KH 810/870
Active Subwoofer
with 7.1 High Definition Bass Management™
Operating Manual
georg neumann gmbh · ollenhauerstr. 98 · 13403 berlin · germany
tel +49 (0)30 / 41 77 24-0 · fax -50 · headoffice@neumann.com · www.neumann.com
Contents
Important safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. . . . . . . . . . . .
The KH 810/870 subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4. . . . .
Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Delivery includes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
.4. . . . . . . . . . . . |
Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5. . .
Installing and connecting the KH 810/870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Preparing the subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Preparing the room . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Setting up the subwoofers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Connecting the subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Using the KH 810/870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Switching the subwoofer on/off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17. . . . . . .
Calibrating the subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Compensating for larger time of flight (TOF) differences . . . . . . . . . . . . .20. . . . .
Using the bass management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Boosting the LFE channel and adjusting the LFE mode . . . . . . . . . . . . . . . . . . . . .20
Activating ground lift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Remote-controlling the system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Resetting the settings of the KH 810/870 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Cleaning and maintaining the subwoofer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Troubleshooting . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25. . . . . . . . . . . . . |
Specifications . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26. . . . . . . . . . . . |
Accessories . . . . . . . |
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28. . . . . . . . . . . . . |
Manufacturer Declarations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Technical information & glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30. . . . . . . . .
Appendix
System block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
Pin assignment of the XLR socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I. . . . . . . . . . .
Pin assignment of the REMOTE CONTROL AND RS-232 socket . . . . . . . . . . . . . . . |
. . . I |
Acoustical measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . |
II. -IV |
EN
KH 810/870 | 1
Important safety instructions
EN
1.Read these instructions..
2.Keep these instructions.. Always include these instructions when passing the product on to third parties..
3.Heed all warnings..
4.Follow all instructions..
5.Do not use this apparatus near water..
6.Only clean the product when it is not connected to the mains power supply.. Clean only with a dry cloth..
7.Always ensure a free air flow through the ventilation openings on the rear of the product.. Install in accordance with the manufacturer’s instructions..
8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat..
9.Do not defeat the safety purpose of the polarized or grounding-type plug.. A polarized plug has two blades with one wider than the other.. A grounding type plug has two blades and a third grounding prong.. The wide blade or the third prong are provided for your safety.. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.. Always connect to a mains socket outlet with a protective earthing connector..
10.Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus..
11.Only use attachments/accessories specified by the manufacturer..
12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus.. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over..
13.Unplug this apparatus during lightning storms or when unused for long periods of time..
14.Refer all servicing to qualified service personnel.. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, when the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped..
15.To completely disconnect this apparatus from the AC mains, disconnect the power supply cord plug from the AC receptacle..
16.WARNING: To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture..
17.Do not expose this equipment to dripping or splashing and ensure that no objects filled with liquids, such as vases, are placed on the equipment..
18.The mains plug of the power supply cord shall remain readily accessible..
Hazard warnings |
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Presence of uninsulated dangerous voltage within the product’s enclo- |
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there is a risk of electric shock. . There are no user serviceable parts |
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inside.. Refer servicing to your Neumann service partner.. |
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Read and follow the safety and operating instructions contained in the |
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operating manual.. |
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2 | KH 810/870
Installation
High sound pressure levels
Magnetic fields
Intended use
•Ensure that the room in which you use this product is wired in accordance with the local electrical code and checked by a qualified inspector..
•Only use the product indoors..
•Do not install the product in hot, humid, or excessively dusty locations, in direct sunlight or in locations where it is exposed to externally generated vibrations..
•Do not place burning objects (e..g.. candles) on top of or near the product..
•If condensation has formed on the product, e..g.. because it was moved from a cold environment to a warm one, allow the product to acclimatize to room temperature before using it..
•Do not overload wall outlets and extension cables as this may result in fire and electric shock..
WARNING
Danger of hearing damage due to sudden high sound pressure levels!
Audio signals that are present at switch-on of the product or that can be present during operation, can create sudden, very high sound pressure levels which can damage your hearing..
XX Always lower the output level of the audio source before connecting it to the subwoofer or starting it (pressing “play”)..
This subwoofer can be used for commercial purposes.. Commercial use is subject to the rules and regulations of the trade association responsible.. Neumann, as the manufacturer, is therefore obliged to expressly point out possible health risks arising from use.. This subwoofer is capable of producing sound pressure levels exceeding 85 dB(A) SPL.. This is the sound pressure corresponding to the maximum permissible level which is by law (in some countries) allowed to affect your hearing for the duration of a working day (8 hours).. It is used as a basis according to the specifications of industrial medicine.. Higher sound pressure levels and/or longer durations can damage your hearing..
At higher sound pressure levels, the duration must be shortened in order to prevent hearing damage.. The following are signs that you have been subjected to excessive sound pressure levels for too long a time..
•You can hear ringing or whistling sounds in your ears..
•You have the impression (even for a short time only) that you can no longer hear high frequencies (temporary threshold shift)..
WARNING
Interference due to magnetic fields!
This product generates stronger permanent magnetic fields that can interfere with cardiac pacemakers and implanted defibrillators (ICDs)..
XX Always maintain a distance of at least 4" (10 cm) between the subwoofer and the cardiac pacemaker or implanted defibrillator..
Intended use of the product includes:
•having read this operating manual, especially the chapter “Important safety instructions”,
•using the product within the operating conditions and limitations described in this operating manual..
“Improper use” means using the product:
•other than as described in this operating manual, or
•under operating conditions which differ from those described herein..
This will invalidate the guarantee..
EN
KH 810/870 | 3
The KH 810/870 subwoofer
Thank you for purchasing a Neumann subwoofer.. Neumann subwoofers are designed to complement Neumann’s extensive range of monitors.. They can be used in music, broadcast, and post production studios for tracking, mixing, and mastering.. They can be positioned next to a wall or flush mounted into a wall, and can be mixed freely in multi-channel systems with other loudspeakers and subwoofers from the Neumann Studio Monitor Systems range..
The built-in 7..1 Channel High Definition Bass Manager™ is compatible with all formats, from mono to the latest 7..1 High Definition systems.. Eight analog channels ensure flexible interconnectivity for modern studios.. Four-mode LFE channel processing ensures maximum compatibility across all formats.. 4th order crossovers and flexible acoustical controls allow for seamless system integration.. The built-in volume control allows for centralized system adjustment independent of the source..
The latest high efficiency amplifiers and acoustical components have been used to ensure the most accurate sound reproduction possible.. Neumann products are designed for longevity so we hope you enjoy many happy years of using this product..
Compatibility
The 7..1 Channel High Definition Bass Manager™ is compatible with the following formats:
•7..1, 7..0 HD (Blu-ray, video gaming)
•7..1 Theatrical (5 front channels)
•6..1, 6..0 (DVD, DVD Audio, SACD)
•5..1, with an additional 2..0 2-channel stereo system
•5..1, 5..0 (DVD, multi-channel CD, HDTV, video gaming)
•3/1..0 (LCRS)
•2..0 (2-channel stereo, reproduced with or without a subwoofer)
•1..0 (mono)
Larger audio systems can be built using several subwoofers..
Delivery includes
1 KH 810 subwoofer or KH 870 subwoofer
3 Mains cables (European, UK and US version)
1 Operating manual
1 Supplement “Getting Started Quickly”
EN
The current operating manual as well as the supplement “Getting Started Quickly” can also be downloaded from the “Downloads” area on the product page at www..neumann..com..
Note that imperial dimensions are approximate..
4 | KH 810/870
Product overview
1
2
3 |
3 |
1Neumann logo
2Metal grille
3Bass reflex ports
EN
KH 810/870 | 5
EN
INPUT |
PIN 1 CONNECTED |
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GROUND LIFT |
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INPUT OUTPUT
SURROUND RIGHT CENTER LEFT
LEFT
ACTIVE STUDIO SUBWOOFER
7.1 CHANNEL HIGH DEFINITION BASS MANAGER
SERIAL NUMBER
DESIGNED IN GERMANY - MADE IN IRELAND
PARAMETRIC 
EQUALIZER
CAUTIONS AND WARNINGS
RIGHT SURROUND |
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LEFT BACK |
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RIGHT BACK |
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DIRECT IN LFE / SUM |
SUM |
All safety and warning notices found in the user manual should be observed. Specifically, do not expose to moisture, liquids, flames, heat, vibration, dust, or direct sunlight. Do not block or cover heatsinks or vents, and leave adequate space for ventilation.
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Check mains power voltage selection |
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before connecting to correctly earthed |
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mains power. |
-12 |
There are no user serviceable parts |
40 Hz |
inside this product. Repairs should only be performed by authorized service personnel. Options and accessories are fitted at the user's own risk.
This loudspeaker is capable of producing a sound pressure level in excess of 85 dB. This may cause permanent hearing damage so user caution is recommended. Noise exposure is a function of SPL and time, so observe local regulations when listening at high levels for a long time. Hearing protection may be required.
AC 220-240 V
MAINS VOLTAGE
SELECTION
AC 100-120 V
ON
MAINS POWER
OFF
OPTIONAL
REMOTE
POWER
ON / OFF
AC 100-120 V / 220-240 V
~ 50-60 Hz
Internal fuse type and rating: 5x20 mm SB 5.0 A
Max. power consumption: 290 W (KH 810) / 550 W (KH 870)
8 9 0 A B
4MAINS VOLTAGE SELECTION switch
5MAINS POWER switch
6OPTIONAL REMOTE POWER ON/OFF socket
7IEC mains socket with protective ground contact
8Sockets
INPUT | LEFT, CENTER, RIGHT
INPUT | LEFT SURROUND, RIGHT SURROUND INPUT | LEFT BACK, RIGHT BACK
9INPUT | DIRECT IN / LFE /SUM socket
0 OUTPUT | SUM socket
ASockets
OUTPUT | LEFT, CENTER, RIGHT
OUTPUT | LEFT SURROUND, RIGHT SURROUND OUTPUT | LEFT BACK, RIGHT BACK
BREMOTE CONTROL AND RS-232 socket
4
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6
7
6 | KH 810/870
C D E F G
INPUT |
PIN 1 CONNECTED |
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GROUND LIFT |
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INPUT OUTPUT
LEFT |
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CENTER |
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RIGHT |
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LEFT SURROUND |
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RIGHT SURROUND |
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LEFT BACK |
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RIGHT BACK |
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DIRECT IN LFE / SUM |
SUM |
AC 220-240 V
MAINS VOLTAGE
SELECTION
AC 100-120 V
ACTIVE STUDIO SUBWOOFER
7.1 CHANNEL HIGH DEFINITION BASS MANAGER
SERIAL NUMBER
DESIGNED IN GERMANY - MADE IN IRELAND
PARAMETRIC 
EQUALIZER
CAUTIONS AND WARNINGS
All safety and warning notices found in the user manual should be observed. Specifically, do not expose to moisture, liquids, flames, heat, vibration, dust, or direct sunlight. Do not block or cover heatsinks or vents, and leave adequate space for ventilation.
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Check mains power voltage selection |
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before connecting to correctly earthed |
0 |
mains power. |
-12 |
There are no user serviceable parts |
40 Hz |
inside this product. Repairs should only be performed by authorized service personnel. Options and accessories are fitted at the user's own risk.
This loudspeaker is capable of producing a sound pressure level in excess of 85 dB. This may cause permanent hearing damage so user caution is recommended. Noise exposure is a function of SPL and time, so observe local regulations when listening at high levels for a long time. Hearing protection may be required.
ON
MAINS POWER
OFF
OPTIONAL
REMOTE
POWER
ON / OFF
AC 100-120 V / 220-240 V
~ 50-60 Hz
Internal fuse type and rating: 5x20 mm SB 5.0 A
Max. power consumption: 290 W (KH 810) / 550 W (KH 870)
CINPUT GROUND LIFT switch
DVentilation openings
EPOWER ON LED (red)
•lights up red: subwoofer is switched on and ready for operation
•flashes red slowly: protection system is active, output level is reduced by 6 dB
•flashes red rapidly: subwoofer booting-up just after switch-on
•is off: subwoofer is switched off
FBASS MANAGEMENT LED (green)
•lights up green: bass management activated
•is off: bass management disabled
GBASS MANAGEMENT switch
HREAR CH BASS MANAGEMENT switch
IVOLUME CONTROL switch
JTEST SIGNAL switch
KSUBWOOFER GAIN | OUTPUT LEVEL switch
LSUBWOOFER GAIN | INPUT GAIN potentiometer
MSUBWOOFER PHASE switch
NSUBWOOFER PHASE rotary switch
OPARAMETRIC EQUALIZER switch
PPotentiometers
PARAMETRIC EQUALIZER | GAIN PARAMETRIC EQUALIZER | Q PARAMETRIC EQUALIZER | FREQUENCY
QLOW CUT potentiometer
RLFE GAIN switch
SLFE MODE rotary switch
H
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J
K
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M
N
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P
Q
R
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D
EN
KH 810/870 | 7
Installing and connecting the KH 810/870
Have the product installed and connected by a specialist.. Due to his/her technical training, know-how and experience as well as knowledge of relevant provisions, regulations and standards, the specialist must be able to assess assigned tasks, recognize potential hazards and ensure appropriate safety measures. . The following safety and mounting instructions are addressed to this specialist..
CAUTION
Danger of injury and material damage due to tipping/dropping of the product!
If improperly mounted, the product and/or the mounting hardware (e..g.. rack) can tip over or drop down..
XX Always have the product mounted by a qualified specialist according to local, national and international regulations and standards..
XX Use the mounting systems recommended by Neumann and always provide sufficient additional protection against tipping or dropping by means of safety wires..
CAUTION
Damage to the product due to overheating!
If air cannot circulate properly through the ventilation openings D on the rear of the product, the power amplifiers may overheat leading to premature activation of the thermal protection system which limits the maximum output level of the subwoofer.. In rare cases, damage to the product may also occur..
XX Never cover the ventilation openings D..
XX When installing the product into tight spaces such as wall recesses, maintain an air gap of at least 2" (5 cm) around the subwoofer’s backplate to ensure a free air flow through the ventilation openings..
For information on installation, please refer to the supplied “Getting Started Quickly” supplement.. This will help you set up the subwoofers and loudspeakers in a way that will give you the best acoustic performance from the system.. For further information on setting up subwoofers and loudspeakers, please refer to the “Questions & Answers” section at www..neumann..com..
Preparing the subwoofer
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CAUTION |
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Risk of staining surfaces! |
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Some surfaces treated with varnish, polish or synthetics may suffer from stains when they |
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come into contact with other synthetics.. Despite a thorough testing of the synthetics used |
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by us, we cannot rule out the possibility of staining.. |
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XX Do not place the KH 810/870 on delicate surfaces.. |
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The bottom of the subwoofer features rubber feet which reduce the risk of scratching the sur- |
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face and the subwoofer cabinet, and acoustically isolate the subwoofer from the surface.. |
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If you want to hide the subwoofer: |
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EN |
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XX Use a thin open weave cloth.. To provide visual cover, you can use two layers of the cloth.. |
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Preparing the room |
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XX Arrange all acoustically relevant surfaces and objects symmetrically on either side of the |
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listening axis of the room (left/right).. |
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XX Minimize the sound that is reflected back to the listening position by using angled surfaces |
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and/or acoustical treatment.. |
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This product has been optimized for use in recording studios.. In order to avoid affecting |
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the quality of reproduction, make sure that the product is used in an EMC environment.. |
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8 | KH 810/870
Setting up the subwoofers
Choosing the type of set up
The bass reflex ports are located on the front panel of the subwoofer, allowing the subwoofer to be either set up in a room or flush mounted into a wall recess..
Flush mounting the subwoofer into a wall recess offers the following advantages:
•A solid wall boosts the level of the subwoofer in the room which can be compensated by reducing the output level of the subwoofer.. This also reduces distortion resulting in a cleaner sound reproduction..
•Reflections from the wall behind the subwoofer are eliminated so that the frequency response becomes smoother..
•The subwoofer does not occupy space in the room..
If you want to flush mount the subwoofer into a wall recess:
XX Have the wall constructed by an experienced acoustical engineer.. At least the following points should be observed:
•The wall should be solid (stone, brick, concrete, several layers of gypsum or MDF)..
•Ensure a free air flow through the ventilation openings D on the rear of the subwoofer (see warning note on page 8) or remote locate the subwoofer electronics using the Neumann REK 3 remote electronics kit and an SC cable (available in different lengths, see “Accessories” on page 28)..
Using one or several subwoofers
XX Use .... .
one subwoofer |
several subwoofers |
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.... . if your room does not offer sufficient |
.... . if you need to move left and right |
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space for several subwoofers.. |
along the mixing console, or if there are |
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.... . if you prefer an easier installation of |
several listening positions along a large |
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format mixing console.. |
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your system.. |
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.... . if you require a higher output power |
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or less distortion with the same output |
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power.. |
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.... . to suppress lateral modes or cross |
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modes in the room by means of a Plane |
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Wave Bass Array (PWBA™).. |
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.... . if many smaller cabinets are easier to |
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position than one large cabinet.. |
To reduce low-frequency distortion, the uncalibrated output level of your subwoofer should always be higher than the output level of your loudspeakers.. We recommend using arrays with several subwoofers, in which case the uncalibrated maximum output level of the subwoofer array should also be higher than the maximum output level of all the loudspeakers in the system.. The subwoofers can then be calibrated to a lower output level resulting in lower distortion and correspondingly cleaner low-frequency reproduction.
For information on building a balanced system, please refer to the “Product Selection Guide” at www..neumann..com..
EN
KH 810/870 | 9
Positioning the subwoofers
Regardless of whether you are setting up one or several subwoofers:
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XX Always ensure that the distance dwall between the wall behind the subwoofer and the sub- |
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woofer’s front is less than 0..8 m.. |
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If you are setting up one subwoofer: |
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XX Position the subwoofer against the front wall, slightly left or right of the middle of the front |
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wall and between the left and right loudspeakers.. |
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If you are setting up several subwoofers as a Plane Wave Bass Array™ (PWBA™): |
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XX Use two to four subwoofers for smaller rooms and three to four subwoofers for larger rooms.. |
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XX Set up the subwoofers along the front wall within half a wavelength of each other.. The max- |
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imum spacing of the subwoofer cabinets is determined by the setting of the LFE mode |
(see page 20): |
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Setting |
Max. spacing of the subwoofer cabinets |
LFE → SUB + L/R (>80) |
approx.. 2 m (6'6") |
LFE → SUB ONLY (<80) |
approx.. 2 m (6'6") |
LFE → SUB ONLY (<120) |
approx.. 1..4 m (4'6") |
DIRECT IN → SUB ONLY |
approx.. 1..4 m (4'6") |
If you observe the stated spacing, the subwoofers form a cylindrical source and generate a plane wave down the room, a so-called Plane Wave Bass Array™ (PWBA™).. The PWBA™ reduces stationary waves between the side walls, improves the bass reproduction and suppresses lateral room resonances..
For examples of set up positions and distances, please refer to the supplied “Getting Started Quickly” supplement..
You can correct excessive low frequency energy in the room using the potentiometer SUBWOOFER GAIN | INPUT GAIN L and the switch SUBWOOFER GAIN | OUTPUT LEVEL K (cf.. page 31)..
Utilizing the If you set up several subwoofers, you can utilize their mutual coupling to achieve an acoustical acoustical gain gain.. The following acoustical gains are possible:
Number of subwoofers |
Acoustical gain |
1 |
0..0 dB |
2 |
6..0 dB |
3 |
9..5 dB |
4 |
12..0 dB |
Positioning and orienting subwoofers and loudspeakers
Subwoofers are omni-directional in their typical pass band as the generated wavelength is long compared to the surface producing the sound, therefore it does not matter in which direction the subwoofer is oriented when placed in the listening environment..
EN
10 | KH 810/870
Connecting unbalanced cables
For your loudspeakers, however, an accurate positioning and orientation is vital.. XX Position your loudspeakers as follows:
System |
Position and orientation |
2..0 (stereo) |
±30° |
5..1 |
ITU-R BS..775-1: |
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0°, ±30°, ±110° (±10°) |
|
(center, front left/right, surround left/right) |
|
ANSI/SMPTE 202M: |
|
0°, ±22..5°, arrays to the surround left and to the surround right, |
|
plus optional subwoofer(s) |
6..1 |
as 5..1 systems plus 180° (back center) |
7..1 |
0°, ±30°, ±90°, ±150° |
|
(center, front left/right, side left/right, back left/right) |
For detailed information on the positioning and orientation of your loudspeakers, please refer to the operating manuals of the loudspeakers..
If your subwoofers cannot be placed at the same distance from the listening position as the loudspeakers, time-of-flight differences will occur..
XX Avoid distance differences of > 2 m (6'6")..
XX Compensate for time-of-flight differences as described in the chapter “Calibrating the phase” on page 19..
Connecting the subwoofer
Connecting the subwoofer to an audio source
XX Use balanced XLR cables to connect the corresponding sockets INPUT 8 of the KH 810/870 to the audio source..
XX Use an XLR adapter (not supplied) to connect unbalanced cables (e..g.. RCA cables).. Use the following wiring if you want to make your own XLR adapter:
Wiring |
|
Pin |
Signal |
Output (RCA) |
Input (XLR-M) |
1 |
Audio ground |
|
|
2 |
Signal + |
|
|
3 |
Signal - |
The level delivered by devices with RCA outputs (-10 dBV) is usually less than the studio level (+4 dBu):
XX If necessary, use active unbalanced-to-balanced converters in order to be able to connect devices with unbalanced signals..
EN
KH 810/870 | 11
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