Precision Port in AA Cabinet

[JazzScreamer 1]

Still working on my AA Arbiter and needed help with my Precision Port tubes. The enclosure plans call for a 3" diameter and 5" length port. The enclosure is a 1.0 cu.ft. I have two questions.....

1. What is the tuning freq. of the enclosure

2. Are the dimensions for the port specifically for a Precision Port or is this for your regular 3" tube at 5" length.

Reason I ask is because the Precision Port directions have different direction for tuning. I guess this is because of the flare on both sides.

I really need some help with this. AA experts I need you.

Thanks,

Bob

[tech2332 3]

Still working on my AA Arbiter and needed help with my Precision Port tubes. The enclosure plans call for a 3" diameter and 5" length port. The enclosure is a 1.0 cu.ft. I have two questions.....

1. What is the tuning freq. of the enclosure

2. Are the dimensions for the port specifically for a Precision Port or is this for your regular 3" tube at 5" length.

Reason I ask is because the Precision Port directions have different direction for tuning. I guess this is because of the flare on both sides.

I really need some help with this. AA experts I need you.

Thanks,

Bob

5" Length?

That would give you over a 50 Hz tune...

Try this website for a Flared Port Calculator.

PSP-Inc.

[JazzScreamer 1]

Still working on my AA Arbiter and needed help with my Precision Port tubes. The enclosure plans call for a 3" diameter and 5" length port. The enclosure is a 1.0 cu.ft. I have two questions.....

1. What is the tuning freq. of the enclosure

2. Are the dimensions for the port specifically for a Precision Port or is this for your regular 3" tube at 5" length.

Reason I ask is because the Precision Port directions have different direction for tuning. I guess this is because of the flare on both sides.

I really need some help with this. AA experts I need you.

Thanks,

Bob

5" Length?

That would give you over a 50 Hz tune...

Try this website for a Flared Port Calculator.

PSP-Inc.

Yes 5" . This is for a MTM setup. I'm sure it's in the 50hz somewhere. If I knew the original tuning Freq of this design, then I can figure out the length of the port. I just want to know if the enclosure diagram is specifically for the PP or just a generic PVC port.

[tech2332 3]

For a precision port you need to add 1" to what is calculated from a regular non-flared port

[///M5 2,833]

It'll be pretty close with the 1" approximation and luckily the crossover isn't affected by what you do on the bottom end. If you are within a few Hz it should be fine.

[JazzScreamer 1]

It'll be pretty close with the 1" approximation and luckily the crossover isn't affected by what you do on the bottom end. If you are within a few Hz it should be fine.

I modeled the different lengths of the port. Give or take an inch, and it only made a difference of a few hz.