Working on geting a wiring schematic togeather but still in the building process.... I think I can pretty well walk you thru it and if you have gathered all the pieces parts you should be able to follow along.
Starting with the RS 32-1221B Transmitter,remove the battery cover and remove the philips screw this lets the transmitter open up so you can see all the goodies inside...Snip off the external mic wires as close to the circit board as possible, and throw over your left sholder. ( That way your only in there once with a soldering gun ) now take a 6'x 1/8 mono jumper cable, and cut in in half. Strip back one end of the cable just enough to get ahold of the wires to solder, and solder it in the place of where you sniped the wires off the circit board on the transmitter.Now instead of a mic on the transmitter you have a 1/8 mono jack that can plug into your audio source. If you like instead of the 6' jumper you can pick up the cord with the built in volume control at RS and have the ability of controling the volume there as well as from your audio source. (Thanks again Motusa for another great tip)
The reason I opt for the premade cables is to keep things looking profesional, as well as cutting down on places where the wire might be able to short out...( not real handy tryin to repair a broken solder joint or shorted wire out in the field )
Reassemble the transmitter.
Now for the reciever, remove the philips screws from the bottom of the reciever and pry the top and bottom half's apart. Snip off the 110V cord as close to the circut board as possible, remove cord and groumit from reciever and throw over your left shoulder. This leaves a hole in the back of the reciever about 1/2 inch in diamater. I installed a 1/8 female mono recptacle with a rubber groumit around it in the hole for a couple of reasons...one to keep the bugs from crawling in and taking up residency in my reciever, and two becuse otherwise you would have to get your audio output from the line out jack ( which is an RCA type jack ) This way I can carry my roll of wire with me which has male and female 1/8 mono ends and if my wireless setup has a problem or batteries run down im not out of business for the day, I simply plug my amp into my audio source, roll out the wire and plug in the speaker.
If your not comfortable with adapting the circuit board for the 1/8 female mono recptacle that is fine...you can pick up your audio from the line out RCA jack on the back of the reciever, I just made mine that way to keep everything looking profesional and for ease of droping the wireless system out of the caller if need be. If you opt to go with the RCA line out set up, plug the old 110v hole with a rubber plug and skip the next parragraph.
Back to the reciever... after installing the female 1/8 mono recptacle, remove the circut board carefully from the housing becuse one of the wires has to solder onto the bottom of the board as the RCA jack that is there is above the solder joint. locate the solder joint on the underside of the board, under the RCA jack ( it is the joint that you can not see from the top side ) solder one of the wires there and sneak it around the end of the circut board, and reinstall the board, now locate the RCA jack conections on the top of the board and solder the other wire from the 1/8 female recptacle onto one of the two exposed legs of the jack.
Reassamble the reciever.
Now for the 12v power supply, I got an 8 AA battery holder and soldered on the a short length of wire with the proper jack to fit in the 12v external power recptacle...make sure you have the polarity propper ( the positive goes on the center terminal, the negitave is the outside terminal. )
Now for the speaker, I took the RS 25 watt outdoor speaker, on sale for $14.00 and superglued a piece of plexaglass to the bottom mounting leg of it to give it a smooth surface to mount the velcro to, and souldered a 1/8 mono plug onto the wires.
Now take a roll of sticky back velcro and velcro the speaker to the top of the reciever and the RS Mini amp to the back of the speaker. ( Carefull not to cover the battery access on the back of the mini amp.) I also took velcro and attached my battery pack to the top of the reciever. That way all those components stay togeather but can also be broken down to make it more portable.
Ok here we go...take a short 12" mono jumper cable and go from the reciever to the mini amp input, take the plug from the speaker and plug it into the mini amp output, plug in the 12v power supply, and turn on the reciever and the mini amp ( the mini amp has it's own 9 volt battery ) Now plug the transmitter's 1/8 mono plug into the audio source, and turn on the transmitter and the audio source ... and if you have done everything corectly you should be making wireless music.
Any of you fellers that are working on the same set up feel free to jump right in here and throw in any other tips you can think of.
A small disclamer.....I am in no way liable if you reach for a ciggarette...and grab your soldering iron instead!!! Or can I be held responsible if you go for a dip of snuff and wind up with a mouth full of acid flux !!! And I don't even want to hear about "Fluffy" knocking the soldering iron off the table and burning a hole in your dining room carpet!!!
With that said...If you have any questions post them and I will see if I can help you out.