How to Connect the P-166Ts BUU-02 Interface Unit to a PA Amplifier

The single most common question when fitting a facility with a local warning system is this: will the interface unit actually work with an amplifier, and with which one? Let's break down the electrical connection between the P-166Ts BUU-02 and a PA amplifier — what signal you feed, where it goes, and the order in which to set things up.

Which amplifier input should carry the signal from the BUU-02?

The priority input — line-level or microphone, depending on the amplifier variant. This is the input that overrides background broadcasting. The BUU-02's line output is 0.775 V, which matches the amplifier's nominal input voltage as specified in Russia's GOST R 42.3.01 standard (Table 1). Start with the sensitivity (gain) control at minimum and bring it up gradually — pushing the level too fast can damage the input.

Which amplifier do you need to work with the BUU-02?

Any VPA amplifier with a priority input will do. The matrix VPA-MRX models add a dedicated emergency input and per-zone dry contacts; the multi-zone VPA-MC series offers 24 V backup power; and the VPA-MK PA amplifiers are the entry-level option.

Is the P-166Ts itself installed on site?

No. The P-166Ts belongs to the upstream tier, at the regional control centre. On site you install only the P-166Ts BUU-02 interface unit, which receives the signal over a closed channel and triggers the facility's warning system.

Can the BUU-02 signal go to an ordinary, non-priority input?

You need a genuine priority input (line-level or microphone, depending on the amplifier variant). An ordinary, non-priority input won't do the job: when the alert fires, the message has to cut through and override the background audio, whereas on a regular input the background and the alert would simply mix together.

How much power should you budget per voice-alarm loudspeaker?

Indoors, 3–5 W per loudspeaker is usually enough; reach for 10 W in noisy or high-ceilinged spaces. You can work out the exact per-zone load and the amplifier power — with headroom to spare — in the calculator.