-------------------------------------- The CR-X series significantly improves thermal efficiency by incorporating a Class D power amplifier driven by PWM (pulse width modulation). In addition, by reducing the load on the power amplifier board caused by heat, the failure rate is reduced, and by controlling the output power, efficiency and sound quality are improved compared to the previous model (CR series) which used a class AB amplifier. However, due to the specifications of products that use this power amplifier, a certain amount of slight harmonic noise will inevitably be generated. To improve these issues, a noise filter would need to be installed inside the amplifier, but the cost of the CR-X series does not allow for the implementation of such a filter. The design is such that it is barely noticeable when music is playing, but please turn off the volume on the front panel after music playback has finished. -------------------------------------- MACKIE CR-X Series The newly evolved CR Series desktop speakers, incorporating extensive Mackie professional studio monitor speaker technology, deliver high-quality studio monitor sound without breaking the bank. From high-end studios to desktop PC speakers, the CR Series offers affordable pricing and a compact design. They're perfect for a wide range of applications, from home studios and multimedia content creation, post-production, podcasting, and computer gaming. CR Series monitor speakers are equipped with high-power amplifiers that deliver clear, crisp sound. All models feature a wood cabinet, a polypropylene-coated woofer, and a 0.75-inch ferrofluid-cooled silk dome tweeter. Mackie's proprietary waveguide design delivers unparalleled clarity across the entire frequency range to the optimal listening area. The smooth brushed metal front panel and the CR series' signature green trim are both aesthetically pleasing and inspiring. The built-in amplifier/volume control knob on the CR series can be placed on the left or right side, allowing you to freely choose the position that best suits your setup and working environment. The set includes a speaker cable to connect the CR series with the power amplifier to the CR series with the passive amplifier, a stereo mini/RCA Y-cable to connect the analog audio output terminal (stereo mini) of your computer to the input terminal (RCA red and white) of the CR series, and a stereo mini/stereo mini cable to connect your smartphone or music player to the STEREO IN of the CR full-range model, so you can start enjoying music the day it arrives.