Sound system. Astell & Kern has conducted extensive research to accurately deliver music how the artist's indented and with the emotion of live performances to lovers of music everywhere. We have found the answer in the AK T1. The AK T1 is Astell & Kern's very first all-in-one sound system. Wired and wireless DLNA support, High-resolution Bluetooth audio playback via aptX codec, Internet radio service support, providing thousands of music channels, AUX & optical inputs, USB storage & microSD card support, Integrated Astell & Kern music player provides a diverse range of playback options, Hybrid amplifier (analog and digital) optimized for best possible sound, six speaker system delivers the utmost clarity in sound. The AK T1 encompasses all of these features. Power up the AK T1 and immediately begin enjoying your music. The AK T1 is another masterpiece from Astell & Kern that accurately conveys the artist's sound just like you were there when it was performed live. Frequency range: 48 Hz - 22 kHz. Dimensions: 700 x 998 x 404 mm. Weight: 20 kg.