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B&W 685

Discussion in 'Speakers' started by Relic1Golf, Jun 29, 2014.

  1. Relic1Golf

    Relic1Golf Well-Known Member

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    its been awhile, I finally bought a pair of B&W 685 bookshelf speakes for front L/R. I have a Denon AVR3805 receiver with no pre-out I can find, its rated at 120wpc but I wanted to get a integrated amp or 2ch power amp for the 685s. how would I connect the amp to the receiver and would anyone recommend a sufficent amp rated at 40-60w for those speakers?
     
  2. schan1269

    schan1269 HTF Expert
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    Wait, you have 120...and only want 40-60?Confused.
     
  3. Relic1Golf

    Relic1Golf Well-Known Member

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    with an A or A/B power amp you would have good clean power. much like a SET amp rated at a only a few watts, its only 20w but it cleans up the signal path and with a speaker rated at 90-95db for efficiency you are getting 95db@1watt. you dont need 5000w to sound good. granted the B&W speakers are rated at 88db so they are not all that efficient, but any speaker could benefit from a dedicated amp.
     
  4. John Garcia

    John Garcia Well-Known Member

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    The 3805 most definitely has preamp outputs right next to the power connector and labeled PRE OUT. Have you already tried these speakers with this receiver?

    [​IMG]

    As to an amp or integrated, kind of need a price range to give suggestions, since recommendations could be very different for differen price ranges.
     
  5. Relic1Golf

    Relic1Golf Well-Known Member

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    Oh shit, I didn't even see those. I have my subwoofer connected and I looked right past them. As far as price, probably 600-$1000. I was looking at an integrated amp but I figured I wouldn't need one if I could use the master controls off the receiver.
     
  6. schan1269

    schan1269 HTF Expert
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    I'm a fan of older Nikko, Hafler and SAE.
     
  7. Relic1Golf

    Relic1Golf Well-Known Member

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    is that an integrated amp or power amp?
     
  8. Relic1Golf

    Relic1Golf Well-Known Member

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    would I be able to get away with a power amp or do I need the secondary controls from a pre-amp or integrated amp?
     
  9. gene c

    gene c Well-Known Member

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    If you're using the Pre-Outs on the receiver then you only need a power amp. The receiver would act just like a Pre-Amp.

    Some of us feel a dedicated stereo analog pre-amp is better then a receiver for stereo music. Some don't.
     
  10. Relic1Golf

    Relic1Golf Well-Known Member

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    thank you all for the replies. I will keep looking for either an A/B solid state or tube amp, I will keep you all posted on what I find.
     
  11. schan1269

    schan1269 HTF Expert
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    If you want a lean bite sound, find a NAD PE(Power Envelope).If you don't like it, resell it.
     
  12. Relic1Golf

    Relic1Golf Well-Known Member

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    I think Planz sells NAD products, I will check with them to see if its available.
     
  13. schan1269

    schan1269 HTF Expert
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    PE isn't an "it". It is a feature found in amps they made for 15 some years.
     
  14. Relic1Golf

    Relic1Golf Well-Known Member

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    Oh I see I'll have to check it out, the feature I mean.
     
  15. Relic1Golf

    Relic1Golf Well-Known Member

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    I was reading a review about the NAD 245BEEE that is a 4ch bridgeable amp. the B&W 685 speakers have 4 binding posts for bi-wire setup, would I have any benefit connecting a 4ch amp in bi-wire setup or just get a 2ch amp and connect it normally?
     
  16. John Garcia

    John Garcia Well-Known Member

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    Connect it normally. Rather than Biamp, you're better off just getting a big enough amp for your tastes.
     
  17. schan1269

    schan1269 HTF Expert
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    Bridgeable has nothing to do, at all, with bi-wire.
     
  18. Relic1Golf

    Relic1Golf Well-Known Member

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    I know but I didn't know if it would work for bi-wiring. It's a 4ch amp you could also bridge into 2.
     
  19. John Garcia

    John Garcia Well-Known Member

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    I've biamped bookshelf speakers before and can't say they benefitted from it. It might be more of a benefit with a very power hungry speaker like a 4 Ohm tower that is demanding, but I doubt the 685s at 87dB sensitivity and -3dB of approximately 52hz, I don't think they'll require it. Since they're listed as 8 Ohm, you might be OK running that amp bridged with them because the amp would most likley be limited to 8 Ohms when bridged.
     
  20. Relic1Golf

    Relic1Golf Well-Known Member

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    Has anyone given Rotel a/b power amps a chance, how well would it pair with bookshelf speakers?
     

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