Rear Panel Description; Signal Inputs; Input Sensitivity; Acoustic Space - Mackie HR824 MK2 Owner's Manual

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.
For THX applications, the rear panel
switches and controls should be set
to the THX positions as indicated in
this section.

1. SIGNAL INPUTS

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):
Hot (+)
Cold (–)
Shield (Ground)
• The HR824 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.)
8
HR824 MK2
XLR TRS RCA
Pin 2 Tip Tip
Pin 3 Ring —
Pin 1 Shield Shield

2. INPUT SENSITIVITY

–
OFF
INPUT
SENSITIVITY
THX = NORMAL
The HR824 MK2 expects a line-level signal at its input
connectors.
• 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 HR824 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
INPUT
ACOUSTIC SPACE
SENSITIVITY
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 HR824 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 HR824 MK2s free-standing, away from
walls and corners (whole space [3C]), set the
ACOUSTIC SPACE switch to the "C" position
(NORMAL).
10dB
NORMAL
QUARTER HALF WHOLE
( NORMAL )
ACOUSTIC SPACE
80Hz 47Hz
( NORMAL )
LOW CUT
HALF WHOLE
( NORMAL )
LOW FREQ
80Hz 47Hz
( N
LOW CUT
LOW FREQ
–
37Hz 0
2dB
( NORMAL )
HIGH FRE