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#2400840 - 03/21/15 01:12 AM Kawai RX-3 lower string buzz...
BoisePhil Offline
Junior Member

Registered: 02/25/15
Posts: 4
Loc: Boise, ID
So my "new" 2010 RX-3 has been in my home for about 5 weeks. I've had it tuned twice and some regulation done on it. My technician seems to be very competent and is in high demand in my area. The second tuning was because I was complaining about it being out of tune after only a few days. I guess I'm very sensitive to the "unisons" being out and he offered to teach me how to do those. I'll take him up on that soon.

HOWEVER...I do have the lower string "metallic buzz" that was discussed in a long thread back in 2008 or 2009. It drives me a little nuts. It's one or two strings primarily...the second F below middle C and the F# next to it. Above and below those two notes the sound smooths out nicely. The manager at the store where I bought the piano said it sounded like it might be a damper wire rubbing on a string when the note is struck hard. My technician says no and that it's a voicing issue. I hear the metallic rattle when I hit the key F (forte). There are a few notes in the same area that border on having the rattle but I could also call them just "brighter".



So I know that these threads were closed back in '09 but was there ever a consensus on what was causing that? I read it again tonight and it was quite a heated discussion at times.

I'd really love to know if I'm going to have to live with this or will it get fixed. It's NOT my imagination. I think the "settling in" argument is bunk. None of the 86 of the other keys have this metallic ringing.

Kawai RX-3

#2400866 - 03/21/15 04:20 AM Re: Kawai RX-3 lower string buzz... [Re: BoisePhil]
Robert 45 Online   content
1000 Post Club Member

Registered: 08/18/06
Posts: 1391
Loc: Auckland New Zealand
Hello Phil and welcome to Piano World!
I am sorry to hear about the buzzing note problem with your "new" Kawai RX-3 piano.

Your piano should be still under the Kawai transferable warranty and if the problem is not resolved to your satisfaction, you should contact Kawai America.

According to your piano technician, the problem can be put right by voicing. Why then has he not remedied the problem which affects only 2 notes?

Of course, after 5 weeks your piano should have settled and your technician should have advised you of any signs of humidity or temperature problems in the placement of your piano.

Pianos can be temperamental when moved, but instability is usually manifested in tuning insecurity.

Did you notice the problematic notes when you were trying it at the dealer's?

An experienced, competent piano technician should be able to analyze the problem quickly, but we can merely speculate about the cause. I hope that it can be resolved promptly.

Kind regards,


Edited by Robert 45 (03/21/15 04:23 AM)

#2401114 - 03/21/15 10:08 PM Re: Kawai RX-3 lower string buzz... [Re: BoisePhil]
Burnside Piano Offline
Full Member

Registered: 12/28/14
Posts: 51
Loc: Franklin TN
Your tech may well be on the right track. RX-series grand are fabulous, but they sometimes have a few notes in the bass that require upper shoulder needling; once that's done correctly the tone smooths right out. I find it most commonly among the single wound strings in the 5' GM-series grands, but it can occur in the higher-end models as well.

Ask your tech also to check the string leveling in the wound unisons and to make sure the strings are seated on the bridge.
Kent Burnside
Registered Piano Technician
Franklin TN 37064

#2401129 - 03/21/15 11:17 PM Re: Kawai RX-3 lower string buzz... [Re: BoisePhil]
BoisePhil Offline
Junior Member

Registered: 02/25/15
Posts: 4
Loc: Boise, ID
Thanks guys. I hope it's as simple as you describe. Robert, my technician didn't work on those notes while he was here because he had spent his time tuning, regulating ( a few hammers were misaligned with their back-checks), and working on after touch issues. He said he would work on the voicing when he comes back for the next tuning. That was fine with me. Thanks for the input!
Kawai RX-3

#2401156 - 03/22/15 01:04 AM Re: Kawai RX-3 lower string buzz... [Re: BoisePhil]
Robert 45 Online   content
1000 Post Club Member

Registered: 08/18/06
Posts: 1391
Loc: Auckland New Zealand
Thank you Phil. There is a Kawai RX voicing manual which is available on the internet and that mentions deep needle voicing in shoulder of the hammer to release tone and increase sustain. Kent's comments about string leveling and the seating of the strings on the bridge and other termination points must also be considered. No doubt your technician will have a repertoire of remedies to improve and hopefully cure these irritations.

All the best!


#2403127 - Yesterday at 10:19 AM Re: Kawai RX-3 lower string buzz... [Re: BoisePhil]
Steve Senseney Offline
Full Member

Registered: 10/29/14
Posts: 42
I had a buzzing bass string. It was because a little glue or lacquer had stiffened the surface of the damper.

Check to see if you have the same buzz when the damper is raised.


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