MK2
FRONT PANEL DESCRIPTION
HR624
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
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.
STANDBY ON
AUTO
ON
POWER
MODE
Overload Protect
12 
•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.
HR624 MK2
•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.