Electro-voice 15000 specification and instructions

General Product Description

Electro-Voice® 70.7V/100V Output Transformers are
designed for efficient transmission of amplifier power to
distributed sound systems or multiple loudspeakers. The
transformers accommodate a wide range of user
requirements for impedance matching, output voltage and
power. Transformers are reflective devices and will deliver
a ratio of the voltage applied to the primary, or reflect a ratio
of the secondary load. Voltage and Impedance ratios are
listed in the table on page 2. The primary and secondary
windings are reversible. Each model can be used to step-up
or step-down.

Primary and secondary windings are electrically isolated,
so that the transformer offers a balanced load to the amplifier
and a balanced source to the loudspeakers. Low insertion
loss, low distortion and high efficiency are maintained
throughout the dynamic range of each transformer and
throughout the frequency band of 35 Hz to 15,000 Hz. The
transformers have an insertion loss of no more than 1.0 dB
and draw that much extra power from the amplifier to supply
rated power to the load. All transformer terminals are

0.25-inch blade type quick-disconnect wire terminals
allowing either wrap-and-solder connections or crimp type
quick-connect wire terminals for convenience of installation.
Terminals are identified by optimum application for rated
power at 35 Hz.

Electro-Voice’s 70.7V/100V Output transformers are
amplifier accessories that increase flexibility and utility of
any power amplifier.

Transformer response at low frequencies is limited by core
saturation. A clear indication of core saturation is a sudden
drop in primary impedance. The graph on page 2 shows
the typical Electro-Voice® 15000 Series Output Transformer
has flat primary impedance to 35 Hz. Restricting the 15000
Series Output Transformer to above 60 Hz will effectively
double the transformer’s power handling. Insertion Loss is
the difference between power applied to the primary and
power available on the secondary. The graph also shows
the typical Insertion Loss of the 15000 Series Output
Transformer is 0.5 dB. Distortion and Phase Response are
shown in the second graph on page 2. Distortion is excellent
and remains well below 0.1%. Phase response is less than
9 degrees at 15 kHz.

15000 Series

Transformers

COMMER CIAL

Architects’ and Engineers’ Specifications

The transformer shall deliver within ±1.0 dB of its full
rated power over the frequency range of 35 Hz to
15,000 Hz with a maximum insertion loss not greater
than 1.0 dB for the most unfavorable impedance
combination. The transformer shall deliver rated power
at 35 Hz with no more than a 10% increase of power on
the primary. Primary and secondary windings shall be
electrically isolated, and shall provide a balanced line to
the load. The transformer shall utilize 0.25-inch blade
quick-connectors for convenience of installation and
wiring. The transformer shall be the Electro-Voice®
Model__________.