Hi everyone. First time posting here.
This is my second DIY sub but first time trying a ported design so I could use some of your expertise.
The sub is going to be 7 cubic feet tuned to around 19hz. It will have dual 4" precision ports 23" long and will use an Avalanche 15 driver. I am making 2 of these subs. Material is .75" MDF. Powered with a Samson S1000.
Here's my initial plan:
So here are my questions (maybe a bit elementary):
1. Does the port HAVE TO be supported by the brace? The precision port seems light enough that supporting it seems optional. If I do end up supporting the port with the brace, what do you guys use to adhere the port to the hole in the brace? Do you use some type of gasket?
2. How do I cut a precision port?
3. I will be lining the inner walls with .5" thick rigid fiberglass that I have laying around. Is this fine? Also, is it recommended to wrap the port? If so, what should I wrap it with?
4. I am considering several options for driver and port placement. The dual subs will live in the front corners of the room. Based off this layout, are there any pros and cons to these different driver/port configurations? I prefer the first option since I don't have to do any bends in the ports.
The subs are going behind the screen wall
Currently, they are in an IB
Any additional thoughts, comments, tips would be appreciated.
This is my second DIY sub but first time trying a ported design so I could use some of your expertise.
The sub is going to be 7 cubic feet tuned to around 19hz. It will have dual 4" precision ports 23" long and will use an Avalanche 15 driver. I am making 2 of these subs. Material is .75" MDF. Powered with a Samson S1000.
Here's my initial plan:

So here are my questions (maybe a bit elementary):
1. Does the port HAVE TO be supported by the brace? The precision port seems light enough that supporting it seems optional. If I do end up supporting the port with the brace, what do you guys use to adhere the port to the hole in the brace? Do you use some type of gasket?
2. How do I cut a precision port?
3. I will be lining the inner walls with .5" thick rigid fiberglass that I have laying around. Is this fine? Also, is it recommended to wrap the port? If so, what should I wrap it with?
4. I am considering several options for driver and port placement. The dual subs will live in the front corners of the room. Based off this layout, are there any pros and cons to these different driver/port configurations? I prefer the first option since I don't have to do any bends in the ports.



The subs are going behind the screen wall

Currently, they are in an IB


Any additional thoughts, comments, tips would be appreciated.