Enclosure JBL P1022 feedback

[Pauwl]

Hi,

I want to build a enclosure for a single JBL P1022 sub. I like all kinds of music but especially hiphop. I have run the parameters in WinISD JBL P1022 SPECIFICATIONS Pdf Download. and comes up with the following enclosures (sealed and ported)

Sealed: 45 liters (1,6cu ft) q .7 f3 35hz

Ported: 45 liters port 4" x 27" tuned at 27hz. The port is a bit large but I could fit it with a corner in it.

All net volume. The JBL recommended enclosure doesnt looks too great in winisd, a large bump at 37hz, and lots of port noise.

The ported enclosure looks ok, group delay looks a bit high but that's at 25hz, so I'm not sure if you will notice that. Air velocity should be ok.

Any thoughts? Or should I just stick with the JBL recommended?

I will have 500-600w rms available.

Grey is JBL recommended, Yellow is what I came up with.

View attachment 26555308

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Thanks in advance.

Regards Paul

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[trumpet 5,000+ posts]

If you follow JBLs recommendations you will be good. If they recommend fiber fill, do that. Port flare? Do that too. I haven't seen the enclosure sheet for that sub.

 

[Pauwl]

Thanks for your reply.

I have simulated the box recommended by JBL (it's the grey line in the pics) but isn't 240ft/s air velocity not way too high (because of the small port diameter)?

 

[trumpet 5,000+ posts]

Your graphs don't resemble the JBL graphs because they aren't derived the same way. JBL actually measures the subwoofer outside and inside cars. The in-car predicted response is an average of many vehicles. You're also planning to use more power than what it's rated to handle, and although that in itself is not a big deal, you may want to increase the port area a bit and consider an amplifier with a subsonic filter if yours lacks that feature.