The rumble 500 head and a single cab is the same 350w as the combo, unless you buy a 4 ohm cab. The current rumble line are all 8ohm cabs, so 2 would be needed to get the full 500watts. The combo is still the better value.
350w is plenty though, 500w through the same amount of speakers theoretically is not really much louder than 350w, to get just 3db louder you need 700w, and for double the volume you would need 3500w (and a cabinet with unobtanium speaker coils)
The real boost comes from more speakers pushing more air, the 500w is just a nice touch of headroom and oomph added to the mix.
Thank you ubernator. Really appreciate the help. I was reading up on all that stuff last night through searching previous theads while having insomnia again lol. About the size of the speakers, how you can get more and better sound out of different set ups, all the (new to me) new ways they are marketing amps these days and how you could make a lower wattage bass amp sound louder than a larger wattage amp through which speakers and amount you use. The last time I had a full stack guitar rig was back in 1987 lmao. It was easy because you just went out and bought a Marshall full stack for playing metal and rock.
Then I went back to playing my Fender combo's through the years at home because friends moved and we didn't want to find replacements. I was good back then but suck now because I haven't gotten back to a steady practicing routine. I did have a PA system that my buddy let me use in 1990 when I got in to singing but after that, all I ever needed was a combo and some pedals to play at home. Then I just never played because I was working too much. But that's all changing now. I have songs written on the guitar and lyrics that I have come up with through the years and want to record them at some point. Plus it's a lot easier to do some simple recording at home these days with all the computer software and gear. A lot cheaper too lol.
My step bro is an insane musician who is in a world wide known band that's basically all him. He wrote and played every instrument on the albums and then taught his friends how to play the songs so they could tour. He went to Berkeley for recording and does most of his recording out of his home and the stuff sounds awesome. It's funny because he had 3 different types of music going on and the one that made him big was a funny spoof band he made up through using members of his friends bands on the videos. He is the only band that actually won the honor of getting on the first Guitar Hero video game. The rest of the bands on that game got on it because they were all friends with the creators of it. But I don't bother him for gear input because like all of you know, everyone has different taste and their own sound that they are looking for.
So today I might try to get out to the local San Ash and ask them for some help on what set up I would need to put together to get the sound and power I am looking for in a larger rig. Then I want to try out some more combo amps to see how they sound with my Yamaha TRBX304 Bass. The Rumble 500 combo Seems like the best option for a home practice amp and should get me by with the drums in the background. But I will hopefully get some help today on what I can put together to get a louder sound out of a 1/2 stack or full stack. I still wish I could find a shop with a used Line 6 LD Lowdown bass amp in stock. I read that people really liked the sound they got from them and now I am curious about them. I might just call the shop up north where I took lessons, bought all my amps, gear and is good friends with my family. They are a big Fender dealer, know their stuff and are an honest shop who would help me out instead of trying to just get me to buy buy buy lol. We have 3 generations of family that have bought all their instruments there and taken lessons from them. They are a small town shop and his son who took over the business back in the early 80's, went to school with my aunts and uncles. Thanks again for all your help and have a great 4th Of July!