KH 870 II

Powerful Reference-Quality Sub for Immersive Systems 

The KH 870 II is the perfect subwoofer for larger rooms, providing powerful bass extension with Neumann precision. It includes a unique and flexible Bass Manager for stereo, surround and immersive systems up to 7.1.4. Analog and digital outputs provide flexible connectivity to up to 11 studio monitors. 

Next Generation Subwoofer 

The KH 870 II improves on its predecessor in acoustic performance and adds new features. Thanks to two novel long-throw 10” woofers with Extremely Linear Force Factor (ELFF™) technology and intelligent protection limiters, the KH 870 II ensures exceptionally low distortion even at maximum SPLs. 
 
The KH 870 II extends low frequency reproduction down to 16 Hz and delivers about twice the output of the KH 810 II. This makes the KH 870 II the perfect complement to midfield speakers such as the KH 420. 
 
The KH 870 II is DSP-controlled for superior sonic performance and seamless integration via MA 1 Automatic Monitor Alignment (sold separately). When combined with analog Neumann studio monitors such as the KH 120 A (discontinued), KH 310, or KH 420, it offers sufficient DSP-power for aligning an entire stereo, surround or even immersive system up to 7.1.4 via MA 1, optimizing not only the frequency response but also the phase. Of course, the KH 870 II is also a perfect complement to Neumann’s DSP-equipped studio monitors. In surround and immersive systems, analog and DSP-equipped Neumann speakers can be combined and room-aligned using MA 1 with Multichannel Extension (sold separately). The KH 870 II is therefore much more than “just” a subwoofer: It is the perfect tool for upgrading existing systems and/or extending them for immersive audio. 

Precision in Every Detail 

As subwoofers are typically placed on the floor, robust grilles protect the drivers from accidental damage. The rigid cabinet features a highly efficient bass reflex system, which is carefully engineered and tuned for the tightest bass reproduction – with inaudible port noise. 
 
Two analog XLR inputs and outputs are available to connect the subwoofer for stereo operation. For multichannel operation, the KH 870 II offers two Sub D25 connectors for up to 12 analog input channels and another two Sub D25 connectors for up to 11 analog output channels. All inputs and outputs are electronically balanced. Studio monitors can also be connected digitally via AES3 (BNC). For audio networking, this subwoofer is also available as an AES67 variant, the KH 870 II AES67. 
 
The KH 870 II excels in music, film scoring, broadcast, and post-production studios for tracking, mixing, and mastering. Thanks to a novel power amp design, the KH 870 II combines superior audio performance with excellent energy efficiency. Its Auto Standby function can be deactivated in the MA 1 app. 

Benefits 

• Bass extension of the monitoring system down to 16 Hz 
• Increasing the maximum SPL of the entire system 
• Decreasing harmonic and intermodulation distortion of loudspeakers 
• MA 1 Ready for perfect alignment of the entire system and seamless subwoofer integration. For multichannel setups, we offer MA 1 Multichannel Extension option. 
• MA 1 integration of analog KH Line speakers, enough DSP power for an entire multichannel system up to 7.1.4. 

• Tough painted finish and build-in rubber feet for acoustic isolation 
• Excellent self-damping properties leading to minimal cabinet resonances 
• No standing wave resonances inside cabinet 
• Ultra tight bass reproduction due to very low group delay 
   

• Damping of break up modes brings low distortion at high sound levels 
• Extremely linear force factor provides low harmonic distortion even at high excursions 
• Reduced air noise and improved rocking modes 
• Grille protects against mechanical damage 
   

• Standard interfacing to professional equipment 
• Daisy chain input and output for subwoofer arrays 
   

• 192 kHz, 24-bit conversion 
• 7x BNC: Channels 1-3, Channels 5-12, Daisy Chain Out 
   

• Loudspeaker system including analog KH-line monitors can be controlled via MA 1 - Automatic Monitor Alignment Software. 
   

• Toggle switch for selection of two completely independent modes of operation and calibration: on the device or via the network using the MA 1 - Automatic Monitor Alignment software. 
   

• One version works in any country and is robust to poor quality mains supply. 
   

• Inputs with very high CMRR to reduce noise induced by long cables in electrically noisy environments 
• Completely symmetrical internal signal flow to avoid electrical interferences 
   

• Improved transient response 
• Assured reliability and safety 
• Separate thermo limiter to protect the voice coil and power amplifier 
   

• Reduces power consumption when product is not in use.