AVS Forum banner
1 - 15 of 15 Posts

·
Registered
Joined
·
3,652 Posts
Discussion Starter · #1 ·
The response looks good except that nasty dip. Did I do this right?


T/S:


Znom - Dual 2 ohm BL - 21.4 n/a Cutout diam - 16 3/4

RE - Dual 1.5 ohms Sd - 1210 cm2 Outer diam - 18 5/8

FS - 22.9 Hz Mms - 360 g Mounting Depth - 10 1/2

Vas - 280 L Spl - 91.8 dB 1W/1M Weight - 40 pounds

Qms - 4.962 Rms - 1500 W Voice Coil Diam - 3 inch aluminum

Qes - .334 Xmax - 25 mm one-way Voice Coil - Dual 2 ohm

Qts - .318 Price - $350 Cone - Paper/Kevlar fibers

Le - 1.2 mH



Home Audio ~ 8-10 Cubic Feet / 18-20 Hz tuning

Car Audio ~ 6 Cubic Feet / 28-32 Hz tuning

 

·
Registered
Joined
·
1,866 Posts
while i didn't plug the numbers into Unibox, the graph looks as it should for a ported enclosure. I think the "dip" you are referring to is the one of the graph labeled "SPL of the Driver"...you want to look at SPLtot
 

·
Registered
Joined
·
6,294 Posts

Quote:
Originally Posted by vitod /forum/post/0


The response looks good except that nasty dip. Did I do this right?


T/S:


Znom - Dual 2 ohm BL - 21.4 n/a Cutout diam - 16 3/4

RE - Dual 1.5 ohms Sd - 1210 cm2 Outer diam - 18 5/8

FS - 22.9 Hz Mms - 360 g Mounting Depth - 10 1/2

Vas - 280 L Spl - 91.8 dB 1W/1M Weight - 40 pounds

Qms - 4.962 Rms - 1500 W Voice Coil Diam - 3 inch aluminum

Qes - .334 Xmax - 25 mm one-way Voice Coil - Dual 2 ohm

Qts - .318 Price - $350 Cone - Paper/Kevlar fibers

Le - 1.2 mH



Home Audio ~ 8-10 Cubic Feet / 18-20 Hz tuning

Car Audio ~ 6 Cubic Feet / 28-32 Hz tuning



Strange, the upper right reports an Fb of 20Hz, but the graph shows it to be around 32Hz. Did you update the graph after you entered your parameters?

Not sure what dip you mean.
 

·
Registered
Joined
·
861 Posts
The Fb (tuning frequency) isn't 20 Hz, it's more closer to 32 Hz. You should update the graph...


And there WILL be a dip at Fb in driver's response. That's because the port will make the most of the output there. You should look at the dark blue line, that's the combined response.
 

·
Registered
Joined
·
3,652 Posts
Discussion Starter · #6 ·

Quote:
Originally Posted by Jack Gilvey /forum/post/0


Strange, the upper right reports an Fb of 20Hz, but the graph shows it to be around 32Hz. Did you update the graph after you entered your parameters?

Not sure what dip you mean.

I may have done it wrong. Can you do the same and let's see what you come up with?


The dip is "SPL produced by the driver".


I'm still learning this modeling stuff.
 

·
Registered
Joined
·
3,652 Posts
Discussion Starter · #8 ·

Quote:
Originally Posted by Richard Mayer /forum/post/0


The Fb (tuning frequency) isn't 20 Hz, it's more closer to 32 Hz. You should update the graph...


And there WILL be a dip at Fb in driver's response. That's because the port will make the most of the output there. You should look at the dark blue line, that's the combined response.

Thanks for clarifying that Rich. I get it now.
 

·
Registered
Joined
·
6,294 Posts
I think the only thing you didn't do is hit "Update graph".As Richard mentioned, the driver's dip is just the damping of its motion/output as the port takes over. The SPLTotal is the actual FR.

Your 260L box tuned to 20Hz looks pretty good, won't let me attach right now.
 
1 - 15 of 15 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top