Coen van Dongen

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@StanislavStanchev 3 күн бұрын

Wonder will this change the sound a bit, with the shanks not being from wood. And what do you use to lubricate the knuckles/rollers?

@CoenvanDongen 3 күн бұрын

Everything changes/affects sound. The shanks not being from wood will make the flexibility and weight incredibly uniform thus also very uniform in sound. If the knuckles need lubrication I use teflon powder.

@StanislavStanchev 3 күн бұрын

@CoenvanDongen Yeah, I guess so :) Thanks for the information!

@endlessbegin1350 8 күн бұрын

Echt fantastisch dat je dit allemaal zo duidelijk filmt en monteert. Heel leerzaam en leuk om te zien dat je op eenzame hoogte bent qua kwaliteit!

@CoenvanDongen 8 күн бұрын

Dankjewel voor de complimenten!

@bokjedegeus3798 19 күн бұрын

Mooi Coen!

@BertFlanders 21 күн бұрын

Ik wens je een top 2025! Groetjes uit Vlaanderen.

@reinierweerts6923 28 күн бұрын

This would be a good starting point if one wanted to add a soundboard 'experience' to a custom enclosure right, sound input from VST? Case in question: I want to buy a Kawai MP11SE, but also played the Kawai NV5S and liked the feeling / resonance a lot. It's too expensive and heigh for my intended use though. Any tips with regard to choosing material to build the soundboard / ribs from? Great video!

@FlyWithNoam Ай бұрын

I have those transducers. I use them to inject sine waves to the bridge to relax the bridge strings and soundboard. So you’re recording and injecting opposite waves in real time.. noise cancelling. Does it increase sustain length? Because now the soundboard vibrates less, and doesn’t ingest the energy quickly. I can’t wait to try this next week when I get home! Thanks!!!!

@CoenvanDongen Ай бұрын

I don't think I'm following you. I'm not recording any sound. I take the sound from the silent system and than amplify them with the two trancducers. So the hammers get stopped just before the strings with a stop rail and the sound is a digital piano projected on the soundboard. Don''t expect to much from it though. It's not a massive sound. It's just a way to get the volumes between playing softly acoustic and complete silence. Great if you want to practice in the evening but don't like headphones.

@FlyWithNoam Ай бұрын

@@CoenvanDongen oh! Here is what I thought you were doing: Playing. In real time a computer is recording with microphone. And in real time sending back what you are playing to the transducers, but in inverse wave form - directly to the soundboard. That’s how noise cancelling headphones work. It cancels out the vibration. That’s what I thought you are doing. But now i understand what you are actually doing haha. Much more simple than what i imagined.

@reinierweerts6923 28 күн бұрын

@@FlyWithNoam This does sound like a really cool concept to try! Any progress?

@FlyWithNoam Ай бұрын

Great videos! I think you may realize that standwood doesn’t yield to any magical action. There are pianos out there sometimes Steinway sometimes not, right from the factory with absolutely heavenly action that every famous pianist in the world is just in love with. And those action don’t draw a nice graph in excel for down and up weight. Because pianists don’t feel the difference between 48g or 52g. There are actions at 40g which all pianists will say is heavy, and actions at 60g which all agree feels light. The uniformity from note to note in terms of grams is just not the solution. Although it doesn’t hurt to please the excel graph, it’s just not the solution and the answer is not there. Sorry to say. Your experiment with where to place the weights has failed because you even mentioned you arrived at no conclusion. Therefore you place somewhere in the middle o in hopes that the middle is the good place. That is not a conclusion nor is it scientific. You should explore further the difference between small weight in the end versus large weight in the center. I fear you will not find much difference in reality between the 2 cases but it’s worth exploring with extra effort. The true soul of any action is fundamental and rather basic. For every x mm the key moves down, how many mm does the hammer move up. If this ratio is to the pianist taste, they willl find heavenly action regardless of touch weight up or down. Of course if there is too much friction, it’s all garbage anyway.

@CoenvanDongen Ай бұрын

You don't need to say sorry to say. I completely agree with you. Downweight does not tell much about the playability. And factorys in general do a pretty good job making good playing instruments. And yes a good balance between the hammerweight and Ratio has the biggest share in a good playing instrument. The point of the experiment was that it is impossible to make two matching grand pianos with a different lead pattern. And also probably impossible to say if one is better than the other. I think there will be a matter of taste involved with this. The experiment did point out that there is a difference between lead in the front and lead in the back. So when calibrating the keys I think the placing of the lead should be as regularly as possible. Putting the lead regularly in the front or in the back would be fine also. As long as it is regularly. The lead pattern method I show is imo a great way to achieve this. I've also seen other good ways. So Yes, placing of the lead, and balance weight is just a little piece of the bigger puzzle. But I think it is great to take every little piece of the puzzle (at least) in consideration when balancing an action.

@FlyWithNoam Ай бұрын

@ perhaps it’s best to decide where the leads to go, by weighing the entire key? And by making sure the keys from a0 to c8 reduce in over all weight evenly and in a linear way? Have you graphed the key weights after installing your leads? The entire key, on a scale. As a whole, with the back check and capstan etc. I’m just thinking. I don’t know. I don’t have the answer to the leads :) Pianos are very annoying. Nothing too much is good. Nothing too little is good. Always some golden middle zone where things are nice. So max inertia is probably not good. Minimal inertia is not good. The question is simple. Lots of weight near the center or less weight near the end. I would have done the experiment in a more extreme way. Put a huge amount of weight extremely close to the center. I can imagine that with this scenario, any acceleration such as pressing down on the key from the up resting position would have minimal resistance to change. Also the change of direction as the key returns up would be quicker. But the felt under the key in the center will be much more compressed, because the key is so heavy as a whole. And perhaps this compressed felt would give a lazy feeling to the key.

@JeremyBorumComposer Ай бұрын

After watching and listening to many of your videos tonight, I think you might like the solo jazz Rhodes playing of Marcin Grochowina. www.youtube.com/@jazzijazzful

@JeremyBorumComposer Ай бұрын

I half subscribed for the speedy overviews of your excellent work, and half for the music. If you have any playlists anywhere please share!

@olgalitvi 2 ай бұрын

Thank you for video. Can I ask you, please - what you used for coloring of black keys?

@CoenvanDongen 2 ай бұрын

I used black dye with french polish

@matanvardi 2 ай бұрын

Great video this technique is amazing

@jumshudjabrailov1160 3 ай бұрын

Отличная работа!Интересно,сколько времени заняла эта реставрация?

@upcyclepianocraft 3 ай бұрын

What make is the scraper that you use? Thank you for sharing.

@CoenvanDongen 3 ай бұрын

It's a Bahco scraper

@upcyclepianocraft 3 ай бұрын

@@CoenvanDongen Thank you!

@PaPyRene 3 ай бұрын

Super interessante video... Ik heb dezelfde piano... en tinnitus... Vanaf 80 dB kan gehoorschade optreden. Mijn Kawai speelt luider en schel. Een risico bij lange speelduur. Nu gebruik ik het oefenpedaal met nadeel dat de dynamiek onbeheersbaar is. Mijn (toekomstige) oplossing wordt het intoneren van de hamers, en een polypress plaat van 6 mm, tegen de ganse achterkant van de piano, in een draagzak met rits, vastgehecht met klittenband (velcro) op de 'rug-omtrek' van de piano. De eindbedoeling is een mooie 'ronde' klank (afgezwakte hoge frequenties) met een laag volume, en behoud van dynamiek. Luider kan, door de klep bovenaan open te zetten, of door de klittenband wat los te trekken.

@FoodieFit 23 күн бұрын

Hoewel ik het vervelend vind dat je geplaagd wordt door tinnitus, moet ik toegeven dat ik het fijn vind iemand te treffen met hetzelfde probleem. Ik heb sinds een aantal jaar tinnitus klachten en speel piano. Ik wist niet dat een schelle piano en met name geluidsniveau boven 80 dB hieraan bij kan dragen. Mijn piano is erg hard, al van alles geprobeerd. Intoneren, eiermatjes erachter en zelfs het aanpassen van de inrichting. Ik heb nooit het geluid gemeten van mijn vriend, maar zal het zeker eens doen. Ik vind het zo jammer dat het mijn spel beïnvloedt, met name gebruik van pedaal is soms op de gok. Tonen stromen door elkaar heen en worden samen één brei van geluid. Ik baal er stevig van, maar het is wat het is.. Ik heb ook een elektrische staan. Daarbij hoor ik nog minder goed wat ik speel, tenzij ik mijn koptelefoon gebruik. Dan is het de meest gunstige situatie. Maar minder leuk spelen. Tja, het is een beetje zoeken. Wat je oppert klinkt interessant. Zou best het eindresultaat willen weten. Hou je ons op de hoogte? Ik hoop het, dank je wel ☺️

@PaPyRene 23 күн бұрын

@@FoodieFit Ik maakte een kommentaar op jouw reaktie. Maar die wordt gecensureerd. Nochtans geen websites in vermeld... In ieder geval indien deze video blijft zet ik er het resultaat van mijn volumebegrenzing en intonatie bij (binnen enkele maanden). Herinner mij er regelmatig aan aub ;-)

@FoodieFit 23 күн бұрын

@@PaPyRene doe ik, dank je wel ☺️

@michelerecchia8865 3 ай бұрын

Have you ever tried to do something similar on a grand piano? ...if it were ever possible to do so

@CoenvanDongen 3 ай бұрын

I have a customer who did it with pretty good result. He hung a paper under his grand piano and with crayon he drawed the outlines of the beams. So he had a paper with al the forms of the holes that needed to be filled. He gave them to a company that can cut the isolation precisely. He did 6cm thick polypress and on all sides 2mm extra so it fits firm in the holes.

@michelerecchia8865 3 ай бұрын

Thank you very much!

@PicturesHDx 3 ай бұрын

How long is your table?

@CoenvanDongen 3 ай бұрын

2.5 meters

@PicturesHDx 3 ай бұрын

@@CoenvanDongen WOW

@PicturesHDx 3 ай бұрын

How much time?

@CoenvanDongen 3 ай бұрын

I'm not sure how much time this was but I estimate 3 days of work excluding drying times of steam and glue offcourse.

@PicturesHDx 3 ай бұрын

@@CoenvanDongen thank you so much for replying I'm starting in my country in Latin America I am learning by myself and I wonder if I am charging too little I wish I could know

@PicturesHDx 3 ай бұрын

@@CoenvanDongen I Love you work and I love the professional listen you put into everything

@Nileponce 4 ай бұрын

My opinion of that product it creat low sound effect of the unit.

@wunna8657 4 ай бұрын

When does a grand piano require a full restring?

@bigjobbies 4 ай бұрын

well it look nice, I guess we can only assume it sounds better

@nihadmahmudov_-. 4 ай бұрын

Ellerine sağlık broo

@jessecopeland9728 5 ай бұрын

Therapeutic to watch and listen. Thank you.

@michaelpaul9236 5 ай бұрын

What is the tool that you use to pull the key bushing cloth through the slot in the key button at 2:47? Is it homemade or a standard technicians tool? I have never seen balance rail bushings done this way.

@CoenvanDongen 5 ай бұрын

I bought it at Jahn Pianoteile in Germany. I know most piano suppliers have these. I don't know the name.

@pearlshark1 5 ай бұрын

No soundboard shimming or recrowning?

@CoenvanDongen 5 ай бұрын

Nope, That was not necessary. It ws a fairly modern D with no cracks.

@pearlshark1 5 ай бұрын

@@CoenvanDongenthen why scrape and refinish the soundboard at all, then? Why not leave it alone?

@CoenvanDongen 5 ай бұрын

@@pearlshark1 Cosmetic reasons, The original varnish had little cracks. The client wanted to have it look like new so I renewed the varnish.

@pearlshark1 5 ай бұрын

@@CoenvanDongenthank you for your explanation. During the sanding process, is much spruce material removed from the board?

@CoenvanDongen 5 ай бұрын

@@pearlshark1 Just enough to get al the old varnish out.

@Igorc3 5 ай бұрын

Excelente trabajo maestro saludos desde Morelia México

@beonshapebeonshape8199 5 ай бұрын

Beh sembrano mooolto competenti ed efficaci!

@lorenkelley1568 5 ай бұрын

Um, the title says that this is an acoustical rebuild. But one of the most important things is to replace or at least test the tightness of the bridge pins. I saw the fellow filing the pins but I did not see anyone pull on them to test the tightness or replacing them.

@CoenvanDongen 5 ай бұрын

I agree that it can be an important piece of a restoration. But in this case the pins were tight and they did not show any signs of false beats. They were happy there so I kept them there ;) The filing was just for shiny reasons.

@garrettraylor4947 5 ай бұрын

Very Nice I would recommend editing your final frames/pictures as the hammer line does not show proper alignment. This may be confusing to some.

@CoenvanDongen 5 ай бұрын

But then.. what is a proper alignment. Is it straight? Knowing action ratio has small changes and ask for different blow distances? Or would you adjust them in the key depth? So many questions haha. But seriously I always set the final blow distance in the piano itself by measuring the aftertouch in the key. I agree an uneven line might confuse some people ;)

@JuliusThePianoGuy 6 ай бұрын

Really cool video and interesting to watch!

@rob_th 6 ай бұрын

Bedankt, heel interessant (ook de rest van je blogs)! Ik ben bezig met het uitzoeken van mijn eerste akoestische piano en maak mij een beetje zorgen hoe het qua geluidsvolume uit gaat pakken. Mocht het een probleem blijken te zijn dan is het fijn om te weten dat dit een oplossing is! Valt er nog iets te zeggen over het verschil in volume tussen bijv. een Kawai K-200 (114cm hoog) of een K-300 (122cm)? Hoger zal meer zijn, maar flink meer?

@CoenvanDongen 6 ай бұрын

Ik vind het moeilijk om daar een uitspraak over te doen. Bij de meeste Kawai dealers zijn deze modellen samen te beluisteren en te vergelijken.

@saveriosalerno9232 6 ай бұрын

Thanks!

@luigilamacchia1253 6 ай бұрын

Great job, as usual. Thanks for sharing

@TheMaximillyan 7 ай бұрын

Me thanks for it's AMAZING video there. IT (THE ACTON) must SUPER goes when your has do it smart job there! regards, Max,,,

@carlocondoluci574 7 ай бұрын

Again....great work.

@francescobarilla8669 7 ай бұрын

This is a bluthner! Old bluthner. I know... I have to copy that block 😪

@CoenvanDongen 7 ай бұрын

Yes! Those are very difficult blocks to copy because of the double height. Good luck!

@francescobarilla8669 7 ай бұрын

@@CoenvanDongen I've seen many, but other techs copied them in two separated layers, like the original, but in America there are multiple choice with block wooden materials and thickness. In Europe we are a little limited. Did you choose delignit? And for caps under brass plates? I appreciate your work of precision, I live in Italy and here there are very few expert technicians. Many turners, but not really "rebuilders"...

@edhartmann17 7 ай бұрын

Coen, het blijft fantastisch wat je doet. Iedere dag dat ik speel/studeer op jouw Bechstein project geeft zoveel inspiratie en energie. Mooie werkplaats en werkblad trouwens.

@ruitan7801 7 ай бұрын

@CoenvanDongen I have been following you. I hope China also has PTD training.

@drummerhammar 7 ай бұрын

Wat een prachtig werk!

@JacobEmch91 7 ай бұрын

Great work and video!

@billtheboatman 7 ай бұрын

Where do I learn how to do this and where do I get those tools?

@CoenvanDongen 7 ай бұрын

Depends on your location. Find a local pianotechnician. He can probably tell you more about the possibilities in your area.

@edwardmeijer3259 7 ай бұрын

Mooi Coen! Complimenten ook voor het filmpje en de uitleg 👍🏻

@saveriosalerno9232 7 ай бұрын

GREAT 😉😉😉😉

@sjaakdouma 7 ай бұрын

Nice!! De link geeft een 404 trouwens

@CoenvanDongen 7 ай бұрын

Dank voor de tip! Aangepast.

@mark9295 7 ай бұрын

Very nice Coen! Thanks!

@pianoselectzwijndrecht 7 ай бұрын

🔥

@hellopsp180 7 ай бұрын

amazing work

@WulfGray 8 ай бұрын

Не могу понять, для чего эта скорость? Из всего видео, полезности 50%

@LetWatersSing 8 ай бұрын

Wow, love these videos of Piano repair!! I've got a Cable Conover "BB" from about 100 years ago I'm working on at the moment, might have to consider doing this job?

@jaycee_nl 8 ай бұрын

Interesting. Do you know how many decibel the reduction of sound pressure is? That would be interesting information. Thnx!

@CoenvanDongen 8 ай бұрын

That is different with every piano and also... The result of the decibels reduction is relative to how much decibels the piano is. 3 dB less from 100dB is much more than 3dB from 99dB. Let's say it will reduce between 10 to 30% of the existing volume.

@jaycee_nl 8 ай бұрын

@@CoenvanDongen thanks! I will give it a try with my new Petrof P125. It goes fairly loud…..

@CoenvanDongen 8 ай бұрын

@@jaycee_nl Those are great pianos, but yeah also load. Let me know how it turnes out!

@jaycee_nl 6 ай бұрын

Indeed it makes the Petrof noticable more quiet, but it is still quite loud for my apartment….

@NerfRangetestsmore 8 ай бұрын

where do you live I might know you

@CoenvanDongen 8 ай бұрын

All my details are on my website ;)

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