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JBL4607 4507 port mod, w/wo 3015lf
JBL4607 4507 port mod, w/wo 3015lf
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Old 30th December 2017, 11:14 PM   #41
osram is offline osram  Germany
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Join Date: Aug 2013
Location: Hamburg
Hi folks,


I am glad that I am allowed to visit this forum.
At first ... I apologize for my grammar mistakes and wordplays (... i favor german lyrics).



.. I am very late with this 'update', sorry .. but I think it should be added that you could find another solution at the
'JBL PROFESSIONAL ENCLOSURE GUIDE':

'CHART#6' show us that 2225/2226 is working in 4cubicfeet tuned to 40Hz ... known as the 3678enclosure (with 2226).

'CHART#8' show us that i.a. 2235 is working in 5cubicfeet tuned to 30Hz ... like the 4507enclosure.

It could also be said, that it is possible to drive the 4507enclosure with 2226 ... known as 4647 tuned to 40Hz with 6.5"portlength.

In summary, you could say that 4647 could tuned down to 30Hz with 11"portlength.

In my opinion this is possible for homeuse (...).


With best regards.

Last edited by osram; 30th December 2017 at 11:20 PM.
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Old 31st December 2017, 12:12 AM   #42
globalplayer is offline globalplayer  Germany
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Lower tuning requires more port area to compensate.
Also shorter ports sound better.
But yes...
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