I don't understand these two statements:
My best objective interpretation of those two statements boils down to "these basses have passive pickups so I can't get enough volume out of them from my amp/cab."
And that just doesn't sound right. Are you saying you have the input gain all the way up and the Master Volume all the way up and they're still not loud enough for some venues? I think that's the only difference it would make if those pickups had hotter output.
It sounds to me like what you really mean is that the tone of those two basses doesn't cut through like the other basses. Which would mean it's nothing to do with passive versus active. It's just that you don't like the tone of those two basses. The tone they have doesn't cut through a band mix like the other ones you have, right?
LoL, I said it was clear as mud! Let me try to clarify.
The Dyna Unity IS an Active bass. I was basically trying to say is that it is not as powerful AS the other active Peavey's I own. For some reason, it just isn't as powerful or loud.
As far as the Foundation, I like the tone (or sound of the bass) just fine, I just can't get the power (volume) I need while playing out of it. The T40 HAS the power to cut through, while the Foundation doesn't. Call that tone or power, it just doesn't cut through the mix.
I play in two different buildings. In the first, smaller 500 seat building, I'm direct via a DI box into the PA. I have no real control of my volume except the controls of the bass itself into a monitor at my feet. When I play an active vs a passive in this setting, the active ALWAYS seems to cut through better (plays louder). I call it volume, you might call it tone. I'm not a very technical person. Call it whatever, the active basses just seem louder or more powerful.
In the larger building, I have an Ampeg B2R Head with an Eden 410XL and a 210xL cab. There are about 20-25 musicians in this service. Four Sax players, 3 Trumpet, Electric Keyboard, Grand piano, 3 Flutes, huge electric drum kit, three guitars, Trombone, 5-6 singers, it varies slightly week to week.
We are SO packed in on the risers, that I sit in a corner and my amp is about 4 feet away from me. I set my volume on the amp and all the volume adjusting I do is at my bass. When I use the Foundation, I get buried. I'd have to go and crank up my amp so much, the sound gets obnoxious.
I try to play at a volume that gives room or support to the other musicians. All I can say is, when I use an active bass, the tone or sound is loud enough for me to hear what I'm doing and not be glaringly obnoxious. The Foundation can't cut that environment but the T40 can. My Rickenbacker's do fine as well. Just the Foundation and the Unity give me issues.
I don't know if that's any clearer, but that's what I was trying to say.