The Class A 40 is Soundstream's very first Class A amplifier, built in the mid to late 80's. This may be another amp designed by Nelson Pass who did earlier work for Soundstream.
16watts continuous per ch Into 4 ohms, 20 Hz-20 kHz
25 watts continuous per ch into 2 ohms, 20 Hz - 20kHz
Bridged Mono 60 watts continuous into 4 ohms, 20 Hz-20 kHz