Do I need a subwoofer with the Control 52?

Yes for full-range sound. The speaker rolls off at 180 Hz, so bass and kick come from a Control subwoofer such as the 50S/T, 40CS/T or 60PS/T.

How many Control 52 speakers can one system use?

JBL specifies systems of two to four satellites with a matching Control subwoofer. The 16-ohm impedance lets several share an amplifier channel.

Can I mount it on a wall and aim it?

Yes. The included surface-mount bracket allows angling up to 45 degrees, which helps aim sound down into a room or toward seating.

Is the Control 52 weatherproof?

No. It is not water resistant, so use it indoors or in sheltered areas, not outdoors or in wet rooms.

What amplifier power does it need?

It is rated at 50 W continuous program power and 16 ohms. A modest amplifier channel can drive several satellites, but check the total load against your amp's rating.

Is it Bluetooth or voice controlled?

No. It is a passive wired speaker with a locking 2-pin connector. Bluetooth and voice control come from whatever source or amplifier you connect it to.