Steve Deckert
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Hi Rocky,
The HI LO gain option sets up the jacks on the left side of the machine as low output and the right side for high output. The reasoning behind it is to keep the noise floor of the amp just below the threshold of the headphone's sensitivity so you don't hear any hum. It's not a planer / dynamic thing, as either could work well in both jacks. It's more of a sensitivity vs. impedance equation. Many headphones will work rather well in both jacks, so it becomes a subjective preference at that point. Basically if you hear hum in the background with the headphones in the right side jacks, switch the left side jacks and it will typically go away.
The maximum number of phones is 4. Be aware that the amp is very happy to drive a pair of 4 ohm loudspeakers, so it is very possible to drive 4 pair of 30 ~ 70 ohm planar headphones at the same time. Same goes for higher impedance dynamics. In situations where using multiple headphones that do not match, some combination will dictate how each headphone sounds and how loud it is relative to the others. But yes, the Taboo can easily negotiate up to 4 pairs of headphones at the same time.
Steve
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