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Posted By: _offbeat MP11SE - Headphone Jack Unbalanced Sound - 10/20/19 04:07 PM
Hi pianoworld!!

I recently received my new MP11SE and sooooo much in love with this piano, I seem to be having some potential sound issues, through the headphone jack. Issues I've experienced:
- headphone unbalanced sound L/R ear (right ear is louder than left)
- headphone buzz/hum (like a guitar amp / mic) ONLY in left year
- buzz/hum comes in and out, and playing the lower register bass keys returns the buzz
- putting my hand on the left side of the piano and applying some weight causes buzz to disappear and sound volume to change.

I ordered through GC and they said this is typical to some instruments due to electrical interference, but could also be a defect (learning towards to latter). I went to PW and also found this headphone static post (http://forum.pianoworld.com/ubbthreads.php/topics/2845479/1.html)

I've tested with:
5 headphone models and 3 different (1/4 to 3.55m) adapters with consistent buzz/hum in ONLY left ear, through varied in level depending on headphone used. for some headphones, the right ear is consistently louder than the left. If I do NOT use the headphone jack, and use the line out through my focusrite interface connected to my iloud speakers, it eliminates all buzz and unbalanced-ness.

See reference:
(video of me using headphone jack + iloud, see sound change as i put my hand on the piano)
https://drive.google.com/file/d/1MBw8BKjVVjb3ThNVTRbO2JUz814FnSZS/view?usp=sharing
(video of adding weight to left side of piano with books and it being less of a problem)
https://drive.google.com/file/d/1C2TKWgQygxtlQe88P53ZKXCwtbAOsXGs/view?usp=sharing

I'm pretty convinced it is a defect at this point... but the previous post really helped make me feel like it wasn't only me so I just wanted to voice my concern here smirk This thing is 75lbs, basically more than 80% of my weight and it was insanely difficult to get up my stair... Scared to do the exchange and then have it happen again, I've read through so many quality control issues so far... This is an upgrade from my roland FP30, which I didn't have a problem for in 3 years. My ooold roland FP4 has also lasted me over 7 years. I'm so sad!


thanks for being here for me during these difficult times pianoworld.
-jas
Send it back. It's defective. None of those symptoms are normal.

The story they gave you Is nonsense. Ignore it.
"... this is typical to some instruments due to electrical interference"

This is only typical of defective equipment.
Originally Posted by MacMacMac
Send it back. It's defective. None of those symptoms are normal.

The story they gave you Is nonsense. Ignore it.
"... this is typical to some instruments due to electrical interference"

This is only typical of defective equipment.

Yep, there's something wrong with it. Sounds like it is likely a minor issue, but as it's a brand new instrument, you should let Kawai deal with it (unless you like to self-help with electronics).
Posted By: Doug M. Re: MP11SE - Headphone Jack Unbalanced Sound - 10/20/19 07:01 PM
Originally Posted by _offbeat
Hi pianoworld!!

I recently received my new MP11SE and sooooo much in love with this piano, I seem to be having some potential sound issues, through the headphone jack. Issues I've experienced:
- headphone unbalanced sound L/R ear (right ear is louder than left)
- headphone buzz/hum (like a guitar amp / mic) ONLY in left year
- buzz/hum comes in and out, and playing the lower register bass keys returns the buzz
- putting my hand on the left side of the piano and applying some weight causes buzz to disappear and sound volume to change.

I ordered through GC and they said this is typical to some instruments due to electrical interference, but could also be a defect (learning towards to latter). I went to PW and also found this headphone static post (http://forum.pianoworld.com/ubbthreads.php/topics/2845479/1.html)

I've tested with:
5 headphone models and 3 different (1/4 to 3.55m) adapters with consistent buzz/hum in ONLY left ear, through varied in level depending on headphone used. for some headphones, the right ear is consistently louder than the left. If I do NOT use the headphone jack, and use the line out through my focusrite interface connected to my iloud speakers, it eliminates all buzz and unbalanced-ness.

See reference:
(video of me using headphone jack + iloud, see sound change as i put my hand on the piano)
https://drive.google.com/file/d/1MBw8BKjVVjb3ThNVTRbO2JUz814FnSZS/view?usp=sharing
(video of adding weight to left side of piano with books and it being less of a problem)
https://drive.google.com/file/d/1C2TKWgQygxtlQe88P53ZKXCwtbAOsXGs/view?usp=sharing

I'm pretty convinced it is a defect at this point... but the previous post really helped make me feel like it wasn't only me so I just wanted to voice my concern here smirk This thing is 75lbs, basically more than 80% of my weight and it was insanely difficult to get up my stair... Scared to do the exchange and then have it happen again, I've read through so many quality control issues so far... This is an upgrade from my roland FP30, which I didn't have a problem for in 3 years. My ooold roland FP4 has also lasted me over 7 years. I'm so sad!


thanks for being here for me during these difficult times pianoworld.
-jas


Hi Jas,

In your situation, I would contact Kawai James and Kawai HQ in your country (via email) to ask if this is a known issue. The instrument will be under warrenty and your seller is GC, so they are responsible for resolving any malfunction under warrenty; however, by contacting Kawai, you go into the conversation with GC fully armed with any advise Kawai can offer to help speed along the process of getting it repaired.

Probably the issue can be fixed without replacing the instrument and I would get it sorted without racing to get replacement model---when heavy instruments are shipped, it's at this juncture that damage due to mishandling is most likely to cause a defect. That's what I did with my headphone malfunction on my Yamaha PSR7000 2 months into my ownership.

Kind regards,

Doug.
Despite what GC stated, those are not typical features lol.

Try disconnecting everything except the power cord and the headphones. Try plugging into a different outlet (use an extension to another room if possible). I don't think this is your issue.

You can use a flashlight to look inside the headphone jack to see if anything looks amiss.

Based on your videos and the neat variable adjustment feature, I would guess these are potential issues:

- bad headphone jack
- bad soldier joint
- short / damaged wire or component
- cracked or defective board

You may not easily DIY repair a bad board. So either return it or get it fixed.

If the action is smooth and quiet, you might ask GC to send a tech to repair at your house; he may require 2 visits if new parts are required.
Posted By: dmd Re: MP11SE - Headphone Jack Unbalanced Sound - 10/20/19 07:44 PM
It sounds like you have adequately tested with various headphones with similar results so that implies it is the connection on your MP11SE that is the problem.

If you explain that to GC I am sure they will agree.

Contact them and they should just replace you MP11SE with a different one.

Good Luck
Hello offbeat, welcome to the forum.

I'm sorry to read that you are experiencing some issues with the MP11SE's headphone output.

My recommendation would be to report this matter to my colleagues at Kawai America:

https://kawaius.com/technical-support-division/contact-us/

I hope this helps.

Kind regards,
James
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