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B&W 685


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#1 of 53 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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?

 

Posted Image

 

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 OFFLINE   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 OFFLINE   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 OFFLINE   Relic1Golf

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Posted July 01 2014 - 09:05 AM

is that an integrated amp or power amp?



#8 of 53 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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 OFFLINE   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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