Mackie FR2500 Manuale Utente

Owner’

s Manual

These inputs allow you to connect balanced XLR 

plugs.

These are wired conventionally, with pin 2 hot, pin 3 

cold and pin 1 ground.

These inputs allow you to connect balanced 1/4" TRS 

or unbalanced TS plugs from line-level sources. 

Use balanced connections where possible, as these 

offer better rejection of noise than unbalanced lines.

Use high-quality, three-conductor shielded cable for 

balanced connections. The better the shield, the better 
the audio signal is protected from induced EMI and RFI.

Turn this switch on to engage a low-frequency cutoff 

(high-pass) filter at 30 Hz. The frequency range below 
30 Hz is attenuated. 

The amplifiers can amplify signals below 20 Hz, but 

most speakers can’t reproduce frequencies that low.

By engaging the SUBSONIC FILTER, you allow the 

amplifier to power only the frequencies you can hear. 
In addition, this filter can reduce low-frequency stage 
noise (footsteps) and accidental microphone pops that 
could damage a loudspeaker.

Leave this off if you are powering a subwoofer, or if 

your speakers can reproduce low frequencies such as 
the kick drum range.

When engaged, the CLIP LIMIT switch protects your 

loudspeakers from the effects of clipping. It is designed 
to be virtually transparent, meaning you probably won’t 
even notice any audible difference when the switch is 
turned on. 

We recommend that you leave this switch on at all 

times. However, if you are working at quiet levels, or you 
have already placed a compressor/limiter in the signal 
path, you can leave the CLIP LIMIT switch off.

This switch determines the input signal routing 

within the amplifier. For most applications, you will 
use the STEREO setting. However, some applications 
might be better suited for using either the MONO or the 
BRIDGE setting.

STEREO: This is the normal position used when 

amplifying stereo signals. This mode accepts separate 
left and right inputs (1 and 2), and routes them to the 
CHANNEL 1 and CHANNEL 2 outputs. Each channel’s 
Level control adjusts the gain for its own channel, and 
each channel is independent.

MONO: This mode is used when you want to send a 

mono signal to both outputs. It accepts a single input 
(INPUT 1), and routes it to both the CHANNEL 1 and 
CHANNEL 2 outputs. Each channel’s Level control 
adjusts the gain for its own channel.

BRIDGE: This mode accepts a single input (INPUT 

1), and uses both amplifier outputs to double the power 
to one speaker. Use the Channel 1 Level control to 
adjust the gain (turn the Channel 2 Level control all the 
way down). The hookup diagrams show how to connect 
a speaker in Bridge mode.