Focal Aria 948

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. 

I have 936’s (6” woofers vs 8” in your 948’s) and the bass is outstanding. Please note that the impedance curve drops below 3 ohms in the mid bass region. With a PrimaLuna integrated and a Mac MA352, I’ve enjoyed those speakers immensely. I even drove them with a vintage Sansui AU717 with excellent bass. An alternative might be Revel f208’s…similar price point.