Qsc audio OT-300A User Manual

PERFORMANCE ACCESSORIES

1675 MacArthur Boulevard
Costa Mesa, CA 92626
Ph: 800/854-4079 or 714/957-7100
Fax: [phone]

www.qscaudio.com

OT-300a

Output Autoformer

Basic Description

The OT-300a is a heavy-duty step-up autoformer accessory that adapts
any power amplifier output with a maximum voltage of approximately
17 to 35 volts to drive a 70-volt distributed line with up to 300 watts.
Four voltage taps let you choose the one most appropriate for the
amplifier.

Conversely, the OT-300a can be used as a high-power speaker trans­former, driving loudspeakers with up to 300 watts from a 70-volt dis­tributed line.

The OT-300a autoformer is compatible with any amplifier rated at up to
approximately 350 watts at 4 ohms.It has built-on brackets for convenient
mounting on a panel or in an equipment rack.

Compatible amplifier models

• USA 400

• RMX 850

• MX 700

• PLX 1202

• PowerLight 1.0

• CX 302 and CX 254

• DCA 1222 and DCA 1824

• Any amplifier rated at approximately 70 to 350 watts at 4 ohms

Features

• Adapts low-impedance amplifiers to drive 70-volt lines

• Rugged, heavy-duty construction handles up to 300 watts

• Low insertion loss—less than 1 dB

• Four voltage taps to accommodate any amplifier output voltage

from 17 to 35 volts

• Also suitable for use as a high-power speaker transformer handling
up to 300 watts

Specifications subject to change without notice.

3.11"

79.0 mm

76.2 mm

3.00"

0.375 × 0.25"

9.5 × 6.3 mm

QSC Audio Products, Inc. 1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: [phone] • www.qscaudio.com

OT-300a SPECIFICATIONS

GENERAL INFORMATION

Weight 6.75 lb; 3.1 kg

Voltage taps

Mounting centers

17, 25, 30, and 35 volts

3.00” × 3.11”; 76.2 mm × 79.0 mm

OT-300a

Frequency response

20 Hz–16 kHz, +0, -1.5 dB

Transformer type

Autoformer with EI laminated core

Distortion, 30 Hz–16 kHz

0.1% @ 150 watts; 0.5% @ 300 watts

Connectors

¼” (6.3 mm) male quick-disconnect

Power capacity

Approximately 75 to 300 watts

Insertion loss

Less than 1 dB

Dimensions (h × w × d)

3.13” × 3.75” × 3.50”; 79.5 mm × 95.3 mm × 88.9 mm

OT-300a used as an
output transformer

OT-300a used as a

speaker transformer

Specifications subject to change without notice.

70V out

power

amplifier

distributed

0V (common)

70V

line

70V in

35V
30V
25V
17V

0V

70V
distributed
line

0V (common)

8Ω 4Ω 2Ω

35V

150W 300W

30V 110W 225W
25V 75W 150W 300W
17V 35W 75W 150W
0V

loud­speaker