I want to try a few stereo-ish ideas through two amps together.

I have two different cheapo pedals that can split my signal, one of those standard Morley A/B/Y boxes (passive), and a Boss Line Splitter (active?). I have the sense that there's some reason I should be using a box of higher quality. Will I lose signal with one of these? I know there are several fancier pedals that are supposed to be completely transparent. Any recommendations? What about grounding issues, etc?

This is for two different kinds of setups, one for live playing with high powered amps (Traynor and Marshall heads), and one for playing at home with extremely low powered old old-school amps, like a 1940s Rickenbacher 5 watt combo. I don't know if that makes any difference to my question....
danke!

there are several threads about this topic, so feel free to kerble yourself (that means, do a search in the tech room).
but anyways, the boss line splitter should work really okay, also the morley.

rickenbacker 5 watt combo.. i bet it sounds awesome.

ah, sorry about that. the rick amp is amazingly awesome sounding. very sparkly and clear, with nice tube breakup. not at all mufled and mid-rangy like those little amps tend to be.

There are a ton of threads about this, but I'll suggest something that's not in those threads.

Mod a jack for each pu, and send the neck pu to amp A and the bridge pu to amp b. You can dial in THAT sound, and effect each pu as you want.

I've been working on a few four string stereo guitars based on a 50/50 design of Ricky Wilson/Lee Renaldo, but I've separated each set of two with a single coil on each side. My newest stereo four string is going to have 6 pus total - three on each side. I've been using two jacks because it's just easier for me to visualize/process two lines going out, rather than one stereo jack - and I don't have siggy issues. Takes a little getting used to...

sounds like fun. I just played one of those cool looking Burns "Jazz" guitars, with a "split sound" setting, neck pickup on the bass strings, neck pickup on the high strings. sounded weirdly good. i'd like to hear the reverse too.

I looked around the old posts but still don't quite have an answer. The amps I'm using are very picky to input gain. I'd rather not use separate booseter pedals to keep my levels the same, considering the volume drop I'd have with the Morley pedal. Has anyone used the Lehle or Radial pedals? Sorry if this has already been talked about and I just missed it.

Build a siggy splitter....

...or:

Axess Electronics BS2 Guitar Audio Buffer/Splitter

I use a Radial Engineering ABY box

http://www.tonebone.com/re-bigshot-aby.htm

Very well built and is the best one I've found. I'd like to buy their big guitar splitter/reamper but it's costly.

My advice would be to use either a MORLEY tripler which lets you select one of 3 outputs and and also has a "make up gain" knob on it, which helps as i've noticed that the normal morley aby switch sends less signal to one side, might just be my box though.

otherwise i second the radial suggenstion but maybe a step up to the "switchbone" i have to admit i really hate the tonebone names but they're stuff is so much better than it's name. There's pickup load correction and a variable mid and power boost to the outputs, and a tuner out. Radial stuff is solid as all get out and if you have the scratch, well worth it.

can someone explain to me how the signal isn't lowered when it's split on the radial?

I assume there's an active gain stage. Right?