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Hello, I am new to this forum, just to ask a question. I own a Yamaha P85 digital piano and I am going to bring it to a Christmas concert to play at. I learned that the P85 has no output for speakers/amplifiers, and you have to get the output through the headphone jacks. I bought a 25ft instrument cable (male ends) to hook the piano up to the amplifier(stereo). Some few sources say that I need a headphone jack adapter to hook up the cable to the amplifier. Some of you who have P85s may have used this method, but I'm not sure of it's accuracy.

eHow,for example has this method.

Link:http://www.ehow.com/how_6744509_connect-yamaha-p_85-amp.html

My question is, would you really need a headphone jack adapter to connect the cable to an amplifier/speaker? Is it really necessary at all?

Owners of P85s and general music tech experts please reply. Thank you.

I have a Yamaha Piaggero and i bought a headphone splitter from amazon https://www.amazon.com/eBoot-Female...p;keywords=1+4+stereo+splitter&psc=1

The adapter gives you the ability to break out the signal. The adapter will break out the signal for the left channel and the right channel. You then could either plug into a stereo amp or experiment and see which side sounds better.

then used a 1/4 Stereo to Stereo cable and was able to hook up my piano.

https://www.amazon.com/Hosa-HSS-010...329869&sr=8-2&keywords=trs+cable

You could just use the cable and see how it works. You will not hurt anything. The only change would be using an adapter if the Yamaha headphone jack is a 1/8 jack. If so use this adapter

https://www.amazon.com/eBoot-Headph...ords=1+8+to+1+4+stereo+adapter&psc=1

This is not hard and you really cannot hurt anything.

Two possibilities:

1. The amplifier has separate "left" and "right" inputs jacks;

2. The amplifier has one "stereo" input jack.

If (1), you'll need a "stereo headphone splitter" (which plugs a stereo plug into the Yamaha's _stereo_ headphone jack, and gives you separate "left" and "right" plugs). The "left" and "right" plugs will plug into the appropriate jacks of the amplifier.

If (2), you'll need a "stereo-to-stereo" cable, with appropriate _stereo_ plugs on both ends (three contacts -- Tip / Ring / Sleeve contacts -- hence, it's also called a "TRS cable" in the music industry).