According to historical technical documents and seller listings, the BQA 120 (Part No. 7.607.782.510) features the following performance metrics: : 4 x 30 Watts maximum power.
4 x 30 Watts (Max Power) or 4 x 24 Watts (Sinus/RMS).
Since Blaupunkt is a German brand, search for: "Blaupunkt Quadro BQA 120 Handbuch original" .
Repositories like Elektrotanya host schematics for the BQA series (e.g., BQA 160 or 208), which share similar design architectures.
VTG 1993 Blaupunkt BQA 120 Bridgeable Quadro Amplifier Crossover 120w. ... 4 interest-free payments of $18.75 available with.
Vintage Blaupunkt BQA 120 Quadro Amplifier Booster 4x30W ... - eBay