My lab 5's werent lacking any bass i had to put it on -6 on my beosound 5 if i wanted to listen to them without anyone in my house and the neighboors complaining, but i noticed with some music that the bass doesnt respond so fast and that it is kind of slow huge let down :(

Tip #1 : reset the speakers to factory default

That's done by pressing the top the same way as when calibrating them, just keep it pressed til the speaker shuts it self off. usually 20 sec or so.

Tip #2: when calibrating them, place the speakers further from the back wall, if possible in the middle of the room even.

This usually yields far better bass response.

I have seen this comment before.  While I don't have a pair of Beolab 5's (though I hope to in the coming year), I have a theory as to why they are perceived to have a limited bass response (cue Anne Elk for you Monty Python fans).

In many speaker reviews, I've read of "room gain" in the bass response, e.g. the bass response rises in volume relative to the midrange response as result of boundary reinforcement.  Could it be that since that adjusted Beolab 5's account for this boundary reinforcement, they seem to have less bass response than a speaker that doesn't have that kind of adjustment?

The reviews of the Beolab 5's have frequency response graphs that definitely show it can produce a flat frequency response at the low end.

Yes, it is possible that the overall volume that you are listening to is too low.   The ear's frequency response varies with overall volume, especially at the low end.  I can provide a graph from a book if interested.

David

Eh hem...eh hem...eh hem...are you ready for my theory? Eh hem....

I think you're right, very few people, even audiophiles, have ever heard a setup with truly accurate, flat bass response. Usually there's a lot of not only freq domain bumps and serious dips but often time domain smearing from rooms that resonate, not just due to dimensions and standing waves but also structure that absorbs, resonates, and reradiates low frequencies. Not much you can do about cancellation dips but you can eq out bumps pretty successfully though you usually need a parametric eq that you can adjust for freq, Q, and amplitude. A lot of times I've seen and heard from others people don't like the results and say there's no bass. 

The times I've heard the Lab 5s I was blown away by the accuracy and depth of the bass. 

Thanks for the responses guys.

I was always under the impression the the BL 5's had to be powerlinked while the calibration was going. I've since found this out not to be the case. I'm going to a new calibration in the middle of my empty garage which hopefully will improve the bass response. Will let you know how it goes. Have a merry Xmas all. Cheers