Thanks guys (all)...this thread is great....
I will put the Chromes on the P/J tonight during the Penguin/Red Wing game .... then i will expect pure thunder!

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I may try and bring it to the next rehearsal if the DiMarzio pups and flats dont shake the floor too much....we have alot of singers (leads and bkgd) on stage at the same time on most R&R songs we do.
My band is a five piece, and we all sing lead and harmony so there is almost always a group of vocals at any given time. Plus we have two guitarists and a keyboardist, so there is a lot of sonic saturation going on.
Rounds work in that situation, but flats work better for me. With flats it seems I have my own sonic space as my bass has it's own low end distinct sound. There is no mistaking the bass for what it is and it never sounds like it is just a part of the sonic mush of guitars, vocals and keys up in that already too full area of mid-range. With flats it seems to sit down with the drums better in the rhythm section with no need to cut through to be heard.
Think about it...drums don't need to "cut through" and neither do guitars. So what is it about bass players feeling they need to cut through the "mix" to be heard? What part of the mix is it that is preventing us from being heard?
IMO, that part of the mix is exactly where the guitars are already over saturating and those tones bass players want heard (but can't) are precisely those overtones and bright sounds roundwounds give that flats don't.
It appears to me that for all the love of those zingy, bright, crisp piano-like tones roundwounds have, it only get lost "in the mix" anyway and most roundwound users waste too much time and energy fighting that phenomenon, struggling to "find their tone" and end up pushing too much of those ugly, honking mids in an effort just to "cut through".
With flats there simply is no need for that because that area roundwound players are fighting to get heard is exactly what flats lack anyway. But what flats do excel at is providing that thick, smack-you-in-the-chest bass sound that is clearly in it's own sonic space where no one else goes.
And I think that is precisely what I feel I'm missing when playing alone using flats. There are no guitars filling that void when I'm playing alone, so my strings don't sound the way my mind is programmed to expect. Alone, I'm expecting to hear those tones but they aren't there, which is fine in a group mix because my bass doesn't need them in that setting as the guitars provide it. Which is why in some situations rounds are better; i.e. - When there is not enough guitars or keys filling that sonic area, and the roundwound "tones" can be heard easily.
To me, another advantage of flats is that they allow me to actually cut my low end more and still have it be heard and felt. This is probably due to the stronger fundamental flats provide. With rounds, I've had to accentuate the mids (to cut through and hear that roundwound sizzle) but also boost the lows to compensate for (or warm up) that annoying mid tone and give a stronger "bass" sound, which only robs my head of power and can end up saturating the stage with unnecessary low end if I'm not careful with it. Since switching to flats I've noticed my amp doesn't work as hard to provide the same volume of low end tone. And based on the digital readout of my output gain, I'm pushing my amp about half as hard and yet hear myself better.