PreSonus HP4 - Manual (Page 11)

7
Owner’s Manual
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Quick Start Guide 2
Hookup Diagrams 2.2
3.0 Hardware
3.1 Front-Panel Layout
Headphone Volume. The HP4 has the potential
to be very loud. (It goes to 12; 11 is for wimps!)
Please be careful when you first start passing sound
through the unit. It is best to start with the volume
set at 1 and then slowly bring up the volume.
Note that the loudness of your headphones will vary depending
on their design and their input impedance. The output impedance
of the HP4 is 51Ω (ohms), and it will work fine with professional
and consumer headphones but the volume will differ depending
on which type of headphone you use. Headphones with lower
input impedances will generally be louder than higher-impedance
headphones. (In this case, louder does not mean better!) Most
professional headphones have impedances between 150Ω and
600Ω. Consumer headphones for CD players and the like often
have impedances between 8Ω and 32Ω. Broadcast headphones are
specialized, and you are unlikely to use them with an HP4; their
impedances are typically between 1.5 kΩ (kilohms) and 2 kΩ.
Mono button. When you press the Mono button,
each input will be summed together on each
output. For example, if you plug a CD player
into the left input, and press the Mono button,
the signal from the left input will be present in
the left and right headphone channels and in
the master output. When the Mono button is