The picture on the box that contains the JBL On Air Control 2.4G displays two speakers, a small transmitter, and a little remote, but omits the tangle of wires required to get any sound out of the system. It is, after all, a wireless speaker system--so we understand the motivation of JBL's marketing department--but then again, we're not surprised. The new JBL, like every other "wireless" speaker system on the market, comes with at least some wires--the wireless moniker refers to the wireless signal transmission between the source and the On Air Control 2.4G's left speaker. The versatile system was designed for a number of applications, including use as the surround channels in a multichannel home theater; as a second-room music system; and as a primary speaker system for any audio source (DVD/CD players, cable/satellite boxes, iPods, computers, and other devices). Unfortunately, the JBL system's connectivity issues may leave some potential home theater and home audio enthusiasts without a viable hookup scheme. That said, unlike the underwhelming experience we've had with many previous wireless speaker solutions--most produce iffy sound quality and many are plagued with distortions and sonic dropouts--we're happy to report the $350 JBL On Air Control 2.4G's operation was glitch-free, and the sonics were nearly the equal of any decently designed wired speaker of its size and price.
The JBL On Air Control 2.4G system includes a pair of compact two-way speakers; a speaker power supply; a transmitter; transmitter power supply; adjustable speaker wall brackets; all of the necessary hookup cables including one 33-foot-long speaker wire; and a small credit card style remote control. The "Control" moniker in the product's name is actually a preexisting JBL speaker line. In fact, aside from the wireless capabilities, the speakers are essentially identical to the $130 Control1Xtreme models. They're 9 inches tall, 6.1 inches wide, and 5.5 inches deep, and the rugged, black plastic cabinets feel nice and solid. The left speaker is where all the action is: it includes the wireless receiver, and it also has a power supply that must be plugged into an AC outlet. To get the right speaker up and running, you'll need to run--yep, you guessed it--a speaker wire from the left speaker over to the right speaker. Yes, the power cord and the left-to-right umbilical wire certainly ruin the fantasy of "wireless" speakers. At the same time, it does give the On Air Control 2.4G much more mobility in a given room: using them as rear-surround speakers, for instance, you won't have to string wires from the front of the room to the back.
The speakers are standard black monitors--they won't win any beauty contests, but their relatively small size and curved edges should help them blend into the background of most rooms. They're magnetically shielded, so placement near a TV shouldn't be a concern. The rubberized top and bottom give them a rugged appearance, but they're not all-weather outdoor models. JBL does throw in a pair of wall-mount brackets, though, and the speakers have standard threaded inserts on their underside and rear for attaching third-party mounting solutions as well.
Popping off the removable grilles, we took a closer look at the speakers themselves. Each features a 0.5-inch titanium dome tweeter and a 4-inch woofer. The left speaker houses the left and right channel's 15 watt amplifiers, and includes a mini-jack input for connection to a second local audio source, as well as a subwoofer output. Both the speaker and the transmitter have a small switch that lets you toggle between one of four wireless channels (useful for avoiding interference, or if you're operating multiple On Air speaker systems in a single house).
The speakers receive a stereo signal from the included 2.4GHz transmitter. Not much larger than a Treo smartphone, the tiny unit will slip into whatever extra space you have in your equipment rack. The always-on transmitter is AC powered, of course, and needs to be tethered to your primary audio source--a DVD player or an A/V receiver, for instance. The only connectivity available is a single pair of line-level RCA inputs. That means the transmitter will interface with any piece of audio/video gear with an analog A/V output or even just a headphone jack (a minijack-to-RCA adapter cable is included).
Unfortunately, the single stereo connection limits the usefulness of the entire On Air Control system when connecting to A/V receivers. Whether you want to use the On Air Control 2.4G speakers as the rear channels in a 5.1- or 7.1-channel surround system, as front stereo speakers, or as Zone 2 speakers in another room, your A/V receiver will need to have preamplifier outputs. The problem is few moderately priced ($500 and less) receivers are so equipped. Why JBL engineers didn't include speaker level inputs on the transmitter to ensure universal compatibility is impossible to fathom, and we guess the RCA-only input scheme might be a deal breaker for some potential buyers. On the other hand, JBL is already saying this is merely the first product in a larger On Air wireless speaker lineup, so it wouldn't be a surprise to hear that a system with speaker-level inputs is on the drawing board.