AVS Forum Special Member
Join Date: Sep 2000
Location: Los Angeles, CA
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I know the new trend is for mod shops to install 5.1 or 7.1 SPDIF outputs on BluRay players.
But what consumer gear actually inputs multichannel SPDIF? Let me be specific here, the Trinnov for example does not. It asks for AES, not SPDIF.
In the pro world, at least on the video side, I have never seen a device with multi SPDIF inputs. It's always AES.
My point is why don't these mod kits output true AES-3 which is still 75ohms unbalanced. Or if the majority of gear is 110ohms balanced, then supply that. The design of the interface circuits is the same, just a few component value changes, that of course assumes the SPDIF mods are transformer coupled. If not, then they are off to a bad start anyway.
I realize AES-3 and SPDIF are usually interchangeable, but there are voltage differences and sometimes that will bite you. SPDIF was intended for consumer single channel interconnection (2 analog channels). If these mod kits are touting superior performance, shouldn't they at least conform to proper electrical engineering standards in the interface? It's kind of silly how a lot of folks ooh and ahh over the Vanity to Trinnov combination yet the interface is kludged.
For what the Vanity costs, it wouldn't be that much more to add a compliant 25pin AES port as well.
And while your at it how about a dip switch or jumper to set the channel status bit between pro and consumer. This is easily implemented inside an FPGA architecture. My DIY AES BluRay mode has this.