No bass leanness in my room or another Gibbon X owner's that I know well.
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I have not heard them. You can stop reading there, if you want.
Any speaker whose woofer is far off the floor will be subject to floor-bounce cancellation, which typically occurs in the 100-300 Hz range. This can cause leanness and necessitates careful positioning, which still can’t always overcome it.
That effect is very much in evidence in Fig. 3 of the Stereophile review. One thing one should be aware of is that JA1 is really, really good at positioning speakers for best response. (His graphs often compare response in the reviewer’s room to his, and he always gets a better result.)
Some people like a suckout in this range, as it adds perceived "clarity" and "tightness." I for one do not like it. My advice is, listen carefully before writing any nonrefundable check.
I auditioned them 18 months ago with Sugden amp/pre and Line Magnetic CD player and Audience wire. Huge bloom with excellent mids/highs. But, the bass integration left me wanting, a lot. I had high hopes because I wanted a speaker with some efficiency. Had to walk away from that. I think I read the review you mention. Nevertheless, I didn't like the speaker because of the bottom end. The rest was very convincing. If you put this speaker in contention, you owe it to yourself to go and hear them. Then have the dealer place them in your room to see if they will actually work. They are not an inexpensive proposition.
The Gibbons are an excellent speaker with a lot of attibutes but they have never been a very bass heavy speaker.
At the price point there are a ton of great loudspeakers that will offer similar attributes with far deeper bass.
If you are stuck on the Gibbons consider a good fast subwoofer like a Rel or look at other speakers.
Dave and Troy
Audio Doctor NJ
Actually, the Gibbon X is quite a bass heavy speaker. Read for instance the review at parttimeaudiophile.
I auditioned the Gibbon X in what was a pretty generous sized space and found the bass region very deep but unfortunately over-bearing. Just too much. Wheres in the same space the O/96 speakers sounded rich but pretty well controlled in the bass. The Gibbon X's bass response left me with the impression it would be one of the trickier speakers to integrate in to a room (especially one that wasn't large).
The mids and soundstaging were very nice though. Clear and warm-toned, with I think a bit of that upper bass/lower mid leaness.