Hosa makes dual TS-TS cables. [[url=http://[/URL]="http://www.hosatech…"]Here[/]="http://www.hosatech…"]Here[/] is an example of a 20ft one, but I didn't find 25ft on a quick search. Their photos have a touch of M C Escher about them in showing a cable with ends of the same handedness.

I have several things that I prefer to keep stereo, but I would use a stereo pre-amp or stereo DI to get it balanced as early in the chain as possible. I rarely run an unbalanced instrument cable any farther than absolutely necessary, whether it be guitar, bass, keys, whatever. I have a couple 18ft. instrument cables I would use for guitar, so I have some room to move. Everything else is balanced asap.

You might try someone like Redco for their [="http://www.redco.com/shopexd.asp?id=455"]2-channel snake cable[/]="http://www.redco.co…"]2-channel snake cable[/], or their [[url=http://="http://www.redco.co…"]Mogami 2-channel snake cable[/]="http://www.redco.co…"]Mogami 2-channel snake cable[/]. They're from nearby CT, so shipping should be very reasonable. Both are 2 conductor plus a shield cable, so they're capable of being balanced, or for your unbalanced lines you have several choices - A) snip the unused pair and solder the rest as usual, B) solder both wires to the tip and the shield to the sleeve as usual, or C) solder the first pair to the tip, the second pair to the sleeve, and attach the shield wire to the sleeve only on one end - cutting the shield at the other end in a way that it cannot possibly touch either the tip or sleeve. A little heat-shrink tubing would also be a nice touch where the outer jacket is cut away - but since the inner pairs are individually jacketed you wouldn't necessarily need any heat shrink.

Barring any of the previous suggestions - get 2 matched cables and tape them together with high-quality electrical tape to pair them up. A few wraps every couple feet will do the trick and still leave the cables flexible enough to coil up neatly at the end of the job. Heat shrink is another good option, and cheap tape isn't worth the time or effort.

Best of luck.

FYI - I wound up buying a bunch of these: [[url=http://[/URL]="http://www.amazon.c…"]Amazon.com: Hosa Cable CPP206 Dual 1/4 Inch To Dual 1/4 Inch Cable - 19.5 Foot: Electronics[/]="http://www.amazon.c…"]Amazon.com: Hosa Cable CPP206 Dual 1/4 Inch To Dual 1/4 Inch Cable - 19.5 Foot: Electronics[/]

We've done 1 gig with them and it seemed to work out just fine.

Those particular Hosa cables should work fine...at least for a while. They do have a tendency to snap a wire internally under the moulded strain relief, so keep an eye (ear) out for this. They are not repairable, unlike the Hosa "Pro Stereo" range.