As discussed in the
T301 review thread, this is specifically tuned for wall placement, and the
floor stand they provide has a signal path with a passive filter in it to correct the response for free-standing.
Using it as free-standing without that filter is not the design intent.
Although my educated guess is that filter is probably only a shelf filter lowering stuff above the midrange by 3-6dB, similar to the "band 3" Amir applied.
The other spikes (which may be intentional anti-SBIR for wall mounting) would probably remain.
KEF's explanation about their own Selecta-mount is conflicting and confusing:
https://us.kef.com/explore-kef/kef-innovation/selecta-mount
Here it shows KHT9000 measurements comparing free space placement away from walls (say, flat) and on-wall (with obvious bass-boost and comb-effect). Then, there are KHT9000 measurements comparing free space, and on-wall with Selecta-mount, where bass is shelved down (
with high-pass filter integrated in on-wall Selecta-mount), to match free space measurements. But, the T-series of loudspeakers are not mentioned at all and there are no T101 or T301(C) measurements with and without Selecta-mount intended for T-series loudspeakers.
On the other hand, in their T-series brochure:
https://www.shop.us.kef.com/pub/media/wysiwyg/documents/tseries/t_tech_explained.pdf
on the page 8 there is an explanation "...when they
(T-series) are used on the floor stand ... the KEF Selecta-mount system automatically adjusts the balance", with see-through rendered image of the
floor-stand Selecta-mount, exposing parts which looks like a cored inductor and a ceramic resistor. It resembles a
low-pass filter for baffle step compensation (parallel L
CR, in series with the loudspeaker).
This Selecta-mount low-pass filter will not help T101 much, because there is a huge peak at 850Hz and massive dip around 1.5kHz, which can not be corrected with a simple L
CR filter. Likewise, it will not help T301 either. It seems the problem is inherent to the midbass driver. Interestingly, T101 speakers don't have those bad resonances around 1kHz as T301 have.
I was under the wrong impression that all Selecta-mounts have the same high-pass type of filter built-in, but clearly only the name Selecta-mount is the same. KHT9000
on-wall Selecta-mount contains
high-pass filter, and T-series
floor-stand Selecta-mount contains
low-pass filter. So,
@KMO was right in his post #64 in the T301 review thread, and I stand corrected. As a man of honour, I apologize to
@KMO.
Edit: LR, not LC.