Honeywell NOTIFIER ACT-70 Product Installation Document

This product has been certified to comply with requirements in the Standard for Control Units and accessories for Fire
Alarm Systems, UL 864 9th Edition. Operation of this product with products not tested for UL 864 9th Edition has not
been evaluated. Such operation requires the approval of the local Authority Having Jurisdiction.
Applications
When used with the high-level 70.7V output of a Notifier amplifier in riser mode, a ACT-70 Audio Coupling
Transformers will provide a means to drive thousands of amplifiers in large audio system applications.
• It attenuates high-level 70.7V
• It isolates input from output.
• It provides CMNR (Common Mode Noise Rejection)
The low-level signal created by the ACT-70 may be used to deliver audio to analog amplifiers, as well as to the AUX B
inputs of the DVC and DAA. Refer to the Digital Audio Manual for more DVC and DAA information.
The ACT-70 provides electrical isolation between its input and output and attenuates the signal from high-level audio to
low-level audio. Ground faults on the AUDIO IN input must be detected by the amplifier driving the audio. Ground faults
on the THRU output must be detected by the destination. Ground fault detection for the input and output can be merged
together by using the "COMM" input. Up to 40 analog audio amplifiers may be fed by the output of an ACT-70 as long as
the wiring does not exceed 200 ft (61 m), 18-12 AWG (0.75-3.25 mm
Signal from a Digital Audio Amplifier in Riser Mode
The ACT-70 will accept high-level audio signals from any 70.7V digital audio amplifier. It can then drive DVC audio
systems, AA-120/AA-120E, AA-100, and/or AA-30/AA-30E audio amplifiers, as well as the XPIQ-AIB audio input
boards.
The high-level output of the amplifier will support a Class A or Class B wiring arrangement and can be fed to the input of
up to 500 ACT-70 units. The outputs of each of the 500 ACT-70 transformers may then be used to feed a low-level audio
signal to the input of as many as 40 additional AA Series amplifiers. The output of an ACT-70 supports Class B wiring
only. Where Class A is required, all amplifiers served by an ACT-70 must be housed in the enclosure containing the
ACT-70.
ACT-70 Audio Coupling Transformer
Product Installation Document
to create a low-level audio signal.
RMS
Figure 1 The ACT-70
12 Clintonville Road
Northford, CT 06472-1610 USA
203-484-7161 • FAX 203-484-7118
www.notifier.com
PN 53240:A 7/07/2008 08-484
2
).
ACT-70 Input
P1 Low-level
audio plug pins
ACT-70 Output