Hi, I own an integrated amp, a Realistic SA 155, with 1.8 watts per channel @ 8 ohms with 20-20,000 hz frequency response. Not a boombox, but the the volume and full tonal range was literally unbelievable! Modern,800 watt claims, remind me of bargain car audio eq/amp claims of 200+ watts per channel back in the 80s. Look to your output caps . Replaced 470's with 2200's in a Panasonic RX 5100 (5 watts per channel); what a difference! Thanks.