4
• The connecting wire between the amplifier
outputs and the drivers are kept to an
absolute minimum, so the damping factor of
the amplifier isn’t compromised by the
resistance of long speaker cables.
• The acoustic sum of the outputs from the two
drivers are optimized electronically, as well as
physically, so the amplitude response is unity
and the phase difference is minimal.
In short, all the complex interconnected
components in the system are designed to work
in harmony with each other to produce the best
possible sound.
The Transducers...
The monitors feature an 6.7-inch die-cast
magnesium frame woofer and a 1-inch viscous
edge-damped aluminum-alloy dome tweeter on
the front, and a 6-inch x 9-inch elliptical flat pis-
ton passive radiator in the back.
The high-frequency driver is mounted on a
massive, acoustically non-resonant die-cast zinc
QUICK START
We realize that you can’t
wait to hook up your new
Mackie Designs HR624
High Resolution Studio
Monitors and try them out.
Nevertheless, please take the time to read this
page NOW, and the rest can wait until you’re
good and ready.
Make sure the Voltage
Selector Switch
on the
bottom of the cabinet is set
to the correct voltage setting
for your AC Mains supply.
Each of the HR624 cabinets has its own built-
in power amplifiers. That’s right, two amplifiers
per speaker cabinet; one for the high-frequency
tweeter and one for the low-frequency woofer.
You should turn the
INPUT SENSITIVITY
control on the back of the cabinet
down
(fully
counterclockwise) before turning on the Studio
Monitors for the first time. Also be sure to set
the mute switch
on the front panel to its
standby position (in). This will prevent you
from accidentally connecting a hot signal source
to the monitors and getting a rude surprise.
There are a number of other settings you
can make on the back of the HR624, and you
can look at the graphic instructions relating to
each of them on the back of the cabinet (or
wait until you read about them later on in this
manual so you really know what they do). For
now, just leave them at the factory default set-
exponential waveguide which results in wide,
controlled dispersion of high-frequency sounds.
The unique passive radiator design provides a
smooth response down to 49Hz — an astounding
accomplishment for a cabinet of this size! And
since the radiator is producing most of the sound at
the lowest frequencies, there is very little distortion
from the woofer because its cone movement is
minimal at those frequencies.
The Cabinet...
The cabinet is made of black oak veneered
MDF wood. An internal “H” brace further increases
the strength and rigidity (stiffness) of the box.
An open-cell adiabatic foam material fills the in-
side of the box to absorb internal reflections and
dampen standing waves.
Power Amplifiers...
The low-frequency amplifier produces up to
100 watts continuous before clipping, while the
high-frequency amplifier produces up to 40 watts
continuous.
tings (
ACOUSTIC SPACE = WHOLE; LOW
FREQ = 49Hz; HIGH FREQ = 0
), except for
the
POWER MODE
switch. Be sure it is set
to the
STANDBY
position.
1. Connect the line-level monitor signal from
your mixer, preamp, or other signal source
to the
SIGNAL INPUT
jack on the
HR624 Studio Monitor (
1
⁄
4
-inch
PHONE
,
XLR
, or
RCA
).
2.
Connect the supplied AC power cord to the
IEC socket
on the back of the monitor.
Plug the other end into an AC outlet properly
configured with the voltage corresponding
to the Voltage Selector Switch
setting.
3.
Set the
POWER MODE
switch on the
rear panel to the
ON
position. With the
front panel mute switch
depressed, the
power amplifier is in Standby mode.
4.
Start your signal source (tape deck, CD, DAW,
or whatever), but leave the master volume
control on your mixer or preamp down.
5.
Set the mute switch
on the front of the
HR624 to the OUT position. The green
power
LED will turn on.
6.
Slowly turn up the
INPUT SENSITIVITY
control on the back of the monitor to its
fully clockwise position
(NORMAL)
.
7.
Adjust the master volume on your mixer to
a comfortably loud listening level. Enjoy
the silky smooth highs and authoritative,
commanding lows of the HR624.
Then read the rest of this manual.
