Schoeps DSP-4 KFM 360 User manual

DSP-4 KFM 360
Digital Microphone Processor for Surround System
with KFM 360 Sphere Microphone
Operating Instructions

2
Contents
page
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Quick start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Control layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
AC powering and safety fuse . . . . . . . . . . . . . . . . . . . . . . 12
Connecting the microphones . . . . . . . . . . . . . . . . . . . . . . 13
Connecting the outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Setting directional patterns . . . . . . . . . . . . . . . . . . . . . . . 14
Processing the front channels . . . . . . . . . . . . . . . . . . . . . 15
FRONT PANORAMA
L/R BALANCE
Processing the rear channels . . . . . . . . . . . . . . . . . . . . . . 15
F/REAR BALANCE
REAR DELAY/ms
REAR SLOPE/ms
The low-frequency channel . . . . . . . . . . . . . . . . . . . . . . . 15
Monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Storing and loading presets . . . . . . . . . . . . . . . . . . . . . . . 16
Synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Important notices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Subject to change without notice.
Not responsible for errors or omissions
Printed in Germany 040908, © by Schalltechnik Dr.-Ing. Schoeps GmbH
Schoeps GmbH
Spitalstraße 20
D-76227 Karlsruhe
Germany
Tel.: [phone]
Fax: [phone]
E-mail: [email protected]
Web site: www.schoeps.de

3
Overview
Overview
The DSP-4 KFM 360 is a 24-bit processor
unit. Together with the sphere microphone
KFM 360 and two bidirectional compact
condenser microphones CCM 8L, it forms a
compact 5.1 surround recording system
with excellent spatial imaging capability.
The processor derives the six 5.1 surround
channels from only four microphone signals
(the two pressure transducers in the KFM
360 plus two figure-8s) and offers a wide
range of selectable settings.
KFM 360:
– for 12 or 48 Volt phantom powering
– two pressure transducers built into the
sphere
– diameter: 18 cm.
– pickup angle: ca. 120°
CCM 8L:
– for 12 or 48 Volt phantom powering
– to be aimed frontward, toward the sound
source
The primary characteristics of the DSP-4
KFM 360 are:
– analog and digital inputs and outputs
– integrated 48 Volt phantom powering and
microphone preamplification
– built-in equalization for the microphones
– digital processing can be performed during
or after the actual recording
– analog control “feel”
– capability to store control “presets”
– directionality of the front and rear channel
microphones is independently selectable
– the stereo basis width of the front chan-
nels is independently variable
– adjustable time delay and low-pass filtering
for the rear channels
– sampling rate 44.1, 48 or 96 kHz, 24 bit
In addition to amplifying the microphone sig-
nals, in the “B: SURR” operating mode the
DSP-4 KFM 360 provides compensation for
the low-frequency response of the figure-8
microphones and appropriate diffuse-field
equalization for the pressure transducers.
The front-channel outputs result from sum-
ming the outputs of the pressure transduc-
ers with the outputs of the figure-8s, while
the rear-channel outputs result from sub-
tracting these signals (see drawing on next
page). The resulting “virtual microphones”
face frontward and backward as do the
actual figure-8s. The directional patterns of
the front- and rear-facing “virtual micro-
phones” may be set independently, from
omnidirectional through cardioid all the way
to figure-8 (though the extreme settings are
of only limited usefulness). This permits flexi-
ble adaptation to the particular acoustic
conditions of the recording venue, since the
choice of directional pattern affects the
amount of reverberant energy that will be
KFM 360 with two figure-8s (CCM 8L)

4
Overview
picked up.
If the unprocessed microphone signals are
recorded (four channels), the effective direc-
tional settings can be chosen retroactively
during post-production playback.
The center channel signal is derived from
the front channels by a matrix. An additional
channel contains only a low-frequency signal
up to 80 Hz, which is obtained by summing
the pressure transducer outputs and reduc-
ing the total level by 6 dB.
To prevent the disturbing effect of rear-chan-
nel localization of sound sources, the rear
channel signals can be reduced in level,
delayed and/or processed by an adjustable
low-pass filter.
In addition to these primary functions, each
selector switch also has a secondary func-
tion that allows, for example, the relative
front-to-back channel gain or the left/right
balance to be adjusted. While recording
there is also a monitoring function which
permits twelve different signals to be heard
through Output III, as determined by the set-
ting of the REC MONITOR knob.
Suggestions concerning microphone
placement
The KFM 360’s microphones pick up both
level and arrival-time differences between
the left and right channels. However, the
diameter of the KFM 360 has been made
smaller than that of the sphere stereo micro-
phone KFM 6 in order to increase the stereo
pickup angle. This is because a surround
microphone will often be placed closer to
the sound source than a microphone might
be for conventional stereo pickup. The rear-
channel loudspeakers will reproduce com-
ponents of the diffuse sound field, thus giv-
ing an impression of the hall’s spatial char-
acter. This reduces the difficulty of finding a
microphone position that will provide both a
clear stereophonic image and also a good
balance of direct and reverberant sound.
+
−
+
−
+
−
+
−
front channels:
sum (omni + figure-8)
rear channels:
difference (omni - figure-8)
right front
(R)
right surround
(RS)
omni omni figure-8
CCM 8
figure-8
CCM 8
Derivation of right front (R) and right surround signals (RS)
as proposed by Bruck (rough diagram)
KFM 360

Block Diagram
5
Signal processing flow in the DSP-4 KFM 360 (MODE B: SURR.) (In the “REC” mode the equalization for omni and figure-8 is not active.)

6
Quick Start
Recording for Post-Production
Simply connect the microphones to a digi-
tal four-channel recording device that offers
48V phantom power and the needed gain.
The signals of the KFM 360's omnis must
be connected to input I and the figure-8s to
input II (see bottom of this column; channel I
= left side = yellow mark on the SCHOEPS
Y-cable). This way each pair will correspond
to one AES/EBU signal.
For post-processing, the two AES/EBU
signals should be connected to the digital
inputs I (omni) and II (figure-8):
You can use the DSP-4 KFM 360 as a
microphone preamplifier and/or A/D
converter
You can use the DSP processor as a
microphone preamplifier together with its
A/D converter.
KFM
360
left,
yellow mark
1324
right,
red mark
channels
front
A red dot
indicates
the front of
the figure-8
red mark
Setting up and connecting the KFM 360 and CCM 8Ls
Note:
When the KFM 360 is suspended (e.g. from the ceil-
ing), left and right are reversed.
How to connect the KFM 360 and the CCM 8Ls to the
processor
A red marking
on one screw
indicates the
right side of
the KFM 360
Before powering on the unit for the first
time, please make certain that the volt-
age selector is set correctly for your
area. The voltage selector is on the rear
panel beneath the on/off switch; see
photos and instructions on page 12.
Y-cable
Lemo
XLR-5-
or minia-
ture con-
nector
For alternative hookup
arrangements see
page 13, column 1.

7
Quick Start
While F/REAR BALANCE and L/R BAL-
ANCE usually should be in the “0” position,
the OVERALL GAIN knob controls the basic
volume. It can be adusted when the fifth
selector switch is turned so that only one
LED in its surrounding circle lights up. The
OVERALL GAIN serves to control mastering
devices.
With the func-
tion control in
the lower posi-
tion (orange
mode =
“GAIN/dB
MODE”)...
...this control
must be set to
“A” (only one
LED will be lit).
For processing
the signals this
control must be
set to “B”,
which is the
case when any
pair of LEDs
lights up.
Signals at the analog outputs (XLR-5):
Signals at the digital outputs:
left
1324
right
channels
left
1324
right
channels
yellow / red
end of SCHOEPS Y-adapter cable
end of SCHOEPS Y-adapter cable:
yellow / red
Processing and Recording simultane-
ously
If processing is to be done while recording,
connect the microphones as shown on
page 6. Then set the function control to the
GAIN/dB mode (see illustration in column 1
on this page). Finally, turn the REAR
SLOPE/Hz / MODE knob until a pair of
LEDs in its surrounding circle lights up.

Quick Start
+ phase color
channel pins at pin marking*
Output I: left front 2, 3 2 yellow
right front 4, 5 4 red
Output II: center 2, 3 2 yellow
LFE 4, 5 4 red
Output III: left surround 2, 3 2 yellow
right surround 4, 5 4 red
* with SCHOEPS Y-cable AKSU/2U (XLR-5 to 2x XLR-3)
Processed analog outputs:
Processed digital outputs:
channel
Output I: left front
right front
Output II: center
LFE
Output III: left surround
right surround
Note:
The position of the function control deter-
mines whether you are using the function
settings of the first (green) layer or the sec-
ond (red) layer. Only the settings in the cur-
rently selected layer will be changed.
The center channel is not active when the
“FRONT PANORAMA” is in the lowest posi-
tion (function control in “PATTERN SURR.”
position = green mode).
For lowest noise, the “Analogue Mic Gain”
switch on the rear side should be in the
upper position (+20 dB). The “+10 dB” posi-
tion is reserved for exceptionally high levels.
The indicated polar patterns are nominal
settings which will be precisely valid only if
the gains of all the record/playback channels
are carefully matched.
8

Quick Start
9

LEVEL/dB
REAR SLOPE/Hz
REAR DELAY/ms
OVERALL GAIN
F/REAR
BALANCE
L/R
BALANCE
-24 -12 -3
DOWN UP
PRESET
STORE
DSP-4 KFM 360
FRONT PANORAMA
FRONT REAR
PATTERN
SURR.
GAIN/dB
MODE
REC
MONITOR
MODE: A: REC B: SURR
7
9
11
1
3
4
2
6
5
1
7
5
11
39
0
1k
1k6
2k5 4k
6k3
10k
A
A
A
AA
A
B
BB
B
BB
5
15
35
45
55
25 18
30
0
6
12 24
8
10
12
-3
+3
+1
+5
-5
-1
0
-3+3
+1
+5
-5
-1
GAIN/dB
MODE
PATTERN
SURR.
8
8
Control layout
Front panel
Selector switch 1:
polar pattern front
microphones
Balance front/rear
Selector switch 3:
polar pattern rear
microphones
Monitor output
selector
Selector switch 2:
Front stereo width
pos. 12: Center off
Balance left/right Number
of the
current
preset
Function
control
(determines the
set of func-
tions of the
five selector
switches)
Pushbuttons
for selecting
a preset
Pushbutton for stor-
ing the current set-
tings as the current
preset
Selector switch 4:
delay of the rear
channels
Overall gain control
Indicators for internal
digital signal levels
Selector switch 5:
Turnover frequency for
rear-channel low-pass
filter
A: Raw microphone
signals (for post-pro-
duction processing)
B: Processing of micro-
phone signals
enabled
off off
0 dB
0ms Hz
(low-pass off)
Center
off
0 dB
GAIN/dB
MODE
PATTERN
SURR.
In the recording mode
(MODE A of selector
switch 5) this is the only
control that is in effect.
controls which are active in
the recording mode (MODE A
of selector switch 5)
controls which are active in
the surround mode (MODE B
of selector switch 5)
10

11
Control layout
Power on/off switch
Power cord
socket
Safety fuse /
AC voltage selector
Analog microphone inputs
with 48 V phantom powering
(muted if digital master and
slave inputs are connected)
Input I:
channel 1: left omni
channel 2: right omni
Input II:
channel 1: left figure-8
channel 2: right figure-8
Digital
outputs
Gain selector
for analog
inputs
Sampling rate
selector (internal
clock for A/D con-
verters)
Master*
(AES/EBU)
for synchro-
nizing the
internal A/D
converters
Slave
(AES/EBU)
switches over
to the digital
inputs
Analog
outputs:
SURR mode (B): REC mode (A):
Output I:
channel 1: left front left omni
channel 2: right front right omni
Output II:
channel 1: center left figure-8
channel 2: bass (LFE) right figure-8
Output III:
channel 1: left surround left monitor
channel 2: right surround right monitor
Rear panel
Digital inputs
(recorder playback)
Channel assignment just as with the analog in/outputs
*The reason for having the master clock func-
tion and the slave input on two separate
sockets is that this allows the converters to
be slaved to an external source while the ana-
log inputs are being used (see example on
page 17).

AC Power Cord Socket
AC power cord socket / Power on/off
switch
AC power is connected to the back of the
DSP-4P. A single module contains the
on/off switch, the power cord socket and
the main safety fuse holder. The processor
can be powered by 230 VAC or 110 VAC.
The normal factory setting of 230 VAC can
be recognized from the fact that the "220 -
240 V" label is in the upright position, and
that the arrowhead adjacent to it is the
one pointing toward the small, white solid
rectangle on the lower border below the
fuse compartment. The voltage setting
must be correct for the AC (mains) voltage
in your region of operation.
The AC voltage setting / Changing the
fuse
The fuse compartment on the back of the
DSP-4P provides the means for setting the
power supply voltage:
To change the setting, unplug the AC
power cord from the socket and insert the
tip of a flat-blade screwdriver into the slot at
the lower edge of the power cord socket
(see photo above on the right side).
Carefully pull the fuse compartment out. To
facilitate changing the fuse, unfold the small
tabs that are on either side of the fuse holder:
When the proper value fuse has been
inserted, turn the fuse holder so that the
intended voltage label is right-side-up, and
carefully slide the fuse compartment back
into the DSP-4P.
Please note:
Both a 100 mA and a 200 mA fuse are
supplied, each in the corresponding position
of the compartment.
The fuse rating for 230-Volt operation must
be 100 mA, and for 110-Volt operation, 200
mA (slow blow in both cases); fuse size is 5
x 20 mm or 6 x 30 mm. It is important for
the fuse to be a 230-Volt type even if the
actual AC voltage to be used is much lower.
Also, when changing the unit from 110- to
230-Volt operation it is important to install
the lower-rated (100 mA) fuse. A 200 mA
fuse at 230 Volts would not provide ade-
quate protection; operating the unit in this
manner is potentially unsafe and will void the
unit's warranty.
Under no circumstances should any
other type of value of fuse be used other
than the types and values given above.
If fuses burn out continually, send the unit
to the factory, dealer or representative for
repair.
slit
230V setting
= factory setting
110V setting
12

Setting up the Microphones / Level Setting
Connecting the microphones
Analog inputs
Input I: XLR-5; the KFM 360 is connected
here.
Input II: XLR-5; The two figure-8s are con-
nected here. The following combinations of
connecting cables can be used:
– 2 adapter cables of type K 5 LU (as
included with the CCM 8 Lg) plus one Y-
adapter AK 2U/SU (2x XLR-3 to XLR-5)
– 1 Y-adapter KLY 250/0 SU, which goes
from two Lemo connectors on the micro-
phone ends of the cable (250 mm long
each) and terminates in an XLR-5M cable
10 cm long; XLR-5 cables can be used as
extensions.
– 1 Y-adapter KLY 250/5SU (as above, but
with a 5-meter XLR-5M output cable)
– 1 Y-adapter KLY 250/0 I (as KLY 250/0 SU,
but with a miniature output connector
instead of an XLR-5M). Adapter cable
KS 5 IU is also available, which goes from
this type of miniature output connector to
an XLR-5M.
Both ends of the right-channel cable (II) are
marked in red on all Y-adapters.
Note: The analogue inputs are exclusively
intended for connecting condenser micro-
phones. Hence the 48 V phantom powering
is permanently enabled.
If, however, a device is connected here with-
out any decoupling, this can lead to a seri-
ous damage of its outputs.
Digital inputs:
These inputs are designed for connecting
a four-channel recorder with AES/EBU out-
puts. The raw (unequalized) microphone sig-
nals can thus be processed after the record-
ing. Each input should receive the signals
from one pair of the microphones. Channel
assignments match those of the analog
inputs: Input pair I = KFM 360; input pair II =
the two figure-8s.
A four-channel recorder will use both the
master and the slave input sockets. The
processor will thus receive word clock from
the external recorder, and the fact that a
connection has been made to the slave
input will switch the unit from its analog to
its digital signal inputs for audio signals.
If a two-channel digital recorder is con-
nected to the master input, an additional
connection to the slave input will be needed
in order to cause the processor to switch
over to its digital audio inputs. This is impor-
tant when deriving a center-channel signal
from a two-channel KFM 360 recording or
when the processor is being used as a two-
channel D/A converter.
Setting the analog signal levels
The "Analogue Mic Gain" switch on the left
side of the rear panel sets the input gain for
all four analog inputs. "+20 dB" is the nor-
mal setting for 10 mV/Pa condenser micro-
phones. Only for sound pressure levels
above 120 dB (with microphones of approx-
imately that sensitivity), or when a recorder's
line-level analog outputs are connected for
post-processing, should the "+10 dB" gain
setting be used.
Setting the level of input signals prior to
processing
The level of input signals-including digital
signals-can be adjusted in 3 dB steps prior
to any other processing within the DSP-4
KFM 360. Up to 33 dB of gain may be
applied at this stage. The gain is set by
using the “REAR DELAY/ms”, “OVERALL
GAIN” control in its secondary function (set
by the function control switch which has got
to be in the “GAIN/dB MODE” position).
Note: The higher the gain, the smaller is
the dynamic range (headroom).
13

14
Outputs / Settings
Settings:
Setting the directional pattern:
(FRONT, REAR)
To make this setting, the function switch
must be in the upward position ("Pattern,
SURR.").
The directional patterns of the front-chan-
nel microphones can be set with rotary
selector switch 1 ("FRONT") in the upper
row, and the patterns of the rear-channel
microphones can be set with rotary selector
switch 3 ("REAR"). The selected directional
pattern is shown by LEDs that surround
each rotary switch. For example:
Note: If the knob for the front channels is
turned until the LED directly underneath it
lights up, these channels will be turned off.
If, however, the corresponding knob for
the rear channels is put into this position,
their characteristic will be identical with
those of the front channels.
Level indicators
The "Level" LEDs indicate the digital signal
levels within the DSP-4P. At any given
moment they display the highest level
occurring anywhere within the signal-pro-
cessing system.
The -3 dB LED should light only during the
highest peak inputs, i.e. only very rarely.
Otherwise, in an extreme case digital clipping
could occur, which might become audible.
Connecting the Outputs
MODE: A: REC
The signals at outputs I and II are un-
processed, i.e. without frequency response
compensation. This operating mode leaves
output III free for use as a monitor output. In
mode "B: SURR" output III will carry the rear
channel signals, so it may be necessary to
reroute these signals to the front or main
loudspeakers. See following page for further
details concerning the monitoring function.
MODE: B: SURR
Processed signals are present at the out-
puts as follows:
Output I: channel I: L (front left)
channel II: R (front right)
Output II: channel I: Center
channel II: Bass (LFE)
Output III: channel I: LS (rear left)
channel II: RS (rear right)
selector switch 1 in “cardioid” position
selector switch 1 in position between omni
and wide cardioid

15
Settings / Monitor
Additional processing for the rear chan-
nels:
F/REAR BALANCE, REAR DELAY/ms
REAR SLOPE/Hz
To avoid hearing the rear loudspeakers--or
more precisely, to avoid localizing sound
sources in them in a distracting manner--
there are three independent settings which
can be used in any desired combination:
1. Lowering the rear channel level relative
to the front channels (F/REAR BALANCE);
2. Delaying the rear channels relative to
the front channels by up to 55 ms (REAR
DELAY/ms)--in the bottom-center setting,
the delay is 0.
3. Rolling off the high-frequency response
of the rear channels (REAR SLOPE/Hz) at a
12 dB/octave slope--in the bottom center
setting, no high-frequency rolloff is applied
Please note: Although adjustable delay
is a feature normally included only in more
ambitious digital mixing desks, the DSP-4
KFM 360 processor offers such a function.
However, the amount of the delay should
not be changed while the unit is recording
in Surround mode, because such a
change may produce audible side effects.
Additional Low-Frequency Channel
The LFE ("low frequency enhancement")
channel contains the blended, low-pass-fil-
tered information from the two pressure
transducers of the KFM 360 ((L + R)/2). It
does not correspond in function to the LFE
channel of a cinema surround sound system
[i.e. special effects such as earthquakes].
The -3 dB point of the low-pass filter is
80 Hz. It is critically damped with a fourth-
order rolloff (24 dB/octave).
Monitor function REC MONITOR
In recording mode "MODE: A: REC" the
input signals are passed through and are
presented unchanged (apart from the possi-
ble A/D and D/A conversions) at outputs I
and II. Output III in this mode is used for
The Center Channel
The center channel is formed by matrixing
the front-channel signals. It can be turned
off by setting the "FRONT PANORAMA"
selector switch to its lowest position.
However, it will then no longer be possible
to adjust the stereo soundstage width.
Additional processing for the front
channels:
The center channel and the "FRONT
PANORAMA" setting
The center channel is formed by matrixing
the front-channel signals and thus contains
their correlated signal components (those
common to the two channels). The use of
this channel makes it necessary to decorre-
late the front left and right loudspeaker sig-
nals in order to keep the stereo image from
becoming weighted too heavily toward the
center. The degree of decorrelation is con-
trolled by the "FRONT PANORAMA" knob. If
this knob is set to the bottom position, the
center channel signal is not produced, the
matrix is turned off and the decorrelation cir-
cuitry will have no further effect on the L and
R signals.
The "L/R BALANCE" control has the same
function as in a conventional stereo system,
except that its bottom-center setting has the
same effect as the top-center setting: the
balance of the two channels is not altered.

Monitor / Presets
monitoring. Selector switch 3 allows the fol-
lowing options to be chosen:
1. KFM 360 with frequency response cor-
rection applied
2. Figure 8s with frequency response cor-
rection applied
3. L and R (FRONT PANORAMA not used;
no center channel signal available)
4. L and R (FRONT PANORAMA active)
5. Center channel
6. LS and RS without low-pass filter
7. LS and RS with low-pass filter
The next two monitor settings allow the
effect of the delay to be monitored:
8. LS channels with low-pass filter: left
channel with delay / right channel with-
out delay
9. SR channels with low-pass filter: left
channel with delay / right channel with-
out delay
10. KFM 360 with no frequency response
correction applied
11. Figure 8s with no frequency response
correction applied
12. Additional Low-Frequency Channel (LFE)
Buttons and display for preset functions
Storing and Recalling Presets
Certain groups of settings will probably
reveal themselves as your favorite ways of
using the DSP-4P. To set these up rapidly,
the unit is capable of memorizing ten groups
of settings and of calling them up instanta-
neously as "presets" 0 through 9.
Please note: The groups of stored set-
tings include the position of the five main
knobs in their primary functions, all of which
are controlled in the “green mode”: FRONT
pattern, FRONT PANORAMA, REAR pat-
tern, REAR DELAY and REAR SLOPE/Hz.
The settings of the secondary functions are
not stored.
Storing presets:
The numeric display will always show the
number of the most recently recalled or
stored preset. The current settings will be
stored as that number of preset whenever
the "Store" button is pressed. If a group of
settings has been associated with a given
preset number, a small red point will light up
within the display alongside the numeral.
If you intend to store a group of settings
as a certain preset number, press the
“store” button and keep it pressed while
using the up and down buttons to find the
desired number. If then you release the
"store" button, the settings will be stored as
the indicated preset. To store a group of
settings as the preset number which is
already being displayed, merely press and
release the “store” button.
Recalling presets
Stored presets are recalled simply by
pressing the "Up" and "Down" buttons until
the desired preset number appears. The
current knob settings are replaced immedi-
ately by the stored settings of the indicated
preset number.
16

17
Synchronization
KFM
360
Polarflex
DSP no. I is the master of DSP II and the digital recorder:
DSP I DSP II
KFM
360
Polarflex
The digital recorder is the master of DSPs I and II:
DSP I DSP II
digital recorder inputs digital outputs
digital inputs digital recorder
digital outputs
left
left
right
left
right
left right
right
Master
Master
How to synchronize two DSP-4 KFM
360 or a DSP-4 KFM 360 + DSP-4P
PolarFlex processor with one recorder
If it should be necessary to synchronize two
DSP-4 processors, connect the units as
shown here:
Please: If settings are called up and then
changed by turning one or more of the
knobs, these changes will be lost if the user
presses the "Up" or "Down" button without
first storing the new settings as a preset.

Technical Specifications
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Specifications:
Analog inputs (2 pairs, with 48 Volt phantom pow-
ering)
“Analogue Mic Gain”:“+10 dB” “+20 dB”
Gain: +10 dB +20 dB
Maximum input level: -5 dBU -15 dBU
Maximum sound pressure level with CCM 2 S (omni-
directional) : 130 dB SPL 120 dB SPL
Analog outputs (3 pairs, balanced):
2 pairs of pass-through outputs, one pair of
processed signal outputs
Maximum analog output level: +4.5 dBU
Digital inputs (2 pairs):
Data format: AES/EBU
Digital outputs (3 pairs):
2 pairs of pass-through outputs, one pair of
processed signal outputs
Data format: AES/EBU
Synchronization/clock frequency:
with internal synchronization: 44,1/48/96 kHz
with external synchronization (via master inputs):
25 - 100 kHz
Maximum digital gain: 33 dB
Dynamic range:
A/D converter: 98 dB (peak)/CCIR
110 dB (RMS)/A-weighted
(108 dB (RMS)/unweighted)
D/A converter: 100 dB (peak)/CCIR
113 dB (RMS)/A-weighted
(110 dB (RMS)/unweighted)
Characteristic impedance of the cables which are
connected to the digital outputs: 110 Ohm
AC mains voltage: switchable 110-120 V / 220-240 V
Power consumption: 15 VA
Fuse: 230 V: 100 mAT; 110 V: 200 mAT
Dimensions (W×H×D): 220 ×90 ×246 mm
(8,66 ×3,54 × 9,69 ”)
Weight: 2.7 kg (6 lbs)
Modes of operation
Since the DSP-4 KFM 360 offers both ana-
log and digital inputs and outputs, several operating modes are possible:
Analog signals from microphones
Digital signals from a recorder
Digital input signals (e.g. from a record-
ing device)
Passed-through input signal (analog and
digital)
Processed signal (analog and digital)
Passed-through input signal (analog and
digital)
Processed signal (analog and digital)
Internal clock: 44.1, 48 or 96 kHz
External clock: via MASTER AES/EBU input (25 - 100 kHz)
The DSP-4KFM 360 will switch over to its digital inputs if a signal is presented at the
"Slave" AES/EBU input socket.
The unit connected to the MASTER AES/EBU socket will determine the clock fre-
quency (25 - 100 kHz).
Input Output

Declaration of Conformity / Warranty
Important
The DSP-4P is designed for indoor use only.
To prevent damage to the unit and shock
hazard to the user, do not allow liquids to
enter the housing.
Do not operate the unit in strong, direct sun-
light because of the risk of overheating. For
the same reason the openings for cooling
must not be covered.
Proper use: We hereby state that the DSP-
4P is for use only in studios, domestic
installations, concert halls, churches etc.; it
is not designed for use in vehicles of any
kind, especially in airplanes, airborne equip-
ment or public transport, nor in hospitals or
in any other setting in which the existing
equipment may be sensitive to electromag-
netic radiation.
Cables: For the digital connections use only
shielded cable with 90% or better shield
coverage in order to prevent undue radiation
of radio-frequency signal energy. All
SCHOEPS cables meet this requirement.
If any such cables should exceed 20 meters
in length, they must have a characteristic
impedance of 110 Ohms and must also be
terminated with 110 Ohms according to the
standard AES 3-1992. This is automatically
the case with the DSP-4 KFM 360.
Declaration of conformity
For the DSP-4P Schalltechnik Dr.-Ing.
SCHOEPS GmbH herewith declare that it
complies with the directive 89/336/EWG on
EMC (electromagnetic compatibility) of the
EC council.
This product is not subject to further direc-
tives.
For the judgement of this product in
respect of EMC the following standards are
applicable:
EN 55103–1, EN 55103–2
The manufacturer accepts full responsibility
for this declaration.
Warranty
We guarantee our products for a period of
twenty-four months, except for cables, bat-
teries and cells (including rechargeable bat-
teries and cells) and any other products of
other manufacturers for which SCHOEPS is
only the reseller; for these products the peri-
od of guarantee is six months. The guaran-
tee period begins on the date of purchase.
Please provide your bill of sale in all cases
as proof of guarantee; without it, repairs will
be undertaken only at the owner’s expense.
We reserve the right to satisfy all warranty
requirements regarding defects of workman-
ship or materials by means of repair or par-
tial or complete replacement of the unit, at
our sole discretion.
Excluded from this guarantee are defects
due to misuse (e.g. incorrect operation;
mechanical damage), abuse or “acts of God.”
This guarantee is nullified in the event of
tampering by unauthorized persons or agen-
cies.
To secure your rights under this guarantee,
send the unit with all included accessories
and proof of purchase, at your expense,
either to SCHOEPS (if you are a customer in
Germany), or to our representative (if you are
a customer outside of Germany).
In exceptional cases you can, by prior
arrangement with SCHOEPS, send a unit
directly to us from a foreign country. But
since any return shipment to a foreign cus-
tomer must be prepaid, this would be slow-
er especially when the conditions for service
under guarantee are not met; all payment
must then be carried out before the repaired
item could be returned to the customer.
This guarantee does not affect any contrac-
tual agreements which may exist between the
buyer and seller of the equipment.
This guarantee is world-wide.
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070509