Energizing Your Systems and Getting the Audience
Powering Up the Equipment
If you are using a car as the base for the projector and DVD, you can easily use the battery terminals of your car to power up your equipment through an inverter which will convert the DC power to the required 110 V AC required by most equipments. Do not stint on the capacity of the inverter as this is the heart of your power source. If you require 300w of power, look for an inverter that will give you at least double, if not more, than that output. This is because battery capacity diminishes over time and you may run out of power when you most require it. Portable silent generators can also be used, but the sound is still audible and can be distracting. Alternately set up a separate battery source for your drive in theatre. You can also arrange to run your car if the hum of the engine is acceptable.
The Sound System
For this you need to set up an FM transmitter which would have a range of about 150 feet so that sound is easily transmitted to the sound systems of the cars that would drive in to your theatre. You need to be careful to see that the frequency you use does not clash with other transmitters and may need to do a little research before you can hit on the correct one. Hook up the transmitter to your power source and the sound output on your DVD and you are ready to roll.
The Audience and Other Considerations
Once you have tested your equipment and are sure that it will work, you now have to get those cars in to your drive-in theatre. If the space is restricted, just telling a few friends and acquaintances may more than fill up your lot. Alternatively send out a few SMSs or E-mails and ask for confirmations. Let them know the movie you are screening.
You need to be careful to see that you do not infringe on copyrights and may need to get the permission of the company owning the movie. They may charge you some license fees but it is better to be on the safe side of the law. If you do not charge admission and show the movie to no more people than would fit in your living room or media room, you would not require any other permission. If local police permission is needed, get it, and see that you do not disturb your neighbors.
You can make up your costs by asking for donations, or by setting up some food or cold drink stalls.
And once you have the audience make sure you tell them the frequency to tune in for the sound, and of course, the time of the next show.