The Bedrock BTB65 Talkbox is a professional STIPA signal generator that emits the standardised IEC 60268-16 modulated test signal through integrated loudspeakers. It is designed for use as the signal transmitter in STIPA measurement setups for indoor voice alarm system commissioning, PA/GA system acceptance testing, and annual inspection of public address systems in standard acoustic environments.
In a STIPA measurement, the talkbox serves as the signal source: it connects to the PA system's amplifier input and broadcasts the IEC 60268-16 test signal through the installed loudspeakers. A STIPA-capable sound level meter (the receiver) is then positioned at the measurement point and measures the speech intelligibility of the received signal. The BTB65 is sized and powered for standard indoor environments where moderate acoustic output is sufficient to achieve an adequate signal-to-noise ratio at all measurement positions.
The BTB65 is suitable for most indoor voice alarm and PA systems in standard offices, hotels, hospitals, schools, and retail environments where the PA loudspeakers can achieve a sufficient signal-to-noise ratio with standard output levels. For large auditoria, stadiums, outdoor PA systems, transport hubs with high background noise, or any environment where the BTB65 cannot achieve adequate signal-to-noise ratio, use the BTB115 Advanced Talkbox which provides up to 115 dB SPL maximum output.
For a complete STIPA measurement kit, pair the BTB65 with one of the following receivers:
For a successful STIPA measurement with the BTB65: (1) Connect the BTB65's line output to the PA amplifier input jack — do not connect to a power amplifier output. (2) Set the BTB65's level so that the PA system produces an output level at least 10 dB above the background noise level at the most distant measurement position. (3) Confirm the BTB65 is transmitting the IEC 60268-16 test signal correctly by verifying that the STIPA receiver shows a valid signal level in the appropriate frequency bands. (4) Position the STIPA receiver (sound level meter) at the measurement point with the microphone at the correct height (typically 1.2 m or 1.5 m depending on the standard) and pointing towards the nearest loudspeaker. (5) Start the STIPA measurement and wait for the result. Repeat at all required measurement positions and record all results for the compliance report.
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