Thanks to this group, I decided to use the effects loop to run my 100 and 500c together this morning. This sounds awesome. I was considering getting the 800c but honestly this setup gives me all the volume I imagine I'll ever need and then some. The only issue I had was there was some slight rattling coming from the grille on the 100. Any fixes for this?
Cheerio, Ken. @Kenny056, you are now member #1760 in the Fender Rumble Club. Congratulations and welcome. Please put that number in your TalkBass Signature for safe keeping. Then make yourself at home here and on your Rumble Club Wiki page, the repository of all Rumbling wisdom and knowledge.
Ken, try compressing the staples in the area of the grill cloth frame with the rattle. Otherwise, some Rumblers have added a few more velcro pairs between the originals. Hope this helps.
How about telling us a bit about yourself, such as your bass experience in general and your Rumble journey in particular? You'll fit right in here since we have all kinds. But we all love to ... ... ...
Rumble On!
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What'll we do? 
Getting close, Timbo!