Protections - Master audio HD Serie Manual De Usuario

13. Limiter adjustment
The 2014 version HD amplifiers feature limiter adjustment,
in which the user, with an easy adjust, can limit the output power
of each output independently. It is an easy access adjustment
and it is located behind the front panel.
The front panel is fixed with two M4 screws with knurled
head that can be loosen with the fingertips. After removing the
front panel you will find two LIMITER sections, one per channel,
they can be adjust with a small flat-tip screwdriver.
The factory setting for this parameter is set to fully clock-
wise, this way the device delivers its maximum power with mini-
mum distortion thanks to its anti-clipping system.
Once the limiter settings have been adjusted, please attach
again the front panel with the two M4 screws with knurled head.
OUTPUT POWER TO LIMITER SETTING
LOW LOAD
(BRIDGE 4 Ohms or STEREO/PARALELL 2 Ohms)
CAUTION: when you want to use the amplifier in bridge
mode @ 4 Ohms or Stereo/parallel mode @ 2 Ohms at full power
it is recommended to set the limiter in position 2 as shown in the
attached table to avoid overheating.
BRIDGE MODE 4 Ohms
2
BRIDGE MODE
4 Ohms
STEREO/PARALLEL MODE
2 Ohms
STEREO/
2
PARALLEL
MODE
2 Ohms

14. Protections

Temperature
An inadequate installation or any other anomaly related to cool-
ing may cause that the amplifier's temperature exceeds their
safe limit (>90ºC), exposing its internal components to failure. If
such a situation may arise, the corresponding protection circuit
will cause a stop during a certain time according to the serious-
ness of the anomaly detected. The PROTECTION and LIMITER
leds will light on at the same time, and the output of the affected
channel(s) will be disconnected.
In models HD2000 and HD3200, before the amplifier completely
stops because of temperature problems, it will reduce the out-
put level by 6dB approximately. Once the temperature reduce to
normal parameters, the normal output level will be reestablished.
:
HD 1200
HD 800 HD 2000
1180W 1640W 2200W
HD 800 HD 1200 HD 2000
590W 820W 1100W
STEREO PARALLEL:
In STEREO/PARALLEL mode each channel have an inde-
pendent limiter adjustment; see the attached table of the deliv-
ered output deppending of the limitrer adjustment:
STEREO/PARALLEL MODE
0
2
3
6
BRIDGE:
In BRIDGE mode the limiter adjusment is the one for
channel A, the same with the volume adjust, see attached table
of the delivered output power depending on the limiter adjust-
ment:
BRIDGE MODE 8 Ohms
0
2
3
6
Note (1): The limiter adjustments and power that the amplifiers can
deliver with this adjustment are relative, because the HD amplifiers
HD 3200
feature a dynamic limiting system able to offers the best results.
4400W
The conditions to get the data from the tables has been created using
HD 3200
100Hz sineburst input signals with 100ms at 0dB and 400ms at
-20dB. This condition is considered as a standard / heavy duty in the
Audio Industry.
2200W
Short circuit
In case of very low impedance or short circuit in any loud-
speaker output, the LIMITER led is activated and a significant
descent of the output level of the affected channel will be ob-
served (loss of volume, but keeps working).
Direct Current
In the case that due to some malfunction the power module
tries to deliver direct current (DC) at the output, the protection
circuit will immediately disconnect the module to avoid dam-
age to the loudspeakers. In that case, the PROTECTION and
LIMITER led's will light on at the same time and the output will
be disconnected.
HD 1200
HD 800
210W
16 Ohms 115W
8 Ohms 230W 420W
4 Ohms 450W 800W
16 Ohms 110W
76W
8 Ohms 220W
152W
4 Ohms 295W 410W
16 Ohms 50W 70W
8 Ohms 100W 140W
4 Ohms 195W 280W
16 Ohms 38W
25W
8 Ohms 50W 76W
4 Ohms 95W 135W
HD 1200
HD 800
8 Ohms 900W 1600W
8 Ohms 590W 820W
8 Ohms 390W 540W
8 Ohms 190W 270W
HD 2000 HD 3200
350W 650W
700W 1300W
1300W 2400W
150W
320W
300W 600W
550W 1100W
90W
180W
180W
320W
350W
625W
50W 100W
100W 200W
200W 400W
HD 2000 HD 3200
2800W 4800W
2200W
1100W
700W 1250W
400W
800W