on the Rega.

Some dont, but I do an some music especially. Issue for most though with around the 0.2% is when the record has the hole slightly off centre which many records have. So imagine the turntable has 0.2% wow and flutter, then the record introduces 0.2% the two combined can arrive at very obvious wow.
Chris

 

[Aerobat]

My TT was in the .15% range and a bearing clean/lube and speed pot upgrade brought it down closer to where it should be. Very useful app.

 

[theclipper]

My TT was in the .15% range and a bearing clean/lube and speed pot upgrade brought it down closer to where it should be. Very useful app.

It's too bad that app isn't available on iOS. I'd be curious to see how the results varied on the same table.

 

[theclipper]

My RP6 is in that same neighborhood using the phone app. Every other table I own reads out a significantly lower number!

This bugs the hell out of me but I don't hear the w/f on the Rega.

Hey as a follow-up: do you get a hum sound in the speaker if you touch the red or white cartridge wire connects? Just wanted to make sure that was normal; and that I didn't have some sort of grounding issue.

 

[Panamafred]

Hey as a follow-up: do you get a hum sound in the speaker if you touch the red or white cartridge wire connects? Just wanted to make sure that was normal; and that I didn't have some sort of grounding issue.

Expect all sorts of weird noises when you touch those!
That'll happen with any turntable

 

[ejman]

Its not Rega have very bad wow and flutter, this is a chart off the wall from a Rega tour what Rega consider as OK for each of their models.

Chris

I'm happy to see that my 21 year old Rega P3-2000 outperforms the RP10. I guess I'll save my money. I do need to mention that I installed a Tangospinner sub platter as well as the dual belt brass pulley. Upgrade cost was about $180 so I was quite pleased after spending money like a drunken sailor,

 

[loudnoises]

My early dual 1219 with original idler. Only about 2 minutes warmup, speed gets up after a few.

I love this table.

 

[Nashou66]

for iOS I use this app

 

[theclipper]

for iOS I use this app

Same here, haven’t been able to get a w/f of less than .17 % on my P8.