Rex_Rocker , I like how you said Steve's tone is the antithesis of a traditional metal bass tone. He has all the ingredients of an old school Motown bassist (a warm bass tone I like to offset a modern, hi gain active pickup metal sound), and yet Steve has such cut, mainly because he's really loud in the mix and, in the old days with Martin Birch especially, the guitars were thin and nasally to make room for King Steve.
New Maiden (Brave New World and after, Kevin Shirley records), I definitely agree Steve has more clank and is better balanced in the mix vs. say, Piece of Mind. Brave New World was so hotly anticipated. I remember listening to Wicker Man and it sounded like Steve had suddenly become a pick player.
So I like Steve's old school tone, just not so up front in the mix.
I've noticed as I've grown older that bass tone that sounds good by itself sounds bad in a mix and vice versa. In trying to put my ideal bass tone in my songs, I often have to sacrifice a lot. Then guitars, snare, bass, kicks, everything get boosted to about 2 khz where we hear really well and then I have to start over again.
I think distortion in a mix is fine to help cut through. I especially love Sansamp plugins and pedals for this. And since it also works with guitar it is so versatile. But a lot has come out since then.
If you ask me what kind of bass sound I like to hear isolated, it's pretty much an old school Motown James Jamerson type thing through a clean Fender bass amp. Sometimes P's have too much mid honk, I agree, or even sound semi hollow. Sometimes I like a two P (hard to find) or PJ to balance this out.
And yet what's ironic is I think the rock and metal geared pickups made by SD (mainly the basslines SPB3) are best suited for a fat, dark, clean bass sound like Motown or hip hop.
I've found in metal I like the bass pickups to be less wound so the low end is tighter. HZs are great here. A little weak yes but dialed in to an amp right and they don't get in your way, unlike SPB3s which I found to be like the bass version of Invaders.
90s In Flames was my favorite band for a long time. I had the pleasure of meeting Jesper Stromblad in 2000 just before they hit it big. Peter Iwers had always been cool to me on social media (I recalled a time way back when he played ESP 6 strings and we chatted about that). Niclas Engelin and Niklas Sundin from Dark Tranquillity have been super cool to me too.
I love the Gothenburg scene generally and have a few friends from there from my music school days.
That said I always found IF's bass tone to be a little Jason Newsted-ish. It glued everything together but wasn't just in your face.
An alternative I like from that scene is Dark Tranquillity's Projector album. I think Martin Henriksson told me he used an Ibanez J bass copy and a Peavey Mark VIII bass amp.
The bass tone on that record is almost in Tool territory. Sets up such a dark ambience. I'll link you to one of my favorite cuts. I would say this is closer to a Steve Harris tone, also. A lot of low end, but it cuts through.
https://www.youtube.com/watch?v=oDA4nTstqSw
Out of the EMGs I've heard, I like the tone of their sets that mimic PJs. They seem to have more mids and cut through. But their dual coil sets seem to be scooped and glue the mix together while kind of disappearing on their own.
I may try an active bass at some point, but right now I'm more about juicing an HZ to be what I want than to try to dial warmth into an active. 24 volts may make a difference. We'll see.
The relative weakness of EMG's passive line is due to decades of their own marketing saying active is better. Even active EMGs are not super hot. The magnet pull is weak. My Duncan Distortion squeals and screams more than my EMG 81 ever will.
But the 81 just sits right in the mix around 2khz and so has that sound.
Rodney McG has a great bass channel for guitarists coming into the bass world. It's here:
https://www.youtube.com/@RodneyMcG
As far as Rex, I've identified his sound with Spector (which I think is similar to Warwick) for years. I think his more recent run with Thunderbird style basses matches his attitude and tone better. But I associate any Gibson bass with a very warm sound (they were called Mudbuckers for a reason).
Of course, if you want to go back to his glam days, he was playing Carvin. I always loved their stuff too. Pre-Kiesel Carvin was the Peavey of U.S. made custom shops--good gear at a fair, although not always cheap, price.