Neumann KH 420 - User Manual

04/14 – 554622GEORG NEUMANN GMBH · LEIPZIGER STR. 112 · 10117 BERLIN · GERMANY
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Getting Started Quickly
0°
-110°
-30°
-120°
-100°
110°
30°
120°
100°
Place the loudspeakers at the correct angle
(ITU-R BS.775-1)
Place the loudspeakers at the same distance
Horizontal: Point loudspeakers at listening position
Use the acoustical axis as a reference
r
For 2-channel stereo use ±30°
Delay closer loudspeakers by 30 µs/cm (76 µs/inch)
Use the furthest loudspeaker as a reference
0°
-30°
-150°
-90°
30°
150°
90°
For 7.1 high definition systems
(no international standards)
r
2
r
1
t
del
= 30 µs (r
2
-r
1
)
ref
r
diff
Symmetrical loudspeaker and object placement in the
room improves stereo imaging, d
1
, d
2
, d
3
Keep back wall distance as
long as possible, d
4
d
1
d
1
d
2
d
3
d
4
d
2
d
3
Listening
position
*
Delays:
r
diff
t
del
5 cm (2")
10 cm (4")
20 cm (8")
50 cm (20"
1 m (3') 3 ms
1.5 ms
300 µs
600 µs
150 µs
Small near-field systems:
r
max
= 4 m (12')
r
typical
= 1 - 2 m (3 - 6')
r
min
= 0.75 m (2.5')

Summary

Loudspeaker Placement Angles

ITU-R BS.775-1 Standard Angles

Defines correct loudspeaker angles for optimal sound reproduction based on ITU-R BS.775-1.

7.1 High Definition System Angles

Specific placement angles for 7.1 high definition systems without international standards.

2-Channel Stereo Angles

Recommended ±30° angles for 2-channel stereo configurations.

Loudspeaker Distance and Time Alignment

Consistent Loudspeaker Distance

Ensures all loudspeakers are placed at the same distance from the listening position for balanced sound.

Delay Calibration for Time Alignment

Calibrating delays for closer speakers based on distance difference for precise time alignment.

Loudspeaker Orientation and Positioning

Acoustical Axis Reference Point

Using the acoustical axis as the primary reference point for loudspeaker orientation.

Cabinet Orientation Guidelines

Recommended and not recommended cabinet orientations for optimal listening areas.

Vertical Plane Aiming and Obstructions

Pointing loudspeakers at the listening position in the vertical plane and avoiding obstructions.

Room Acoustics and Loudspeaker Integration

Optimal Distance from Walls

Guidelines for loudspeaker placement distance from walls to manage bass response and room modes.

Acoustical Controls and Room Effects

Adjusting for room acoustics like walls, corners, reflections, and free-standing placement effects.

Managing Midrange Reflections

Strategies to avoid reflections for a smoother and clearer midrange frequency response.

Neumann KH 420 Specifications

General

Acoustical operating principle	Closed
Drivers	10" woofer, 3" midrange, 1" tweeter
Crossover Frequencies	570 Hz, 2.0 kHz
Input Connectors	XLR
Weight	35 kg
Input Impedance	10 kOhm
Frequency Response	26 Hz - 22 kHz (-3 dB)