making port longer..reduces tuning requency or increases it?

[mathxew 10+ year member]

I had a box ready to go tuned to 37 hz, bu last minute i made the port 4 or 5 inches longer...would this make it tuned higher or lower?

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[cshaw 10+ year member]

it would tune lower but your loosing airspace inside the box. unless you accounted for it when building the box.

 

[86yota 10+ year member]

Its gonna drop it.

 

[mathxew 10+ year member]

if i had it tuned to 37hz and i extended the slot port from about 23" to 30" is that going to give a significant drop?

 

[profundus-sanus 10+ year member]

you need to recalculate it... it depends on your box volume and port displacement

 

[PV Audio 5,000+ posts]

The question can only be answered in a general sense. In many cases, making the port longer can raise the tuning frequency, because the extra airspace taken up on the inside counteracts the effect of the longer vent.

 

[SeanDub 10+ year member]

Increasing port length also decreases box volume. Therefore, you need to account for both changes in order to determine the new specs.

 

[mathxew 10+ year member]

so if im not exactly sure what my tuning freq is whats a good place to set my SSF at? maybe 28 ?

 

[x2o 10+ year member]

Well what are the box dimensions? Measure it, it'll help much more than just the general question.