That sale is ongoing for the 926/936 too btw. Problem with store auditioning is: it's not my room. and I won't have my exact front-end gear at my disposal, nor will the sub and speakers be matched using dirac (if there is a sub at my disposal at all). You make a valid point, but in my mind it's nearly impossible to create the conditions where I would be satisfied that the comparison is "valid".
Is your advice on the sub 1000 F based on some experience you had with them? Or if you have measurements at your disposal, please do share because I couldn't find anything online. The reviews that I did find praised it for its precision and accuracy. Maybe I should "distrust" the sub in advance (which I haven't heard either) and just get the 936, giving the sub less work to do? Although I would be surprised Focal are no good at designing them. For one, they have many subs: for cars, home theater and hifi at different price points. I'm not fully on board with that metaphor. If tower speakers are cars, then subs might be more like motorbikes rather than bikes. Which BMW definitely makes quite well, despite any challenge harley davidson might pose
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But as I already said: due to the looks (which is something my partner gets a say in) it's gonna be 1000 F or no sub. The aria's themselves (mainly due to the light color and material of the flax drivers) have quite an impact on the look of the family room. Throwing in something like SVS or REL is too much of a challenge for her and, even though I could get over it myself, I get it.