Super Budget Sound System

    Almost four months have passed since the publication of " Experience in creating an interactive school information system " and the stream of letters with questions has still not stopped. Many do or try to do something similar. I understand that the topic of organizing IT infrastructure is quite in demand for school system administrators / enikeishikov. Well, if so, I’m publishing a description of the school’s sound system, it might be useful to someone.

    The main function of the system is the scoring of school events taking place in the school hall and in the territory in front of the school entrance with minimal time in accordance with the “come-on” principle, without dragging the speakers and unraveling the wires.
    The idea itself was proposed by the head teacher of educational work in the fall of 2013, in December I sketched a project and purchased equipment with “winter” money. But “switching” unexpectedly fell out of the purchase - a cable / corrugated pipe / box / terminal block, I had to buy all this in May. In May / June, I mounted the system, see what happened.


    Based on the allocated budget (as much as 60 thousand rubles), the equipment of the Roxton line was chosen (only a respected UFO, do not ban me from mentioning this brand, I do not do advertising, I just indicate the brand of the equipment used).

    The central equipment (music server, aka the old Compac NX6110 laptop and AZ-560 power amplifier) ​​is installed in a rack with school servers. Since the amplifier is solidly heavy, I had to take the last power shelf under it. Because of this setup, access to the amplifier terminals on the rear panel became very inconvenient, so I had to install an intermediate terminal box.

    Here is a photo of the audio equipment in the rack:


    6 PA-20T (ROXTON) ceiling mounted two-way loudspeakers in the 20 W mode are embedded in the hall into the suspended ceiling. However, as practice has shown, it will be necessary to switch to 10 W mode, now there is a very big difference in the sound level in the hall and on the street, but there is no separate adjustment for the zones in the amplifier. Internal loudspeakers are loaded on the notification zone No. 1.


    Outside there are two outdoor all-weather outdoor speakers ROXTON CS-840T with a power of 40 W (notification zone No. 2)


    For users (of course, not for everyone, but in accordance with the assigned access rights), the sound system can be controlled in two ways:
    • using a computer in the workplace. The VLC player is controlled via the web interface.
    • using a mobile device (phone or tablet) that runs on the Android operating system. Using the VLC remote application . A tablet or phone is connected to the school network via a WiFi access point.

    Files are added to the media library (network folder on the media server with the appropriate rights assigned) by the users themselves (they already know how to do this, hurray - two years have passed for good reason!).

    For voice messages, there was an idea to use Zello, but the delay was more than 1 second, and this option had to be abandoned.

    So, below you can see the structural diagram of the sound system:


    System specification:

    • AZ-560 (Roxton) power amplifier 560 W, selector 6 zones - 19 700 rubles.
    • ROXTON CS-840T outdoor loudspeaker 40 W - 2 x 5500 = 11 000 rub.
    • PA-20T (ROXTON) - two-way ceiling loudspeaker, 20 W - 6 x 1200 = 7200 rub.
    • ShVVP cable 2 * 1.5 - 150 m. X 12 = 1800 rubles.
    • Corrugated PVC pipe 100 mx 1 = 360 rubles.
    • Distribution box 6 x 30 = 180 rubles.

    Only about 42 tons.

    I paint everything in such detail because, based on the experience of previous publications, there will be many implementation questions from people who are not as savvy as Habr users. Therefore, I decided - it is better to make the description detailed and clear once, not even for specialists.

    Plans for the use of the sound system - morning exercises before classes (in the lobby or on the street, depending on the weather), broadcasting of children's Internet radio stations in changes and shift changes (with reference to the schedule).

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