CRS8 - Medium-format reference surround

  • RBN401 pro-ribbon HF driver with 8” woofer
  • Signal Integrity Sensing™ pre-wired cable compensation
  • ‘Real-90’ dispersion, H 90° x V 40° (nom.)
  • 10° slanted baffle for optimised projection
  • Available in 8 ohms or 4 ohms version for multi-channel surround

Product description

The CRS8 is a 2-way passive-filtered full range loudspeaker, designed to meet all requirements of current and future (Digital) Cinema surround sound formats.
Featuring the patented Alcons pro-ribbon driver technology, the CRS8 combines an exceptional clarity and intelligibility with an unusually high dynamic range, offering the most realistic sound reproduction possible.

The CRS8 system consists of one RBN401 pro-ribbon driver for HF and a vented 8” mid-bass for LF reproduction. The CRS8 HF section has an 800W peak power input, enabling a 1:16 dynamic range with up to 90% less distortion from 1kHz. to beyond 20kHz. The absence of a “compression threshold”, caters for the same tonal balance at all SPL’s, while the patented “Real-90” horizontal dispersion of the RBN401 guarantees a very stable sound field throughout the operating bandwidth.

By utilizing identical MHF components as featured in Alcons’ Digital Cinema screen systems, a perfect voicing matching between screen- and surround system is realized, resulting in an exceptionally wide and uniform sound stage throughout the entire listening area.

The 10-degree slanted baffle together with the upside-down speaker arrangement and the pro-ribbon’s response characteristic in the vertical plane, caters for a very smooth LF/HF blending, for both near and far located seats (on-axis as well as off-axis). The enclosure design provides for low profile wall mounting.

For full system performance, the CRS8 needs to be driven by an ALC controller-amplifier, delivering maximum sound quality with increased headroom and utmost operation reliability.

The Signal Integrity Sensing™ pre-wiring ensures complete cable/connector compensation between the CRS8 and ALC, significantly increasing response accuracy, regardless of cable length and system impedance, with tight and accurate mid and bass response as result.

Typical applications include surround sound system for premium Digital Cinemas, high-end mix/screening rooms, as well as post-production facilities, dubbing stages and quality-conscious performing-arts theatres.

Dimensional drawing

Technical specifications

Frequency Response  
+/- 3 dB   74Hz. – 20.000Hz
+/- 10 dB   58Hz -
Sensitivity (SPL 1W/M)   94 dB
Sensitivity Nominal   97 dB (200Hz. – 10kHz.)
Nominal Impedance   8 or 4 ohms
Recommended drive   Sentinel3 min., max. 3 pcs (8 ohms)
1 pce (4 ohms) per channel (2.7 ohms / 4 ohms)
Nominal SPL peak   123dB (Sentinel3 8 ohms 200Hz - 10kHz)
129dB (Sentinel10 8 ohms 200Hz - 10kHz)

128dB (Sentinel3 4 ohms 200Hz - 10kHz)
133dB (Sentinel10 4 ohms 200Hz - 10kHz)

Dispersion H x V   90° x 40° (nom.)

Physical specifications

System 2-way, full-range
Filtering   passive
Drivers LF   1x AMB8 8”, vented
Drivers HF   1x RBN401 4” pro-ribbon driver
Connectors   2x Speakon NL4 input/link
Physical dimensions   mm        inches
Height   449        17.7
Width   282        11.1
Depth   237          9.3
Weight (approx.)   11,6kg      (25.6lb)
Warranty   6 years limited

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