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9. To expand the QH4 to allow for more than four individual headphone

outputs, you can connect multiple QH4 ampliﬁers together by plugging a

1/8” stereo cable into the Aux Output of the ﬁrst QH4 ampliﬁer and the

Aux Input of another QH4 ampliﬁer. You can repeat this step to add as

many headphone ampliﬁers as necessary. The Aux Output jack is after the

MASTER Volume/Power control, Mute and Mono switches, so all adjust-

ments to these controls will affect units further down the chain.

If you have connected different models of headphones to the QH4,

you may ﬁnd that some require more gain than others to achieve the

same volume. This kind of disparity occurs if the headphones have

different sensitivities or different impedances. The lower the imped-

ance, the louder the headphone will sound compared to another,

higher impedance headphone at the same volume setting. Sensitivity

is measured by determining the decibel (dB) level generated by 1 mW

of power input. The higher the dB rating, the louder the headphone

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Samson QH4 User Manual

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