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B&W 685


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#1 of 53 Relic1Golf

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Posted June 29 2014 - 12:12 PM

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 of 53 schan1269

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Posted June 29 2014 - 01:25 PM

Wait, you have 120...and only want 40-60?

Confused.

#3 of 53 Relic1Golf

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Posted June 30 2014 - 10:56 AM

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 of 53 John Garcia

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Posted June 30 2014 - 11:38 AM

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?

 

x033AV3805B-b.jpeg

 

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.


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#5 of 53 Relic1Golf

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Posted June 30 2014 - 08:38 PM

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 of 53 schan1269

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Posted July 01 2014 - 06:51 AM

I'm a fan of older Nikko, Hafler and SAE.

#7 of 53 Relic1Golf

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Posted July 01 2014 - 09:05 AM

is that an integrated amp or power amp?



#8 of 53 Relic1Golf

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Posted July 06 2014 - 10:57 AM

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 of 53 gene c

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Posted July 06 2014 - 11:06 AM

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.


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#10 of 53 Relic1Golf

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Posted July 06 2014 - 12:36 PM

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 of 53 schan1269

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Posted July 06 2014 - 12:46 PM

If you want a lean bite sound, find a NAD PE(Power Envelope).

If you don't like it, resell it.

#12 of 53 Relic1Golf

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Posted July 06 2014 - 01:31 PM

If you want a lean bite sound, find a NAD PE(Power Envelope).

If you don't like it, resell it.

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



#13 of 53 schan1269

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Posted July 06 2014 - 02:54 PM

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

#14 of 53 Relic1Golf

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Posted July 06 2014 - 08:00 PM

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



#15 of 53 Relic1Golf

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Posted July 08 2014 - 10:58 AM

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 of 53 John Garcia

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Posted July 10 2014 - 09:43 AM

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


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#17 of 53 schan1269

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Posted July 10 2014 - 10:28 AM

Bridgeable has nothing to do, at all, with bi-wire.

#18 of 53 Relic1Golf

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Posted July 11 2014 - 06:46 PM

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 of 53 John Garcia

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Posted July 11 2014 - 08:35 PM

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.


HT: Emotiva UMC-200, Emotiva XPA-3, Carnegie Acoustics CSB-1s + CSC-1, GR Research A/V-1s, Epik Empire, Oppo BDP-105, PS4, PS3,URC R-50, APC-H10, Panamax 5100 Bluejeans Cable
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#20 of 53 Relic1Golf

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Posted July 17 2014 - 06:46 PM

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




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