Rane MT 4 User Manual

DATA SHEET

MT 4

MULT ICHANN EL

TRANSFORMER

General Description

e MT 4 four-channel distribution transformer is packaged in
a space saving 1U, 19-inch rack-mount tray. e fully isolated,
high-performance toroid transformers provide flat frequency re­sponse within 1 dB from 40 Hz to 20 kHz. Each transformer is
designed for an 8Ω 100 watt input, and 100 watt 70 volt or 100
watt 100 volt output. e recommended load for the 70 volt tap
is 50 Ω. e recommended load for the 100 volt tap is 100 Ω.
Convenient Euroblock connectors are provided on the rear of the
chassis.

e MT 4 comes ready-to-use with four mounted transform­ers and strain-relief Euro connectors. e tray with Euroblock
connectors (model KT 4) and individual transformers with
mounting hardware (model TF 4) are available separately, allow­ing the installer to build a tray with just the number of channels
required. (see the mounting in Figure 4, next page). is makes
this ideal for any rack system where high-performance 100 watt,
100 / 70 volt, isolated distribution transformers are required.

For 25 volt audio distribution systems, the TF 4 can be used
by connecting the 25V loads between its 70V and 100V taps
(green and yellow wires). ermal resistance of the TF 4 is only
1C/W and is lower when mounted in a MT 4 chassis.

Other creative combinations are possible. For example, the
yellow/green pair can drive 8Ω loads near to the amplifier, with
the red/yellow pair being simultaneously used for a 70 V system.
Depending on loading of the 70 V system, this arrangement
presents an impedance between 4 and 8Ω to the amplifier.

MT 4

MULTICHANNEL TRANSFORMER

TF 4 can be used at power ratings much higher than 100 W,
provided that the low-cut frequency is moved up accordingly.
Since voltage capability doubles with each octave, power capabil­ity quadruples each octave. See the RaneNote "Constant-Voltage
Audio Distribution Systems: 25, 70.7 & 100 Volts.”

Features

• Four channels, 100 watts, 100 / 70 volt

• Input 8Ω, 100 watts

• Euroblock strain-relief connectors

• 1U, 19 inch rackmount tray

• Frequency response 40 Hz to 20 kHz +0, -1 dB

• Separate mounting tray and individual transformers available

Options

• MT 4 rackmount tray with four transformers (shown below)

• KT 4 rackmount tray only

• TF 4 individual transformers

Data Sheet-1

MT 4

1 2 3 4

MADE IN U.S.A.

RANE CORP.

MT 4

+

IN OUT

–

100V 70V COM

+

IN OUT

–

100V 70V COM

+

IN OUT

–

100V 70V COM

+

IN OUT

IN OUT IN OUT IN OUT IN OUT

–

100V 70V COM

+ –

100V 70V COM

+ –

100V 70V COM

+ –

100V 70V COM

+ –

100V 70V COM

Rubber
washer

Rubber
washer

KT 4

tray

Mounting

washer

#10
washer

Nut

Screw

1.5”

Max

4.2” Max

Primary

Black

(+)

White

(–)

Green

100

Yellow
Tap

70

Red

common

MULTICHANNEL TRANSFORMER

Rear Panel

Parameter Specication Limit Units Conditions/Comments

Transformer Rating 100 Wat ts Maximum average power

30 Wat ts Maximum continuous average power

..........Connectors Chassis mounted Euroblock Strain relief

..........Chassis 1U rack-mount tray

Input voltage 28.28 Vrms 100 watts / 8Ω
Output Tap 1: Voltage 70.7 Vrms 50Ω load
Output Tap 2: Voltage 100 Vrms 100Ω load
Frequency Response 40 to 20 kHz +0, -1 dB 100 watts with specified load
THD 0.1 typ % 1 kHz, 100 watts
THD 0.2 typ % 40 Hz to 20 kHz, 100 watts
Unit: Panel Construction 12 gauge steel

..........Size: 1U 1.75"H x 19"W x 9"D 4.45 cm x 48.26 cm x 22.86 cm

..........Weight 18 lb 8.2 kg

TF 4 Transformer, 100 V / 100 W

Figure 1. Schematic Figure 2. Perspective Figure 3. Top View Figure 4. Mounting, Side View

Insulation & Flammability

1. Insulation materials compatible with surface operating tem­pertaures > 60°C.

2. All materials flammability rated UL94V0.

Electrical

1. Primary DC resistance: Black-White < 500 mΩ

2. Secondary DC resistance: Red-Yellow < 4Ω, Red-Green < 6Ω.

3. Magnetizing Inductance: Primary: > 1H (1V, 100 Hz)

4. Leakage Inductance: Primary (secondaries shorted): 20 µH.

Performance Specications

1. Max Output Power: 100 Vrms @ 1 Arms.

2. Average Input Power (for thermal dissapation): 30 W.

3. Maximum Power Loss: <20 W @ 100 W Output (8Ω load).

©Rane Corporation 10802 47th Ave. W., Mukilteo WA 98275-5098 USA TEL [phone] FAX [phone] WEB www.rane.com

Data Sheet-2

All features & specifications subject to change without notice. PN 15178 DOC 108152

Figure 5. Colored leads connect

to labelled circuit board.