I am a user of ESL Speakers, Floor Standing 3 x Driver Ported Cabinet Speakers and a Single Full Range Driver Transmission Line Design for the Cabinet.
The Floor Standing 3 x Driver Ported Cabinet Speakers, in comparison are the most coloured out of the selection, but compared to other Speakers sharing similar Cabinet Design, these are quite uncoloured as the comparison outcome, and are many many steps closer to what the ESL can create, than other Ported Cabinet experienced designs used in the home system have been capable of.
Ported Cabinet Designs seemingly need substantial Cabinet Structures to tame the energies that effect the End Sound produced. The owned Ported Speakers requires 2 x People to handle, where risk of injury or damaging a Speaker is best managed.
Designs of Speaker and Sensitivity of Speaker will limit partnering devices to drive them. My Speakers range between 83dB - 106dB which is woefully inefficient to uber efficient.
The 83dB speakers are not usually receiving more than 20 Watts Power from an Amp, which is to change as a 60 Watt SS Amp' is loaned and awaiting its use. The TL's are 106dB Speakers and receiving 5 Watts as the lowest.
I have not got a prejudice or bias against any of the End Sounds that are being produced.
The Link between 8 minutes - 12 minutes might offer a description that helps explain why such differences to designs are able to create a Parity Impression, when End Sound is being evaluated.