cone flap,help required

[dba]

system;

Planar 3 RB300 Goldring 1006 with Michell Techno weight
Sugden A21a
Sugden CD21
Musical Fidelity XLPS V3 phono stage
Von Scweikert VR1on custom made stands
decent Ash designs rack (glas shelves)

I have taken the grills off the VR1s,and I noticed something for the first time;

when the needle lands on the record the main drivers flap noticeably,or shake quite fst to put it another way.they then do this while the record is playing.As a test,i turned the platter off and rested the needle on the record,and tapped the deck and also got cone flap.I discovered this phenomenon whislt surfing the web.

So what do I do? It cant be right,the drivers shouldn't wobble like that,at least i think they shouldn't!!

[royphil345]

http://forums.audioreview.com/showthread.php?p=70769#post70769

Basically, The cartridge works by converting movement of the stylus into movement of the speaker drivers. Larger movements of the stylus...

[dean_martin]

Seems like I remember experiencing something similar when I was trying to get rid of a static electricity build up problem. I disconnected the ground (which seems counter-intuitive but I got the idea from my turntable manual of all places) and went from a felt mat to a None-felt (which you must be very careful with) with no problems since. If your floor is carpeted or you have a rug in front of your system like I did at the time, then this is the time of year when static can become a problem.

[risabet]

system;

Planar 3 RB300 Goldring 1006 with Michell Techno weight
Sugden A21a
Sugden CD21
Musical Fidelity XLPS V3 phono stage
Von Scweikert VR1on custom made stands
decent Ash designs rack (glas shelves)

I have taken the grills off the VR1s,and I noticed something for the first time;

when the needle lands on the record the main drivers flap noticeably,or shake quite fst to put it another way.they then do this while the record is playing.As a test,i turned the platter off and rested the needle on the record,and tapped the deck and also got cone flap.I discovered this phenomenon whislt surfing the web.

So what do I do? It cant be right,the drivers shouldn't wobble like that,at least i think they shouldn't!!

Some movement of the cone is normal with LP playback but the tapping leads me to believe that you have a breakthrough problem. Try moving the TT to a small, light table and try your test again. Same result? Yes, try a heavy massive table. Same result? Buy a new, suspended TT, just kidding. Where you place the TT is important. Try to place the unit in a bass null which you can find by walking around while playing a test CD. Listen for the area with the least bass and, if possible, stick you TT there.

[E-Stat]

when the needle lands on the record the main drivers flap noticeably,or shake quite fst to put it another way.
First thing, turn down the gain!


they then do this while the record is playing.As a test,i turned the platter off and rested the needle on the record,and tapped the deck and also got cone flap.
You're watching the cone reproducing subsonic noise. As suggested earlier, you have an isolation problem or a resonance issue arising from a bad cartridge to arm mass match.

While glass racks are pretty, they are poor sound isolators. Is the deck sitting on a glass shelf? You may want to research the cartridge arm compatibility issue as well.

rw

[dba]

how do i turn down the gain? impossible with my amp i think

and the cart is measured as being perfect for the RB300,the previous ccart wasnt,but i still have flap with the new Goldring 1006

[E-Stat]

how do i turn down the gain? impossible with my amp i think
Always cue records with the volume control turned all the way down.


and the cart is measured as being perfect for the RB300,the previous ccart wasnt,but i still have flap with the new Goldring 1006
That narrows down the issue to isolation.

rw

[royphil345]

It's not necessarily a cartridge / arm mismatch or an isolation problem. A bad cartridge / arm match will make things worse. Better isolation would help if the problem gets much worse at higher volumes (meaning your picking subsonic up feedback from the speakers to the turntable). It's a normal occurance with vinyl. Higher compliance MM cartridges seem to suffer the worst. (unless they have the "Dynamic Stabilizer" brush of the Shures). Most records aren't perfectly flat. When the stylus hits hills and valleys, the cartridge suspension flexes. The magnet in the cartridge is moved a greater distance across the coil than it would be from the music in the grooves of the record. A pretty powerful signal is produced, but below frequencies you can hear.

Damping factor of the amp may be a factor, as I have noticed that this problem is worse on some systems than others with the same turntable. If your drivers aren't coming close to bottoming out, it shouldn't hurt anything.