Bnc

zingo
zingo Posts: 11,258
edited August 2009 in Electronics
I am looking a getting a PC sound card and a DAC that both have BNC connectivity. I know that BNC is 75ohm for digital audio, but I once heard that it is the only true 75ohm connection for digital audio in the home. Is this true? Has anyone used a BNC connection before, and if so, did it sound any different than just digital coax or optical?
Jake
Post edited by zingo on
· Share on FacebookShare on Twitter

Comments

  • Systems
    Systems Posts: 14,873
    edited August 2009
    BNC's are the most common 75 ohm connector used for digital transmission and are considered the best for the purpose.In rare cases 75 ohm RCA's can be found(Canare makes some).Though not used for digtal audio F type connectors(cable tv) are 75 ohm aswell.(some BNC's like those used on test equipment are actually 50 ohm).Keeping the cable and terminations true 75 ohm's is benificial as it reduces reflections in the cable which should result in lower jitter.
    Testing
    Testing
    Testing
    · Share on FacebookShare on Twitter
  • zingo
    zingo Posts: 11,258
    edited August 2009
    Thanks Fred. Do you have any recommendations for BNC cables? Since it will be an audio cable, I'm sure not just any will do. :p
    Jake
    · Share on FacebookShare on Twitter
  • BlueFox
    BlueFox Posts: 15,251
    edited August 2009
    I had a custom BNC/RCA cable made by Blue Jeans cable to connect between my Wadia and basic Benchmark DAC1 (it doesn't have RCA connections). Anyways, it seems to work great for a hybrid. They can make you a BNC-BNC any length you want.
    Lumin X1 file player, Westminster Labs interconnect cable
    Sony XA-5400ES SACD; Pass XP-22 pre; X600.5 amps
    Magico S5 MKII Mcast Rose speakers; SPOD spikes

    Shunyata Triton v3/Typhon QR on source, Denali 2000 (2) on amps
    Shunyata Sigma XLR analog ICs, Sigma speaker cables
    Shunyata Sigma HC (2), Sigma Analog, Sigma Digital, Z Anaconda (3) power cables

    Mapleshade Samson V.3 four shelf solid maple rack, Micropoint brass footers
    Three 20 amp circuits.
    · Share on FacebookShare on Twitter
  • Systems
    Systems Posts: 14,873
    edited August 2009
    I like and use Canare's LV61S. http://www.canare.com/ProductItemDisplay.aspx?productItemID=75 You can make your own with a pair of these. http://www.canare.com/ProductItemDisplay.aspx?productItemID=30
    Sure it's not exotic but very hard to beat for price -performance ratio.
    Testing
    Testing
    Testing
    · Share on FacebookShare on Twitter
  • zingo
    zingo Posts: 11,258
    edited August 2009
    Blue Jeans is just down the street from me, so maybe I'll stop by. Do you guys think that going BNC would have a big advantage over the other digital connection means, AES/EBU included?
    Jake
    · Share on FacebookShare on Twitter
  • Systems
    Systems Posts: 14,873
    edited August 2009
    zingo wrote: »
    Blue Jeans is just down the street from me, so maybe I'll stop by.
    Thats convenient.
    Do you guys think that going BNC would have a big advantage over the other digital connection means, AES/EBU included?
    The balanced AES is good but you don't see it much anymore on consumer products.I prefer coax to optical and yes I think 75 ohm cable with BNC's at each end is ideal.As for the sonic differences (or lack of )between BNC and regular RCA termniations, that will be dependant on a number of things.eg.Like the jitter level output from the transport and the input reciever of the DAC's ability to reject it,the resolution of the system, hearing acuity etc.:)
    Testing
    Testing
    Testing
    · Share on FacebookShare on Twitter
  • zingo
    zingo Posts: 11,258
    edited August 2009
    Ya, I just emailed BJC so we'll see what they recommend for the conductor. I think I like that Canare cable and they carry it.
    Jake
    · Share on FacebookShare on Twitter