The ALGO 1825 Duet Plus is a high performance low-frequency loud ringer
compatible with most business telephone systems in office and industrial
applications. The unit is compatible with dry contact closure, analog
telephones, and Nortel digital telephones including Norstar, Business
Communication Manager (BCM), Meridian 1, and Communication Server 1000
Loud ringing can be activated by a relay or switch
closure (dry contacts), low voltage detection, 90V analog telephone
ringing, or any Nortel TDM digital business telephone.
Non-Irritating Tone Output
The 1825 Duet Plus can be wall mounted in office or quiet warehouse
applications utilizing its built in speaker to generate up to 93 dBA (at
1m) warble tones. An optional 1185 Horn Speaker is
available for very loud or outdoor requirements (112 dBA at 1m). The
combination of lower frequency warble and high sound pressure level
creates an extremely effective and pleasant telephone alert for large or
Amplified Voice Paging
An additional feature of the 1825 Duet Plus is its capability to
provide amplified voice paging as a separate application or in
combination with loud ringing utilizing the same speaker. For small
business telephone systems this provides an extremely cost effective and
high performance solution for loud ringing and loud paging into a
warehouse, storage yard, or machine shop. Separate volume control is
provided for voice page and loud ring levels.
Other useful features include adjustable warble frequency, adjustable volume, and integrated test button.