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TWEETER HI Cut-off frequency: 1500, 2500, 3500, 5000, 7000 Hz.
Level control: +6 ÷ -12 dB
Phase inversion: 0°/180°
MIDRANGE HI cut-off frequency: 300, 400, 600, 900, 1200 Hz.
LO cut-off frequency: 1500, 2500, 3500, 5000, 7000 Hz.
Level control: +6 ÷ -12 dB
Phase inversion: 0°/180°
WOOFER HI cut-off frequency: 50, 60, 80, 100, 120 Hz.
LO cut-off frequency: 300, 400, 600, 900, 1200 Hz.
Level control: +6 ÷ -12 dB
SUB LO Cut-off frequency: 50, 60, 80, 100, 120 Hz.
Level control: +6 ÷ -12 dB
Boost level, 45 Hz: 0 ÷ +6 dB
Phase inversion: 0°/180°
Stereo/Mono: selectable.
HI-REAR HI Cut-off frequency: it depends on HI Woofer section setting.
Level control: not available.
SXR4 – TECHNICAL FEATURES
4 way electronic crossover with variable gain outputs for subwoofer, woofer, midrange and tweeter. 18dB/Oct. Bessel
filters. “Ambient” function, to adjust and control staging. Narrow band boost filter set at 45 Hz, with variable gain.
Automatic muting when the device is switched on and off. Inputs for remote and external muting. 24 Ct. gold-plated
RCA sockets.
External power supply 10 ÷ 15 VDC
Internal power supply 30 VDC
Bandwidth 5 Hz ÷ 200 kHz
S/N ratio > 100 dB
Stereo separation > 70 dB (10 kHz)
Distortion 0.004%
Max. input level 4 VRMS
Max. output level 4 VRMS
Input impedance 15 kOhms
Output impedance 1 kOhm
MUTE-REMOTE input 3 ÷ 15 VDC
Size (W x H x D) 285 x 40 x 120 mm
OWNER’S MANUAL
SXR4
4 way electronic crossover
- 62018 Potenza Picena (MC) - Italy - Tel. +39 0733 870.870 - Fax +39 0733 870.880 www.audison.com
FRONT
LRLRLRLRLR
REARSUB
WOOFER
506080
100
120
1200
900
600
400
300
MIDRANGE
TWEETER
7000
5000
3500
2500
1500
Pre OutMuteRemote
Battery
Wf Wf
Midrange
Midrange
Twe ete r
TwTw
Twe ete r
To another
amplifier
HI-REAR
506080
100
120
SUB
506080
100
120
LRLR LRLR
Woofer
Woofer
Tweeter
Amp
Midrange
Amp
Woofer
Amp
Rear
Amp
Sub
Amp
HAND-FREE PHONE
IN-OUT PANEL
CONNECTIONS DIAGRAM
Cod. 10124040
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IN-OUT PANEL - FUNCTIONS
DESCRIPTION
SXR4 is a 4 way electronic crossover designed to handle a Woofer + Midrange + Tweeter + Sub system. It has an input
(IN) for the signal coming from the source and six outputs; four of them are main outputs, two are secondary. The first of
the four main outputs (SUB) provides a subwoofer Lo-Pass signal; the second (WOOFER) supplies a woofer Band-Pass
signal; the third (MIDRANGE) insures a Band-Pass signal for the midrange; the fourth (TWEETER) gives a Hi-Pass signal
suitable to drive a tweeter.
The HI-REAR output (one of the two secondary ones) has to be used for the realisation of a Rear system to be filtered
by passive crossover; it provides a unitary gain Hi-Pass signal taken from the woofer section Hi-Pass filter (WOOFER
HI); Hi-Pass signal has the same cut-off frequency as Woofer section itself. The BYPASS output permits to send the full
range signal in the input to another amplifier installed after the crossover.
SXR4 controls panel is divided in six sections: TWEETER, MIDRANGE, WOOFER, SUB, BOOST and AMBIENT.
TWEETER, MIDRANGE, WOOFER and SUB sections have five step switches for five cut-off frequencies (TW: HI;
MID: LO-HI; WOOFER: LO-HI; SUB: LO) and a level control. TWEETER, MIDRANGE and SUB sections also have a
switch for signal phase inversion between 0° and 180° (PHASE), that allows to align subwoofer, midrange, tweeter and
woofer. SUB section has a switch to choose functioning mode (MONO/STEREO).
BOOST section widens and increases subwoofer frequency response. It consists of a boost filter with adjustable gain,
whose frequency is set at 45 Hz (LEVEL 45 Hz).
Acting on the sum and the difference between the two stereo channels, AMBIENT section widens sound image. It has an
adjustable level control (LEVEL) and an ON/OFF switch.
FILTERS TYPOLOGY
SXR4 filters have Bessel configuration with low group delay, which insures the speakers correct acoustic alignment.
Filters slope is 18dB/Oct.; it provides speakers with safer and more linear functioning than cuts with lower slope can do
and limits the overlap of their working areas. Cut-off frequency can be chosen among five pre-set values for SUB,
WOOFER HI, WOOFER LO, MIDRANGE HI, MIDRANGE LO and TWEETER HI; this makes SXR4 suitable to every
speakers system avoiding problems created by linear adjustment. Since the latter occurs through potentiometers, it is
inaccurate both for frequencies value and for filters correct functioning. The use of very low tolerance components (1%
resistors and capacitors) insures precise and constant filters performances.
PRECAUTIONS
SXR4 crossover must be installed only in vehicles with 12VDC power supply voltage with negative to
ground.
It is important NOT TO USE any other kinds of electric power supply in order to avoid fires or possible
electrocutions.
Avoid to install the device where temperature is below 0°C or above 55°C and in case of extreme humidity (<10% or
>90%).
Avoid to install it in dusty places or in contact with liquids.
INSTALLATION
This crossover must be fixed through the four screws and spacers given with it. In order to get the best installation, we
recommend the use of audison cable products, that can satisfy all needs.
CONTROLS PANEL – FUNCTIONS
1500
2500
3500
5000
7000
HI
-Hz-
1500
2500
3500
5000
7000
LO
-Hz-
300
400
600
900
1200
LO
-Hz-
50
60
80
100
120
HI
-Hz-
WOOFER-LEVEL
300
400
600
900
1200
HI
-Hz-
MID-LEVEL
50
60
80
100
120
LO
-Hz-
SUB-LEVEL
LEVEL
MONO
STEREO
ON
OFF
ON
TWEETER
MIDRANGE
WOOFER
SUB
AMBIENT
BOOST
LEVEL
45 Hz
SXR4
PHASE
ϕ
0
PHASE
ϕ
0
PHASE
ϕ
0
TW-LEVEL
1
5
9
11
15
10
13
12
14
16
17
18
4
2
7
6
8
3
SXR4
1
2
POWER
REM
MUT
3
4
5
6
7
8
9
10
TWEETER
MIDRANGEWOOFER
HI-REAR
SUB
IN
BY-PASS
L
R
1. HI: It adjusts Tweeter section cut-off frequency.
2. TW-LEVEL: It adjusts Tweeter section output level.
3. PHASE: It permits to invert the phase of the signal in the TWEETER output between 0° (0) and 180° (-ψ).
4. LO: It adjusts the midrange Lo-Pass filter cut-off frequency.
5. HI: It adjusts the midrange Hi-Pass filter cut-off frequency.
6. MID-LEVEL: It adjusts the output level of the MIDRANGE section that drives the midrange.
7. PHASE: It permits to invert the phase of the signal in the MIDRANGE output between 0° (0) and 180° (-ψ).
8. LO: It adjusts the woofer Lo-Pass filter cut-off frequency.
9. HI: It adjusts the woofer Hi-Pass filter cut-off frequency.
10. WOOFER LEVEL: It adjusts the output level of the WOOFER section that drives the woofer.
11. LO: It adjusts subwoofer cut-off frequency.
12. SUB LEVEL: It adjusts the output level of the SUB section that drives the subwoofer.
13. PHASE: It permits to invert the phase of the signal in the SUB output between 0° (0) and 180° (-ψ).
14. MONO/STEREO: It selects subwoofer functioning mode as Mono or Stereo.
15. BOOST LEVEL 45 Hz: It increases the subwoofer response at 45Hz fixed frequency.
16. AMBIENT LEVEL: It adjusts sound image width (staging).
17. AMBIENT ON/OFF: It bypasses AMBIENT LEVEL control.
18. ON (green led): It indicates crossover is on.
1. POWER: Power supply sockets. Connect the positive pole cable (+) and the negative pole cable (-) coming from battery
to them. Respect polarities.
2. REM: Socket to connect the Remote cable coming from source that controls the crossover switching on.
3. MUT: Socket to connect the Mute cable coming from source or from hand-free telephone.
4. BYPASS: Preamplified outputs; they permit to supply another amplifier that is after the crossover with a full range signal.
5. IN: Crossover preamplified inputs. Connect cables coming from source preamplified outputs to them.
6. SUB: Preamplified outputs to connect to subwoofer amplifier. They supply a 18dB/Oct., Lo-Pass filtered signal.
7. HI-REAR: Preamplified outputs to connect to Rear system amplifier. They supply a 18dB/Oct., Hi-Pass filtered
signal.
8. WOOFER: Preamplified outputs to connect to woofer amplifier. They supply a 18dB/Oct., Band-Pass filtered
signal.
9. MIDRANGE: Preamplified outputs to connect to midrange amplifier. They supply a 18dB/Oct., Band-Pass filtered
signal.
10. TWEETER: Preamplified outputs to connect to tweeter amplifier. They supply a 18dB/Oct., Hi-Pass filtered signal.
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