Here is a dual LJM L25d stereo along with subwoofer AUD550. Has discrete preamp for tone control and a subwoofer "extractor" PCB. Level VU METERS. It uses toroids for power amps. The subwoofer amp AUD550 has rectifier and filter on board. That module also has a speaker protection relay circuit on board. The L25d modules share a separate rectifier filter PCB and speaker protection PCB.
Ended up being my favorite one so far! Use it everyday!