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Digging jbl sub tuned to 42 hz

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I have it wired for full power but since the amp is capaable of 1200 I keep the gains low. I listened to it a little bit and like it. I think I’m going to leave an inch sticking out and attach a 4” elbow aimed to the rear. 

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23 minutes ago, 2RZ-FE said:

I have it wired for full power but since the amp is capaable of 1200 I keep the gains low. I listened to it a little bit and like it. I think I’m going to leave an inch sticking out and attach a 4” elbow aimed to the rear. 

Not sure i follow i thought you said it was an external port? What would an elbow added to it lower the tune to?


2006 ridgeline hu:KW ddx9903s morel 5.25 maximo comps 6.5 maximo coaxial 2 type r 8s 1.1 37 hz amp Rf t1000x5ab

work truck 2017 international pro star Alpine ute62 hu. Amps RF t1000.5ad 4 ch mode infinity k1000  type s 15 3.5 @ 30hz or type s12 2.4 @ 36 hz  or jbl s3 1.5 42hz. 2 8 " eminence pro woofers. 2" Dayton rs52fn midrange. 1 1/8 Dayton dc28f silk dome tweeters.

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It is external, 10” long. I will cut off the port leaving 1” outside the box so I have the elbow to attach to it. Once the elbow is in place I will either cut it or add to it to get 10” measured down the middle. 

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7 minutes ago, 2RZ-FE said:

It is external, 10” long. I will cut off the port leaving 1” outside the box so I have the elbow to attach to it. Once the elbow is in place I will either cut it or add to it to get 10” measured down the middle. 

Oh ok I c. You might need a little more than a inch. If I remember right,the elbows I've used anyway,go in a little deeper than an inch. Been a while since I've needed to use 1. If you have the room I'd try a 90 degree sweep instead of a sharp 90. I would think the air flow would be a little better.

Well that's cool you can experiment and see what works best in your car with that box and sub before you upgrade to something else. 


2006 ridgeline hu:KW ddx9903s morel 5.25 maximo comps 6.5 maximo coaxial 2 type r 8s 1.1 37 hz amp Rf t1000x5ab

work truck 2017 international pro star Alpine ute62 hu. Amps RF t1000.5ad 4 ch mode infinity k1000  type s 15 3.5 @ 30hz or type s12 2.4 @ 36 hz  or jbl s3 1.5 42hz. 2 8 " eminence pro woofers. 2" Dayton rs52fn midrange. 1 1/8 Dayton dc28f silk dome tweeters.

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The sweep might be too long though. Just dawned on me how short your port was. 


2006 ridgeline hu:KW ddx9903s morel 5.25 maximo comps 6.5 maximo coaxial 2 type r 8s 1.1 37 hz amp Rf t1000x5ab

work truck 2017 international pro star Alpine ute62 hu. Amps RF t1000.5ad 4 ch mode infinity k1000  type s 15 3.5 @ 30hz or type s12 2.4 @ 36 hz  or jbl s3 1.5 42hz. 2 8 " eminence pro woofers. 2" Dayton rs52fn midrange. 1 1/8 Dayton dc28f silk dome tweeters.

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The standard sweep I think is 8.09" long. Add .75 for the wall of the box. Might have to add a small piece to the other end or box end won't know until I do it. Add a flush piece inside the end that flares from 4" to 5" so its 4" the entire length.

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2 hours ago, 2RZ-FE said:

It is external, 10” long. I will cut off the port leaving 1” outside the box so I have the elbow to attach to it. Once the elbow is in place I will either cut it or add to it to get 10” measured down the middle. 

By the way take off for a short radius elbow is 1.5×diameter

 

Multiply by 2 to get the length of the elbow down the center.


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