What's the difference between 70V and 100V line speakers?
Both 70V and 100V are constant-voltage systems that allow long cable runs and easy zone expansion. 70V is more common in North America and smaller facilities; 100V is standard in Europe and large installations. They use the same transformer-coupled wiring principle but are not interchangeable—confirm your amplifier output voltage before purchasing speakers.
Can I mix PoE and analog speakers in the same system?
Yes, if your control unit supports both. PoE speakers from Axis or 2N can coexist with analog 70V zones via separate amplifier modules or hybrid controllers. However, you'll manage two different audio paths and power feeds—simpler to standardize on one technology per facility if possible.
How do I calculate total wattage needed for a multi-zone paging system?
Add the nominal wattage (at 8Ω or line-voltage rated power) of all speakers in a zone; don't simply use the amplifier's maximum rating. For example, five 5W speakers = 25W minimum amplifier; use 40–50W to allow headroom and prevent distortion. Account for simultaneous use across zones and peak announcement demand.
What's the minimum IP rating for outdoor speakers in a warehouse?
IP54 resists dust and light splash but is not suitable for rain or hosing. IP65 is the practical minimum for outdoor loading docks, yards, and wet areas. IP67 (temporary submersion) and IP69K (high-pressure jets) exist but are overkill for most facilities. Check local climate and cleaning practices to avoid premature corrosion.
Do paging speakers need special cabling or conduit?
Standard Ethernet (Cat5e/6) works for PoE speakers; analog 70V/100V speakers use standard speaker cable (16–12 AWG depending on distance). Outdoor installations should use UV-rated PVC conduit or direct-bury cable to protect against UV degradation and moisture. Verify speaker accessories include appropriate cable terminations and strain relief.
How do I ensure paging announcements are intelligible in a noisy environment?
Choose speakers rated 95+ dB SPL and position them to minimize echo and reverberation. In warehouses, use directional horns aimed at occupied zones rather than omni-directional ceiling speakers. Test speech intelligibility (clarity of words, not just volume) during commissioning. Consider zone-based distribution—multiple smaller speakers at moderate volume beats one loud speaker in a large space.