Modular Power Amplifier
  • The AP-4U and the AM4-U 4 cannel modular system amplifiers are the most flexible solutions for any mobile and permanent installation application
  • The module slots on the front panel of AP-4U or AM-4U allow insertion of analogue or digital controller cards.
  • Therefore it is feasible to integrate the signal processing. Normally this is realized through external equipment. The advantage of handling things in this way is quite obvious.
  • Using the control modules provides the opportunity to set up very compact sound reinforcement systems, individually matching a particular application.
  • Cable length and connections are reduced to the minimal amount.
  • For example AP4-U can be attached to up to eight T18W, which forms a bass fundament for the TLA-101 Line Array or the Onax PA-Systems.
  • The mechanic construction and manufacturing guarantees highest sound precision. The robust and highly rigid steel chassis is meant to survive the extensive wear of touring applications.


Power 4 channel mode 4×1200W/peak 4×3000W
Power 4 channel mode 4×1800W/peak 4×5000W
THD <0,1% 20Hz-20KHz
Intermodulation distortion <0,5% (f = 60Hz/7Khz, 4:1 )
on normal working condition
Frequency response
20Hz - 20KHz (±0,25dB )
Phase deviation <15°
Damping factor > 600 20Hz-400Hz
Crosstalk -75dB
Signal to noise ratio >105dB
Total gain 40±0.5dB
Error of channel gain <0,25dB
Input sensitivity 1V
Slew rate >100Vμs
Input impedance Unbalanced:10KΩ; Balanced:20KΩ
Input connectors 8pcs,3-pin XLR Neutrik
Output connectors 4pcs,Speakon NL4 MP
Cooling two fans, brushless,stageless shifting
Controls on front panel Power on/off ; 4 x mute;
Controls on back panel Fuse
Indicator on front panel 4 x mute light
Amplifier protection DC , overload & overheat protection etc.
Dimensions (W×D×H) 483×452×178mm
Power supply
AC 220V 230V, 50Hz 60Hz, 1500VA
Weight 40kg

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 AP-4U Image