@drubin ATC are voiced for realistic live music levels. So turned down to levels of a TV or a radio and they will sound anemic in bass (see equal loudness curves). You can of course simply boost the bass at low levels and it will sound great.
https://en.m.wikipedia.org/wiki/Equal-loudness_contourATC bass is not resonant like some ported designs and this means bass will not be boosted or bloated even when cranked.
ATC help sound engineers design the mixing to sound good at a loudness level that suits the music. Obviously the normal loudness listening level is different for various genres. Anything intended to be listened to at moderate to low levels needs a bass boost and anything intended to be listened to at Rock highest levels needs to have less bass.
If you always listen moderately or softly then much of the benefit of ATC massive drivers (that are low distortion even at high SPL) is going to be wasted or remain unused. Our ears can handle a huge dynamic range and much of the detail can only be entirely heard at realistic levels. If you play at a maximum of 80 dB SPL at the listener then you have around a max of 40 to 50 dB dynamic range audibly available above the noise floor. If you play such that the highest sounds are 110 dB SPL then you have an additional 30 dB of audible detail that was not available at low listening levels. It is key to understand that by cranking it you are able to hear a further 30 dB below the noise floor at a soft level and only a very robust over-engineered design of speaker can deliver this. Large ATC are like 70 dB down in 2nd and third harmonic distortion throughout the mid range - this is very clean and this is why the SCM 40 will sound clearer than the 19 which has the 3 inch mid grafted onto a 6 inch woofer.