With 4 driver units, this product can produce 42 watts (RMS) output power, best fitting any space in your house for a great listening experience. Built-in Class-D amplifier with 21W+21W RMS power output. Classic acoustic configuration with 1-inch(25mm) tweeter and 4-inch(116mm) mid-bass driver. These speakers feature a TI PCM9211 digital decoding chip that accurately reproduces the source audio. The built-in tweeter is no less than 25 mm. The beautiful wooden side panels of the R1380T bookshelf speakers make an impression, an example of elegance and luxury. The right side panel features the bass, treble, and volume controls. Of course, an IR remote control is also included.