12
HR624 MK2
HR6
24 MK2
FRONT PANEL DESCRIPTION
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.
9. Power Switch
Use this switch to turn on or off the HR624 MK2 from
the front. It works with the POWER MODE [6] switch
on the rear panel in the following way:
• If the POWER MODE switch on the rear panel is set
to STANDBY, the front panel power [9] switch has no
effect. The power [10] ring remains off.
• 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.
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.
INPUT
SENSITIVITY
–10dB
NORMAL
OFF
ACOUSTIC
SPACE
LOW
FREQ FILTER
POWER
MODE
0
(NORMAL)
AUTO
ON
–2dB
+2dB STANDBY
ON
HIGH
FREQ FILTER
HALF
WHOLE (NORMAL)
QUARTER
80Hz
LOW CUT
49Hz
(NORMAL)
B
A
C
