Accessories (optional)
Installation of TK-150 transformer for passive crossovers
Tools required:
▪
Phillips #2 screwdriver
▪
3/16-inch (5 mm) flat blade screwdriver
High Pass Filter Requirements:
!
Caution!
Failure to use the proper high-pass filter may result in damage to the amplifier.
The TK-150 audio transformer is designed to be used with Butterworth 24 dB/octave high-pass
filter inserted in the signal chain at the input to the amplifier. The filter corner frequency
should be set at 50 Hz for full-range models and at 40 Hz for the EVC-1181S subwoofer. This
filter, in conjunction with the Automatic Saturation Compensation (ASC) feature, protects the
amplifier from damage caused by transformer saturation at low frequencies and allows any
number of transformers to be driven on the same 70V or 100V line, up to the rated power of
the amplifier. At the same time, the ASC circuit preserves the low-frequency extension of the
system by adding incremental filtering only to the extent required by the current level in the
loudspeaker. Following the parameters below, the TK-150 is capable of delivering up to 300
Watts to the loudspeaker by connecting a 100V drive line to the tap labeled DO NOT USE
(150W at 70.7V) if a Butterworth 24 dB/octave active high-pass filter tuned to 66 Hz or higher
is inserted in the signal chain at the input to the driving amplifier.
Notice!
Each group of four terminals is electrically connected in parallel to the group of four terminals
directly across from it.
The wattages charted in these two columns represent the wattage available from each of the
three transformer taps at the designated voltage.
70V
100V
Z nom
Transformer: (Standard 50 Hz BW20
High-pass)
37.5 W
75 W
130 Ω
75 W
150 W
65 Ω
150 W
Do Not Use
33 Ω
Transformer: 89 Hz High-pass per
EN54-24 spectrum
50 W
100 W
100 Ω
100 W
200 W
50 Ω
200 W
400 W
25 Ω
Table 8.1: Transformer ratings and taps
8
8.1
en
35
Electro-Voice
Installation manual
2018.01 | 01 | F.01U.345.998
