Максимальная длина кабелей HDMI, S/PDIF?

Товарищи, подскажите пожалуйста какова максимальная допустимая длина кабелей для передачи сигналов S/PDIF и HDMI без регенераторов. Если есть возможность дайте ссылкы на технические статьи.
Заранее спасибо.

HDMI (Cables and Connectors)
There are many HDMI Adopters working on HDMI solutions that extend a cable’s effective distance from the typical 10 meter range to much longer lengths. These companies manufacture a variety of solutions that include active cables (active electronics built into cables that boost and extend the cable’s signal), repeaters, amplifiers as well as CAT5/6 and fiber solutions

S/PDIF (Cabling details)
S/PDIF (IEC-958) uses 75 ohm coaxial cable and RCA connectors. 75 ohm coaxial cable is inexpensive, because it is the same cable as used in video transmission (you can buy a video cable with RCA connectors to connect you S/PDIF equipments together). Coaxial S/PDIF connections work typically at least to 10-15 meter distances with good 75 ohm coaxial cable.