Hi to all,

I would like to connect my Waveterminal 192X soundcard digital electric output (Cinch) wirelessly to the digital electric input (Cinch) of my amplifier (Shanling SLM-A40MKII). The distance is about 6 m and no obstacles are in between. It should be a high performance transmission without any losses (if possible).

Does anybody know the (second) best solution? (I know, the best solution is digital koax cable, but if I go along the walls, the cable has about 12 m which is probably too long for this connection).

Thanks for your advice



Martin

I guess you'd loose much more with a wireless transmission as with a well-shielded coax cable. Because of the high frequency there's energy emission, I know. Use a high end coax cable. (You'd need EUR 50 or so, I fear) I've never heard of a wireless spidf transmission.
Edit: Don't you have optical in/out ? Then the distance won't matter.

I've read you can use a wireless home video transmitter/receiver system to transmit SPDIF wirelessly. Haven't personally done it or seen it done but you may want to investigate it.

I have about 15m of standard co-ax going from a Soundblaster Live output card to a Cambridge Audio IsoMagic DAC - never had any problems.

I think the transmission range for an optical SP/DIF connection is less than a good quality electrical connection. The inexpensive diodes used in optical SP/DIF operate at a different frequency to the communication lasers that light multi-kilometre transatlantic communication fibres etc. The light absorbency is actually quite high. Optical is useful in environments with high levels of electrical interference.

I would try a good quality 75 ohm co-ax cable (from a DIY shop, not a hifi shop!) before doing anything more complicated.

I run about 30 feet of coax.Got it free from my cable provider and bought the appropriate gold plated interconnects from Radio Shack.

Never a glitch that I can detect. Sounds great.

FWIW

Hardwire is the way to go...but a good quality video sender/receiver as mentioned by DigitalMan should work well. Audio sp/dif doesn't come even remotely close to the demands imposed by video.

xen-uno

tank you very much for your replies!

Still one question remains: Can anybody give me some links of manufacturers/resellers of such video senders?

Thanks


Martin

try...

http://www.crutchfield.com/

...or do a google on video senders

I think the light's actual frequency is not the point. spdif uses red ~680nm, if I remember correctly.
But: spidf uses no lasers at all, it would be far too dangerous, just normal diodes. One can look at the nice red light coming out of the back of the DAT, MD etc. without harm.
Lasers produce light-waves that are all in phase !



I never understood what this 75ohm means.
Once I bought an expensive cable identified as a "digital electrical spdif cable" with a single wire, not like the normal chinch cables. I has no resistance (at least no real ohm-like resistance, if you know what I mean).
This 75ohm refers to the cables used for antenna, they have different plugs but in principle the same structure. They also don't have a resistance.

???????????????

It is the characteristic impedance of the cable.
If you put a resistance of this value at the end of the cable, from the other side, you see an infinite cable ! The cable terminated by the resistance, electrically, behaves exactly the same way as if it has no other end. The useful thing is that you don't get any reflexion of the electromagnetic signal at the end of the cable, thus no internal stationary waves.

Anyway, it's not important for SPDIF, since CINCH (RCA) plugs have a characteristic impedance of about 50 Ohm. To do things well, you'd have to use 75 Ohm calibrated BNC plugs. Some audiophile drives and DACs feature BNC plugs instead of CINCH.

Or maybe get some 50ohm cable

Here is a neat tutorial on characteristic impedance.