212 model, question

[basscooker]

Hi guys. Did I hit sawdust time with this model?

My REAL question is about porting. Can you have reasonable velocity showing on a graph; yet the physical box still exhibit chuffing? IDK, above my knowledge base... seems 1.5" (even though it's x22") is pretty slim on 2x12 at 340 watts.

Would rather not discuss the driver. Let's just say its design and manufacture are legit for sure.

Thanks for any assistance

Oh, can't see it in the Pic, m/s.

 

[basscooker]

 

[basscooker]

 

[basscooker]

-6dB @ 60.28 Hz

-3dB @ 72.57 Hz

125.191 dB@ xmax, 340 watts

 

[basscooker]

It'll want a steep hpf @ 45-55Hz

 

[agedhorse]

You might need to slightly radius the edges of the shelf port.

 

[JeezyMcNuggles]

Hi guys. Did I hit sawdust time with this model?

My REAL question is about porting. Can you have reasonable velocity showing on a graph; yet the physical box still exhibit chuffing? IDK, above my knowledge base... seems 1.5" (even though it's x22") is pretty slim on 2x12 at 340 watts.

Would rather not discuss the driver. Let's just say its design and manufacture are legit for sure.

Thanks for any assistance
View attachment 4990701

Oh, can't see it in the Pic, m/s.

Make the port larger, but not as deep

 

[agedhorse]

Make the port larger, but not as deep

If the port is made larger in area, it must be deeper (not less deep) to maintain the same Fb.

 

[basscooker]

Yeah its already over 8" deep. I don't think a longer port is a good idea. It may be fine, but I'm trying for a compact box. It's already looking 14 or more inches deep, accounting for baffle set back and leaving space at the end of the shelf inside there.

The local motor repair place has been getting some large stuff lately apparently. I picked up two big pallets that had a 1/2" ply top for me. So looks like I have enough for all my panels. Heading for a mock up in the next week or so then! If it sounds good I'll be tracking down some better stuff for a final build on it. Yea hey.
Thank you.

 

[beans-on-toast]

Things in the way around the end of the port or hard edges can cause chuffing. Aerodynamic airflow is the goal.

 

[Burwabit]

Looks like my 401K

 

[Wherestheone]

Some good questions and guidance here so far, but....are you sure the flux capacitor has enough blinker fluid in it? And more importantly....when was it last changed? Asking for a friend...

Seriously....holy cow there are some smart folks here!!

 

[Mingo Sanders]

Looks like my 401K

What 401k is best for metal?

 

[basscooker]

Hi, guys.
Ok; so yaknow that phrase: "measure twice, cut once"?

Ahem. Yeah...

I have a tangential question regarding my first post. Would a few vertical round dowels supporting a shelf port change the tuning much? Would it be different than just a 3/8" brace in the center?

Thanks.

:/