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#2431977 06/15/15 08:37 AM
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Howdy folks,

I like to crank my PX-5S a little through my interface and monitors in order to yield a more realistic volume for playing piano at.

However, somewhere in that range it introduces audible hum (I tested, it's the unbalanced lines) and I know for a fact that a DI box may solve this. I however only have experience with guitar DI boxes which appear to be a little different.

I looked briefly on www.bax-shop.nl where they have the Samson MD2 and the Radial ProD2.

Do I have to purchase the Radial to get anything reasonable or is there something else out there that will be fine?

I understand it's a bit of a luxury thing right now, but I just wondered.

Cheers!
CZ


Casio Privia Pro PX-5S, Focusrite Saffire Pro40, Steinberg UR22, KRK RP6 G2, JBL LSR305
Guitar, mandolin and banjo player, hobbyist producer.
on YouTube
Cue Zephyr #2432085 06/15/15 12:39 PM
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The two main venders available from shops in the US are Radial and Whirlwind. I am a big fan of the build quality, features, and sound on the Radial stuff.

They make a mono (ProD1) and a stereo (ProD2) version. I've used both. If you're taking the L/mono output of the PX-5S mainly than the cheaper D1 will be fine. If you like to run in stereo, the D2 is more money but is what you need to do the job. As has been mentioned and debated on the forums, there is debate about what is better, but I am an the "mono is best" camp for gigs that involve a large PA system. Stereo is nice for small venues where you're just running vocals through the PA.

But you asked for home use with your interface. So definitely stereo. I would also test ground issues with the monitors, and the computer/interface. If your interface has balanced outs, you might solve this there. If it's definitely the Casio, you can try there as well.

Cue Zephyr #2432351 06/16/15 03:49 AM
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I can safely say that all the interconnected equipment is in the same power outlet. As far as I understand it, this avoids ground loops.

As I said, it's a bit of a luxury thing since I'm not gigging yet and it's not as if the noise is unbearable. If I play normally, I don't really hear it much.

I'll keep the ProD2 in mind though, cheers!


Casio Privia Pro PX-5S, Focusrite Saffire Pro40, Steinberg UR22, KRK RP6 G2, JBL LSR305
Guitar, mandolin and banjo player, hobbyist producer.
on YouTube
Cue Zephyr #2432354 06/16/15 04:10 AM
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I use a Samson S-Direct Plus. It has 2 channels. It is an "active" DI box, therefore requires either a 9 volt battery or Phantom power to run. It is sometimes hard to know whether you should choose an active or passive DI box. 2 channels is great, as it gives you the option of either running in mono or from both the left and right outputs. Recently I played at a concert on my guitar, and I had a passive electric guitar going into one of the DI inputs and an active Yamaha bass guitar going into the other. Their output signals to the PA were both nice and clean. I ran the DI box on battery power, not Phanton power.

Radial is also known to be good, but quite pricey.

Have you tried using a headphone adapter plug and send your stereo signal from one of the PX-5S's headphone outs? A friend who has a PX-5S does this and it separates to two individual mono 6.5mm jacks on the other end. Works well, and plenty of volume. Sometimes the output impedance of the headphone socket is different to that of the main Left and Right audio outputs.



1993 Roland JV1000 76 note workstation synth with Pop and VE-GS1 expansion boards ] 1994 Roland JV1080 Multi-timbral sound module ] 1994 Roland KR4500 Intelligent Piano ] 2008 Korg MicroX sound module ] 2015 Kawai MP7 Digital Stage Piano
Just Alan #2432357 06/16/15 04:41 AM
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Are you sure you've narrowed down the hum culprit to your PX-5S?
A DI Box, as desirable as it is, seems an expensive fix.

I have a PX-5S and I've never had a hum problem with unbalanced cables. How do you run your relative volume levels? IMO you should run the piano high, the interface mid and the speakers as low as possible (below 12 o'clock if poss). (How about plugging an EB Tech Hum Eliminator between your power strip and the wall?)

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Originally Posted by Just Alan
Have you tried using a headphone adapter plug and send your stereo signal from one of the PX-5S's headphone outs? A friend who has a PX-5S does this and it separates to two individual mono 6.5mm jacks on the other end. Works well, and plenty of volume. Sometimes the output impedance of the headphone socket is different to that of the main Left and Right audio outputs.

I'll remember that Samson model, I didn't know about it yet.

I'm not sure why one would use headphone outs when there's line outs, but I may not have enough knowledge of certain gear and their impedance and how they may or may not play nice together.

Originally Posted by moleskincrusher
I have a PX-5S and I've never had a hum problem with unbalanced cables. How do you run your relative volume levels? IMO you should run the piano high, the interface mid and the speakers as low as possible (below 12 o'clock if poss). (How about plugging an EB Tech Hum Eliminator between your power strip and the wall?)

I run the PX-5S high, about 75-90% of max volume. I run the interface (Focusrite Saffire Pro40) high, about 50-80% of max volume and run the speakers (KRK RP6 G2) high as well - if I remember correctly, they are somewhere between -6dB and 0dB sensitivity.

I run levels high to somewhat simulate the volume and dynamic that an acoustic piano would have normally.


Casio Privia Pro PX-5S, Focusrite Saffire Pro40, Steinberg UR22, KRK RP6 G2, JBL LSR305
Guitar, mandolin and banjo player, hobbyist producer.
on YouTube
Cue Zephyr #2432764 06/17/15 05:36 AM
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I think I may have found the problem. The only cables I have are balanced, but the line-outs on the PX-5S are unbalanced.

Common sense tells me that basically what happens here is that only half of the cable is being used and the other half is just picking up electrical interference, essentially acting as an antenna.

I came to this conclusion when I noticed the PX-5S's volume control did not influence the hum volume.


Casio Privia Pro PX-5S, Focusrite Saffire Pro40, Steinberg UR22, KRK RP6 G2, JBL LSR305
Guitar, mandolin and banjo player, hobbyist producer.
on YouTube
Cue Zephyr #2432774 06/17/15 06:46 AM
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Originally Posted by Cue Zephyr
I think I may have found the problem. The only cables I have are balanced, but the line-outs on the PX-5S are unbalanced.

Common sense tells me that basically what happens here is that only half of the cable is being used and the other half is just picking up electrical interference, essentially acting as an antenna.

I came to this conclusion when I noticed the PX-5S's volume control did not influence the hum volume.


Ah, I've made this mistake before, but didn't think of it when you described your problem. Glad you were able to figure it out. Good thread on DI boxes, though. I bought a cheap one recently and I think it's failed already, so spending the extra for nice ones does make a difference!


private piano/voice teacher FT

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Cue Zephyr #2433304 06/18/15 03:56 PM
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I recorded silence with the (balaned) cables that I use now and a single high-quality (unbalanced) instrument cable that I have.

The recording with the instrument cable had no audible hum in it. Same gain level etc.


Casio Privia Pro PX-5S, Focusrite Saffire Pro40, Steinberg UR22, KRK RP6 G2, JBL LSR305
Guitar, mandolin and banjo player, hobbyist producer.
on YouTube

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