PLX Series SPECIFICATION
H class - how does it work?

It can be said that H class amplifiers produce higher voltages, which results in stronger power output. To enable this higher power, the voltage of the powering stage is increased (usually about twice as much). This is done by means of a system of primary and secondary battery capacitors. Power switching has a shorter duration than the period of the highest audible frequency (20khz). Only the fastest transistors and specialist systems are able to cope with this rapid change of powering voltage without affecting the outgoing signal. Thanks to this, our output stage has found its usage in ultrasound heat sealing. It is worth noting that the powering voltage is increasing with the cadence of the signal only in that channel and only when necessary. As well as increasing power, such a construction gives better efficiency and reliability. Compared to conventional G class amplifiers, there is only one level of power working rather than two. This eliminates the problems associated with the prediction of dividing the power into levels which can theoretically be 0% on one level and 100% on the other. Thanks to this, H class amplifiers, with one power level, are more reliable than ones with multiple power levels. Above all, H class amplifiers work more effectively in the output stage. Their higher efficiency when compared to A and B class amplifiers means that less heat is radiated in the output stage so less energy is drawn from the power source.

PLX amplifiers have a reversed cycle for the receiving load from the feeder capacitors in one channel compared to another. This is done so that it works in stereo mode, as well as in bridged mode, in a way that gives the impression of being in bridged mode all the time. This gives twice the efficiency of the feeder capacitors (compared to conventional configurations) for signals lower than 100Hz.

Measurements of compatibility with CE standards (electromagnetic compatibility) have proven that the PLX series have a very high resistance to radio interference - radiated and conducted, as well as to high voltage interference.

These amplifiers have intelligent overload protection which also protects against short-circuit. They can operate on a 2ohm overload and remain cool without any problems. The protective system also regulates the heat sink and transformer temperature. Cooling is provided by two 120mm fans with constantly varying speeds. This results in the amplifier always working at its optimal temperature.

FEATURES
  • High power input (up to 4000W),
  • High quality components,
  • H class,
  • Automatic clip limiter,
  • Low frequency filter (subsonic filter) 25Hz 850Hz,
  • Crossover frequency 75Hz-1200Hz,
  • Smooth independent regulation for each channel,
  • Independent protection systems for each channel,
  • Variable speed forced cooling system,
  • Automatic silent connection and disconnection of the load,
  • Constant work with 2ohm load,
  • Double output sockets XLR and jack types,
  • Toroidal transformer, minimising hum,
  • Bipolar transistors,
  • Anti-dust filters,
  • 36 month warranty.
PLX Series
Technical Data
Model PLX 2400 PLX 3200 PLX 4000
Response frequency 20Hz(-2,5dB) - 20kHz(-1dB) 20Hz(-1,4dB) - 20kHz(-0,5dB)
10dB below indicated power,
-3dB decrease
13Hz - 50kHz 9Hz - 57kHz
Output power RMS
1kHz @ 1%THD One channel driven
1x4Ω
1x2Ω
900W
1500W
1100W
1850W
1350W
2300W
1kHz @ 1%THD Two channels driven
2x8Ω
2x4Ω
2x2Ω
430W
800W
1200W
550W
1000W
1600W
680W
1250W
2000W
20Hz - 20kHz @ 1%THD Both channels driven
2x4Ω
2x2Ω
760W
1100W
940W
1425W
1150W
1850W
1kHz @ 1%THD Bridge
1x8Ω
1x4Ω
1600W
2400W
2000W
3200W
2500W
4000W
Music power, 5ms
2x4Ω
2x2Ω
1000W
1900W
1250W
2400W
1600W
3100W
Distortion (THD) 1kHz,
2Ω
80% rated power
< 0,02%
Distortion 20Hz - 20kHz
2Ω
80% rated power
< 0,05%
Damping factor 10-400Hz 8Ω > 400 > 600
Dynamics (S/N) A - weighted > 100dB
Voltage gain 63 (36dB) 72,6 (37dB) 80,8 (38dB)
Output stage Klasa H
Input sensitivity (V RMS) rated power
4Ω
2Ω
0,87V (+1dB)
0,775V (0dB)
Input impedance
unbalanced
balanced
10kΩ
20kΩ
Subsonic filter 25Hz, 50Hz 24dB/okt
Two way crossover 12db/oct. LO, OFF, HI 75Hz - 1200Hz bordering frequency -2dB
LED Indicators Ready, Protect, Signal, Clip
Regulations, switches
front
back
Ch A & Ch B volume
Subsonic filter, Mode switch, Crossover switch, Crossover Ch A & Ch B
Cooling Cooling fan with continous variable speed. Front to rear.
Protection automatic, silent connecting and disconnecting load, DC at output, short-circuit, thermal, ultrasonic, subsonic, limiter, softstart
Power supply 230V AC, 50Hz +10/-15%
Idle current draw 0,3A
Supply current at 1/8 rated power, pink noise
2x2Ω (typical music program material)
4,5A 6A 7,5A
Supply current at 1/3 rated power, pink noise
2x2Ω (hard music program material)
9,5A 12A 15A
Filter storage 94000µF 114000µF 120000µF
Max output voltage 88V 104V 120V
Max power dissipation 5000W 6120W 9680W
Socket
input / output XLR & Jack / Neutrik speakon
Slew rate (with input filter and protection circuit) 40V/µs
Dimensions (WxHxD) 483x132x420 mm
Weight 25kg 27kg 31kg
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