I'll look for gold/copper splitters. The one's I have are gold plated but I've no idea what they are made of underneath. Probably cheesium. They were cheap.
Just to be clear, everything got pulled off the splitters, including the 2nd set of cables. So all that was in the chain were the splitters and the RCA cables to the main amp. When the splitters were removed the sound improved. So this particular problem is likely not an impedance issue - just too much garbage in the signal path.
For this and other reasons there are no front subs running. The sound from the 4 pi's is just a whole lot better without the splitters and crossover. You don't have low bass but what's left is much better. Actually, it's pretty excellent.
There are other issues, some likely impedance, going on with other parts of the front sub crossover and amplification chain. Tried to fix it a few years back and got nowhere so I've just been listening sans subs. It sounds really good so it's kinda hard to get motivated to make changes.
When good splitters are found the next step will be finding a crossover/amp with the same impedance as the amp running the 4 pi's. Hopefully that'll fix the suck out that happens with the existing crossover.
We're still in air conditioning season so nothing much will happen until fall. Then it's time to play.
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