A and B speaker question??

Discussion in 'Archived Threads 2001-2004' started by Marcel Saring, Jan 3, 2002.

  1. Marcel Saring

    Marcel Saring Auditioning

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    My question is that can I Bi-amp my mains using A and B speakers on my Yamaha 795a receiver?

    I have Energy e-XL 26 for mains that I would like to try to Bi-amp.

    Can I do this safely??

    Thank you in advance
     
  2. Marc Rochkind

    Marc Rochkind Second Unit

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    I doubt that this would be bi-amping, as it's likely that A and B are simply two connections to the same amp, although I'm not actually familiar with this particular receiver.

    Perhaps you meant bi-wiring. In that case, most likely using A + B would be the same as connecting both pairs to just A or just B.

    This is only a guess...

    As to whether bi-wiring is worthwhile, well... that's a whole thread or two or three in itself!
     
  3. Marcel Saring

    Marcel Saring Auditioning

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  4. Jim_Stu

    Jim_Stu Stunt Coordinator

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    Marcel,

    I don't know if 'bi-amping' has changed in the last decade

    of not. However, in the old (1970s) days, it was the practice

    of using 2 or 3 amplifiers/channel with 'active' crossover devices (filters),

    located at in the main chassis. Usually the amps

    were of different wattages. The lower wattage would be

    connected to 'tweeter/mid-range array' and the higher

    wattage unit connected to the 'bass array'.

    On today's receivers The 'A' and 'B' main outputs are usually not just parallel

    connected. They are transformer or R/C isolated from each other,

    to avoid impedance miss-match. However, they are usually connected

    to the same amplifier through a switching circuit. The only pitfall, I see,

    for your idea is how to perform the 'crossover'signal filtering.

    Furthermore, it might be said that through the use of the 'powered sub' in todays HT

    set-ups, we are bi-amping.

    old..
     
  5. Marcel Saring

    Marcel Saring Auditioning

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    Thanks Jim!!
    So in other words I need to have a separate high pass filter and low pass filter to do this?
    O well just a thought.[​IMG]
     
  6. Martin Rendall

    Martin Rendall Screenwriter

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    Er, I'm just a novice, but I understood from my bi-amp'able speaker manual that the speaker has a passive crossover built in, which can't be circumvented. That means than an external active crossover shouldn't be used. As for the receiver, I have no idea. I've toyed with the idea myself, but (again) my speaker manual explicitly recommends not doing this.

    Martin.
     
  7. Thomas_A

    Thomas_A Second Unit

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    I have the 795a...and found out that I realy heard no difference myself by using the A/B on bi-amping the speaker. The difference I found was suing a speaker set on each a/b and sounds great! My amp does not even get warm..but then..there is a switch on the back..

    good luck..thomas a.
     
  8. Marcel Saring

    Marcel Saring Auditioning

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    Thomas,

    I'm at a lose as to what who have said?

    So you Bi-wired your speakers, Highs to A and B to low or vice/versa.

    What I'm confused about is in the Quote below .

     
  9. Brian P

    Brian P Extra

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    Doesn't the high/low pass filters need to be before the amps? I mean isnt that the purpose of bi-amping to remove the opposite frequency from each amp. Otherwise you do increase total power but its not much different than bi-wireing.
     
  10. Thomas_A

    Thomas_A Second Unit

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    Marcel.. My polks are bi-ampable speakers... they have two post sets on the back.. at one time I had a wired to highs and b wired to low inputs...I found realy no difference doing this... you may.. all equipement varies...

    What I have now..are my 2000i's running on A and my rt55i's running on B... my posts are bridged on the speakers..so I'm running each set normal... hope that clears it up.
     

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