Mackie ProFX4v2 オーナーマニュアル

Owner’

s Manual

This 5-band graphic equalizer adjusts the main  

mix output. It affects the line-level outputs, but not  
the headphones or tape outputs. This EQ may be used 
for a monitor mix instead of the main mix if the main 
mix/mon 1 switch is engaged. It may also be quickly 
bypassed using the EQ in/bypass switch.

Each slider allows you to adjust the level of its  

frequency band, with up to 15 dB of boost or cut,  
and no change in level at the center (0 dB) position. 
The frequency bands are: 80 Hz, 250 Hz, 800 Hz,  
2.5 kHz and 8 kHz.

The EQ section comes before the main mix level  

and meters. As with the channel EQ, just take it easy. 
There is a large amount of adjustment, and if you  
are not careful, you can upset the delicate balance  
of nature. Although it may not seem cool to actually  
turn down controls, with EQ it is often the best option. 
Turn down the offending frequency range rather than  
boosting the desired range. You may use it to reduce the 
level of some frequency bands where feedback occurs.

This switch allows you to choose if the stereo  

graphic EQ is used for the stereo left and right main  
mix or if it is used for monitors. For example, there  
may be times when the graphic EQ may be used wisely 
in the monitor mix to reduce feedback in the monitors 
from nearby microphones.

This switch allows you to quickly engage or  

disengage the stereo graphic EQ. This may be used  
for quick checks of your EQ settings, or to shorten  
the signal path if you do not need to use the EQ.

These peak meters are made up of two columns  

of twelve LEDs, with three colors to indicate different 
ranges of signal level, traffic light style. They range  
from –30 at the bottom, to 0 in the middle, to +20 (OL)  
at the top.

When 0 dBu (0.775 V) is at the main left and right 

TRS outputs, it shows as 0 dB on the meters.

You can get a good mix with peaks flashing anywhere 

between –20 and +10 dB on the meters. Most amplifiers 
clip at about +10 dBu, and some recorders aren’t so 
forgiving either. For best real-world results, try to keep 
your peaks between “0” and “+6.” Remember, audio  
meters are just tools to help assure you that your levels 
are “in the ballpark.” You don’t have to stare at them 
(unless you want to).

This LED will illuminate green when the mixer is 

turned on, as a reminder of how on it really is. If it is 
not on, then it is off, and the mixer becomes a rather 
nice weight for keeping your morning newspaper from  
blowing away in the wind.

If it does not turn on, make sure the AC adaptor is 

correctly inserted at both ends, the local AC mains   
supply is active, and the power switch is on.

Most modern professional condenser mics require 

48V phantom power, which lets the mixer send low-
current DC voltage to the mic’s electronics through the 
same wires that carry audio. (Semi-pro condenser mics 
often have batteries to accomplish the same thing.) 
“Phantom” owes its name to an ability to be “unseen” 
by dynamic mics (Shure SM57/SM58, for instance), 
which don’t need  external power and aren’t affected by 
it anyway.

Press this switch in if your microphone requires  

phantom power. (Always check the position of  
this switch before connecting microphones.)  
The accompanying LED will illuminate red to indicate 
that phantom power is active. This is a global switch 
that affects all mic channels' XLR jacks at once.

Never plug   single-ended (unbalanced)  
micro phones, or ribbon mics into the  
mic input jacks if phantom power is on.  

Do not plug instrument outputs into the mic XLR  
input jacks with phantom power on,  unless you know  
for certain it is safe to do so. Be sure the main mix  
fader is turned down when connecting microphones  
to the mic inputs when phantom power is turned on,  
to prevent pops from getting through to the speakers.

48V

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