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Utilising the Quad 909's balanced inputs

Discussion in 'classic' started by mjwolf, Oct 29, 2017.

  1. mjwolf

    mjwolf Member

    Hi All,

    I recently bought a Quad 909 and an Audiolab 8200CD, and very pleased I am with them too. I'm currently using a Chord CrimsonPlus RCA interconnect between the two, but I note that the 8200CD has balanced XLR outputs, and the 909 balanced inputs, albeit via the ampbus socket. With that little preamble, I have a couple of questions:

    1. Does anyone have an idea s to how difficult/expensive it would be to make/have made a cable to connect the Audiolab XLR outputs to the Quad ampbus socket?

    and

    2. would it be worth the trouble? Obviously, this depends on the answer to the first question ;).

    Cheers.
     
  2. Barrymagrec

    Barrymagrec pfm Member

    1) Not difficult or expensive to make but you need to know the relevant pin numbering on the 15 way D connector. You could try the Dada electronics site.

    2) Probably not.
     
  3. calorgas

    calorgas pfm Member

    If it's any help:- when I had a 99 pre and 909 power, I couldn't hear any obvious difference whether they were connected via ampbus or rca.
     
  4. mjwolf

    mjwolf Member

    Thanks a lot for the help. Regarding whether or not it makes a difference, I've noticed some hissing through the speakers when the system's idle, which is apparently a common issue with the 8200CD and which can be mitigated by using the balanced outputs.
     
  5. abbydog

    abbydog pfm Member

    1, Join DADA Electronics site.
    2, Look up their Quad 77 schematic which has the pin outs for ‘quadlink’ D connectors. They are identical for 909 etc.
    3, buy dsub and xlrs plus a bit of starquad and make up a patch cable.
    4, you can then site power amp(s) next to speakers and run any length of balanced line between pre and power. This is quite handy. ISTR you can also daisy chain power amps. Lots of fun to be had.
     
  6. mjwolf

    mjwolf Member

    Thanks a lot for the detailed advice abbydog.
     
  7. Chris88

    Chris88 pfm Member

    The Quad 909's balanced signal is not genuine (not a native balanced signal), which means the signal has to be converted for the purpose and in this situation, actually creates an extra step in the conversion process. I would stick with RCA personally which will give you a more direct signal. Balanced can often be better, but not in the case of the Quad 909 (unfortunately).
     
  8. Julf

    Julf Evil brother of Mark V Shaney

    What "conversion process" is that? An additional transistor?
     
  9. Arkless Electronics

    Arkless Electronics Trade: Arkless

    Spot on yes.
     
  10. Arkless Electronics

    Arkless Electronics Trade: Arkless

    I guess every time this topic comes up Julf will say this... and I'll come along and say he is 100% wrong and to ignore him.
     
  11. Barrymagrec

    Barrymagrec pfm Member

    This is analogue electronics, neither is 100% wrong or 100% right, you are just biased differently.
     
  12. Julf

    Julf Evil brother of Mark V Shaney

    The difference is that I tend to explain my rationale, and you tend to go "because I say so".
     
  13. Julf

    Julf Evil brother of Mark V Shaney

    That is the fundamental problem with analog! :)
     
  14. JensenHealey

    JensenHealey pfm Member

    If your Audiolab and Quad are a couple of miles apart (well, a long way, like 10M or more), in an noisy electrical / RF environment, or there are some hum issues, then balanced might make sense. Otherwise I do not believe you will hear the difference even if, in theory, balanced is a 'better' option.
     
  15. misterdog

    misterdog Not the canine kind

    Or watch this video showing the difference in 'noise' pick up between starquad and non starquad balanced cables.

    It shows the noise pick up from a PC and an embedded transformer, so just a normal domestic environment.

    Shame he did not include an ordinary RCA cable in the test, but note both cables are shielded.



    https://www.designacable.com/ should be able to make an interconnect for you, and at considerably less cost than a 'domestic audio' cable.
     
  16. Arkless Electronics

    Arkless Electronics Trade: Arkless

    I agree yes.
     
  17. mjwolf

    mjwolf Member

    Thanks. As I mentioned in a subsequent post, the problem that I'm experiencing (which I hadn't noticed when I started the thread) is hissing when there's no signal coming from the 8200CD. According to posts I've read on other forums, this is apparently a known issue when feeding from the RCA outputs of the 8200CD into a high sensitivity amp such as the 909, and one which is mitigated when using the balanced outputs.
     
  18. mjwolf

    mjwolf Member

    Thanks for the tip. I'll take a look at that website.
     

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