Neumann KH 750 Manuel utilisateur

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KH 750 AES67

A S S

 . / . B M™

. /

/

I M

KH 750 DSP | 2

The KH 750 AES67 subwoofer ...............................................3

Delivery includes ..........................................................3

About this manual..........................................................3

Product overview ..........................................................4

Installing and connecting the KH 750 AES67 ..................................6

Preparing the subwoofer ...............................................6

Preparing the room....................................................7

Setting up the subwoofers..............................................7

Positioning the subwoofers.............................................8

Connecting the subwoofer..............................................9

Connecting network cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Connecting/disconnecting the subwoofer to/from the mains power supply ...15

Conﬁguring and using the KH 750 AES67 ....................................16

Switching the subwoofer on/o ........................................16

Functionality of the back panel lights ...................................16

INPUT SELECT switch.................................................17

CONTROL MODE switch ...............................................17

Resetting the KH 750 AES67 ...........................................17

Firmware update.....................................................17

Calibrating the subwoofer.............................................18

Compensating for larger time of ﬂight (TOF) dierences ..................20

Using the bass management ...........................................20

Remote-controlling the bass management ...............................21

Setting the replay level of the subwoofer................................21

Activating ground lift .................................................22

Conﬁguring AES67 network and audio settings ...............................23

Initial setup.........................................................23

Selecting the control mode and audio input..............................23

Setting up the AES67 network interface .................................24

Setting up the PTP media clock ........................................28

Setting up the connection management mode ............................29

Routing AES67 audio signals to the KH 750 AES67........................31

Compatibility with DANTE AES67 audio streams ........................36

Cleaning and maintaining the subwoofer.....................................37

Troubleshooting ..........................................................38

Speciﬁcations ............................................................39

Pin assignment of the XLR socket ...........................................39

Acoustical measurements and block diagram.................................39

Trademarks ..............................................................39

Technical information & glossary ...........................................40

Contents

KH 750 DSP | 3

The KH 750 AES67 subwoofer

Thank you for purchasing a Neumann subwoofer. Neumann subwoofers are designed to com-

plement Neumann’s extensive range of monitors. They can be used in music, broadcast, and

post production studios for tracking, mixing, mastering, and home recording. They can be

positioned away from a wall, next to a wall or in a corner and can be mixed freely with other

loudspeakers and subwoofers from the Neumann Studio Monitor Systems range.

This AES67 variant of the KH 750 DSP subwoofer supports AES67 digital audio signals and acts

as an interface in an existing AES67 audio infrastructure in the studio. The integrated redun-

dant AES67 audio network ports are fully compliant with ST 2110 and ST 2022-7 broadcast

standards. At the same time, the KH 750 AES67 is compatible with DANTE-generated AES67

network streams.

The built-in 2.0 / 0.1 Bass Manager can be used in many ways as there are four routing modes

to ensure maximum ﬂexibility when using the subwoofer - see “Uses” below. Fourth order

crossovers and ﬂexible acoustical controls allow for seamless system integration and the bass

management function can be remotely controlled.

State-of-the-art circuitry design and the specially developed long excursion bass driver 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.

The KH 750 AES67 is also compatible with the MA 1 - Automatic Monitor Alignment software.

Uses

• Bass extension for loudspeakers

• Increasing the maximum SPL of loudspeakers

• Decreasing harmonic and intermodulation distortion of loudspeakers

• Reproducing the LFE channel

• Reproducing the “Sub” signal of a bass managed multichannel source

• Working as an extension for KH 810, KH 870 and KH 805 subwoofer systems

• Support of stereo sources with analog XLR or digital AES3 format and AES67 audio over IP

signals in up to 8 channels

• Working as an interface between digital AES3 and AES67 studio infrastructure and all ana-

log Neumann KH studio monitors

• Providing automatic monitor alignment for the entire loudspeaker setup via the MA 1 soft-

ware for Mac and PC

Delivery includes

1 KH 750 AES67 subwoofer

4 Rubber feet

4 Mains cables (EU/KC, UK, US, CCC versions)

1 Quick guide

1 Safety guide

About this manual

This operating manual describes the physical setup and autonomous operation of the

KH 750 AES67. It also describes how to process Audio over IP via AES67 and Ravenna.

For the best possible conﬁguration and calibration of the subwoofer we recommend the MA 1 -

Automatic Monitor Alignment software.

KH 750 DSP | 4

The current operating manual as well as the quick guide and the safety guide can also be

downloaded from the “Downloads” area on the product page at www.neumann.com.

Note that imperial dimensions are approximate.

Product overview

1 Neumann logo

2 Metal grille

KH 750 DSP | 5

78 6 5

HIJ

3 MAINS POWER switch

4 IEC mains socket with protective ground contact

5 LOW CUT potentiometer

6 Redundant ETHERNET sockets

PRIMARY | AES67 AUDIO AND CONTROL NETWORK

SECONDARY | AES67 AUDIO

7 XLR3-M sockets

ANALOG OUTPUT | LEFT/A

ANALOG OUTPUT | RIGHT/B

8 XLR3-F sockets

ANALOG INPUT | LEFT/A

ANALOG INPUT | RIGHT/B

9 BNC sockets

DIGITAL | AES3 INPUT

DIGITAL | AES3 OUTPUT

0 INPUT GROUND LIFT switch

A SUBWOOFER GAIN | OUTPUT LEVEL switch

B SUBWOOFER GAIN | INPUT GAIN potentiometer

C SUBWOOFER PHASE switch

D SUBWOOFER PHASE switch

E BASS MANAGEMENT switch

F BASS MANAGEMENT LED

• green = active

G INPUT SELECT switch

H POWER ON LED

• green = on

• red = protection active

• amber = indication

I CONTROL MODE switch

J CHANNEL B INPUT MODE switch

KH 750 DSP | 6

Installing and connecting the KH 750 AES67

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 stan-

dards, 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.

Always have the product mounted by a qualiﬁed specialist according to local, national

and international regulations and standards.

Use the mounting systems recommended by Neumann and always provide sucient addi-

tional protection against tipping or dropping by means of safety wires.

CAUTION

Damage to the product due to overheating!

If air cannot circulate properly around the rear of the subwoofer, 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.

XThe whole of the back panel should have a free ﬂow of air to ensure good cooling.

XWhen 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.

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” sec-

tion at www.neumann.com.

Preparing the subwoofer

CAUTION

Risk of staining surfaces!

Some surfaces treated with varnish, polish or synthetics may suer from stains when they

come into contact with other synthetics. Despite a thorough testing of the synthetics used

by us, we cannot rule out the possibility of staining.

XDo not place the KH 750 AES67 on delicate surfaces.

To place the subwoofer on a ﬂat surface:

Attach the supplied self-adhesive feet to the bottom of the cabinet, about 2-3 cm (1") from

the edges.

This reduces the risk of scratching the surface and acoustically isolates the subwoofer from

the surface.

XAlternatively, the feet can be stuck onto the side of the cabinet if that helps with mounting

the product in the room.

If you want to hide the subwoofer:

XUse a thin open weave cloth. To provide visual cover, you can use two layers of the cloth.

KH 750 DSP | 7

Preparing the room

Arrange all acoustically relevant surfaces and objects symmetrically on either side of the

listening axis of the room (left/right).

XMinimize the sound that is reﬂected back to the listening position by using angled surfaces

and/or acoustical treatment.

The subwoofer can delivery very low frequencies at high levels which can lead to objects and

parts of the room structure to rattle. Ensure that rattling and resonating surfaces are avoided.

This product has been optimized for use in recording studios. In order to avoid aecting

the quality of reproduction, make sure that the product is used in an EMC environment.

Setting up the subwoofers

Choosing the type of setup

The driver is 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 or placing it directly against the wall oers

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 when ﬂush mounted.

If you want to ﬂush mount the subwoofer into a wall recess:

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 around the rear of the subwoofer.

Using one or several subwoofers

XUse ...

one subwoofer several subwoofers

... if your room does not oer sucient

space for several subwoofers.

... if you require a higher output power

or less distortion with the same output

power.

... to suppress lateral modes or cross

modes in the room by means of a Plane

Wave Bass Array (PWBA™).

... if many smaller cabinets are easier to

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.

If several subwoofers are used, they must be controlled parallelly by using Y cables

(analog inputs) to feed the signals to all subwoofers.

Alternatively, the same AES67 source stream can be routed to multiple subwoofers.

KH 750 DSP | 8

Positioning the subwoofers

Regardless of whether you are setting up one or several subwoofers:

Always ensure that the distance dwall between the wall behind the subwoofer and the sub-

woofer’s front is less than 0.8 m.

If you are setting up one subwoofer:

Position the subwoofer against the front wall, left or right of the middle of the front wall

ideally at 1/4 or 3/4 of the room width.

XDo not place the subwoofer at the side wall or rear wall of the room as sometimes proposed

for domestic applications.

If you are setting up several subwoofers as a Plane Wave Bass Array™(PWBA™):

XUse two to four subwoofers for smaller rooms and three to four subwoofers for larger rooms.

XSet up the subwoofers along the front wall within half a wavelength of the upper cut o fre-

quency of each other. The maximum spacing of the subwoofer cabinets is determined by the

setting of the routing mode or crossover frequency (see page 21):

Setting Max. spacing of the subwoofer cabinets

RIGHT approx. 2 m (6'6")

EXTERNAL BASS MANAGEMENT depends on crossover frequency setting in the

source equipment, for 80 Hz approx. 2 m (6'6")

LFE-MODE 1 approx. 1.4 m (4'6")

LFE-MODE 2 approx. 2 m (6'6")

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.

You can correct excessive low frequency energy in the room using the potentiometer

SUBWOOFER GAIN| INPUT GAIN Band the switch SUBWOOFER GAIN | OUTPUT LEVEL A

(cf. page41).

If you set up several subwoofers, you can utilize their mutual coupling to achieve an acoustical

gain. The following acoustical gains are possible:

Number of subwoofers Acoustical gain

10.0 dB

26.0 dB

39.5 dB

412.0 dB

dwall

Utilizing the

acoustical gain

KH 750 DSP | 9

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 direc-

tion the subwoofer is oriented when placed in the listening environment.

For your loudspeakers, however, an accurate positioning and orientation is vital.

XPosition your loudspeakers as follows:

System Position and orientation

2.0 (stereo) ±30°

5.1 ITU-R BS.775-1:

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 dierences will occur.

XAvoid distance dierences of > 2m (6'6").

Compensate for time-of-ﬂight dierences as described in the chapter “Calibrating the phase”

on page 19.

Connecting the subwoofer

Signal

(source connector) Source

impedance Cable length Subwoofer connection method

Analog (RCA) low up to 10 m

(30')

via an adapter (RCA-XLR)

to the ANALOG INPUT socket (XLR)

8 (see below)

Analog (XLR) low up to 100 m

(300')

directly to the ANALOG INPUT

socket (XLR) 8 (see below)

AES3 (BNC) 75 Ω up to 100 m

(300')

directly to the DIGITAL INPUT

socket (BNC)9 (see page 11)

AES3 (XLR) 110 Ω up to 100 m

(300')

via an impedance converter and an

adapter (XLR-BNC) to the DIGITAL

INPUT socket (BNC)9(see page

11)

S/P-DIF (RCA) 75 Ω up to 10 m

(30')

via an adapter (RCA-BNC) to the

DIGITAL INPUT socket (BNC)9 (see

page 11)

AES67 (RJ-45) 100Base-T;

1000Base-T

(recommen-

ded)

depending on

CAT type of

the cable

via Ethernet connectors (RJ-45)

The default signal selection is AES67. To select AES3 or analog, set the INPUT SELECT switch

to ANALOG and AES3. If a valid digital AES3 signal is connected to the BNC input, this digital

signal is automatically selected.

Note: The Neumann.Control iPad App does not support the KH 750 AES67 subwoofer.

Note: If the source equipment is digital, we recommend using digital connections from the

source to the subwoofer as this avoids additional unnecessary signal conversions.

KH 750 DSP | 10

Connecting analog signals to the KH 750 AES67

Use balanced XLR cables to connect the corresponding sockets ANALOG INPUT 8of the

KH 750 AES67 to the audio source.

XUse 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)

1Audio ground

2Signal +

3Signal -

The level delivered by devices with RCA outputs (-10 dBV) is usually less than the studio

level (+4 dBu):

If necessary, use active unbalanced-to-balanced converters in order to be able to connect

devices with unbalanced signals.

XWe do not recommend passive unbalanced to balanced converters using transformers. They

usually limit low frequency levels and increase high frequency distortion.

Connecting digital AES3 signals to the KH 750 AES67

Connect the digital AES3 or S/P-DIF-output signal of your audio source to the DIGITAL INPUT

socket 9of the respective KH 750 AES67. See picture below.

The KH 750 AES67 subwoofer only supports non-encoded AES3 and S/P-DIF sig-

nals. Encoded signals such as MP3, DTS or Dolby Digital are not supported.

Only one cable is needed for uncompressed AES3 and S/P-DIF digital signals

(single-wire mode). They contain two audio channels: “subframe A” and “sub-

frame B”. Usually, the audio channels are:

Subframe A Subframe B

Left Right

Center LFE

Surround left Surround right

Back left Back right

A clock input is not required because subwoofers are not audio sources and the

converters are clocked to a very stable internally generated clock source.

Use a Neutrik NADITBNC-F impedance and level converter (not supplied) for XLR to BNC

conversions of AES3-signals. This method brings impedance matching, level matching and

source-receiver isolation. The Neutrik NADITBNC-F converter is guaranteed to work up to

48kHz. Only one converter is needed per digital signal cable.

XUse the following wiring if you want to make your own converter:

CAUTION

Damage to the product due to high AES3 signal levels!

AES3 signal levels in XLR cables are much too high for the DIGITAL INPUT socket

(BNC)9. If you connect such signals without reducing the signals’ level, damage to the

product will occur.

XAlways make sure that your converter is able to match impedance and level.

Connecting

unbalanced

cables

Connecting

AES3 cables

Ce manuel convient aux modèles suivants

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