The only critical point concerning S/PDIF cable length AFAIK is that it should not be shorter than 1.5 meters so that internal reflections are not timed to confuse the DAC's clock. Your longer length should be OK, although Sidssp's point about noise is certainly pertinent.
SPDIF Cable Length Critical?
I have decided to buy a Qsonix Music Server and want to place the unit in an adjacent room to my listening room. I will be using the SPDIF digital input to my Resolution Audio Opus 21 CD player for the DAC. The CD player is located next to the preamp and its output is connected using a 1 meter analog interconnect.
This arrangement would require a SPDIF digital cable with a length of about 25 feet to reach the DAC. I realize that it is important to keep analog interconnects and speaker wires reasonably short, but what about a digital connection? Is length critical in that application? Would I sacrifice performance by running a 25 foot long digital interconnect?
I suppose an option would be to buy a separate DAC with multiple types on digital inputs, such as a Benchmark. This would give me more connection and cabling options. Would using a different type of digital cable be better for a 25 foot run?
This arrangement would require a SPDIF digital cable with a length of about 25 feet to reach the DAC. I realize that it is important to keep analog interconnects and speaker wires reasonably short, but what about a digital connection? Is length critical in that application? Would I sacrifice performance by running a 25 foot long digital interconnect?
I suppose an option would be to buy a separate DAC with multiple types on digital inputs, such as a Benchmark. This would give me more connection and cabling options. Would using a different type of digital cable be better for a 25 foot run?