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interfering voltage (A) ≤ 1.2 mV = -56 dBu
features of the monitor output: electronically balanced
nominal output voltage 2 V = + 8.2 dBu
nominal load impedance 600 ohms
ambient temperature range +5 °C .. +40 °C
dimensions (W x H x D) 483 x 132 x 345 mm
depth with / without connections max. 400 mm / 340 mm
weight without extensions 16.7 kg
finish anthracite
extension kits for the DPA 4120 and DPA 4140:
NRS 90208 input transformer for floating, balanced input Art. No. 121 641
NRS 90222 remote module Art. No. 121 674
NRS 90224 pilot tone & ground fault surveillance Art. No. 121 676
NRS 90225 standard input module Art. No. 121 677
NRS 90227 output transformer for floating, balanced monitor output Art. No. 121 679
13. Extension kit specifications for the power amplifiers DPA 4120 / DPA 4140
13.1 NRS 90225 standard input module
see specifications DPA 4120 / DPA 4140
13.2 NRS 90222 remote module
see specifications DPA 4120 / DPA 4140
13.3 NRS 90208 input transformer for floating, balanced input
frequency response 20 Hz .. 20 kHz
input impedance ≥ 10 k ohms
idling ratio 1:1
winding resistance; primary 1420 ohms at 20°C
winding resistance; secondary 1420 ohms at 20°C
13.4 NRS 90227 output transformer for floating, balanced monitor output
frequency response 40 Hz .. 20 kHz
nominal load impedance ≥ 600 ohms
idling ration 1:1
winding resistance; primary 18 ohms at 20°C
winding resistance; secondary 18 ohms at 20°C
13.5 NRS 90224 pilot tone & ground fault surveillance
13.5.1 pilot tone surveillance
pilot tone frequency 19 kHz ± 1%
error recognition threshold ≤ 12 mV
fault message output via NRS 90225 collective fault message via READY relay
fault message output via NRS 90222 PROMATRIX manager DPM 4000
13.5.2 ground fault surveillance
input loudspeaker line 4 ohms / 50V / 70V / 100V
fault message output via NRS 90225 collective fault message via READY relay
fault message output via NRS 90222 PROMATRIX Manager DPM 4000
disruptive strength 1000 Veff
error recognition threshold ≤ 50 k ohms