TINY HI-FI Audiophile Speakers - TOO Slim+ 2-Way Bi-Amplified in Black-Granite Only 4.8" Wide! Micro-Format Stereo Desktop Speaker fits nearly anywhere! Internally Bi-Amplified! Digital Class "T" 88-Watt Stereo Amplifier Inside Each Speaker 92% Peak Efficiency / Dual Tubular Copper Heat-Pipes / Granite Thermal Mass Handcrafted in Colorado from the finest materials & components available Fully Compatible All Audio Sources - PC, MAC, Laptop, Apple, Iphone, Ipad, Ipod, Smartphone, MP3/4, Pre-Amp, Mixer, Console, etc... ( 1/8" Headphone or RCA Jack)