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| KH 805
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:
X
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
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on the rear of the subwoofer
(see warning note on page 7) 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 24) .
Using one or several subwoofers
X
Use . . .
one subwoofer
several subwoofers
. . . if your room does not offer sufficient
space for several subwoofers .
. . . if you need to move left and right
along the mixing console, or if there are
several listening positions along a large
format mixing console .
. . . 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 out-
put 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 .