Neumann KH 420 User manual
04/14 – 554622GEORG NEUMANN GMBH · LEIPZIGER STR. 112 · 10117 BERLIN · GERMANY
TEL +49 (0)30 / 41 77 24 -0 · FAX -50 · HEADOFFICE@NEUMANN.COM · WWW.NEUMANN.COM
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)
r2
r1
tdel = 30 µs (r2-r
1)
ref
rdiff
Symmetrical loudspeaker and object placement in the
room improves stereo imaging, d1, d2
, d
3
Keep back wall distance as
long as possible, d4
d1d1
d2
d3
d4
d2
d3
Listening
position
*
Delays:
rdiff tdel
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:
rmax = 4 m (12')
rtypical = 1 - 2 m (3 - 6')
rmin = 0.75 m (2.5')
Getting Started Quickly
Free standing
In a corner
Acoustical controls
Against a wall Bass = -5 dB
Bass = -2.5 dB
Bass = -7.5 dB
Solid:
Soft:
ReflectionsMid = -1.5 or -3 dB
Treble = -1 dB
Bass = -2.5 dB
All 0 dB
Live:
Dead:
Flush mounting
Wall should be heavy: bricks, concrete,
or multiple layers of gypsum or MDF
Use Remote Electronics Kits to remotely
locate the electronics panels
Mechanically isolate the cabinets from
the structure using vibration isolators
Not recommended cabinet
orientation
Recommended cabinet
orientation for a wide
usable listening area
Acoustical axis and cabinet orientation
Use acoustical axis
as a reference point
Distance from the wall
fn
Full Range Loudspeakers
Bass Managed Loudspeakers
Avoid dwall = 0.8 – 2.0 m
Avoid dwall = 0.8 – 1.0 m
Subwoofers Avoid dwall = >0.8 m
dwall
dwall
x cm
y cm
Avoid reflections for a smooth midrange
Vertical plane: Point the loudspeakers at the listening position.
Avoid objects between the loudspeaker and listening position.
