Absolutely! But understand that your available power supply is ultimately the limiting factor as to how many sirens the Vista 20P can support.
First thing to remember is that your Vista 20P has a 12 VDC siren output with 2 amp maximum current. On the Vista 20P, only terminals 3 and 4 are available for wiring sirens. When you wire siren positives to terminal 3 and siren negatives to terminal four on the panel, you create a parallel wiring setup. This divides the control panel current (2 amps) equally amongst the sirens.
A siren like the Honeywell WAVE2 Two-Tone Siren requires 500mA (0.5 amp) of current. The Vista 20P would be able to support up to four of these sirens without going over its 2 amp limit.
There are two ways around this power restriction. First, you could purchase an additional power supply, like the 1.2 amp Honeywell Ademco AD12612, to expand beyond the Vista 20P's 2.0 amp limit.
OR
You could connect a Honeywell Ademco wireless receiver. The receiver links to a wireless siren, like the 95 dB 5800WAVE, that you can plug directly into a wall socket for power.
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