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O 870 - Active Studio Subwoofer
Discontinued, Production from 2008 until 2011
General Description

As consumer technology advances at ever faster rates, professional technology increasingly finds itself trying to keep up. An example of this is the advent of the Blu-ray and other high definition formats that have increased the audio channel count to 7.1. 

The O 870 is an answer to these new demands by offering a new 7.1 High Definition Bass Manager™. This is compatible with all standard consumer formats from mono through to the latest 7.1 HD systems. Eight channels of analog or an optional 8-channel, 24-bit, 192 kHz digital input card ensures flexible interconnectivity for modern studios. Four-mode LFE-channel processing guarantees compatibility across all formats and industries. Forth-order crossovers and flexible acoustical controls allow for seamless system integration. Built-in volume control and a hardware remote control allows for centralized system control independent of the source, and the electronics can be remote located to reduce cabling

The latest amplifier technology and acoustical components have been used to ensure the most accurate sound reproduction possible. Robust drivers, a rock-solid cabinet, and carefully designed ports guarantee a tight, articulate, and distortion-free low frequency reproduction, even at high replay levels. Using the sum output, Plane Wave Bass Array™ (PWBA™) techniques acoustically improves lateral consistency in the listening area. The bass extends down to 18 Hz.

The O 870 subwoofer is designed to complement our extensive range of monitors, and can be used on its own, or daisy-chained to make larger systems capable of higher SPL. The O 870 can be used in music, broadcast, and post production studios for tracking, mixing, and mastering. The cabinet can be positioned next to a wall or flush mounted into a wall due to the front mounted port, and can be mixed freely in multichannel systems with other loudspeakers from our range – Product Selection Guide

Block Diagram (Download)


Flexible electronics
 7.1 Channel High Definition Bass Management™ compatible with all formats from mono to 7.1
 Bypassable 4th order 80 Hz active crossover for maximum compatibility with consumer reproduction
 0 and +10 dB LFE gain and 4-mode LFE processing:
 LFE to subwoofer and left/right
 LFE to subwoofer only up to 80 Hz
 LFE to subwoofer only up to 120 Hz
 LFE to subwoofer with no filtering – for daisy chaining subwoofers and external signal processing systems
 Independent control of bass management for front and back channels
 System wide volume control via optional hardware remote controls or RS-232
  Acoustical controls adapt the subwoofer’s response to the environment
 Output level
 Low cut
 Parametric equalizer
 45° step phase control with a built-in test signal
 Larger systems and Plane Wave Bass Arrays™ maybe constructed using the Sum output
 Remoteable electronics (REK 2 and an SC nn) for installation convenience, less cabling, and convenience of use
 Integrated electronic limiter for amplifier and driver protection
 Low heat dissipation amplifiers
 Electronics can be remotely powered on with two modes of operation (0 V and 12 V trigger)

Robust drivers and cabinet
 Low frequency extension for main loudspeakers down to 18 Hz
 Low distortion magnetically shielded long-throw drivers
 Reduced bass compression at high SPL from generously proportioned bass reflex ports

Large system with 6 dB higher output than O 810


A main loudspeaker can be mounted onto an O 870 to make a large 4-way column system

 Allows main loudspeakers to play louder and with lower distortion
 Wooden cabinet with a tough painted finish (anthracite or silver) and high density rubber isolating feet
 Excellent self-damping properties leading to minimal cabinet resonances
 Cabinet look conforms to the family design

Extensive accessories range
 Remote controls (SRC 1, SRC 2) and remote cables (RC 2, RC 5, RC 10, RC 15, RC 20, RC 25, RC 30) 
 Remote electronics Kit (REK 2) and driver cables (SC 2, SC 5, SC 10, SC 15, SC 20, SC 25, SC 30)
 Flight case (FO 870)

Delivery Includes
 1x O 870
 3x Power cables (Euro, UK, USA)
 1x Operating manual
 1x Angles chart
 1x Production calibration certificate
 1x Product guarantee
 1x Trimmer and switch screwdriver
 O 870 Front View, 
White Background


· General Description
· Technical Data
· Accessories
· Variants
· Measurements
· Download
· Software
· Tender Description
· Further Images
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