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Description
Neumann KH 870 II AES67 DSP-Controlled Powered Subwoofer - 2x10"The KH 870 II AES67 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 AES3 outputs (BNC) for up to 11 studio monitors as well as redundant AES67 network connectivity allow for flexible connectivity. Deep and extremely powerful bass down to 16 Hz The perfect complement to mid size and
The KH 870 II AES67 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 AES3 outputs (BNC) for up to 11 studio monitors as well as redundant AES67 network connectivity allow for flexible connectivity.
- Deep and extremely powerful bass down to 16 Hz
- The perfect complement to mid-size and large Neumann KH line studio monitors
- DSP-controlled for superior sonics and unparalleled precision
- Room correction via MA 1 Automatic Monitor Alignment (sold separately)
- Supports automatic alignment also for analog KH-line studio monitors (patented)
- Redundant AES67 audio network connectivity, multichannel signal distribution
Next Generation Subwoofer
The KH 810 II AES67 improves on its predecessor in acoustic performance and adds new features. Thanks to a novel long-throw 10” woofer with Extremely Linear Force Factor (ELFF™) technology and intelligent protection limiters, the KH 810 II ensures exceptionally low distortion even at maximum SPLs.
The KH 810 II AES67 extends low frequency reproduction down to 16 Hz and delivers about twice the output of the KH 750 DSP. This makes the KH 810 II AES67 the perfect complement to mid-sized speakers such as the KH 150 and KH 310.
The KH 810 II AES67 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, using MA 1, optimizing not only the frequency response but also the phase. Of course, the KH 810 II AES67 is also a perfect complement to Neumann’s new 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 810 II AES67 is therefore much more than “just” a subwoofer: It is the perfect tool for upgrading existing systems and/or extending them for immersive audio.
With its redundant AES67 connectivity, this subwoofer is a complete solution for integrating your entire loudspeaker setup into your Audio over IP infrastructure. The KH 870 II AES67 accepts up to 12 channels of network audio to be reproduced by the subwoofer itself and up to 11 studio monitors connected to its analog and digital outputs.
Precision in Every Detail
As subwoofers are typically placed on the floor, a robust grille protects the driver 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 810 II AES67 offers two Sub D25 connectors for analog connection as well as seven AES3 outputs (BNC) for digital connection to 11 studio monitors. All analog inputs and outputs are electronically balanced. The AES3 outputs (BNC) are compatible to S/P-DIF inputs on Neumann studio monitors using a BNC to RCA cable.
Two network ports offer redundant AES67 audio-over-IP connectivity with up to 12 input channels. The KH 810 II AES67 can thus be used as a hub, accepting multichannel audio which is distributed to the entire system using analog or AES3 (BNC) connections to up to 11 additional speakers, including its internal bass management.
The KH 810 II AES67 excels in music, film scoring, broadcast, and post-production studios for tracking, mixing, and mastering. Thanks to a novel power amp design, the KH 810 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
- Interface between the Audio over IP infrastructure in the studio and all analog or digital KH Line 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.
Features
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Ultra stiff wooden cabinet
- 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
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Two in-house modelled long-throw bass drivers with Extremely Linear Force Factor™ (ELFF™) and robust resonance optimized basket
- 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
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XLR electronically balanced analog inputs and outputs (stereo)
- Standard interfacing to professional equipment
- Daisy chain input and output for subwoofer arrays
- Two SUB-D 25 connectors for up to 11 analog output channels. The pinout follows the Tascam standard.
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Digital outputs (multichannel)
- 192 kHz, 24-bit conversion
- 7x BNC: Channels 1-3, Channels 5-12, Daisy Chain Out
- Redundant AES67 audio network ports that are fully compliant with broadcast standards such as ST 2110, ST 2022-7 redundancy, and RAVENNA. Also compatible with DANTE®-generated AES67 network streams. Network connection is required for control via MA 1 Automatic Monitor Alignment software.
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Control function
- 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.
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Universal switched-mode power supply (100 … 240 V)
- One version works in any country and is robust to poor quality mains supply.
-
Ground lift to overcome ground loops
- 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
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Low heat dissipation amplifiers with large headroom and sophisticated protection circuitry
- Improved transient response
- Assured reliability and safety
- Separate thermo limiter to protect the voice coil and power amplifier
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Soft clip and excursion limiters
- Increases system reliability
- Allows extraction of the maximum performance from the system
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Standby function
- Reduces power consumption when product is not in use.
Specifications
-
Acoustics
- Free field frequency response ±6 dB: 16 ... 750 Hz
- Free field frequency response ±3 dB: 18 ... 310 Hz
- Frequency response ripple; range, deviation: 20 ... 295 Hz, ±1.5 dB
- Self-generated noise at 10 cm (with input gain set to 100 dB SPL for 0 dBu): <20 dB(A) SPL
- Minimal self-generated noise at 10 cm Self generated noise/ Input gain setting/output gain setting: <20 dB(A) SPL
- Sine wave output with a THD < 0.5 % at 1 m in half space: 95 dB SPL (33 - 200 Hz)
- Bass capability: Max. SPL in half space at 3% THD at 1m (averaged between 50 Hz and 100 Hz): 114.9 dB
- Max. SPL for subwoofers: on floor; against the wall; in the corner: 114,9 dB; 117,9 dB; 120,9 dB
- Dolby DARDT. Max SPL bass managed: 123 dB SPL
- Acoustical Principle: Bassreflex, Ports at the front
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Analog Inputs and Outputs
- Analog input(s): 2 x XLR: electronically balanced
- Analog input impedance: >12k Ohms
- Max. input level: 24 dBu (CH 1...3, 12); 21 dBu (CH 5...11)
- Common mode rejection ratio (CMRR), XLR / Sub-D: > 56 dB @ 15 kHz
- Crosstalk (1 kHz), level matching, XLR / Sub-D: -90 dB; ±0.1 dB
- Remote volume control: via MA 1 software
- Volume control range; resolution: 0 … -∞ dB; 0.1 dB
- Analog dynamic range; THD+N (A-D-A), XLR / SubD: 120 dB(A)(CH1...3,12); 116dB(A) (CH5...11) <0.003% (-90 dB)
- Signal routing modes: analog
- Analog output(s): 2 x XLR: electronically balanced; 1 x SUB D 25: 7 x electronically balanced; 1 x SUB D 25: 4 x electronically balanced
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Digital Inputs and Outputs
- Digital input(s): 1 x BNC: Daisychain in; 1 x Ethernet: primary AoIP 1 x Ethernet: secondary AoIP
- Digital output(s): 7 x BNC: 11 x Monitor out; 1 x daisychain out
- Digital converter: resolution; design: 24 Bit
- Digital converter: sampling rate: 32 kHz..200 kHz
- Digital internal sampling rate: 48 kHz
- Output sampling rate: 48 kHz
- Dynamic range A-D: CH 1, 2=124 dBA
- Dynamic range A-D-A (Converter): CH 1, 2=121.5 dBA
- Dynamic range D-A: CH 1, 2, 3, 12=125 dBA; CH 5...11=118 dBA
- Digital sensitivity: -18 dBFS = 100 dB SPL at 1 m
- Latency ADA / DA: 2 ms (A-D-A); 4 ms (D-A AES67)
- Delay: User adjustable delay range: 0 ... 115 ms
- Delay: Resolution: time; distance: 20.8 µs; 0.71 mm (0.28 ")
- Delay: Max. frames Audio-video synchronisation (lip sync): 2 (40 ms) frames; 2.75 (33 ms) frames
- Delay: Time-of-flight maximum distance: Out of 115 ms, FW based
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User Interface
- Status Indication: Illuminated Neumann Logo
- Input Select: analog / AES67
- Ground Lift: Yes
- Control: Local; Network
- Mains Switch: Yes
- Mains Voltage: Universal Power Supply 100 V~ … 240 V~
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Electronics - Controller
- Controller design: Digital; active
- DSP resolution: 32 Bit Audio, Processing 64 Bit double precision
- Crossover frequency: 80 Hz
- Crossover slope: 24 dB/oct; 4th order
- Supports automatic room calibration via MA 1: Yes; Subwoofer and connected analog loudspeakers
- FIR phase linearization: for connected analog loudspeakers in combination with MA 1
- Protection circuitry: soft clip, peak and thermo limiters; Woofer excursion limiter; thermo limiter for the electronics and amplifiers
- Remote control: via Ethernet and MA 1
- Display: On; Normal Operation: Neumann logo “White”
- Display: Identification: Neumann logo “Rosé”
- Display: Limit / Clip / Errors / Protection /Boot Mute / Shut Down Mute: Neumann logo “Red”
- Logo Brightness: via MA 1 software
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AES67
- AES67 Audio-over-IP Interface: Fully redundant AES67 ST2110 compliant audio network interface; 2 Fast Ethernet 100Base-TX (IEEE 802.3) RJ-45 connectors; Physical redundant network (ST 2022-7)
- AES67 Audio-over-IP input word length: 24 bits
- AES67 Audio-over-IP input sampling rate: 44.1 / 48 / 88.2 / 96 kHz
- AES67 Audio-over-IP input connection management: RAVENNA, NMOS IS-04 (Discovery & Registration) and NMOS IS-05 (Connection Management)
- Sample rates: 44.1 / 48 / 88.2 / 96 kHz
- Packet times: 125 µs, 1 ms
- PTP profiles: IEEE1588 Default, AES67 PTP Media, IEEE 802.1AS (AVB)
- Other PTP profiles: SMPTE ST 2059-2
- Transport: Multicast, Unicast
- SMPTE ST 2110-30: Yes, two physical network ports
- SDP transport: Manually, SAP, RAVENNA method (RTSP)
- Discovery: SAP, mDNS, NMOS IS-04, RAVENNA method (advertising RTSP uri and other services)
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Electronics - Amplifiers and Power Supply
- Output power woofer amplifier (THD+N with limiter activated: 0.1%): 360 W
- Mains Power Supply: input voltage; frequency: SMPS: 100-240 V; 50/60 Hz
- Power consumption (230 V / 100 V): Standby: <=300mW
- Power consumption (100 V): Idle: 37 W
- Power consumption (230 V / 100 V): Idle: 37 W
- Power consumption (230 V): Idle: 36 W
- Power consumption (100 V): Full output: 485 W
- Power consumption (230 V / 100 V): Full output: 462 W
- Standby: automatic, automatic, 20 mins (default)
- Amplifier Standby: Disabled; user defined in software
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Mechanics
- Cabinet material: Wood cabinet, aluminum electronics panel
- Cabinet surface finish; color (front / back): Painted; metallic anthracite (RAL 7021) / black (RAL 9005)
- Operating conditions: +10° C to +40° C (+50° F to +104° F); <75% RH, non-condensing
- Transport/storage conditions: -25° C to +60° C (-13° F to 140° F); <90% RH; non-condensing
- Woofer: 2 x 265 mm (10") with protecting black metal grille
- Mounting points: 35 mm flange on top panel
- Dimensions (HxWxD): 737 x 330 x 645 mm (28.9" x 13" x 25.4")
- External net volume: 157 liters
- Weight: 44.5 kg (98 lbs 2 oz)
- Acoustical Axis horizontal: 165 mm
- Acoustical Axis vertical (from bottom): 365 mm
What's in the Box
- 1x KH 870 II AES67 Subwoofer
- 4x Mains Cables, black (EU/KR, UK, US and CN)
- 1x Safety Guide
- 1x Supplement “Getting Started Quickly”
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.2 ★★★★★
Based on 24 reviews
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Product Reviews
★★★★★ 5
Great Banana Plugs!
Size: 6 Pairs / 12 pcs
These FosPower banana plugs work very well. I have used dozens of these great FosPower banana plugs over the years, and they definitely work as advertised. When comparing apples to apples (or bananas in this case....lol), all Banana plugs work virtually the same way, and these banana plugs are no different. Strip speaker wire, unscrew banana plug cover, loosen speaker wire retaining screw(s), insert speaker wire, tighten speaker wire retaining screw(s), screw on banana plug cover, and wallah, a secure/conductive speaker/amplifier wire connector is created. Albeit, some banana plugs require the speaker wire to be splayed over a hollow post, and then they are held down by a screw-on retainer/cover. However, I much prefer these FosPower dual retaining screw type of banana plugs for their speaker wire holding ability.
I always use high quality 14 gauge OFC speaker wire with these FosPower banana plugs, and they work perfectly together. I have used these FosPower banana plugs with many different speaker and amplifier brands over the years, including Klipsch, Pioneer, Polk, Denon, Dayton Audio, and Fosi with no problems at all. They just work, and work well. I have never had a FosPower banana plug break, release the speaker wire or short out, in all of the years that I have used them.
Yes, these FosPower banana plugs do fit rather tightly into the connectors, at first, on a lot of speaker and amplifier brands/models. However, after the initial "squeeze" the banana plugs will lossen up, and become easier to install and remove. However, they still retain their great holding ability even after the initial squeeze. In order to overcome this initial "tightness," I usually just stick the FosPower banana plugs into a connector of an old portable amplifier, before assembling them, in order to squeeze them before inserting them into their final speaker or amplifier destinations. This is especially useful when working in tight places, where there is not much room to work in order to push the FosPower banana plugs into their tight connections firmly.
Overall, I highly recommend these FosPower banana plugs. I am currently using them all over the house and shop for home theater and music listening (and testing projects). Just be aware of the tight fit in some speakers and amplifiers. Also, the 2 very tiny speaker wire retaining screws can be a challenge sometimes. Just use a good standard blade jewelers screwdriver, and be careful not to remove the retaining screws all of the way or over-tighten them. Once these things are mastered, using these FosPower banana plugs becomes second nature. Have fun!
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Reviewed in the United States on August 28, 2024
★★★★★ 5
Great Product
Size: 6 Pairs / 12 pcs
These banana plugs have worked perfectly, no matter what gauge I have run in them, they work great. Easy assembly and great quality.
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Reviewed in the United States on May 8, 2026
★★★★★ 4
The most legit banana plugs I could find on Amazon
Size: 6 Pairs / 12 pcs, Size: 6 Pairs / 12 pcs
NEW PREFACE:: I am kind of glad I first bought the horribly magnetic, horribly made and GOLD PAINTED Sewell crimp on plugs (some reviewers say that Sewell are better and easier to use than the FosPower, which is true in design, but in quality of materials FosPower beats them hands down!!) ... Changing from those to these FosPower plugs plus the Monoprice 90° plugs, I am flabbergasted at the difference they make in sound quality. I have heard people say that they can hear the difference and even as an audiophile I was skeptical..... but my skepticism has been completely erased by what I am hearing with my own ears. I waited a few days to make sure I wasn’t just tripping before updating this review 🤣....but it has become clear to me how much a difference plugs made from the right materials actually make!!! I am 100% serious that the bass coming out of my Polk Signature Series tower speakers has at least doubled at the same volume. I can also now turn the volume up Way past my max volume before, without any distortion and much more clarity and less harsh highs. Everything just sounds warmer in general now which is amazing!!!! This is dangerous info for me... because now I’m thinking about making some really nice custom wires to see how much of a difference that makes 🙄🙄🤣 OK onto the review of the actual plugs here~~
These seem like decent connectors. I can’t tell if they are brass or copper, but they only have a slight hint of a magnetic property when testing them with a very powerful magnet. I was easily able to fit x2 - 14ga wires into it for bi-wiring purposes, including screwing on the collar. (As seen in my example pic) The gold plating on the tips seems legit and not painted like some of the plugs from Sewell... I have tested and tried quite a few plugs from Amazon and most seem to be crap. These however hold up better than most! These and the Monoprice 90° banana plugs with the black and red rubber sleeves. The latter are gold plated copper and have zero magnetic properties. (if you need 90° banana plugs)
UPDATE: still the best plugs I have found, but upon full install found two issues. One is a defect where a set of the plug threads for the barrel cover body weren’t cut right. The body’s do not tighten and stay loose because of that. Obvious issue for vibration with metal on metal...
The other issue is that even though these say they can fit different gauge wires, they seem to be geared more towards 12 or 10 gauge. I am using semi solid strand 14 gauge and find that unless I fold the wire over to make it double thick, the bolts use up all the thread and seem to become kind of loose inside the body. They won’t fully seat and keep spinning no matter how much you tighten. They seem to stay secure still but I just wonder about longevity over time with vibrations. So I just doubled up the wire and they seated fine! Not the worst issue in the world, but just kind of a pain since you have to strip the wire longer than you normally would so you can fold it over.
ANOTHER UPDATE: I had to remove these plugs from the wire to connect them to a crappy spring terminal amp while my better amp was in the shop. The issue I wrote about with the set screws "bottoming out" on smaller gauge wire became a more pronounced issue! I could not unscrew the set screws anymore and just had to cut the wires... So that means I will need to purchase more of these to replace the ones I cannot get wire back into. Not the best design, but still one of the best plugs I have found on Amazon.
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Reviewed in the United States on March 26, 2021
★★★★★ 5
Sturdy. Tight fit. No wobble
Size: 2 Pairs / 4 pcs
These are the best ones I’ve found. This order will connect one wire. Luckily that’s what I needed. If you’re doing more than one wire…
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Reviewed in the United States on May 18, 2026
★★★★★ 5
Superior Design!
Size: 6 Pairs / 12 pcs
Delivery was lightning fast.
I tried a pack of two pairs of these banana jacks as a sample to see if these would meet my needs. The design of these plugs is superior. The design was exactly what I wanted because the speaker wire is secured with TWO set screws. Then I ordered an additional six pairs of plugs to hook up my subwoofer to my amp and speakers.
(I feed the audio output from the amp to the sub. The sub has a crossover that keeps the low frequencies and sends the mid and treble frequencies to my bookshelf speakers.)
I love the security of two set screws on each plug and love the barrel that screws on AFTER the wire is secured by the set screws. Most banana plugs have a hole through the shaft of the plug that receives the stripped wire. Then the barrel cover is screwed down to secure the wire in the plug. This design compresses the speaker wire but eventually the cap loses it grip and allows the connection between the wire and the plug to become loose. Then the transfer of the audio signal becomes poor and the speakers sound bad. Every month or two I needed to check all the banana plugs and re-tighten many of them for the best performance. The two set screws eliminate this problem. The set screws are quite small and take a little extra care in installation. You will need a small flat blade screwdriver to tighten them. I used the 1/8" flat blade driver from a set of jewelers screwdrivers.
These well made plugs are a bit pricier that many of the banana plugs available but certainly not the priciest plugs available. For me, the slightly higher price was more than offset by the security of the wire within the plug.
I'm not thrilled with the extra tight fit of the tip on the plugs into the jacks. It took a lot of effort to insert the in the jack. Actually I "greased" the pins (very sparingly) with with non-corrosion, conductive paste (Ox-Gard, No-Corrode, etc. Do NOT use any other grease.) Next time I'll use pliers to compress the pin.
My only quibbles are that the spring pins that go into the jack are very tight and that the plugs are only sold in quantities of two pairs or 12 pairs.
I recommend these banana plugs for all who are using the banana plugs and jacks for hooking up your speakers. It's a very convenient way of connecting speakers if your speakers and amplifier have the banana jack as part of the binding post. Further, it's much safer to use banana plugs since the possibility of shorting your amplifier with a stray strand of wire is practically zero. Easy Five Stars.
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Reviewed in the United States on April 13, 2018