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6. HEADPHONES, MONITORS & PFL
6.1 PFL : Pre-Fader listening
When any PFL button is depressed the main meters will change to displaying PFL level. PFL is the way
to hear, cue and set up a piece of music before you play it out in the mix.
J In the club environment, things get messy. You cant hear any sound in isolation, either on a
foldback system or headphones, because both are to some extent drowned out by the main
PA system. You should, however, be able to hear the PFL signal loud enough to detect the
beat, cue starts etc. What you cant do is to judge by ear exactly what level the next track will
come in at. For that you must use your eyes, and the highly-accurate bargraph VU meters.
PFL is also used to accurately check input GAIN. With a channels PFL button engaged (DOWN) you can
accurately measure the input GAIN by making a typical noise or playing a typical piece of music and observing
the main VU meters.
J If you are in the habit of slamming the channel faders all the way up (+6 dB), try to keep your
MAIN OUT control at a compensatory -6 dB to make sure you dont risk distortion. To do this
first set up output section EQ to suit the room or yourself. Now successively engage and disen-
gage PFL on the channel currently playing, all other channels silent. Adjust MAIN OUT until
the PFL and MAIN meter readings are identical. With channel faders at +6 dB and main output
level at -6 dB your DX100 has unity gain from input to output. Now PFL and MAIN metering
should show the same level, allowing direct visual comparison between outgoing (playing)
and incoming (cue) tracks.
+ If you re-adjust output EQ the above will no longer be true : re-set MAIN OUT level as described
in the paragraph above !
6.2 Headphones - read carefully!
The PHONES section lies to the far left hand side of the DX100, below the DJ MIC level control. (The PHONES
TRS socket is on the front panel right.) PHONES controls headphones output level. Right, thats the
easy bit explained. Now pay attention. BALANCE controls the blend of the PFL and MAIN mix signals.
This gives you the interesting possibility of hearing both the outgoing (MAIN) and incoming (PFL) tracks
simultaneously through a single output, via your headphones.
7. CONNECTIONS
7.1 PRO MIXER DX100 connections
Follow us on a walk along the case of your PRO MIXER:
Mic input. 1/4 jack socket, tip = hot (+ve), ring = cold (-ve) and sleeve = ground/screen.
Phones. 1/4 jack socket, tip = left signal, ring = right signal and sleeve = ground/screen.
Phono inputs. RCA sockets.
Line inputs. RCA sockets.
Main outputs. RCA sockets.
Tape outputs. RCA sockets.
+ Please ensure that only qualified persons install and operate the PRO MIXER DX100. During
installation and operation the user must have sufficient electrical contact to earth. Electro-
static charges might affect the operation of the PRO MIXER DX100!
6. HEADPHONES, MONITORS & PFL