I don't mean phase relationship, I said EQ and I mean EQ.
Most setups simply have their Pass bands and/or mid-bass bandwidth not EQ'd or mis-EQ'd. It’s an amplitude related problem.
Phase coherency over pass bands between the mid-bass to subwoofer are very very rarely problematic, it’s far below any frequency where front to back spatial cues exist, and in general people aren’t sensitive to any ITD’s below 250hz (which isn’t related to bass upfront but rather horizontal azimuth point source localization).
I’ve been involved with a handful of discussions and tests stemming from phase coherency, acoustic summing, distortion, and absolute phase due crossovers being used.
I’ve always thought Rainbow’s drivers lack low end.
Personally, I’ve never seen one of the above mentioned drivers IB in an acoustically sound environment, like a house. But as far as car “IB” (if you can call it that) mounting is concerned, highly damped drivers (over damped) typically are a prefect fit for mid-bass/midrange. Typically the frequency point where damping dominates response, is low enough to where car resonances and summed responses need very little eq’ing.
And I can’t believe you think Seas mounted in a car are thin on the low end or Scan’s are boomy. You must really have had bad installs.
