Hello, I'd like to buy headphones for my Roland RD 700 SX. Which impedance should I choose? I have already plugged a 32 ohm impedance set of headphones and I had the impression this value was too small. The sound was already pretty loud with the sound level of the piano almost set to zero. There is not much information in the user manual. Should I go for 50-60 ohms, 150 ohms, or does it matter at all? Yoann
