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Bi-wire using A + B Outputs?

Discussion in 'Home Cinema Speakers' started by AndyDD, Oct 20, 2003.

  1. AndyDD

    AndyDD
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    Newbie type question...
    I want to try bi-wiring my front speakers to see for myself if there is an improvement. I have enough spare cable to do this.

    My current amp is a Sony DB830. This has Front A (L/R), and Front B (L/R) outputs. Also have a switch to select A, B, or A+B.

    Should I connect each of the two sets to a single A, or use the A and B outputs for each crossover? The speakers are 773s.
     
  2. NinjaKi11a

    NinjaKi11a
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    I use both A+B outputs for bi-wiring on my NAD C370. Minor nuisance is that when you turn it on, it defaults to A alone. Having said that, I've gotten into the habit of leaving everything on, so it's no big deal.
     
  3. Reiner

    Reiner
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    Either will do, A and B perhaps is easier since you won't need to squezze two cables into one terminal.
     
  4. AndyDD

    AndyDD
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    Managed to get some banana plugs from work, cut my spare cable (some cheapish QED stuff) to the same lengths....
    I had a good listen to some Groove Armada. Added the extra set of cables and listened again to the same music.

    Wow!!!

    No difference :blush:

    I can understand the theory why it might work.
     
  5. Radioactive__Man

    Radioactive__Man
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    on the basis that you really didn't hear any difference, did you remove the link wire/plate from the speaker terminals 1st ?

    apologies if you already did the obvious:lesson:
     
  6. mr_blah

    mr_blah
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    Could the same idea work for a Center speaker using A+B instead of just using A?
     
  7. AndyDD

    AndyDD
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    I indeed removed the shorting plates. It is possible that my amp isn't of enough quality to show the benefits. I'm running a Denon 2900, with the 6 analogue inputs using QED 2's 0.5 metre interconnects so my source should be OK. I wasn't really upset with the CD strereo quality anyway, although using the digital input is a bit better. My other speakers aren't bi-wirable but I've run out of spare cable anyway.
    I'm trying to decide between a Pioneer AX3 or a Denon 3803, but that's another thread :)
     
  8. NinjaKi11a

    NinjaKi11a
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    Personally I haven't heard my system with anything but biwire, but I don't think you'd be the first to say they can't tell the difference. ;)
     
  9. YS-YS

    YS-YS
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    no there is really no arguement to bi-wire, and for a true bi-wire you, take out the bridge on the speakers. then connect both pairs of wires to the same connector on the amp, either the A or the B.
     
  10. Ian J

    Ian J
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    Biwiring has as many detractors as it has supporters so please don't state your opinions as if they were facts.
     
  11. pwiles1968

    pwiles1968
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    On most amplifiers the A/B switch simply parallels up the speaker outputs so in fact you are actually using the same connector just inside the amp.:rolleyes:

    IMO bi-wiring is more dependant on the speakers than the amp, I found my 603’s a bit sibilant with some music Bi-Wiring solved this, they are now bi-amplified now that was a difference. :smashin:
     
  12. YS-YS

    YS-YS
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    yes some amps are like that. :rolleyes: but not all.

    Ian J - would you care to show me an argument that stands up.
    if so I will never post such a statement about bi-wireing on any forum again.

    over to you.
    YS-YS
     
  13. Ian J

    Ian J
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    There is only one valid argument and that is people's ears and as there are a great many people that state that biwiring makes no different, your bald statement that "no there is really no arguement to bi-wire" is patently untrue. There are many threads within this forum (and others) about the subject including one here and another here
     
  14. YS-YS

    YS-YS
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    I accept you cannot tell people what they hear, but for all of you watching I ask for you to try blind tests, knowing there is a difference and trying to find one will always succeed. but if you dont know what the speakers are wired up with that would be the real test.
     
  15. pwiles1968

    pwiles1968
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    Yes I know, some of them have separate amplifiers for A & B, in which case you would be Bi-Amplifying the speakers, BONUS. :D.

    I trust my ears and I felt Bi Wiring helped with my B&W's. Not saying it would help with all speakers and it may just have been the reduction in impedance but IMO there was a difference.
     
  16. Reiner

    Reiner
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    If you have a Center A and B out (some e.g. Yamahas do) and the speaker can be bi-wired/amped, then yes.
     
  17. mr_blah

    mr_blah
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    Yeah thanks, i have a yamaha DSP A1 - soon to be Z9 :)

    So the Center KEF TDM23c will be getting hooked upto A+B then, even if its not a bi-wire speaker.
     
  18. Reiner

    Reiner
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    Why would you want to do this then? Doesn't make sense IMO ...
     
  19. mr_blah

    mr_blah
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    Well i don't see the harm, but have had the KEF Q75's bi-wired (now tdm23f) from the amp cause the q75's allowed this and to keep all the speaker cabling same lenths and amount, i left the center speaker like the ex-main fronts bi-wired, yes i know it really needs a amp that can do this, so it isnt about cost or a waste, but it might make a difference.
     
  20. Reiner

    Reiner
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    No harm but effectively you are doubling the diameter of the speaker cable, so there should be a difference - most likely more bass (not necessarily "better" bass).
     

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