Thanks man. This thread gave me good info. I Will defenitly try some different strings first. And then would look for some pickup options. So what is the biggest difference going from active to passive?
It depends upon the pickups. Some systems are passive p/u with a preamp. Others (like EMG) have a transistor (maybe more than just a transistor) under the epoxy. In that case, the p/u requires power (no bypass option) but it allows low impedence (so p/u doesn't get "loaded" by low input impedences). The EMG p/u does not require the use of a preamp, but do require a battery.When talking Active vs Passive it's important to remember that tone wise one is not better than the other, they both have pros and cons.
Generally speaking, an active preamp will offer a broader array of tone shaping options. Some active preamps have just two bands (bass and treble) others have three four or even five bands and others like Alembic go even further.
Passive controls (there is no preamp) offer basic tone shaping usually with a single knob called a tone pot that combined with a capacitor of a specific value determines the maximum amount of treble in the output signal.
I have many of both and they all work great. Beyond sound and the number of pots required the biggest complaint about active preamps is that they require a battery while in active mode. So unless you get one that can be switched between active and passive you're dead in the water when the 9 volt battery dies. This inevitably happens mid song while on stage (although it's never happened to me).
I'm not sure which pickups your Eppi TBird has but the pups in my Eppi Goth were less than stellar. I replaced them with Bartolini pups, which were nearly a drop in replacement (had to sand the rout a bit wider) and at the same time I dropped in an Aguilar OBP-2 two band active preamp and installed a coil split switch. It's quite stellar now and does everything from Thunderbird on steroids to baritone guitar.
One thing to keep in mind - I don't think the p/u in the Pro-IV/V is the same size as other Thunderbird p/u. No matter what you choose, you will have to do some modification. If you are OK with routing, it opens up your choices.
