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<blockquote data-quote="3.5Max6spd" data-source="post: 2351967" data-attributes="member: 555373">There are certainly no rules. The 4&quot; cones I&#039;m using now are playing 420hz 18db HP. I can play them 120hz 12db no problems. They simply sound better from an integration and imaging standpoint at that xover point , versus playing down to 200hz or so.They are in the Kicks, with a 8&quot; midbass driver 5&quot; from them at the bottom corner of my door- which are LP ~ 250hz 18db. You&#039;ll find in many cases a good reason to underlap the 300-400hz area as its boosted by the car environment.Also playing actively with a midbass, you&#039;ll soon find out that when you bandpass a driver....and it does not at least cover a range of 2- 2.5 octaves(you want to double the frequency at least twice from its high pass point)- it affects immensely the overall output of the driver.So IMO if your midbass driver is on the same vacinity/plane your midrange will still sound like its coming from the kicks as the lower frqs become unlocalizable.So instead of dwelling on &#039;pathlength differences&#039; its certainly more important for me to use a driver based on its tonal characteristics. For example the DLS IR3 midrange has been in MANY SQ competition winning vehicles, regarless of its lower register issues. Scott Buwalda even did well with a door midbass, dome midrange in kicks, a-pillar tweets. Its all about integration.</blockquote>

[QUOTE="3.5Max6spd, post: 2351967, member: 555373"] There are certainly no rules. The 4" cones I'm using now are playing 420hz 18db HP. I can play them 120hz 12db no problems. They simply sound better from an integration and imaging standpoint at that xover point , versus playing down to 200hz or so. They are in the Kicks, with a 8" midbass driver 5" from them at the bottom corner of my door- which are LP ~ 250hz 18db. You'll find in many cases a good reason to underlap the 300-400hz area as its boosted by the car environment. Also playing actively with a midbass, you'll soon find out that when you bandpass a driver....and it does not at least cover a range of 2- 2.5 octaves(you want to double the frequency at least twice from its high pass point)- it affects immensely the overall output of the driver. So IMO if your midbass driver is on the same vacinity/plane your midrange will still sound like its coming from the kicks as the lower frqs become unlocalizable. So instead of dwelling on 'pathlength differences' its certainly more important for me to use a driver based on its tonal characteristics. For example the DLS IR3 midrange has been in MANY SQ competition winning vehicles, regarless of its lower register issues. Scott Buwalda even did well with a door midbass, dome midrange in kicks, a-pillar tweets. Its all about integration. [/QUOTE]

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