RL 904

2-way-coaxial-loudspeaker in vented box

The RL 904 is an all purpose main loudspeaker for middle size or smaller audio-, video- and film production studios. Its coaxial arranged transducers ensure a sound impression with a high degree of homogeneity to a point source. The power concentration is designed for middle distance monitoring situation, at which a great differentiation in depth and a high fidelity of sound is guaranteed.

RL 904

The RL 904 is an all purpose main loudspeaker for middle size or smaller audio-, video- and film production studios. Its coaxial arranged transducers ensure a sound impression with a high degree of homogeneity to a point source. The power concentration is designed for middle distance monitoring situation, at which a great differentiation in depth and a high fidelity of sound is guaranteed. Non-linear distortion remains small even at high sound pressure levels. The bass reflex system obtains a low-frequency cut-off at 40 Hz and provides a high degree of sound accuracy. We designed the whole system to achieve an optimum group delay.

The two-way MOSFET-amplifier with active crossover is situated at the back of the cabinet and is easily accessible for maintenance. An intermittent LED indicates sound pressure levels within the overload margin of 3 dB and warns of clipping. Beyond this limit the output level gets damped by 20 dB to protect the speaker’s components. To compensate their placement the speaker features two controllers to continuously adjust the low-frequency response.

There are various stands available as optional extras, which fit in the integrated appliance.

General

active two-way monitor for use in small and middle audio-, video production studios, in mobile broadcast vans, and for multi-channel and near-field purposes

Maximum SPL

106 dB / r = 1 m (3.3 ft)

Bandwidth

40 Hz ... 20 kHz ± 3 dB

Calibration:
Acoustic output level / PE = - 14 dBu

> 83 dB / r = 1 m (3.3 ft)

Directivity index
from 100 Hz ... 10 kHz


increasing from 1 to 8 dB

Inherent noise sound level

≤ 7 dB (A) / r = 1 m (3.3 ft)

Total harmonic distortion
measured at 96 dB / r = 1 m (3.3 ft)
from 100 Hz ... 10 kHz



≤ - 40 dB

Nominal Input level

+ 6 dBu adjustable

Input impedance

≥ 10 kOhm RC balanced

Electronic Crossover frequencies

2.5 kHz

Nominal output power MOSFET-amplifier

LF
150 Watt / 4 Ohm
HF
100 Watt / 4 Ohm
Input Connector
XLR 3F

Loudspeaker systems

Woofer
160 mm (6.5") cone
Tweeter
25 mm (1") dome

Operation and Clipping indicator

LED on front side

Power requirements

Europe 230 Volt (± 10 %), AC, 50 Hz
USA & Canada 115 Volt, AC, 60 Hz

Power consumption

max. 160 Watt at full load

Mains Connection

IEC power connector

Dimensions (H x W x D)

398 x 254 x 345 mm (15.7 x 10 x 13.6 in)

Weight

16 kg (35.2 lbs)

Temperature requirements

for use
+ 15°C ... + 35°C (59°F ... 95°F)
for storage
- 25°C ... + 45°C (-13°F ... 113°F)
humidity
45 ... 75 %

Design of the Cabinet

MDF-wood in ash black veneered, optional different veneers or colors
with holding device; optional without holding device

Floor bracket stand

  • Loudspeaker rotable mounted
  • Deliverable heights (Top edge loudspeaker): 1184 mm (46.6 in), 1414 mm (55.7 in), 1544 mm (60.8 in) and 1684 mm (66.3 in)
  • Base panel (W x D): 520 mm x 450 mm (20.5 in x 17.7 in) oder 380 mm x 430 mm (15.0 in x 16.9 in)
  • Base panel and stabilisation panel veneered
  • Racks black powder-coated

Pedestal

  • Integrated cable duct in the pedestal
  • Height (Top edge loudspeaker): approx. 1109 mm (43.7 in)
  • Base panel (W x D): 275 mm x 365 mm (10.8 in x 14.4 in)
  • Pedestal veneered

Wall bracket

  • 35° tilting und 35° rotable
  • Wall bracket black powder-coated

Ceiling bracket

  • Loudspeaker rotable mounted
  • Standard height between adapter plate and bracket: 300 mm
  • other length available
  • Ceiling bracket black powder-coated

Standard veneer ash black (RAL9005), optional veneers and optional colours

We offer our loudspeakers in standard veneer ash black (RAL9005) or for an additional charge in different optional veneers respectively optional colours. This website provides an overview on the optional veneer and lacquer styles. We are pleased to check if your desired individual veneer and colour can be realised.

Important information about deviations from sample pattern

Wood is a natural product. Even the most thorough manufacturing can result in deviations in colour or structure and is no cause for complaint.
Images are represented differently on every screen and hence not colour-proof.