The TR 225 is a two-way loudspeaker with 2-15" LF drivers and a JBL compression driver. By incorporating different low-pass filters in each of the LF drivers, the TR 225 offers a smoother performance through the crossover region. Adapted from technology originally used in the classic UREI 813 studio monitors, it greatly improves the power response of the speaker. All speakers in the TR Series are built with a plastic baffle that integrates an HF constant directivity horn and bass ports. The plastic baffle allows for a larger horn in the cabinet. The advantage here is that a larger horn controls a greater range of frequencies. Each TR loudspeaker houses a liquid-cooled JBL high frequency compression driver made with a pure titanium diaphragm and JBL's patented diamond surround that delivers crisp highs and increased system clarity. And for even sound throughout your entire listening area, the TR Series is designed with JBL's "Optimized Aperture?" horn which was first used in our popular concert touring systems. And while the woofers in most systems in this price range have a 2" voice coil, the TR Series comes with a 2 1/2" edgewound voice coil for greater power handling capabilities. JBL pioneered the use of the flattened wire, called "edgewound", in voice coils to give speakers greater output sensitivity (AKA more sound per watt). What's more, the output sensitivity in the TR speakers is further enhanced with a hefty-sized magnet. To insure balanced sound, the TR Series utilizes a crossover network that is engineered to survive years of road use and offer outstanding acoustic performance. And for added convenience, all models have multiple input connectors that allow you to "loop through" to additional cabinets without the need of additional "home run" cables to the amplifier.So just by looking at the price, you may not believe that the TR225 is actually a JBL....But take a listen. It's loud. It's clear. It's consistent. It's JBL.