220 Pro and Headphones

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If you plan to connect headphones directly to the 220's pre-amp output, it might be worth bearing in mind that this isn't really what the pre-amp output is intended for. It will work best for high-impedance headphones; if the impedance is too low you might find the output can't drive the headphones properly - the tonal balance may not be right and/or the output level may not be sufficient. As @Pim suggested, try the headphones with the 220 before buying, if at all possible.