Hello All - I found some old cheapo powered computer speakers hanging around the house, and wondered how they would sound hooked up to the headphone jack of my 5150 III head? I have not played this amp in a long while so I wanted to see if I could get a fun, low volume sound out of it with these cheapo speakers. (PSA NOTE AMP must be plugged into a Speaker Cab as well!!!) Wow, it sounded pretty good! I could crank the amp and dial in the speaker volume to taste. It was fun to hear things on a small scale, and still be able to run full tilt with the amp, pedal board, and effects loop. It had decent feel, and I was able to dial things in as saturated as I wanted. The clean channel was a little anemic so I had to drive it a bit harder than normal. All in all, a really cheap and fun solution for low volume practice. This of course may be filed in the category of "How can I make my awesome tube amp sound crappy?" section of TGP, but it was a fun experiment to try!