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<blockquote data-quote="shredder1" data-source="post: 8886999" data-attributes="member: 658920">I have had to address something similar with 4th orders before. Depending on how its tuned you can possibly raise the Lp even far as 100hz more or less to bring out the higher bass more or if you&#039;re tuned low with wind in mind its going to need a strong front stage with those missing frequencies in mind. Any bandpass by nature has a steep natural rolloff above (4th &amp; 6th) or below (6th) tuning and filter settings can put a hole in your music if not considered. A 4th has a response down low similar to sealed but will fall off pretty hard above tuning. So setting the lp for a 4th at 50hz may create a steep as heck slope affecting that midbass. I&#039;ve actually seen adjusting the lp higher help somewhat. You have the 4 15 solox setup correct? Do you know the tuning of the enclosure?And what does your frontstage consist of? Power and drivers?The thread title threw me off as additional subs in the cabin with a 4 15&quot; solox blowthru is...What you need is midbass and enough to keep up with your substage imo.</blockquote>

[QUOTE="shredder1, post: 8886999, member: 658920"] I have had to address something similar with 4th orders before. Depending on how its tuned you can possibly raise the Lp even far as 100hz more or less to bring out the higher bass more or if you're tuned low with wind in mind its going to need a strong front stage with those missing frequencies in mind. Any bandpass by nature has a steep natural rolloff above (4th & 6th) or below (6th) tuning and filter settings can put a hole in your music if not considered. A 4th has a response down low similar to sealed but will fall off pretty hard above tuning. So setting the lp for a 4th at 50hz may create a steep as heck slope affecting that midbass. I've actually seen adjusting the lp higher help somewhat. You have the 4 15 solox setup correct? Do you know the tuning of the enclosure? And what does your frontstage consist of? Power and drivers? The thread title threw me off as additional subs in the cabin with a 4 15" solox blowthru is... What you need is midbass and enough to keep up with your substage imo. [/QUOTE]

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