Some companies such as Sonos have launched wireless subwoofers recently. These products typically tie in with an existing network or with a proprietary network that is made up by the components which are sold as a wireless system. The question is how useful is it to purchase a wireless subwoofer in a typical home theater setting. I will try to answer this and give you my thoughts on the subject.
First of all, wireless subwoofers are quite similar to regular subwoofers in that they incorporate an amplifier. And amplifiers crucial for producing the large wattage that is required for driving the war far which is incorporated into the subwoofer enclosure. Typically you will need an amplified is capable of at least delivering a hundred Watts. They are even subwoofers that can deliver over 1000 Watts. Surely, you wouldn’t want to distribute such a wattage over a speaker cable.
Therefore, using a simple RCA cable would do the trick. Alternatively, you can purchase a wireless subwoofer which will eliminate the long cable. However, keep in mind that most subwoofers are placed rather close to the AV receiver and thus the connection is usually easily made. However, one issue that often occurs are ground loops. Ground loops are a result of there being a different potential in different devices. Connecting those devices by using an RCA cable can cause humming. Having is quite detrimental in particular when talking about subwoofers because atypical hum is at 50 or 60 Hz. That is the frequency that is mostly output by subwoofers.
A wireless option would typically eliminate this hum because it physically disconnects the source from the subwoofer. There are also some models of subwoofers that use an optical input. By using an optical cable, you can also eliminate the ground connection and thus don’t have the issue of ground loops.
When you purchase a wireless subwoofer you want to make sure that the frequency of the signal doesn’t interfere with any other wireless devices in your home. If you are using wireless rear speakers then make sure that there is no conflict between the signal going to the rear speakers and the signal going to the subwoofer. As an alternative, I recommend purchasing a speaker kit which offers a single transmitter for the subwoofer as well as the rear speakers. That will avoid any potential conflict.