Anyone know the weight limit for a 4x4 Kallax with undeframe?

Thanks @bdp24. Actually, the biggest reason I picked the Kallax over the EKET is because of the cube size. The EKET is 12-1/4” internally high while the Kallax is 13”. Some of my large box sets exceed 12-1/4” in height. 

Ah, the IKEA site does have weight information. According to them, for a 4x4 Kallax on legs, the weight limit per cube is 29 pounds.

Actually, the EKET's internal height is 12-3/4", as is the width of each cubicle. The depth is 13". I have a fair number of boxsets, which fit in the EKET just fine. The only ones too tall for it are the MoFi 1-Steps and Analogue Productions UHQR's, but those have the LP's themselves in normal-sized cardboard jackets. I store the over-sized boxes in a bookcase; even if those boxes fit, I wouldn't store the LP's in them anyway: too much work to get the LP out every time. ;-)

One thing you absolutely want to do with the Kallax is to set it up with the full-width panels horizontal; the 4 x 4 version can also be positioned such that those panels run vertically. Some Kallax owners have not noticed that structural design element, which has led to some catastrophic LP-loaded collapses! Some owners have added a back panel, which not only keeps dust out of each cubicle, but also provides some additional structural integrity.

That’s odd. IKEA’s drawing states it as 12-14”. 🤔

Typo. I meant to say 12-1/4”.

Yes, I do plan to add a back panel of some sort. Probably plywood.