Thanks a lot guys for verifing this, that I shall do.

Obtaing another pair of BL3 and 4 Receivers...sucks they are nowhere available.

Corona

Get the Receiver 1's while you can.
I had to wait 3 months on mine.

I am in Switzerland, they are not available by any B&O Dealer.

I have just installed 2 bl3 as the rear speakers.  They are bearly noticable in the background-question with 2 additional bl3 will it be any benefit to the surround system?

I did set them up as rear speakers, they play back right sounds also leveling was not an issue as b&o suggested.

No I don't think we're talking about the same thing. In the TV you can set DB levels, take out your phone with any DB meter app, turn the volume on the TV to what you usually listen at and make the output DB level between all speakers the same.

Also in a 5.1 setup your ''rear'' speakers should be set to surround. 

To get the full effect of them use something like the trailer of 6 underground on Netflix and see if they give you the effects desired. There are a ton of settings you can change to tweak it, also make sure you're in the movie preset for sound.

Does that make sense?

The bl5 were already calibrated by the B&O. Do the bl3 also need to be calibrated same way?

I have an eclipse with 4x BL3 and a BL19 as sub and I like that set up very much. Very small footprint of the BL3 but still very capable. 

I agree with others that no need for sub if you have the BL5. If you can find more BL3's go for them. I personally think they are extremely good value, certainly if you have the BL5 to take care of bass. BL3 are perfect surround speakers.

One of my BL3 just blew. I can't find a replacement yet. Any recommendations what I should replace them with with new line up of speakers? I would move the working BL3 as surround. What would you suggest for front? BL18 with the BL19 or BL28? Anything else?