HDVA 600 This high-class amplifier for headphones features the latest wiring details, along with subassemblies selected meticulously by acousticians as having the lowest possible tolerances. Its strictly symmetrical wiring layout achieves distortion levels which are almost unmeasurably low. ‚The Soundraiser‘ plant receives signals via symmetrical XLR inputs and possesses symmetrical 4-pin front sockets for suitably configured headphones. Technical Data HDVA 600 EAN UPC Article. No.