Focal Aria 948

Josef Anton Hoffman, the 'H' in KLH was an audio engineer with a storied career that included working on the Manhattan Project in WWII, after which he returned to school at Harvard where he earned his PhD. In his career, he worked at KLH, AR, and Advent.

Hofmann's Iron Law
"There are three parameters that cannot all be had at the same time. They are low-bass reproduction, small (enclosure) size, and high (output) sensitivity." Hofmann stated that designers could pick two of these three parameters, but in doing so, it would compromise the third parameter.

The Focal Aria 948, with 92.5 dB sensitivity, gives up almost an octave of bass potential for that sensitivity. if were re-engineered to give up 3dB of sensitivity it could probably reclaim bass down to near 40 Hz. The best you can do is locate it closer to your rear walls to increase the acoustic loading. but that may have other tradeoffs you don't care for regarding soundstage and imaging. 

Amps like the Pioneer SX 1250, while measuring at 160 wpc had very low current… the real thing that supplies impact. High current designs did not start becoming common until the 1980’s and then only I expensive amp only components.

I’ve never heard the complaint the 948 had not sufficient bass extension but the opposite it was bass heavy. I had 906 for a while and they had excellent bass extension for the size, very room filling kind of bass. It was a little on the slow side but nice sounding speaker none the less just not very punchy. 

i have Aria 936 powered by Parasound A21+. I think you'll like JBL HDI-3800. I have gotten 3800s a few months ago (March 2023) and like them more than 936s. Specifically bass.

The Parasound A21+ is a hugely (!) more powerful amp than the Pioneer 1250.