I have a very similar setup currently.  I have this: http://www.anthemav.com/products/anthem-statement/processor/d-2v  as my A/V processor connected to Beolab 5 fronts and 3s in the rear.  That Onkyo looks very similar

The speakers connect to the preouts on the processor.  I do not think you can use the balanced outs because of the voltage.  The lab 5s are connected simply using regular RCA cable to the line in on the lab 5s.  For the 3s, you would need an RCA to powerlink cable which are readily availiable.  I got mine from Sounds Heavenly off this website. 

The lab 3s will power on automatically once they get a line in signal from the processor.  The 5s are a little more complex.  You will need to turn them on using a B&O remote, then they will simply play once they get a signal.  You also have to change option settings on the lab 5s which is easy enough to do. 

You will need to set the proper volume on the Beolab 5s as well.  You would use the test tone feature on the processor and make sure all of the tones are the same volume. 

It's all easy to do but it took some research on my part to get it done.  It's an awesome setup, movies sound better than the theater!  Music using a good surround mode is enveloping.  There is some good info buried in the forums here as well on doing this.

Hope this helps

Oh, and furthermore,

When setting up the speaker configurations on the processor, you would set the lab 5s to "large" and the lab 3s to "small".  You would select "none" for center and subwoofer.  The phantom center channel using the lab 5s is very good although I am contemplating getting a center channel.  The subwoofers in the lab 5s are simply awesome. 

If the processor has some kind of bass management setup, skip it.  Use the calibration feature on the Beolab 5s instead.

Hi beoinbuff

Thanks for the quick reponse and for sharing your knowledge with me - very much appreciated!

Regarding the RCA --> Line Cables, can I not connect it via Digital Out to the AV receiver instead of LINE?

Also will I need to "syncr" cable at all? Or is that only necessary if I use the digital out instead of LINE? Suppose I would also have to purchase this seperately.

It's a shame the Beolab 5's have to be turned on by their own remote, just introduces more remotes :( I was hoping there was a way to get the BL5's to turn on automatically like the BL3's.

Have read a lot of good words about Sounds Heavenly here on the forum! If I ever needed any more cables in the future I will be sure to give him a shout, however the B&O dealer offered to provide me with the cables I need for now when they ship the speakers.

P.S. Getting a bit OT, what center speaker will you be looking at? BeoLab 7-1/7-2/7-6? Do they work with non B&O receiver/tv? 😁

I have an Onkyo, connected to BL 8000 front, BL 4000 center, and 2 non coms passive as surround, works like a charm, I used the automatic calibration on the Onkyo, but as you use BL 5s you can set it yourself. BLs are connected to the preouts and the passives to the amped.

Thanks for confirming :) Looking forward to setting this up once I find out the right cables I need and if there is any way to power the BL5's on with the AV Receiver :)

There is one point that I dont like with my Onkyo.

The preouts are, 270 mV/470 Ohms, this means that I cant drive my BLs to full volume, its good enough for my dayly use but I cant get the volume up to where the windows starts vibrating, Wtih my Beosound 3000 they go way higher to the limit where the protection circuit in the BL 8000 kick in (lowers the bass level), so if you did not buy your Onkyo yet, think about it.

Once in a while I play some Rock to get my brain blowed out, I do that on my BM 4000 with S45 and Bvox 3000 panels. I cant do that with the 8000/Onkyo

Hmm thanks for bringing that up! It just made me reconsider my decision. Was quite set on the Onkyo PR-SC5509.

However, I see the following specs on the data sheet for that particular receiver:

Maximum RCA Output Level and Impedance
5.5 V/470 Ω (Pre out)

Does the 5.5V mean I will be able to drive them to full volume? Which figure am I looking at for my BL5's to drive them hard enough (full?) ?

Thanks once again!

As the 5509 has 1 to 5.5 V  on the preouts, there should be no problem, the 708 has only 270 mV to 4.5 V  . So I think it should be OK.

Audiophiles looks for at least 1 V in the preouts, I dont know to much about it and why, but thats what I've found reading, also several users with amps with preouts with 1 V has no problems driving big Klimsch and simular aktive speakers.

So dont dont kill me if it doesn't work 😂

 Haha don't worry! No one to blame but myself 😎

I just thought/expected for the price of that particular receiver that it would be able to drive the BL5's to full capacity! Hopefully what you say is right :)

Maybe some of the more knowledgable members will be able to enlighten us!

Need to make my decision by Monday as the BL's are getting shipped on Tuesday, so I'm hoping to inlcude them in the same shipment.

Thanks!!

P.S. Seriously considering getting the dealer to add a BL7-2 in the shipment for center speaker to complete the setup!