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Brightness is the result of a bump in the upper mids/lower treble. Any tweeter will emit this freqency range very wide without additional means to prevent it (wave guide, horn, ...). Woofers on the other hand beam in this range, whlch here leads to the directivity error.
Ah, ok, got it now. I was discounting the woofer response too much, incorrectly.

Thanks for your patient responses.

I'd be interested to see a proper spin of this speaker, showing also the summed response/expected in-room. We don't see that here.

I wonder if it's worth trying to do some measurements at the listening position -- I've been meaning to do this. WIll only apply to my room and have all the usual problems of not using a proper rig or anechoic chamber, but I've been meaning to do it anyway.
 
I wonder if it's worth trying to do some measurements at the listening position -- I've been meaning to do this. WIll only apply to my room and have all the usual problems of not using a proper rig or anechoic chamber, but I've been meaning to do it anyway.
Wonderfull idea Sir. It is more than I cold do, since I have no measurement equipment at all. I would be very eager to read about your results.
 
Wonderfull idea Sir. It is more than I cold do, since I have no measurement equipment at all. I would be very eager to read about your results.
Will update this thread when I do! But note it will not be of speakers but of the combined effect of room+speakers (+DSP).
 
Hello Folks.

I have added these two gizmos to complete my small humble "AV System".

The one on the left is FiiO BR13 BT receiver/DAC, priced at only 59 Euros (delivery included) from official german FiiO shop. Device connects and works reliably and not overly offending with relatively transparent Abacus C Boxes when I use it for podcasts and youtube videos. It does have coax and optical inputs, but since I do not stream music, I have not used them.

The one on the right is Abacus Linetreiber Variabel 2020, which is primarily a puristic preamp (developed with C Boxes in mind) and powerful headphone amp. It work nice with my power hungry Fostex T50RP 50th Anniversary planars and I use it for active volume control. Subjectively it sounds like my AV System has slightly better tonality and dynamics at very low listening levels and slightly better bass control at moderate levels: https://www.abacus-electronics.de/produkte/zubehor-diy/linetreiber/linetreiber-variabel-2020.html

Cheers.:)

IMG_5927 18.11.00.jpg
 
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