QSC RMX Series Technical & Service Manual

2 QSC Audio Products, LLC
RMX 850 RMX 1450 RMX 1850HD RMX 2450
OUTPUT POWER in watts
FTC: 20 Hz–20 kHz @ 0.1% THD, both channels driven
8Ω per channel 185 260 350 450
4Ω per channel 280 400 550 650
EIA: 1 kHz @ 0.1% THD, both channels driven
8Ω per channel 200 280 360 500
4Ω per channel 300 450 600 750
1 kHz @ 1% THD, typical, both channels driven
2Ω per channel 430 700 900 1200
Bridge Mono:
8Ω, 20 Hz–20 kHz, 0.1% THD 530 800 1300
8Ω, 1 kHz, 0.1% THD 600 900 1200 1500
4Ω, 1 kHz, 1% THD, typical 830 1400 1800 2400
DYNAMIC HEADROOM 2 dB @ 4Ω
DISTORTION
SMPTE-IM < 0.01% < 0.01% < 0.02% < 0.02%
FREQUENCY RESPONSE 20 Hz–20 kHz, +0/-1 dB
(at 10 dB below rated output power) -3 dB points: 5 Hz and 50 kHz
DAMPING FACTOR > 300 @ 8Ω
NOISE (unweighted 20 Hz to 20 kHz, below rated output) 100 dB 100 dB 100 dB 100 dB
VOLTAGE GAIN 31.6× (30 dB) 40× (32 dB) 46× (33 dB) 50× (34 dB)
INPUT SENSITIVITY, V RMS
full rated power @ 8Ω 1.15v (+3.4 dBu) 1.15v (+3.4 dBu) 1.16v (+3.5 dBu) 1.23v (+4.0 dBu)
INPUT IMPEDANCE 10 kΩ unbalanced
20 kΩ balanced
CONTROLS Front: AC switch, Ch. 1 and Ch. 2 gain
Rear: 10-position DIP switch
INDICATORS POWER: Green LED CLIP: Red LED, 1 per channel
SIGNAL: Yellow LED, 1 per channel
CONNECTORS Input: Active balanced; XLR and ¼" (6.3 mm) TRS, tip and pin 2 positive, and barrier strip
Output: “Touch-Proof” binding posts and Neutrik Speakon™
COOLING Continuously variable speed fan, back-to-front air flow
AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic, and RF protection
Stable into reactive or mismatched loads
LOAD PROTECTION Turn-on/turn-off muting (all models)
AC coupling AC coupling Triac crowbar (each channel) Triac crowbar (each channel)
OUTPUT CIRCUIT TYPE AB AB H H
AB: Class AB+B complementary linear output
H: Class AB+B complementary linear output with Class H 2-step high efficiency circuit
DIMENSIONS 19.0" (48.3 cm) wide, 3.5" (8.9 cm) tall (2 rack spaces)
15.9" (40 cm) deep (rack mounting to rear support ears)
WEIGHT Shipping: 41 lb. (18.6 kg) 46 lb. (20.9 kg) 50.5 lb. (23 kg) 50.5 lb. (23 kg)
Net: 35 lb. (15.9 kg) 40 lb. (18.2 kg) 44.5 lb. (20.2 kg) 44.5 lb. (20.2 kg)
POWER REQUIREMENTS Available for 120 or 220–240 VAC, 50/60 Hz
POWER CONSUMPTION @ 120 VAC
(both channels driven)
Multiply currents by 0.5 for 230V units
lacipyT
1
lluF
2
xaM
3
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A5.0
8 ΩΩ
Ω
ΩΩ
A3A1.4A4.7
4 ΩΩ
Ω
ΩΩ
A5.4A6.6A5.11
2 ΩΩ
Ω
ΩΩ
A5.6*A5.9*A71
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1
lluF
2
xaM
3
eldI
A5.0
8 ΩΩ
Ω
ΩΩ
A7.3A4.5A01
4 ΩΩ
Ω
ΩΩ
A6A6.9A61
2 ΩΩ
Ω
ΩΩ
A3.9*A7.41*A52
lacipyT
1
lluF
2
xaM
3
eldI
A6.0
8 ΩΩ
Ω
ΩΩ
A4A7.9A4.61
4 ΩΩ
Ω
ΩΩ
A3.6A6.51A72
2 ΩΩ
Ω
ΩΩ
A2.9*A32*A14
RMX Series Performance Specifications
Typical
1
Full
2
Max
3
Idle
0.8 A
8 ΩΩ
Ω
ΩΩ
3.9 A 6.9 A 12.6 A
4 ΩΩ
Ω
ΩΩ
6.1 A 11.2 A 20.7 A
2 ΩΩ
Ω
ΩΩ
8.7 A 16.6 A* 32 A*
1. Typical—Measured with pink noise signal on all channels at 1/8 of full average power. Producing peaks that occasionally reach the amp’s clipping point, this level approximates the maximum operating
level before clipping affects sound quality. These data would be the amp’s typical worst-case current.
2. Full—Measured with pink noise signal on all channels at 1/3 of full average power. Music at this level would typically produce massive clipping. In a class B amplifier, this would be the approximate
point of maximum heat production.
3. Max—Measured with continuous sine wave signal on all channels at a point of slight clipping (1% THD). This represents a “test bench” scenario and does not resemble any real-world usage.
US patents pending SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

QSC RMX Series Specifications

General

Series	RMX
Channels	2
Frequency Response	20Hz - 20kHz (+0/-1dB)
Signal to Noise Ratio	100 dB
Input Impedance	20k ohms (balanced), 10k ohms (unbalanced)
Cooling	Variable speed fan
Protection	Thermal, short circuit, DC, ultrasonic, RF
Connectors	Input: XLR and 1/4" TRS, Output: Binding posts and Speakon