XL SERIE BSTDJ.COM
© Copyright LOTRONIC 2012
Page 15
PROTECTIONS
-
CLIP / Limit
This function is used for preventing dangerous clip signal damage the speakers, CLlP / Limit monitors the distortion produced by
amplifier output, when distortion exceeds 0.5%, CLIP / Limit will reduce the input signal to ensure signal not distortion (CLIP).
Note: lf input signal already has CLIP or exceeds linearity working range of input circuit, then the CLlP / Limit is not valid
- Over-heat
protection
If the amplifier works at full loading for a long time, the fans have reached the hi hest speed. If this status continue and the
temperature rise up to over 105 degree, the amplifier will go into over-heat protection status and the protection indicator (PROT) on
the front panel lights on and therefore, the users are suggested to correctly operate the ampliter, the loading is not lower than 2 ohms
and maintain the airflow good and free. The status of no power output because of over-heat protection usually won’t happen if the
environment temperature not higher than 30 degree.
- VHF
protection
If the amplifier output reaches a certain range and frequency exceeds 10KHz, such as MIC feedback noise, then amplifier may go into
VHF protection after 3 seconds, the protection indicator (PROT) on the front panel will be on and the speakers do not have sound, but
will recover automatically afler protection circuit startup for 10 seconds. If the output signal does not change, ii will keep on VHF
protection.
-
Short circuit protection
All the series amplifier of BST has short circuit protection. This protection make the output transistors work at safe range. When output
is in short circuit, the protection indicator PROT on the front panel will be on and the amplifier has no output. The equipment will be
recovered afler 10 seconds after terms of short circuit removed.
-
AC local power protection
If the AC power voltage is lower than the allowed working voltage (-160V), the power supply will be turned off automatically until the
power voltage is normal.
- DC
protection
If the output signal has large DC voltage (=2.6V ), in order to protect the speaker, the DC protection circuit will be startup the
protection indicator (PROT) on the front panel will be on and the amplifier has no output.
TECHNICAL SPECFICATIONS
XL-300
XL-600
XL-900
XL-1500
XL-2000
8 ohms RMS stereo power
2 x 110W
2 x 200W
2 x 310W
2 x 450W
2 x 600W
4 ohms RMS stereo power
2 x 170W
2 x 300W
2 x 500W
2 x 750W
2 x 1000W
2 ohms RMS stereo power
/
2 x 450W
2 x 600W
2 x 1000W
2 x 1250W
8 ohms RMS bridge power 360W
600W
1000W
1500W
2000W
4 ohms RMS bridge power
/ 800W
1200W
2000W
2600W
Frequency response
20Hz – 20KHz
20Hz – 20KHz
20Hz – 20KHz
20Hz – 20KHz 20Hz
– 20KHz
Damping factor
> 100
> 100
> 200
> 200
> 200
THD
< 0,1%
< 0,1%
< 0,1%
< 0,1%
< 0,1%
S/N ratio
≥
85dB
≥
85dB
≥
90dB
≥
90dB
≥
90dB
Voltage gain
31.6dB
34.2dB
36.1dB
37.8dB
39dB
Output impedance
≥
2 Ohms
≥
2 Ohms
≥
2 Ohms
≥
2 Ohms
≥
2 Ohms
Circuitry
Class AB
Class AB
Class AB
Class 2H
Class 2H
Weight 7Kg
7Kg
9Kg
11Kg
11Kg
Protections : overheat, overload, short circuit, DC, VHF protections, softstart
CE & ROHS norms
BST equipment is covered by a 2 years warranty on parts and labour
The following rules apply from the day the equipment leaves the factory:
The date on the invoice is considered to be the date the warranty begins.
Only companies approved by BST are allowed to work on the equipment. Warranty becomes void when other service technicians open the
equipment.
During warranty period, defective equipment must be sent by pre-paid mail in the original box.
BST will return the goods by pre-paid mail during the first year of warranty; thereafter the mailing cost is to be paid by the recipient
Potentiometers have a limited lifetime and are not covered by the manufacturer for more than normal use.
For all service enquiries, refer to your local distributor, as he is best able to help you.
