HR624 MK2
High Resolution Active Studio Monitor
OWNER’S MANUAL
HR624 MK2
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions. 13.Unplug this apparatus during lightning storms or when unused for long
periods of time.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth. Use a non-scratch cloth to protect the finish.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type
plug. A polarized plug has two blades with one wider than the other.
A grounding-type plug has two blades and a third grounding prong.
The wide blade or the third prong are provided for your safety. If the
provided plug does not fit into your outlet, consult an electrician for
replacement of the obsolete outlet.
10.Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.
11.Only use attachments/accessories specified by the manufacturer.
12.Use only with a cart, stand, tripod, bracket, or
table specified by the manufacturer, or sold with
the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to
avoid injury from tip-over.
CAUTION
PORTABLE CART
WARNING
AVIS
RISK OF ELECTRIC SHOCK. DO NOT OPEN
RISQUE DE CHOC ELECTRIQUE. NE PAS OUVRIR
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL
ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE, NE PAS ENLEVER LE COUVERCLE.
AUCUN ENTRETIEN DE PIECES INTERIEURES PAR L'USAGER.
CONFIER L'ENTRETIEN AU PERSONNEL QUALIFIE.
AVIS: POUR EVITER LES RISQUES D'INCENDIE OU D'ELECTROCUTION, N'EXPOSEZ PAS CET ARTICLE
A LA PLUIE OU A L'HUMIDITE
The lightning flash with arrowhead symbol within an equilateral triangle is
intended to alert the user to the presence of uninsulated "dangerous
voltage" within the product's enclosure, that may be of sufficient magnitude
to constitute a risk of electric shock to persons.
Le symbole éclair avec point de flèche à l'intérieur d'un triangle équilatéral
est utilisé pour alerter l'utilisateur de la présence à l'intérieur du coffret de
"voltage dangereux" non isolé d'ampleur suffisante pour constituer un risque
d'éléctrocution.
The exclamation point within an equilateral triangle is intended to alert the
user of the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the appliance.
Le point d'exclamation à l'intérieur d'un triangle équilatéral est employé
pour alerter les utilisateurs de la présence d'instructions importantes pour le
fonctionnement et l'entretien (service) dans le livret d'instruction
accompagnant l'appareil.
14.Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as powersupply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.
15.This apparatus shall not be exposed to dripping or splashing, and no
object filled with liquids, such as vases, shall be placed on the apparatus.
16.Note that this apparatus is not completely disconnected from the AC
mains service when the power switch is in the OFF position.
17.The MAINS plug or an appliance coupler is used as the disconnect
device, so the disconnect device shall remain readily operable.
18.Exposure to extremely high noise levels may cause permanent hearing
loss. Individuals vary considerably in susceptibility to noise-induced
hearing loss, but nearly everyone will lose some hearing if exposed to
sufficiently intense noise for a period of time. The U.S. Government’s
Occupational Safety and Health Administration (OSHA) has specified
the permissible noise level exposures shown in the following chart.
According to OSHA, any exposure in excess of these permissible limits
could result in some hearing loss. To ensure against potentially dangerous exposure to high sound pressure levels, it is recommended that all
persons exposed to equipment capable of producing high sound pressure levels use hearing protectors while the equipment is in operation.
Ear plugs or protectors in the ear canals or over the ears must be worn
when operating the equipment in order to prevent permanent hearing
loss if exposure is in excess of the limits set forth here.
Duration,
per day in
hours
8
6
4
3
2
1.5
1
Sound Level
dBA, Slow
Response
90
92
95
97
100
102
105
0.5
110
0.25 or less 115
Typical Example
Duo in small club
Subway Train
Very loud classical music
Dave screaming at Steve about
deadlines
Loudest parts at a rock concert
WARNING — To reduce the risk of fire or electric shock, do not
expose this apparatus to rain or moisture.
Correct disposal of this product. This symbol indicates that this product should not be disposed of with your household waste, according to the WEEE Directive (2002/96/EC) and your national law. This product
should be handed over to an authorized collection site for recycling waste electrical and electronic equipment (EEE). Improper handling of this type of waste could have a possible negative impact on the environment and
human health due to potentially hazardous substances that are generally associated with EEE. At the same time, your cooperation in the correct disposal of this product will contribute to the effective usage of natural
resources. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, waste authority, or your household waste disposal service.
HR624 MK2
Thank you for choosing the Mackie HR624 MK2 Studio
Monitors. We began producing the original HR624
Studio Monitors in 2001, the baby brother to our flagship
HR824 Studio Monitors. The HR624 MK2s have been
redesigned with modern components for improved accuracy and an extended low-frequency response.
Investments in Excellence...
When we decided it was time to update the HR624s,
we turned to our expert loudspeaker and transducer design engineering team at EAW to determine how to make
an already excellent studio monitor even better. The
first thing they noticed was that the front baffle could
be redesigned with a rounder aluminum construction
to further reduce edge diffraction for improved imaging. The volume of the cabinet was increased slightly to
improve the low-frequency response. The amplifiers have
been adjusted with all new ‘voicing’ to match the new
cabinets. However, the amplifiers’ design is fundamentally the same and has a very similar characteristic to the
original model. If you are upgrading from the original
HR624s, you won’t have to relearn the sound. The MK2s
still deliver the clarity, ultra-linear frequency response,
and broad stereo imaging of the originals.
An elegant piano-black gloss finish emphasizes that
these studio monitors are in a class by themselves,
pleasing to the most discerning eye as well as the most
discerning ear.
The result? The HR624 MK2 Studio Monitors are
extremely accurate and versatile, loaded with unique controls that allow you to fine-tune the sound to match your
individual environment precisely. You’re gonna love these!
What are they? The Advantages...
• The crossover point is designed so that the
high- and low-frequency drivers are fed
only the frequencies they are best able to
reproduce.
Woofer
Tweeter
The HR624 MK2 Studio Monitors are high-resolution,
two-way, bi-amplified, active monitors employing a 6th-order Butterworth system with a
built-in rear-firing mass-loaded passive radiator. Whew! There are many benefits to integrating an active crossover, power amplifiers, and
drivers into a single cabinet, and we’ve taken
full advantage of these benefits in the design of
the HR624 MK2.
• The amplifiers are designed to provide maximum
acoustic output from the speakers, yet minimize
the danger of speaker damage due to overdriving.
• In addition, the amplifiers’ gain and frequency responses are individually hand-trimmed to compensate for typical manufacturing tolerances between
the drivers and produce a smooth frequency
response from 45 Hz to 20 kHz.
Owner’s Manual
INTRODUCTION
• The connecting wires 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 a 6.7-inch high-precision, lowdistortion woofer and a 1-inch ferrofluid cooled titanium
dome tweeter on the front, and a 6-inch x 9-inch elliptical flat piston passive radiator in the back.
The high-frequency driver is mounted on a massive,
acoustically non-resonant die-cast aluminum exponential waveguide, which results in wide, controlled
dispersion of high-frequency sounds. The unique passive radiator design provides a smooth response down to
45 Hz — 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.
Passive Radiator
Power Amplifier/
Crossover Assembly
Figure 1. HR624 MK2 Cutaway side view
Owner’s Manual
HR624 MK2
The Cabinet...
The cabinet is made of MDF with a high-gloss pianoblack finish. Internal bracing increases the strength and
rigidity (stiffness) of the box. An open-cell adiabatic
foam material fills the inside of the box to absorb internal reflections and dampen standing waves. Mounting
hardware is installed on the bottom of the cabinet that
fits the WB-60 OmniMount wall-mount bracket.
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.
QUICK START
We realize that you can’t wait to hook
up your new Mackie HR624 MK2 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 [11] on the bottom of the
cabinet is set to the correct voltage
setting for your AC Mains supply.
Each of the HR624 MK2 cabinets has its own builtin 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 [2] 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 power switch [9] on the front panel to its
standby position (out). 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 MK2, 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
settings (ACOUSTIC SPACE = WHOLE; LOW FREQ =
49Hz; HIGH FREQ = 0), except for the POWER MODE
[6] switch. Be sure it is set to the STANDBY position.
HR624 MK2
1. Connect the line-level monitor signal from your mixer,
preamp, or other signal source to the SIGNAL INPUT
[1] jack on the HR624 MK2 Studio Monitor (1⁄4-inch
PHONE, XLR, or RCA).
2. Connect the supplied AC power cord to the IEC socket
[7] 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 [11] setting.
3. Set the POWER MODE [6] switch on the rear panel to
the ON position. With the front panel power switch [9]
out, 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. Push in the power switch [9] on the front of the HR624
MK2. The power ring [10] around the switch will illuminate.
6. Slowly turn up the INPUT SENSITIVITY [2] 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 MK2.
Then read the rest of this manual.
AN EXTREMELY IMPORTANT NOTE
ON HR624 MK2 BASS RESPONSE
AND YOUR CONTROL ROOM.
Your new HR624 MK2s achieve their
best bass ­response in a room that’s
optimized for bass ­reproduction. A
lot of factors can conspire to thwart
the HR624 MK2s’ extended low
frequency — including room shape, room volume and
­acoustical treatment.
This is not a cop-out or an apology. It’s plain old
physics in action. Luckily we’ve armed you with some
compensating controls that you can use to optimize the
frequency response of the speakers in your particular
room. Consider the following:
The ACOUSTIC SPACE switch
must be set correctly.
When you put your HR624 MK2s in a corner or up
against walls, their bass characteristics change. Adjust
the ACOUSTIC SPACE [3] switch setting accordingly to
avoid muddy or exaggerated low frequency response.
Owner’s Manual
QUARTER SPACE
HALF SPACE
CONSOLE
CONSOLE
SPEAKERS IN CORNERS
SPEAKERS AGAINST WALL
SPEAKERS AWAY
FROM WALLS
B
C
WHOLE SPACE
CONSOLE
A
ACOUSTIC SPACE APPLICATIONS
49Hz
10kHz
0dB
LOW CUT
0dB
+ 2dB
–2dB
–4dB
–3dB
80Hz
0dB
– 2dB
20
LOW FREQ
100Hz
ACOUSTIC SPACE
HIGH FREQ
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
–10dB
OFF
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
QUARTER
WHOLE (NORMAL)
A
C
NORMAL
B
HALF
INPUT
SENSITIVITY
80Hz
49Hz
LOW CUT
(NORMAL)
ACOUSTIC
SPACE
LOW
FREQ FILTER
–2dB
0
+2dB STANDBY
(NORMAL)
AUTO
ON
HIGH
FREQ FILTER
POWER
MODE
SIGNAL INPUTS BAL/UNBAL
PHONE
XLR
ON
MAINS INPUT
RCA
BOTTOM OF CABINET
120
Set the Voltage Selector
Switch to “120” for 120 VAC
mains, and to “240” for
220-240 VAC mains.
Owner’s Manual
HR624 MK2
Feel free to experiment.
Placement
In many respects, every room is unique in terms of its
acoustics.
The HR624 MK2s were designed to be placed in a
vertical position. If you find it necessary to place the
speakers in a horizontal position (on their sides), place
them so that the woofers are toward the inside; that is,
so the woofers are closest to each other. This provides
the best low-frequency summing and overall imaging.
Even after you’ve read about how to set the HR624
MK2’s rear panel switches, try other settings to see if
your particular room environment requires different
adjustments.
And, even after you’ve placed your monitors where you
think they’ll sound best, try moving them around. You
might be pleasantly surprised.
Finally, keep an open mind about
improving your room’s acoustics
and bass-handling ability.
Nobody likes to buy a new set of monitor speakers
and then be told that they should spend extra bucks on
bass traps or a remodeling job. But the simple fact is,
“standard” rooms, i.e., rectangular rooms in conventional business or residential structures, are rarely if ever
conducive to optimal low bass reproduction without
some modifications.
Luckily, there are plenty of options short of building
a new control room, many of which are covered in this
manual.
Additional Tidbits of Wisdom
• When you shut down your equipment, turn off the
HR624 MK2 studio monitors first to prevent thumps
and other noises generated by any upstream equipment
from coming out the speakers. When powering up, turn
on the monitors last.
• Save the shipping box! You may need it someday, and
you don’t want to have to pay for another one.
• Save your sales receipt in a safe place.
• Also record all HR624 MK2 serial numbers in the space
provided on the next page, along with where and when
you bought them.
HR624 MK2
The HR624 MK2s can also be wall-mounted using the
mounting hardware located on the bottom of the cabinet. This is designed to be used with the OmniMount
30.0 WB (Wall-to-Bottom) wall-mount bracket, which
provides a wide range of horizontal and vertical movement to meet your coverage requirements. Refer to the
OmniMount website for more details.
www.omnimount.com/pro
A Few Words About THX™ pm3™
Certification
Nearly two decades ago, George Lucas turned a
passion for great sound into the world’s most accepted
and trusted solution for achieving it. The standard was
named THX (for Tomlinson Holman, who developed
the THX Sound System when he was the research and
technical director at Lucasfilm Ltd.™ in the early 80s),
and today, with hundreds of thousands of home theater
customers and more than 3000 THX Certified movie theaters enjoying its benefits, the THX name has become
nothing short of legendary. Simply put: when it comes
to premium sound, no other name so closely defines
‘quality’ for millions of movie-goers and home theater
enthusiasts alike.
Today, a new landscape is emerging. A landscape comprised of hundreds of small, professional multi-channel
facilities, whose need for differentiation, expert technical and marketing support, and a true, multi-channel
Note: The Mackie logo can be rotated 90º so
that it is oriented correctly when placing the
speakers on their sides. Gently pull out on
the Mackie emblem, rotate it, and push it
back into place.
Contents
All facilities involved with mixing and/or monitoring
of multi-channel material should have the option to use
pm3. THX pm3 Certification is ideal for DVD mastering,
sweetening, and mixing; and is also perfect for facilities
doing work in broadcast, music, or multi-media applications.
IMPORTANT SAFETY INSTRUCTIONS............2
INTRODUCTION.................................................. 3
HR624 MK2 THX pm3 Certification
When we submitted the HR624 MK2s for THX pm3
Certification, they passed on the first try with no modifications!
Anyone seeking THX Certification for their studio,
or striving to maintain THX standards, can use the
HR624 MK2s and rest assured that their facility is in
full compliance.
QUICK START............................................................................ 4
REAR PANEL DESCRIPTION ..............................8
1. SIGNAL INPUTS................................................................ 8
2. INPUT SENSITIVITY......................................................... 8
3. ACOUSTIC SPACE............................................................. 8
4. LOW FREQ FILTER............................................................ 9
5. HIGH FREQ FILTER........................................................... 9
6. POWER MODE................................................................10
7. Mains Input......................................................................10
8. Passive Radiator..............................................................11
Owner’s Manual
standard is becoming a competitive fact of life. Again,
THX has a singular solution and this time it’s called
THX pm3 Certification.
FRONT PANEL DESCRIPTION...........................12
9. Power Switch...................................................................12
10. Power Ring and Overload Indicator.......................12
PROTECTION CIRCUITS.....................................12
Overload Protect ..............................................................12
Thermal Protect.................................................................. 13
Integrated Magnetic Shielding....................................... 13
Input Signal Wiring............................................................ 13
CARE AND CLEANING........................................13
SERVICE INFO.......................................................14
Troubleshooting.................................................................14
Repair.....................................................................................15
TECHNICAL INFORMATION............................ 16
HR624 MK2 Specifications..................................................16
Graphs....................................................................................17
HR624 MK2 Block Diagram..............................................18
• Please write the serial number for your studio monitor here
(all studio monitors if you have more than one) for ­future reference
(i.e., insurance claims, tech support, return authorization, etc.):
Monitor 3
Monitor 1
Monitor 2
Purchased at:___________________________________ Date of Purchase:_____________
Part No. SW0592 Rev. D 01/09
©2007-2009 LOUD Technologies Inc. All Rights Reserved.
Owner’s Manual
HR624 MK2
REAR PANEL DESCRIPTION
This is where you connect your signal to the monitor,
and make adjustments to the frequency response of
the speakers to match the monitor’s location and your
room’s environment.
2. INPUT SENSITIVITY
–10dB
For THX applications, the rear panel
switches and controls should be set
to the THX positions as indicated in
this section.
OFF
QUARTER
WHOLE (NORMAL)
A
C
NORMAL
80Hz
B
HALF
INPUT
SENSITIVITY
49Hz
LOW CUT
ACOUSTIC
SPACE
(NORM
LOW
FREQ FILTER
THX = NORMAL
1. SIGNAL INPUTS
The HR624 MK2 expects a line-level signal at its input
connectors.
The location of the signal input jacks makes the connectors exit down and not straight out the back of the
enclosure. This flush-mount design allows you to place
the monitor right up against the wall if desired.
• The XLR female, TRS female (balanced), and RCA
female (unbalanced) input connectors are provided for
user convenience.
• Don’t connect more than one source to the jacks.
• Unbalanced TS (tip-sleeve) lines can be accommodated
via the TRS jack. Make sure the cable terminates with
a TS plug (like a guitar plug), or if it’s a TRS plug (such
as a headphone plug), make sure the ring is tied to the
sleeve and that the plug is fully inserted into the jack.
• The XLR and TRS input connectors accept balanced or
unbalanced signals. The connectors are wired as follows
(per the AES/IEC standard):
XLR
TRS
RCA
Hot (+)
Cold (–)
Shield (Ground)
Pin 2
Pin 3
Pin 1
Tip
Ring
Shield
Tip
—
Shield
• The HR624 MK2s can be used with a home receiver
even if the receiver lacks a preamp output by using a
speaker-level to line-level signal attenuator. (See page
13 for more information.)
HR624 MK2
• The reference sensitivity is –7.5 dBu=100 dB SPL at
one meter (39 inches) with the INPUT SENSITIVITY
control set to its NORMAL position (in other words,
wide open).
• The HR624 MK2 is designed to operate with a +4 dBu
signal when the INPUT SENSITIVITY control is in the
NORMAL position.
• Refer to the QUICK START section on page 4 for the
level-setting procedure.
3. ACOUSTIC SPACE
–10dB
OFF
NORMAL
QUARTER
WHOLE (NORMAL)
A
C
B
HALF
INPUT
SENSITIVITY
ACOUSTIC
SPACE
80Hz
49Hz
LOW CUT
(NORMAL)
–2dB
LOW
FREQ FILTER
THX = WHOLE (NORMAL)
This is a three-way switch that ­adjusts the low-frequency
response of the monitors to compensate for their placement in the room. See page 5 for an overview of the rear
panel.
• If you place the HR624 MK2 monitors against a wall
(half space [3B]), set the ACOUSTIC SPACE switch
to the “B” position. This activates a shelving filter to
reduce the low-frequency output by 2 dB to compensate
for the half-space placement.
• If you place the monitors into the corners of your
room (quarter space [3A]), the low-frequency output
approximately doubles from what it is in half space.
Set the ACOUSTIC SPACE switch to the “A” position to
reduce the low-frequency output by 4 dB to compensate
for the quarter-space placement.
• If you use the HR624 MK2s free-standing, away from
walls and corners (whole space [3C]), set the ACOUSTIC SPACE switch to the “C” position (NORMAL).
0
+2dB
(NORMAL)
HIGH
FREQ FILTER
NORMAL
INPUT
SENSITIVITY
4. LOW FREQ FILTER
QUARTER
WHOLE (NORMAL)
A
C
B
HALF
ACOUSTIC
SPACE
–2dB
80Hz
49Hz
LOW CUT
(NORMAL)
+2dB
0
(NORMAL)
LOW
FREQ FILTER
HIGH
FREQ FILTER
THX = 80Hz–10dB
Removing the low-frequency content also allows
you to raise the overall output level somewhat. Lowfrequency information requires the largest amount of
an amplifier’s output, so restricting the low-frequency
allows raising the mid-frequency level someSTANDBY content
ON
AUTO
what.
If
your
client insists on mixing LOUD, this may be
ON
a workable strategy.
POWER
MODE
5. HIGH FREQ FILTER
QUARTER
WHOLE (NORMAL)
A
C
The LOW FREQ FILTER switch inserts a low-frequency rolloff into the response curve.
OFF
NORMAL
80Hz
B
49Hz
–2dB
0
+2dB STANDBY
ON
• For some applications, the low-frequency output of the
(NORMAL)
LOW CUT
(NORMAL)
AUTO
HALF
ON
HR624 MK2 may impair your ability to make mix judgeINPUT
ACOUSTIC
LOW
HIGH
POWER
ments.
SENSITIVITY
SPACE
FREQ FILTER
FREQ FILTER
MODE
• For THX applications, use the 80Hz setting.
THX = 0 dB
• For non-THX applications where a sub-woofer isn’t enhancing low-frequency output use the 49Hz (NORMAL)
The HIGH FREQ FILTER switch tailors the overall
position.
high-frequency response by ±2 dB beginning at 10kHz.
Leave this switch in the 0 (NORMAL) position unless:
• The LOW FREQ switch affects the low-frequency content of your mix. Remember how things work in reverse,
to subtly
brighten or darken the sound of the
SPACE
SPACE
so removing the deep bass content QUARTER
on playback
may HALF SPACE• You want WHOLE
speakers.
CONSOLE
actually increase it in the final mix. CONSOLE
CONSOLE
•
Perhaps you
have hearing loss caused by too many
• You can use the LOW FREQ switch’s 80Hz position to
nights in front of a double Marshall stack.
simulate a smaller loudspeaker, especially one with
A
B
•
You just likeCto mix on the bright side or dull side.
limited low-frequency capability (like a certain popular
ACOUSTIC SPACE APPLICATIONS
If your mixes consistently sound dull or dark when
2-way nearfield monitor). You may need to do this if a
you
listen elsewhere, this usually indicates that your
small speaker is the eventual destination of your mix,
0
monitors 02are too bright, relative to your normal hearing.
0
or perhaps just to see how your –mix
sounds on a clock
–2
3
–4
A bit less–2high-frequency energy usually fixes this, and
radio.
you can force the mix in this direction by reducing the
LOW FREQ
ACOUSTIC SPACE
HIGH FREQ
high-frequency
output of the monitors by using the –2 dB
position of the switch.
SPEAKERS IN CORNERS
SPEAKERS AWAY
FROM WALLS
SPEAKERS AGAINST WALL
LOW CUT
10kHz
dB
dB
dB
+ dB
dB
dB
dB
49Hz
80Hz
Owner’s Manual
OFF
–10dB
dB
20
100Hz
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
–10dB
OFF
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
QUARTER
WHOLE (NORMAL)
A
C
NORMAL
B
HALF
INPUT
SENSITIVITY
80Hz
49Hz
LOW CUT
(NORMAL)
ACOUSTIC
SPACE
LOW
FREQ FILTER
SIGNAL INPUTS BAL/UNBAL
PHONE
XLR
–2dB
0
+2dB STANDBY
(NORMAL)
AUTO
ON
HIGH
FREQ FILTER
POWER
MODE
ON
MAINS INPUT
RCA
Owner’s Manual
HR624 MK2
Conversely, if your mixes are consistently too bright,
QUARTER
WHOLE (NORMAL)
–10dB
then adding some additional high-frequency
energy in
A
C
the monitors satisfies your ears, and the resultant mix
has less HF content.
OFF
NORMAL
80Hz
49Hz
–2dB
0
+2dB STANDBY
ON
B
The timbre of your monitors
affects
(NORMAL)
LOW CUT
(NORMAL)
AUTO
HALF
ON
the way that your mixes play on other
INPUT
ACOUSTIC
LOW
HIGH
POWER
equipment. Remember
SENSITIVITY
SPACE that the moniFREQ FILTER
FREQ FILTER
MODE
tors have a mirroring effect on the
This 3-position switch turns the amplifiers on or off, or
mix; if the monitors make something
sets
them to automatic mode. Use this switch to set the
too loud in the mix it usually results in not enough of
HR624 MK2s to your preferred mode of operation, and
that thing on tape.
use the front panel power [9] switch for convenience.
Start with the response modification switches in the
• In the STANDBY position, the power amplifiers are in
factory recommended settings (see Quick Start SecStandby mode and produce no sound. Low-level circuitry
tion). After prolonged listening, if you notice a trend in
is still active, but the power consumption of the ciryour mixes, perhaps making some small adjustments as
cuitry is minimal (12 watts).
suggested here will help.
• Flip the switch to the ON position and the power ampliIt’s a real rush to mix really loud. But remember that
fiers are live and operate normally. (The front panel
the resulting mix only sounds good when you play it at
power [9] switch must also be IN.)
least that loud. However strange it may sound, mixes
• When it’s in the AUTO ON position, the amplifiers turn
made at lower levels sound even better when played
on and off depending on the presence or absence of an
loud; perhaps even a bit bigger than life.
input signal. An input signal level of –74 dBu (miniGet that sound level meter out. Decide what level
mum) activates the auto-on function. A silent period
you’re going to mix at and use the meter to help keep
greater than eight minutes activates the auto-off funcyour mixing at that level. Your ears will thank you, and
tion. The power ring [10] on the front panel reflects the
your mixes will be better for it.
state of the amplifiers.
QUARTER SPACE
HALF SPACE
CONSOLE
CONSOLE
SPEAKERS IN CORNERS
SPEAKERS AGAINST WALL
SPEAKERS AWAY
FROM WALLS
A
B
C
WHOLE SPACE
CONSOLE
ACOUSTIC SPACE APPLICATIONS
49Hz
10kHz
0dB
LOW CUT
0dB
+ 2dB
–2dB
–4dB
–3dB
80Hz
0dB
– 2dB
20
LOW FREQ
100Hz
ACOUSTIC SPACE
HIGH FREQ
WARNING:
TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT
EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. DO NOT REMOVE COVER.
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
RISK OF ELECTRIC SHOCK
DO NOT OPEN
–10dB
QUARTER
OFF
NORMAL
C
B
HALF
INPUT
SENSITIVITY
AVIS: RISQUE DE CHOC ELECTRIQUE — NE PAS OUVRIR
WHOLE (NORMAL)
A
80Hz
49Hz
LOW CUT
(NORMAL)
ACOUSTIC
SPACE
LOW
FREQ FILTER
SIGNAL INPUTS BAL/UNBAL
PHONE
10
6. POWER MODE
HR624 MK2
XLR
–2dB
0
+2dB STANDBY
(NORMAL)
AUTO
ON
HIGH
FREQ FILTER
POWER
MODE
ON
MAINS INPUT
RCA
8. Passive Radiator
When you mount a loudspeaker in a box, there are two
things that you can do with the radiation from the rear of
the cone: use it to enhance the low‑frequency performance
of the speaker system (bass reflex system) or soak it up
(acoustic suspension system).
• A bass reflex system uses the rear radiation to extend
the low-frequency response. Most systems provide holes
(ports) in the front or back of the cabinet to release the
rear wave. Sometimes the holes have tubes (ducts) in
them. The dimensions of the holes and the volume of
the cabinet work with the characteristics of the woofer
to produce low-frequency extension. These systems are
characterized by good low-frequency performance down
to the –3 dB frequency set by the design. Below this
frequency, the frequency response falls at 24 dB/octave
or more.
The HR624 MK2 is a bass reflex 6th-order system.
Rather than use ports, the vent takes the form of a passive radiator, a mass-loaded flat piston coupled to the air
trapped within the enclosure. You can’t see the passive
radiator because it is located at the rear of the cabinet,
behind the power amplifier assembly.
• One primary advantage of a passive radiator is that it
can reproduce low frequencies with lower distortion
and at a higher sound pressure level (SPL) than a
simple port or duct.
• Our unique passive radiator design uses a flat diaphragm providing exceptional stiffness to the radiating
surface.
• The elliptical shape of the passive radiator takes up
nearly the entire surface area available on the rear of
the enclosure, allowing the passive radiator to move
more air than a port.
Passive Radiator
Tweeter
• When the POWER MODE [6] switch is in the ON
­position (and the front panel power switch [9] is in the
IN position), applying AC power activates the muting
circuit for about four seconds while the power supply
and internal circuitry stabilize, then the HR624 MK2
unmutes and is ready to go.
Woofer
Connect the power cord to this IEC socket, and plug
the other end into your AC outlet.
• Simple ports or ducts must have sufficient surface
area to prevent the velocity of the air within them from
exceeding 5% of the speed of sound, which keeps the
vent from becoming audible (breathing and wheezing
sounds) at high signal levels.
• This requirement for sufficient surface area creates a
design problem when using ports — finding enough
space in the enclosure for them to fit.
The passive radiator replaces the port found on most
speaker systems. It offers several advantages to simple
porting:
Owner’s Manual
7. Mains Input
Owner’s Manual
11
HR624 MK2
FRONT PANEL DESCRIPTION
9. Power Switch
QUARTER
10dB switch
Use –this
to turnWHOLE
on or(NORMAL)
off the HR624 MK2 from
A
C
the front. It works with the POWER MODE [6] switch
on the rear panel in the following way:
+2dB
0
OFF
80Hzpanel is
49Hz
• If
theNORMAL
POWER MODE Bswitch on the rear
set –2dB (NORMAL)
LOW CUT
(NORMAL)
HALF
to STANDBY, the front
panel power [9] switch has no
INPUTThe powerACOUSTIC
HIGH
effect.
[10] ring remains off. LOW
SENSITIVITY
SPACE
FREQ FILTER
FREQ FILTER
• If the POWER MODE switch is ON, the front panel
power switch turns the HR624 MK2 on or returns it to
STANDBY mode, as indicated by the power ring.
• If the POWER MODE switch is in the AUTO ON position, the front panel power switch turns the HR624 MK2
on, even when there is no signal present. If there is no
signal after about two minutes, the auto-off function
is activated and the amplifiers go into Standby mode,
indicated when the power ring goes off.
STANDBY
ON
AUTO
ON
POWER
MODE
10. Power Ring and Overload Indicator
The power ring around the power switch illuminates
when the power amplifiers are on, and turns off when
the amplifiers are in Standby mode or off.
The power ring turns red when the overload protection circuit has been triggered.
• Occasional blinking of the overload indicator means
that the loudest transients are reaching the maximum
drive capability of the amplifiers. This is okay, although
distortion may be audible.
• Frequent or continuous blinking of the overload indicator means that you have exceeded the maximum drive
allowed for the speakers. The amplifiers are clipping,
and the overload protection circuit has taken over, reducing the input level. You should reduce the level from
your signal source until the overload indicator blinks
occasionally or not at all.
PROTECTION CIRCUITS
There are a number of protection mechanisms designed into the HR624 MK2 to safeguard the loudspeakers from inadvertent damage.
CAUTION: The protection circuits are designed to
prevent damage to the loudspeakers under reasonable
and sensible conditions. Should you choose to ignore
the warning signs (i.e., frequent overload indications,
excessive distortion), you can still damage the speakers
in the HR624 MK2 by overdriving them. Such damage is
beyond the scope of the warranty.
12
HR624 MK2
Overload Protect
• If you see the overload indicator [10] blinking more
than just occasionally, it’s an indication that you should
reduce the signal level coming from your mixer or other
signal source.
• The blinking overload indicator means the driver
thermal overload protection has activated a compressor.
This reduces the input level to the amplifiers.
• The compressor was designed to protect the speakers
and its action is highly audible.
If a client insists on listening to the
monitors at a very high volume, you
may find that the overload indicator
lights frequently. Since the majority of
the power requirement in any monitor
are the low frequencies, selectively reducing the low
end can provide a little more headroom and volume
for the monitors. Change the LOW FREQ FILTER [4]
switch to 80Hz if necessary, to reduce the bass response.
This may allow the HR624 MK2s to play just enough
louder to satisfy the client and to eliminate most of the
amplifier clipping.
All amplifiers produce heat. The HR624 MK2 is designed to be efficient both electrically and thermally.
• If for some reason the heatsinks get too hot, a thermal
switch activates, placing the HR624 MK2 into Standby
mode (indicated when the power ring [10] turns off).
• Should this happen, make sure that airflow to the rear
of the cabinet is not restricted.
• When the heatsinks cool down to a safe temperature,
the switch ­resets and normal operation resumes.
Integrated Magnetic Shielding
The HR624 MK2 Studio Monitor contains drivers
with large magnet structures. The drivers’ magnets are
shielded to help prevent the magnetic field from radiating out into the environment and playing havoc with
computer monitors or TV screens. Unshielded speakers
can cause distortion in both the shape and color of the
picture if placed too close to a CRT (cathode ray tube).
If you have a particularly sensitive computer monitor or
TV screen, it may be necessary to move the speakers a
few inches away.
CARE AND CLEANING
Remove the protective plastic film that encases the
cabinet.
Note: You may leave the protective
plastic film on the cabinet if you
wish, or you can remove all but the
side that will be in contact with the
surface it is sitting on to protect the
finish. Also, you should save the protective plastic film
to reapply to the cabinet in case you need to move it to
another location (or return for servicing).
Owner’s Manual
Thermal Protect
The piano-black finish on the HR624 MK2 cabinets is
exceedingly beautiful, yet extremely delicate. Clean the
outside of the cabinet with an optical grade non-scratch
cloth, such as you would use to clean eyeglasses, CDs, or
DVDs.
Input Signal Wiring
You should use high-quality, shielded cable to connect
the signal source to the SIGNAL INPUT jack [1] on the
HR624 MK2.
• Foil shielded cables, such as Belden 8451, 8761, or 9501
are commonly used for studio wiring.
• Microphone cables work well.
• The better the shield, the better the immunity from
externally induced noise (like EMI and RFI). Route the
cable away from AC power cords and outlets. These are
common sources for hum in an audio signal. Wall warts
and line lumps are especially insidious hum inducers!
You can purchase quality cables from your Mackie
dealer.
• In certain home theater applications, it may be necessary to connect the speaker outputs from a stereo
receiver to the inputs of the HR624 MK2s, if the receiver
doesn’t have preamp outputs or other line-level output
connections.
CAUTION: Do not attempt to connect a speaker output directly to the
input of the HR624 MK2! Speaker
levels are much higher than line levels and can damage the input circuitry
in the HR624 MK2.
You can, however, insert a speaker-level to line-level
signal attenuator between the receiver’s speaker output
and the HR624 MK2’s input. Your Mackie dealer may be
able to help you find one, or you can build your own.
Owner’s Manual
13
HR624 MK2
SERVICE INFO
If you think your Mackie product has a problem,
please check out the following troubleshooting tips and
do your best to confirm the problem. Visit the Support
section of our website (www.mackie.com/support)
where you will find lots of useful information such as
FAQs, and documentation. You may find the answer to
the problem without having to send your Mackie product away.
Troubleshooting
No Power
• Our favorite question: Is it plugged in?
• Make sure the power cord is securely seated in the IEC
socket [7] and plugged all the way into the AC outlet.
• Make sure the AC outlet is live (check with a tester or
lamp).
• Is the power [9] switch on the front panel pushed in
and the POWER MODE [6] switch on the rear panel in
the ON position?
• Is the power ring [10] on the front panel illuminated?
If not, make sure the AC outlet is live. If so, refer to “No
Sound” below.
• If the power ring is not illuminated, and you are certain
that the AC outlet is live, it will be necessary to have
the HR624 MK2 serviced. There are no user-serviceable
parts inside. Refer to “Repair” at the end of this section
to find out how to proceed.
No Sound
• Is the power ring [10] on the front panel illuminated? If
not, refer to “No Power” above.
• Is the INPUT SENSITIVITY [2] control turned up?
• Is the signal source turned up? Make sure the signal level
from the mixing console (or whatever device immediately precedes the studio monitor) is high enough to
produce sound.
• If it’s a stereo pair, try switching them around. For
example, if a left output is presumed dead, switch the
left and right cords at the monitor end. If the problem
switches sides, it’s not the monitor. It could be a bad
cable, or no signal from the mixer.
14
HR624 MK2
Bad Sound
• Is the input connector plugged completely into the
jack? If using a 1⁄4" TS or TRS plug, make sure it is
plugged all the way in.
• Is it loud and distorted? Reduce the signal level at the
mixer.
• If possible, listen to the signal source with headphones
plugged into the preamp stage. If it sounds bad there,
it’s not the monitor.
• Too much bass or not enough bass? Move around the
room and see if the bass response changes. It’s possible
your listening position coincides with a room mode
where the low frequencies either become exaggerated
or nulled. If so, try moving the monitors to a different
position, or moving your listening position.
Noise/Hum/Buzz
• Check the signal cable between the mixer and the
monitor. Make sure all connections are secure. These
problems usually produce crackling noises, hum, or
buzz.
• If connecting an unbalanced output to the HR624 MK2
balanced input, make sure the shield is connected to the
unbalanced ground of the source and to pins 1 and 3 of
the XLR (or the sleeve and ring of the TRS jack).
• If a CATV cable is connected to the system, try disconnecting it. If the hum goes away, call your cable carrier
to check for proper grounding of the cable.
• Make sure the signal cable is not routed near AC cables,
power transformers, or other EMI sources (including
wall warts and line lumps!). These sources usually
produce hum.
• Is there a light dimmer or other triac-based device on
the same AC circuit as the monitor? Dimmers cause
buzzing noises. Use an AC line filter or plug the monitor
into a different AC circuit.
• Excessive hiss is an indication of an incorrect gain setting somewhere before the speaker.
• If possible, listen to the signal source with headphones
plugged in. If it sounds noisy there, it’s not the monitor.
I hear sound from the monitors after I switch
the AC power off!
• Use the front panel switch to turn the monitors on and
off, or turn off the signal going to the monitors when the
AC power is turned off.
Owner’s Manual
Repair
For warranty service, please refer to the warranty information on page 19.
Non-warranty service for Mackie products is available at a factory-authorized service center. To locate
your nearest service center, visit www.mackie.com, click
“Support” and select “Locate a Service Center.”
If you do not have access to our website, please call
our Tech Support department at 1-800-898-3211 (normal
business hours, Pacific Time), to explain the problem.
They will tell you where the nearest factory-authorized
service center is located in your area.
Service for Mackie products living outside the United
States can be obtained through local dealers or distributors.
Need help with your new HR624 MK2?
• Visit www.mackie.com and click Support to find:
FAQs, manuals, and addendums.
• Email us at: techmail@mackie.com.
• Telephone 1-800-898-3211 to speak with one of our splendid technical support representatives (normal business hours, PST).
Owner’s Manual
15
HR624 MK2
TECHNICAL INFORMATION
HR624 MK2 Specifications
Enclosure
Amplifier Section
Materials and Construction:
3⁄4-inch (19 mm) thick MDF cabinet construction with internal
bracing to add to cabinet stiffness.
Low-frequency power amplifier
Rated Power (at 1 kHz with 1% THD):
100 watts
Rated Load Impedance:
4 ohms
Rated THD (1W to –1 dB of rated power):
0.1 %
Slew Rate:
15V/µS
Distortion (THD, SMPTE IMD, DIM 100):
< 0.035%
Signal-to-Noise
(20Hz-20kHz, unweighted, referenced to 100W into 4Ω):
> 101 dB
Cooling:
Convection
Design:
Monolithic IC, Class AB,
Parametric Servo Feedback
Piano-black gloss finish.
Die-cast aluminum exponential wave guide for controlled, wide
dispersion from high-frequency driver and Zero Edge Baffle™ to
minimize diffraction around the cabinet edges.
Open cell adiabatic “foam fill” acoustical damping material absorbs internal reflections, preventing delayed sound coloration.
Flush-mount connector system allows monitor to be placed
against a wall without need for connector clearance.
Transducers
Low-frequency driver:
Diameter:
6.7 inches (170mm)
Sensitivity (2.83V, 1 m): 89 dB SPL
Nominal Impedance:
4Ω
Voice Coil Diameter:
1.25 inches (32mm)
Power Handling (Long Term/Program):
50/150 watts
Frequency Range:
45 Hz to 6 kHz
Frame:
Die-cast magnesium
Magnet:
Ferrite
Fully shielded:
Ferrite opposing magnet
High-frequency driver:
Sensitivity (2.83V, 1m):
91 dB SPL
Nominal Impedance: 6Ω
Power Handling (Long Term/Program):
20/50 watts
Frequency Range:
1.6 kHz to 22 kHz
Diaphragm/Suspension:
Titanium with polymer suspension
Voice Coil Diameter:
1.0 inch (25.4mm)
Magnet:
Neodymium
Bucking Magnet:
Ferrite opposing magnet
Passive Radiator:
6-inch x 9-inch (152mm x 228mm) mass-loaded elliptical flat
piston with variable thickness filleted edge rubber surround.
Crossover Section
Crossover Type:
Modified Linkwitz-Riley, 24 dB/octave @ 3 kHz
16
HR624 MK2
High-frequency power amplifier
Rated Power(at 1 kHz with 1% THD):
40 watts
Rated Load Impedance:
6 ohms
Rated THD (1W to –1 dB of rated power):
0.1 %
Slew Rate:
15V/µS
Distortion (THD, SMPTE IMD, DIM 100):
< 0.035%
Signal-to-Noise
(20 Hz-20 kHz, unweighted, referenced to 40 W into 8Ω):
> 93 dB
Cooling:
Convection
Design:
Monolithic IC,
Conventional Class AB
System Specifications
Input Type:
Balanced Differential (XLR and 1/4" TRS)
Unbalanced (RCA)
Input Impedance:
20 kΩ Balanced
10 kΩ Unbalanced
Input Protection:
RFI and Level Protected
Maximum Input Level:
+20 dBu
Low Frequency Filter:
80 Hz, 2nd Order, Butterworth
HF Equalization:
Shelving ±2 dB @ 10 kHz
Acoustic Space:
A position: –4 dB @ 50 Hz, shelving
B position: –2 dB @ 50 Hz, shelving
C position: Flat
Compressor:
Independent high and low frequency overload detection
Enclosure Alignment:
6th Order
Over Excursion Prevention: 2nd Order High-Pass Filter
Low Line Voltage Shut Down: 60% of Nominal Line
Thermal Protection:
Amplifier Shut-Down, Auto Reset
Muting:
5 seconds at turn-on
Signal Sense Threshold:
–74 dBu (0.155 mV)
Driver Protection: Independent LF and HF Detection Overall Compression
Owner’s Manual
Graphs
Acoustic Section
HR624 Acoustic Space Filter Response
+10
Free-Field Frequency Response:
±1.5 dB, 49 Hz to 20 kHz
+9
+8
+7
Lower cutoff frequency:
–3 dB @ 45 Hz
Upper cutoff frequency:
–3 dB @ 22 kHz
+6
+5
+4
+3
Sound Pressure Level at 1 meter,
–7.5 dBu into balanced input:
100 dB SPL @ 1m
Maximum peak SPL per pair:
115 dB SPL @ 1m
Maximum short term SPL on axis,
half space 80 Hz to 2.5 kHz:
106 dB SPL @ 1m
+2
+1
dBu -0
-1
-2
-3
-4
-5
-6
Residual noise (maximum gain, 600Ω source,
20 Hz-20 kHz bandwidth):
< 8 dB SPL @ 1m
-7
-8
-9
-10
20
Rated Line Input Voltage and Power:
50
100
200
500
1k
2k
5k
10k
20k
Hz
Power consumption:
Standby mode:
12 watts
Quiescent (idle):
20 watts
Musical Program, Loud mix:105 watts
Both channels driven into
resistive loading to 1% clipping
(LF 86W/4Ω, HF 38W/8Ω): 255 watts
HR624 High Frequency EQ Filter Response
+10
+9
+8
+7
+6
+5
+4
+3
+2
US:
120 VAC, 60 Hz
Europe:
240 VAC, 50 Hz
Korea (AC Power Selector at 240 V):
220 VAC, 60 Hz
Japan (AC Power Selector at 120 V):
100 V, 50-60 Hz
Rated Power
(For UL-6500, CSA-E65-94, EN-60065):
130 watts
+1
dBu -0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
20
50
100
200
500
1k
2k
5k
10k
20k
5k
10k
20k
Hz
Physical Properties
Height:
Width:
Depth Enclosure:
Depth Overall:
Internal Volume:
Weight:
HR624 Low Frequency Filter Response
+10
13.1 in/33.3 cm
8.6 in/21.9 cm
10.3 in/26.2 cm
12.6 in/31.9 cm
0.29 cubic feet (8.2 liters)
23.4 lb/10.6 kg
+8
+6
+4
+2
-0
-2
-4
-6
-8
-10
-12
dBu
LOUD Technologies is always striving to improve our products
by incorporating new and improved materials, components and
manufacturing methods. Therefore, we reserve the right to change
these specifications at any time without notice.
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
-34
-36
-38
-40
20
8.6" (21.9 cm)
50
100
200
500
Hz
1k
2k
12.6" (31.9 cm)
HR624 MK2
WEIGHT
23.4 lb
(10.6 kg)
13.1"
(33.3 cm)
10.3" (26.2 cm)
Owner’s Manual
17
HR624 MK2
HR624 MK2 Block Diagram
+15VDC
POWER
MODE
SWITCH
ON
AUTO
STANDBY
Vref
SIGNAL
SENSE
MUTE
ON/OFF
CONTROL
HIGH = MUTE OFF
LOW = MUTE ON
MUTE
THERMAL
SWITCH
LOW AC
VOLTS SENSE
POWER RING
(POWER = WHITE
OVERLOAD = RED)
POWER SWITCH
(FRONT PANEL)
HF OUT
UNBALANCED
LINE
INPUT
1
BALANCED
LINE
INPUTS
HF TRANSDUCER
THERMAL MODELER
HI-FREQUENCY
POWER AMPLIFIER
HIGH FREQ.
3
CROSSOVER
+2 dB
0
–2 dB
2
SENSITIVITY
COMPRESSOR
SENSITIVE
LF OUT
CALLOUS
ACOUSTIC
SPACE
LOW FREQ
WHOLE
HALF
QUARTER
HF OUT
HI-FREQUENCY
DRIVER
HI-FREQ
TWEET
LO-FREQ
MUTE
LF TRANSDUCER
THERMAL MODELER
LO-FREQUENCY
POWER AMPLIFIER
49Hz (NORMAL)
LF OUT
LO-FREQUENCY
DRIVER
80Hz
WOOF
OUTER SPACE
MOTION DETECTOR
FUSE
BASS CONTROL SERVO LOOP
120V ↔ 240V
+
–
FUSE
MACKIE
HR624 MK2
BLOCK DIAGRAM
(030507)
MUTE
TOROIDAL POWER
TRANSFORMER
SENSE
RESISTOR
HI VDC
+
LO VDC
–
The following are trademarks or registered trademarks of LOUD Technologies Inc.: The Mackie logo, HR
Series, Zero Edge Baffle, and the Running Man.
THX and pm3 are trademarks of THX Ltd. which may
be registered in some jurisdictions. All rights reserved.
Lucasfilm is a trademark of Lucasfilm Ltd.
This manual also contains names and marks of other
companies which belong to those respective companies,
and are hereby acknowledged.
HR624 MK2 design protected under the following patent: DES. 387,351
©2007-2009 LOUD Technologies Inc. All Rights Reserved.
18
HR624 MK2
Please keep your sales receipt in a safe place.
This Limited Product Warranty (“Product Warranty”) is provided by LOUD Technologies Inc. (“LOUD”)
and is applicable to products purchased in the United States or Canada through a LOUD-authorized
reseller or dealer. The Product Warranty will not extend to anyone other than the original purchaser of
the product (hereinafter, “Customer,” “you” or “your”).
For products purchased outside the U.S. or Canada, please visit www.mackie.com/warranty to find
contact information for your local distributor, and information on any warranty coverage provided by the
distributor in your local market.
Owner’s Manual
Mackie Limited Warranty
LOUD warrants to Customer that the product will be free from defects in materials and workmanship
under normal use during the Warranty Period. If the product fails to conform to the warranty then LOUD
or its authorized service representative will at its option, either repair or replace any such nonconforming
product, provided that Customer gives notice of the noncompliance within the Warranty Period to the
Company at: www.mackie.com/support or by calling LOUD technical support at 1.800.898.3211 (tollfree in the U.S. and Canada) during normal business hours Pacific Time, excluding weekends or LOUD
holidays. Please retain the original dated sales receipt as evidence of the date of purchase. You will need it
to obtain any warranty service.
For full terms and conditions, as well as the specific duration of the Warranty for this product, please visit
www.mackie.com/warranty.
The Product Warranty, together with your invoice or receipt, and the terms and conditions located
at www.mackie.com/warranty constitutes the entire agreement, and supersedes any and all prior
agreements between LOUD and Customer related to the subject matter hereof. No amendment,
modification or waiver of any of the provisions of this Product Warranty will be valid unless set forth in a
written instrument signed by the party to be bound thereby.
Owner’s Manual
19
16220 Wood-Red Road NE • Woodinville, WA 98072 • USA
United States and Canada: 800.898.3211
Europe, Asia, Central and South America: 425.487.4333
Middle East and Africa: 31.20.654.4000
Fax: 425.487.4337 • www.mackie.com
E-mail: sales@mackie.com