RL 921K

3-way-coaxial-loudspeaker with cardioid characteristic in bass range

The RL921K is based on the timeless classic design of the legendary RL901K. Not only optically but also tonally the RL921K follows in the steps of its older sibling. Therefore it is the optimal solution in cases where the RL901K can not be used because of its size or short listening distances. The RL921K is aimed at professional users as well as music enthusiasts.

RL 921K

The RL921K is based on the timeless classic design of the legendary RL901K. Not only optically but also tonally the RL921K follows in the steps of its older sibling. Therefore it is the optimal solution in cases where the RL901K can not be used because of its size or short listening distances. The RL921K is aimed at professional users as well as music enthusiasts.

By the cardioid radiation characteristics within the frequency range from 30 through 250 Hz the reflections on the back walls of listening rooms can be minimized. In addition the transfer characteristic can be matched to the acoustical conditions of the reproduction room as well as to the set-up situation by an integrated room matching filter.

The total directivity index of the monitor was optimized for very short listening distances and base distance between two and three metres (6.6 ft and 9.9 ft). As the bass system a very linear 300-mm (12’’) long-throw driver in a cardioid cabinet is employed, delivering excellent impulse fidelity. The 100-mm (4’’) cone is mounted together with the 25-mm (1’’) dome tweeter coaxially in front of the bass system allowing a precise steering of the directivity index. As a result a realistic and steady spatial performance of the sound image around the listening position is achieved, with high homogeneity and smallest possible coloration. By the great membrane area the RL921K is in the highest degree level proof while at the same time it has the lowest distortions. Therefore the RL921K is a precision studio tool allowing fatigue free working for hours.

The three-channel MOSFET power amplifier with electronic crossover is integrated within the back wall of the cabinet and is hinged for service purposes. An intermittent LED lighting signals when the overload limit is reached. After crossing of the maximum level the output level will be reduced by 20 dB to avoid any overloading of the components.

The RL921K1 is a shortened cabinet variant of the RL921K, that is employed when not enough installation depth is available. Be it a video wall or an outside broadcasting van. For maximum flexibility when choosing the mounting position the speaker is also available in a lying variant. As an alternative to the standardly provided MOSFET amplifier in an upright standing enclosure both the 19’’ compatible Class D amplifiers RL-Amplifier and RL-Amplifier 2 are also available.

A variety of special stands and racks is available as accessories. According fixing elements have been integrated into the loudspeaker cabinet.

General

Active 3-way coaxial loudspeaker for listening distances between 2 and 3 m (6.6 ft and 9.9 ft)

Maximum SPL
from 100 Hz ... 6 kHz


115 ... 121 dB / r = 1 m (3.3 ft)

Bandwidth

30 Hz ... 20 kHz ± 3 dB

Calibration:
Acoustic output level / PE = - 14 dBu

89 dB / r = 1 m (3.3 ft)

Directivity Index
from 100 Hz ... 10 kHz


Increasing from 4 to 10 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



≤ - 46 dB

Nominal input level

+ 6 dBu adjustable

Input impedance

≥ 10 kOhm RC balanced

Electronic crossover frequencies

650 Hz and 3.0 kHz

Nominal output power amplifier

LF
180 W / 4 Ohm
MF
100 W / 4 Ohm
HF
100 W / 4 Ohm

Input connector

XLR 3F

Loudspeaker systems

Woofer
300 mm (12") cone
Mid-range unit
100 mm (4") cone
Tweeter
25 mm (1") dome

Operation and clipping indicator

LED on front side

Power requirements

230 V ~ ± 10 %; 50 ... 60 Hz
115 V ~ ± 10 %; 50 ... 60 Hz (optional)
100 V ~ ± 10 %; 50 ... 60 Hz (optional)

Power consumption

Max. 300 VA at full load

Mains connection

IEC power connector

Temperature requirements

for use
+ 15°C ... + 35°C
for storage
- 25°C ... + 45°C
humidity
45 ... 75 %

RL921K (Amplifier in loudspeaker cabinet)

Dimensions (h x w x d)

550 x 380 x 370 (21.7 x 15 x 14.6 inch)

Weight

39.5 kg (87.1 lbs)

Design of the cabinet

MDF wood in ash black veneered; optional other veneers or colours
with holding device; optional without holding device
with handles; optional without handles

RL921K1 (Amplifier in separate enclosure)

Connection cable
Loudspeaker - Amplifier enclosure

Speakon NL8
Standard length 3 m (9.9 ft); optional other lengths

Dimensions (h x w x d)

Loudspeaker
550 x 380 x 300 (21.7 x 15 x 11.8 inch)
Standard amplifier enclosure
475 x 279 x 120 (18.7 x 11 x 4.7 inch) without base plate
Highend amplifier enclosure
495 x 320 x 260 (19.5 x 12.6 x 10.2 inch) with base plate

Weight

Loudspeaker
26.5 kg (58.4 lbs)
Standard amplifier enclosure
11 kg (24 lbs)
Highend amplifier enclosure
12 kg (26 lbs)

Design of the cabinet

Loudspeaker
MDF wood in ash black veneered; optional other veneers or colours
with holding device; optional without holding device
Standard amplifier enclosure
MDF wood with scratch proof structure coating black RAL9005; optional other colours
Highend amplifier enclosure
MDF wood in ash black veneered; optional other veneers or colours

Floor bracket stand for RL921K

  • Loudspeaker rotable mounted
  • Deliverable heights (Top edge loudspeaker): 1795 mm (70.7 in), 1585 mm (62.4 in), 1445 mm (56.9 in) and 1330 mm (52.4 in)
  • Base panel (W x D): 540 mm x 520 mm (21.3 in x 20.5 in)
  • Base panel and stabilisation panel veneered
  • Racks black powder-coated

Pedestal for RL921K

  • height (top edge RL921K): ca. 1150 mm (45.3")
  • base plate (B x T): 390 mm x 380 mm (15.4" x 15")
  • fillable pillars and top plate in polished stainless steel
  • base plate in microstructure semi-gloss-black

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.