| DSPPA PA System EN54 Evacuation Conference System PA Speaker Amplifier Manufacturer |
| https://dsppatech.com Direct contact link Guangzhou DSPPA is the chief editorial company of the Technical Code for Public Address System Engineering which is the first Chinese standard for PA system engineering filled up the technical vacancy in the PA industry.  exp***@dsppa.com /dsppapavasystem/Telephone: 020 37166********* |  |
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