Audio Support & Fan Noise
Audio Inputs /Outputs
Audio-IN - If you want your audience to hear sound that is part of your presentation or video recording, you’ll want to have this. It sends audio data from your computer, VCR, or DVD player to the projector.
Audio-OUT - If you are in a large room and need more sound, you may need to hook up to an external sound system. Audio-Out sends audio data from your projector to an external sound system.
RCA Audio Port - The RCA Audio Port on your projector is used to connect the source device’s audio output to play sound through the projector’s speaker. While perfectly suitable for small presentations, the audio out from your source device should be connected to a receiver for the best stereo sound.
Audio Mini-Jack - This connector is used for transmitting stereo audio. Some projectors and devices may have two of these jacks, one for input and one for output. The only major difference between an audio mini jack and a 3.5mm audio jack is the size of the connectors. An audio mini jack is smaller than a 3.5mm audio jack.
3.5mm Audio Port - This port is used to connect the audio out from your computer’s sound card to the projector so that sound plays through the projector’s speakers. Suitable for small presentations, the projector’s speakers are typical not ideal for larger scale productions or for home theater applications.
Buil-in-Speakers
Many projectors today espeically those that are targeted towards business and classrooms have intergrated speakers. One point of caution is they should not in any way be seen as an alternative to full size speakers in a home cinema, but they can be suffiecent for presentation purposes.
Audible noise
One thing that hasn’t improved with most projectors is the fan noise, which is quite audible when there’s no sound, and tolerable when there is. I guess one just has to play soundtracks a little louder.This is a measurement of how loud the fan noise is from the projector. Sometimes the projector can be set to run in low brightness mode, which will lower the fan noise and often also prolong lamp life.
Another solution that you might want to check out is a hush box to help with a projectors noise level.