Considering Harbeth C 7ES-3

The Super HL5plus is DEFINITELY not lacking in treble, either measurably or sonically.  It sounds open and airy.   The C7 didn't sound lacking to me either.
The 30.1 was a tad darker sounding than the two above, but still very nice.

Agreed, no lack of treble with the 7’s or SHL 5’s.

@avanti1960
FYI, the P3ESR and the C7 does not use a soft dome tweeter. It’s aluminum!

Harbeth P3ESR loudspeaker. The fundamental design of the P3ESR remains unchanged from its predecessor: a 0.75" (19mm) ferrofluid-cooled aluminum-dome tweeter, protected by a mesh screen (in this version, black instead of gold), is coupled to a 5" plastic-cone woofer, mounted on the front baffle from behind.

Harbeths only lack treble compared to speakers with a tipped-up, intentionally bright response - speakers designed to impress in quick auditions, Golden Ear Tritons for example.

Harbeth doesnt lack treble at all. I actually ended up selling the Shl5+ cause I found them slightly too present in the treble. but this is really my own personal taste, they were not bright, but definitely not dark either.

The 30.2 treble is more to my taste however and the Harbeth ill likely buy next