MPT-70 Audio Distribution Interface
(Isolated 70-volt Interface)
The MPT-70 allows the MPR-450 power amplifier to provide 70-volt operation
for distributed sound systems. The system allows six independently-adjustable
70-volt zones at 75 watts each. Outputs may be combined for 150-watt or
300-watt zones. Convenient barrier strips are provided at the back panel.
- Six 70-Volt Outputs at 75 Watts Each
- Convenient Back-Panel Barrier Strip Connections
- Outputs Can Be Combined for 2X Power
- Components Available for Partial Build (1-5 Channels)
- Most Cost-Effective and Flexible Design
The Miles Technology MPT-70 provides six independent 70-volt output
channels, at 75 watts each (450 watts total), in a compact, rack-mount
Designed to work with the MPR-450 Six-Channel Power Amplifier, the MPT-70 is
perfectly suited for distributed sound systems and applications requiring
efficient audio power transmission over long distances, such as ceiling
speaker installations, paging systems, background music, and multi-room
The multichannel design approach of the MPT-70 and MPR-450 combination
provides superior system performance by allowing very precise and
convenient control of sound levels, resulting in better sound
distribution throughout the venue.
Each of the six MPT-70 outputs is fully isolated, providing improved safety
and total ground isolation.
The 70-volt outputs can be combined in pairs for additional flexibility.
150-watt and 300-watt outputs can be created at 70 volts or 140-volts,
which can be used in combination with 75-watt outputs.
The design of the MPT-70 saves installation time also. The unit is built
into a complete rack chassis, and all connections are made to heavy-duty
barrier strips on the back panel, conveniently accessible at the back of
the equipment rack.
For applications not requiring all six 70-volt outputs, the MPT-70
components are available individually. The MPT-70C is the chassis with
barrier strips, retained fasteners, and supplied with all necessary
The MPT-70XF is one 70-volt, 75-watt transformer. Assembly into the
MPT-70C is quick and simple, using a minimum of hardware and
Made with pride in the U.S.A., all Miles Technology products are backed
with our comprehensive three-year warranty.
75 watts per channel at 70.7 volts (67-ohm load)
67 ohms or greater per channel
20 Hz to 20 kHz, +0/-3 dB
Total Harmonic Distortion
< 0.05%, 1 kHz, at rated output
< 0.5%, 50 Hz to 20 kHz, at rated output
Voltage gain = 12 dB
Barrier strip terminals, 6-32 screws, 0.375-inch centers.
3.5 in. x 19 in. x 12.7 in.
(8.9 cm x 48.3 cm x 32.3 cm)
30 lbs (13.6 kg)
The MPR-450 Six-Channel
450-watt Power Amplifier is perfect for driving the MPT-70 in
multi-zone and distributed sound systems. Rated at 75 watts per
channel into 4 ohms with all channels driven, it is designed
for continuous, demanding use.
Its six independent amplifier channels each have a balasnced input
and a back-panel gain control. Indicators show signal presence and
clipping for each channel. Cooling is accomplished with a variable-speed,
super-quiet fan. The unit is fully protected from short circuits, high
temperature, and DC offset.