Digital Voice Research MAC 3 User manual

COMPACT ACTIVE SPEAKER
250 W RMS MOSFET POWER AMPLIFIER
AUDIO PROCESSOR
ELECTRONIC LIMITER
USER’S MANUAL
GB
CODEM MUSIC S.r.l. - Via G.Pierini, 13 - 61100 PESARO - ITALY
Tel. [phone] - Fax [phone]
hhttttpp::////wwwwww..ccooddeemmmmuussiicc..ccoomm--EE--mmaaiill::iinnffoo@@ccooddeemmmmuussiicc..ccoomm
MK2

DESCRIPTION
The MAC 3 is a very compact and innovative two-way active speaker that
can ensure an absolute sound quality in any use conditions.
The MAC 3 incorporates a powerful and reliable 250 Wrms power
amplifier with MOS-FET technology designed for making a dynamic and clear
sound, along with a music quality without equal.
The dynamics of trasducers is maximized by the AUDIO SIGNAL
PROCESSOR and the ELECTRONIC LIMITER and it at the same time pro-
tected from signal peaks and distorsion wich could compromise its lenght.
Thanks to the trasducers quality, the high technological content of its incor-
porated power amplifier, the MAC 3 meet the strict demand of PA system
and professional monitoring for any musical instrument or genre.
The particular construction of its back part, with two 45° sides allow the
MAC 3 to be used as a monitor.
USE OF BALANCED INPUTS
MAC3 inputs are BALANCED type, 3 poles XLR CANNON and JACK stereo.
Balanced connection is studied to have a better rejection against the noise
that wires (if very long) takes from external interferences.
Most of professional audio equipment have balanced outputs, you can use
however non balanced connection with mono JACK (or 3 poles CANNON
with pin 3 connected to pin 1) the MAC3 will work normally, but it will be
more sensitive to external interferences.
The JACK and CANNON inputs are connected together (parallel / link).
You can use each one like an input or an output signal for other speaker
systems.
USE OF INPUTS LEVEL
Volume knob adjust the input level of the two inputs.
Normally is preferred to take the knob on the 0 dB level, if you want a
higher sensibility you can take the knob to MAX.
Electronic internal limiter will always control input level to have a safe
operation of the trasducers.

USEFUL TIPS
Thanks to its characteritics you can use MAC 3 for monitoring and sound diffusion or like
sound system for piano-bar and live music.
MAC 3 has been build for vertical, horizontal and 45° installation (like a monitor).
On the bottom of the cabinet there is the adapter for speaker stand.
DESCRIPTION OF REAR PANEL
1) Power supply 220/240 Vac 50/60 Hz
2) Power switch with lamp (0 -1)
3) Protection fuse
4) Balanced line input - 3 poles XLR cannon
5) Balanced line input - stereo jack
6) Input level adjutment
NOTE:
The two inputs are parallel connected
together, you can use one for input and
the other like an output for other speaker
systems.
In case of internal amplifier over-heating,
the heat-protection turn off the MAC3, when
the temperature return to normal level,
automatically the protection turn on again
the system.
Input level higher than +10 dB can
damage the speaker system.
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6
4
1
3
2

TECHNICAL SPECIFICATION
Type Bass - reflex / 2 way
Low frequency section 250 mm (10”) high efficiency
High frequency section 1“ horn loaded compression driver
Sensitivity 1W/1m 102 dB
Angle of coverage 90° x 60° (horn directivity)
Frequency response 48 - 20.000 Hz
Crossover 12 dB/oct.
Cabinet High density wood covered with moquette
Dimensions Cm 48 x 35 x 32,5 (H - L - W)
Weight Kg. 22
TECHNICAL SPECIFICATION AMPLIFIER
Type AB class mosfet with audio signal processor
Output power 250 W R.M.S. / 4 Ohm
THD < 0,1 % a 1 Khz
Frequency response 20 - 50.000 Hz
Balanced inputs XLRF + stereo Jack in parallel
Input sensitivity 0 dB / -7 dB max
Input impedance 10 KOhm
Protections
Electronic limiter on the input signal (max +10 db)
Protection fuse on power supply (1 x 4AF)
Double protection fuse on power amplifier (2 x 8AF)
Self-resetting thermal fuse on transformer and power amplifier