Audison SXR 3 MT Owner's Manual

OWNER’S MANUAL

SXR3MT

18dB/Oct., 3 way electronic crossover

- 62018 Potenza Picena (MC) - Italy - Tel. [phone] - Fax [phone] www.audison.com

FRONT

LRLRLRLR

REARSUB

WOOFER

506080

100

120

1200

900

600

400

300

MID-TW

Battery

Woofer

WooferWf Wf

TwTw

MidTwMid

Tw

REAR

506080

100

120

SUB

506080

100

120

LRLR LR

Pre OutMute

Remote

Mid/Tw

Amp

Woofer

Amp

Rear
Amp

Sub

Amp

To another

amplifier

HAND-FREE PHONE

IN-OUT PANEL

CONNECTIONS DIAGRAM

Cod. 10124030

MID-TW HI Cut-off frequency: 300, 400, 600, 900, 1200 Hz.

Level control: +6 ÷ -12 dB

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.

SXR3MT – TECHNICAL FEATURES

3 way electronic crossover with variable gain outputs for subwoofer, woofer and mid-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) 230 x 40 x 120 mm

DESCRIPTION

SXR3MT is a 3 way electronic crossover designed to handle a woofer + mid-tweeter + sub system. It has an input (IN)

for the signal coming from the source and five outputs; three are main outputs, two are secondary. The first of the three
main outputs (SUB) provides a subwoofer Lo-Pass signal; the second (WOOFER) supplies a woofer Band-Pass signal;
the third (MID-TW) is suitable to drive a midrange + tweeter system filtered by passive crossover.
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 and supplies a unitary gain Hi-Pass signal taken from 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.
SXR3MT controls panel is divided in five sections: MID-TW, WOOFER, SUB, BOOST and AMBIENT.
MID-TW, WOOFER and SUB sections have five step switches for five cut-off frequencies (MID-TW: HI; WOOFER:
LO-HI; SUB: LO) and a level control. MID-TW and SUB sections also have a switch for signal phase inversion between
0° and 180° (PHASE), that allows to align subwoofer with midrange-tweeter and woofer. SUB section has even 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

SXR3MT 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 and MID-TW sections; this makes SXR3MT 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

SXR3MT 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

1. HI: It adjusts mid-tweeter section cut-off frequency.

2. MID-TW LEVEL: It adjusts mid-tweeter section output level.

3. PHASE: It permits to invert the phase of the signal in the MID-TW output between 0° (0) and 180° (ψ).

4. LO: It adjusts the woofer Lo-Pass filter cut-off frequency.

5. HI: It adjusts the woofer Hi-Pass filter cut-off frequency.

6. WOOFER LEVEL: It adjusts the output level of the WOOFER section that drives the woofer.

7. LO: It adjusts the subwoofer cut-off frequency.

8. SUB LEVEL: It adjusts the output level of the SUB section that drives the subwoofer.

9. PHASE: It permits to invert the phase of the signal in the SUB output between 0° (0) and 180° (-ψ).

10. MONO/STEREO: It selects subwoofer functioning mode as Mono or Stereo.

11. BOOST LEVEL 45 Hz: It increases the subwoofer response at 45Hz fixed frequency.

12. AMBIENT LEVEL: It adjusts sound image width (staging).

13. AMBIENT ON/OFF: It bypasses AMBIENT LEVEL control.

14. ON (green led): It indicates crossover is on.

1

5

11

12

14

4

2

6

7

3

8

13

10

9

LO

-Hz-

50
60

80
100
120

HI

-Hz-

WOOFER LEVEL

50
60

80
100
120

LO

-Hz-

SUB LEVEL

LEVEL

MONO
STEREO

ON

OFF

ON

WOOFER

SUB

AMBIENT

BOOST

LEVEL

45 Hz

SXR3MT

PHASE

ϕ

0

300
400
600
900

1200

HI

-Hz-

MID-TW

PHASE

ϕ

0

MID-TW LEVEL

300
400
600
900

1200

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. TWEETER: Preamplified outputs to connect to tweeter amplifier. They supply a 18dB/Oct., Hi-Pass filtered

signal.

1

2

MID-TWEETER

9

8

WOOFER

HI-REAR

7

6

5

4

3

SUB

IN

BY-PASS

L

R

SXR3MT

POWER

REM

MUT

IN-OUT PANEL - FUNCTIONS