The AAXA P7+ comes with a built-in set of 2-watt stereo speakers that put out decent sound, especially in the mid and high frequencies. It's loud enough for a small group of people to hear comfortably. However, if you plan to show movies or have a bigger audience, I recommend using an external speaker via the projector’s 3.5 mm audio jack or Bluetooth connections. It is interesting that AAXA has put stereo speakers in this projector. Unfortunately, the speakers are so close together that there is little to no discernible stereo imaging.
The noise from the fan in the P7+ surprised me, especially for an LED projector. The fan noise is noticeable in ECO mode. It increased when I set the brightness to BOOST mode. The noise level is above average, but it should not be a deal breaker considering where and how this projector is designed to be used. This projector puts out a lot of heat, so the fans are critical to keeping the projector cool and in good working order.
The P7+ includes a dedicated application that allows casting from both Android and iOS devices. For example, content that is not copy-protected can easily be cast from a YouTube application on an iPhone or iPad in the exact same way it is always done. On the projector, select the MIRRORING button from the main screen. Then select Android or iOS. While playing a video on your phone or tablet, tap the cast icon in the top right corner of the video window and select the AAXA projectors ID. From that point, the projector will launch the A7+ YouTube application and start playing your content. It is pretty much identical.
Not every application installed on the p7+ supports casting. Netflix content is copy-protected, therefor the casting function will not work on this projector.
One of the big benefits of having many Android applications supported on the P7+ is that users can access and play copy-protected directly on the projector from an installed Android application.
Setting up the casting function should be easy, even for someone who is not tech-savvy.
I did experience some lag and buffering but reduced this by adjusting the resolution of cast content to standard definition. I think this projector's casting experience will outweigh any minor hiccups the user may experience.
Should the user find the number of supported applications too limited or OS-based features not robust for them, there are many streaming sticks starting at $20 that support libraries of applications and functionality that can easily be plugged into the P7+.