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Topic Options
#1428477 - 05/02/10 05:57 PM Re: Roland HP 305 hum [Re: spanishbuddha]
goatfreed Offline
Full Member

Registered: 04/28/10
Posts: 24
No the piano is the only thing in the wall socket. I've also tried a different wall socket with no change.

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#1429097 - 05/03/10 04:49 PM Re: Roland HP 305 hum [Re: goatfreed]
spanishbuddha Offline
2000 Post Club Member

Registered: 11/08/09
Posts: 2434
Loc: UK
Originally Posted By: goatfreed
No the piano is the only thing in the wall socket. I've also tried a different wall socket with no change.

From the manual:
Using the unit near power amplifiers (or other equipment containing large power transformers) may induce hum. To alleviate the problem, change the orientation of this unit; or move it farther away from the source of interference.

After this I'm out of ideas, other than it's a defect.

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#1429543 - 05/04/10 01:08 PM Re: Roland HP 305 hum [Re: spanishbuddha]
goatfreed Offline
Full Member

Registered: 04/28/10
Posts: 24
conclusion: I went to the dealer and looked at the unit on display. it hums as well. then I asked Roland tech support and they said that this is due to 50hz transformator hum and not a defect.

I also listened to all other digital pianos at the dealer (who had only another roland 201 and the rest were yamahas). none of them hums smile. anyway I guess I will just live with it. it's just a shame that roland made a really good digital piano and then put in such a bad sound system. I compared with e.g. the Yamaha 330 and the Hp 305 feels definitely more natural to me as a piano (this is the first digital I really play on, before I played on an upgright and a grand that my mom owns).

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#1429652 - 05/04/10 05:29 PM Re: Roland HP 305 hum [Re: goatfreed]
spanishbuddha Offline
2000 Post Club Member

Registered: 11/08/09
Posts: 2434
Loc: UK
Still puzzled. Isn't the power supply connector into the HP305 DC?

For example with my DP there is an AC power adapter that plugs into the wall socket, but the output from that adapter is 12V DC which drives the DP. Unless it's poorly smoothed there shouldn't be that much 50/60Hz ripple getting into the audio system. Try a new adapter if that's the case.

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#1429675 - 05/04/10 06:03 PM Re: Roland HP 305 hum [Re: spanishbuddha]
MacMacMac Offline
3000 Post Club Member

Registered: 09/24/09
Posts: 3871
Loc: North Carolina
Originally Posted By: spanishbuddha
Still puzzled. Isn't the power supply connector into the HP305 DC?

For example with my DP there is an AC power adapter that plugs into the wall socket, but the output from that adapter is 12V DC which drives the DP. Unless it's poorly smoothed there shouldn't be that much 50/60Hz ripple getting into the audio system. Try a new adapter if that's the case.
Smaller DPs and keyboards have outboard power supplies, like yours.

Larger consoles have inboard supplies, like most other appliances. The HP305 has no adapter ... just an AC power cord.

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#1429921 - 05/05/10 09:25 AM Re: Roland HP 305 hum [Re: MacMacMac]
goatfreed Offline
Full Member

Registered: 04/28/10
Posts: 24
That's right. The Power supply is internal.

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#1430189 - 05/05/10 05:28 PM Re: Roland HP 305 hum [Re: goatfreed]
spanishbuddha Offline
2000 Post Club Member

Registered: 11/08/09
Posts: 2434
Loc: UK
Hmmm...bummer. Thanks for the info though. The HP305 was under my consideration, although slightly out of budget.

I went to my local dealer today, turned the volume full up on the HP305 there and could hear a hum. I did the same thing on an HP307 and no hum.

It's a pity and I think that for my use I have to strike it from my list. Maybe I'm just being too picky and the hum would go unnoticed amongst the other hummers in my home: fridge, sub-woofer, audio, surround sound, etc. Mainly just the fridge it's really loud.

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#1430195 - 05/05/10 05:37 PM Re: Roland HP 305 hum [Re: spanishbuddha]
Kawai James Offline
9000 Post Club Member

Registered: 09/06/07
Posts: 9572
Loc: Hamamatsu, Japan
spanishbuddha,

Would you ever play a digital piano at full volume, though?

In my opinion, at this volume level the instrument would be uncomfortably loud.

Cheers,
James
x
_________________________
Employed by Kawai Japan, however the opinions I express are my own.
Nord Electro 3 fan & occasional rare groove player.

"Richard, none of us could forget you have a CLP-990." - EssBrace, 2014

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#1430515 - 05/06/10 09:31 AM Re: Roland HP 305 hum [Re: Kawai James]
spanishbuddha Offline
2000 Post Club Member

Registered: 11/08/09
Posts: 2434
Loc: UK
Hi KawaiJames

No not even my old ears would want to have the piano at full volume.

It's just that, as the OP said, at normal volume in the store you can't hear the hum, and I was looking for more proof that there really was one.

I have to say I am surprised at this on one of Roland's new DP's, and for the price being asked I would be disappointed to get it home and hear an annoying hum in the silence of a room. Sometimes I think we're picky about things that are perhaps quite unimportant, but I worked hard for my money :-)

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#1430553 - 05/06/10 10:52 AM Re: Roland HP 305 hum [Re: spanishbuddha]
tonkempen125 Offline
Junior Member

Registered: 01/04/10
Posts: 4
I actually have exact the same hum in my piano, so perhaps it's a Roland thing... It's a 2005 Roland HP-7e. Just as being described here, the hum is discrete yet distinctive and since I noticed quite annoying too.

The hum originates from the inside somewhere on the top left, right where the power cord is plugged into the piano. I am very sure, reading here, that the topic-starter's hum is the same as what I am experiencing. Also the sound is NOT coming from any of the speakers, nor is it audible on the headphones, nor has the volume switch any influence on the presence or intensity of the hum.

I am btw living in Holland (The Netherlands, Europe) , we have 230V @ 50hz here, can that perhaps be of any influence?

Topic-starter, have you found a solution yet or a definitive answer to this?


Edited by tonkempen125 (05/06/10 10:59 AM)

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#1430574 - 05/06/10 11:39 AM Re: Roland HP 305 hum [Re: tonkempen125]
ChrisA Offline
3000 Post Club Member

Registered: 12/28/08
Posts: 3841
Loc: Redondo Beach, California
Originally Posted By: tonkempen125
..
I am btw living in Holland (The Netherlands, Europe) , we have 230V @ 50hz here, can that perhaps be of any influence?

Topic-starter, have you found a solution yet or a definitive answer to this?


I think your 230V 50Hz power could make a large difference. You have have a different transformers then used in North America or there would be a switch that causes only 1/2 of the primary winding to be used. Either way conditions are different.

If the piano is not under warranty there are some easy and some harder fixes to try. The simplest is mont the transformers with little soft rubber washers made for vibration isolation. The harder fix is to replace the power supply or move it to an external box

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#1432252 - 05/08/10 01:38 PM Re: Roland HP 305 hum [Re: ChrisA]
goatfreed Offline
Full Member

Registered: 04/28/10
Posts: 24
@spanishbudda: the hum is not dependant on the volume of the piano. what I meant was the volume of the surroundings smile. so the piano hums even when the volume is at zero.

@tonkempen125: could be a European issue because I live in Vienna/Austria. But I don't see how having 50hz bd 60hz could result in a transformator hum.

One thing that I guess would help is opening the piano and disconnecting the transformator ground, but I don't think I'll go down that route. At least I won't as long as I've got warranty smile Anyway I don't mind that much, I still enjoy having a piano that feels excellent, sounds ok and most important I can play either with headphones or volume turned down when the kids are asleep. I briefly considered switching to a Yamaha, but I tried the Yamaha CLP 3xx line in the store and somehow they didn't feel right (that's very subjective of course). One of the main usages is also for my kids to learn piano and I want an instrument for them that's closest to a real piano in touch.

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#1432319 - 05/08/10 03:08 PM Re: Roland HP 305 hum [Re: goatfreed]
MacMacMac Offline
3000 Post Club Member

Registered: 09/24/09
Posts: 3871
Loc: North Carolina
Power transformers operated from mains power will vibrate.
A good transformer, properly mounted, will not produce a noticeable hum.
But if there are problems with the design or construction, you may notice the hum.

With 60 Hz power, the hum will be at 60 Hz.
With 50 Hz power, the hum will be at 50 Hz.

When a device is designed to work from either 50 or 60 Hz power, it is sometimes the case that the hum is louder when operating from 50 Hz power than from 60.

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#1432438 - 05/08/10 05:23 PM Re: Roland HP 305 hum [Re: MacMacMac]
hpeterh Offline
500 Post Club Member

Registered: 01/26/10
Posts: 824
Loc: Germany
At 50 Hz the core of the transformer becomes 20% more saturated and produces more hum.

If this piano has a voltage selector and if this can be set to 240V then this could help to reduce the hum.

Peter


Edited by hpeterh (05/08/10 05:24 PM)
_________________________
1929 Galaxy Blüthner Baby Grand
acer aspire m3300 AMD Phenom II X6


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#1432480 - 05/08/10 06:16 PM Re: Roland HP 305 hum [Re: hpeterh]
MacMacMac Offline
3000 Post Club Member

Registered: 09/24/09
Posts: 3871
Loc: North Carolina
Originally Posted By: hpeterh
At 50 Hz the core of the transformer becomes 20% more saturated and produces more hum. If this piano has a voltage selector and if this can be set to 240V then this could help to reduce the hum.
Well, that's a moot point, isn't it? There really isn't a choice. If the piano has a selector, it MUST be set to match the local supplied power. The other setting won't work.

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