8
4.9. Effects: KILL, PUNCH.
The SMAC PRO40 have two groups of lever switches (15). Each group acts only on the
channel they are placed A or B. When the switches are used, the selected frequency range is
instantaneously eliminated. So, it is possible to mix the bass of a song (by eliminating the medium and
treble) with the medium and treble (by eliminating the bass) of another song.
The PUNCH switches (13) are also instantaneous. The music is instantaneously inserted if
the crossfader is closed (opposite site of the switch pressed). The level of the punched channel
depends on the channel fader.
The combination of these elements offers an incredible fan of possibilities for your
creativity.
4.10. Outputs
Headphones: in order to obtain a high performance, these should be of the high
impedance type (200-600
). Plug them to the HEADPHONES, PHONES (16) output, by means of a
standard 1/4" stereo jack. Sleeve is Ground, Ring is Right Channel and Tip is Left Channel.
The SMAC PRO40 have two main outputs, OUT1 (29-30) and OUT2 (28) with independent
rotative volume controls. A Balance control (36), common to both outputs, completes the possibilities of
the mixers.
You must be careful when setting up the general output level of the mixer. The “clip”
display of the connected power amplifiers must never remain permanently lighten up, but do it
occasionally by following the rhythm of the bass signals that are being played.
The SMACs are factory adjusted to 0dB/1V, though this can be internally adjusted to -
10dBV/316mV, +4dBV/1,6V or +6dBV/2V (Fig.2). Just changing some soldering bridges.
ATTENTION: The modification of the output gain must be carried out by a qualified
technician.
The SMAC series mixers have a REC output (31) of -10dBV over 10k
of load for a
nominal level input.
5. CONSIDERATIONS
5.1. Ground loops
Ensure at all times that no signal sources reaching the mixing desk and no devices
connected to its output have their earths interconnected; that is, earth should never reach them via
two or more different paths, as this coul lead to humming which could even interfere with sound
reproduction quality. In order to avoid earth loops, ensure that the shieldings of cables, if connected
to the chassis, are never connected with each other.
5.2. Audio connections
As a general rule of thumb, make the signal connections as short as possible and use the
best connectors and cable available. Cables and connectors are frequently undervaluated, forgetting
that a bad connection can result in a poor sound quality.
