Sub too boomy

Hey folks, hope everyone is well and safe. I just installed a system on my '05 GTI and the sub is "boomy" so to speak. meaning that the lowest bass freqs are compromised and there is a slightly overbearing boomy quality. I need the bass to be tighter and punchier in the lowest freqs. should i look at different enclosure styles? or something else? Anybody have similar issues or am I the only one who wants to drive around in a mini Valve soundsystem on wheels? If there are any DnB heads in the place, please report to the forum.. I tune my sub for Dillinja choons. at the moment: Alpine 9847 Eclipse parametric EQ (in dash) Eclipse 5 channel amp 1 farad cap Polk Db components up front and Coaxial in rear MB quart 12" in sealed box its a modest set up, but the quart 12" really does the bizness when tuned properly!

Hi stevdart, dwarren, to answer your questions; the rear coax and front components were set up so there was NO bass at all coming out, there was no doubt it was the sub that was the 'boomy' perpetrator. I re-adjusted the amp's HP crossover to get a little bass out of the front woofers to try and balance the bass out and then lowered the parametric EQ on the sub to atenuate the boomy freqs. There is a guy working at this shop who has a highly trained ear, or so they tell me. He tuned the whole thing initially. stevdart- when you say 'baffle separator', to what are you referring, specifically? The Box...the size matches the speaker pretty close, its a 1.0 cubic feet Q-logic sealed box, the MB Quart Premium DVC 12" - MB Quart recommends .95 Cubic feet, in fact that number is straight from Brian Sherman at MBQuart. since I posted the original message, I have been working with the systems' crossovers, parametric eq and 6 band eq a bit. There is a crossover on the Eclipse EQ thats located on the top of the unit which is inside the dash, I cant access that without pulling it. One thing that made a big difference was turning the Sub-box around so it faces the cabin. i also increased the amps sub crossover section to about 70 or 80hz, and then dropping the parametric EQ (in-dash) to 25hz, Q in the middle somewhere, not too wide, and not to much gain as the sub is loud. That seemed to tighten it up a bit. Then, setting the HP crossover for the front at about 80hz or so, instead of the 110 that the installer set it when he 'tuned' it, which left a big mid-bass gap. Thats as good as I have gotten it so far. When I drove home from the installers, the sound was pants, despite the "expertise" of this dudes 20+ years of judging competitions and building systems.   The front spkrs and sub sounded like they were in different rooms, and didn't coalesce at all. Right now, the system is sounding a little better, and it does drop ok, just not low enough. that said the sub is obscenley loud. I hope I didnt leave anything out, you guys's help is much appreciated! peace