I did a simulation, and sharing the graphs. Please give your valuable comments

[Naveenbnc]

Hi Guys,
Recently I did a simulation and I'm sharing the graphs. (I'm a beginner, so mistakes are expected)

Those are for an 8" 60W BS, with a volume around 25L.

I'm getting the following values:
47HZ @ -3dB
33HZ @ -12dB
108dB-Spl/Hz @ 1M (custom amplitude)

Air vent velocity less than 17m/s
And cone displacement within Xmax

Phase responce & Group delay, I don't know how to judge them.

Please share your valuable comments and suggestions. Critics are welcome. They are the real teachers


.

 

[Naveenbnc]

 

[Naveenbnc]

 

[diyaudio]

If you have good amount of Xmax, then lower tuning to about 35 Hz

 

[Naveenbnc]

Xmax is 4. So I can't go any further. Is there any other way??

 

[ONB]

Hi Naveen,
Can you share the drivers ts parameters , I can plot it and check ...

Regards
ONB

 

[Naveenbnc]

Sure
Il go home and share

 

[Naveenbnc]

IWAI 8" 8OHMS 60w DRIVER
"Title: Measured Parameters"
"Method: Fixed-Mmd (25.000 grams)"
"DCR mode: Measure (-0.38 ohms)"
"Area (Sd): 226.98 sq cm"
"QC-limits file: "
"Last setup file: C:\MLS2000\SPO4K.SET modified "

"Series resistance: 75.00 ohms"
"Stimulus level: 1.00 volts"
"SPLref reference impedance: 8 ohms"
"Large units (volume = liters, mass = grams)"

0.867 "RMSE-free Ohms"
39.573 "Fs Hz"
6.212 "Re Ohms[dc]"
49.359 "Res Ohms"
3.051 "Qms "
0.384 "Qes "
0.341 "Qts "
0.714 "L1 mH"
1.459 "L2 mH"
15.344 "R2 Ohms"
0.000 "RMSE-load Ohms"
43.454 "Vas(Sd) liters"
26.935 "Mms(Sd) grams"
600.532 "Cms(Sd) æM/Newton"
10.409 "Bl(Sd) Tesla-M"
91.387 "SPLref(Sd) dB "
0.044 "Rub-index "

 

[Naveenbnc]

I have space constraints. I cant make the box any bigger than 25L.

Within 25L volume it you simulate for a better performance, that would be awesome, and it would be a learning too

 

[Naveenbnc]

Hi Naveen,
Can you share the drivers ts parameters , I can plot it and check ...

Regards
ONB

Hi ONB, ....there is a correction.
The results shown in my first post are for 29L box. Not for 25L.

For 25L i have to live with the below:
50.4hz@ -3dB
32hz@ -12dB
The graphs, and other readings remain mostly same with slight variation.

Any better results if you can get with 25L box or lesser would be awesome.

 

[Naveenbnc]

Ok.... These are the box dimensions in mm.
254x400x370 (WxHxD)

Its a slotted port.
17mm height x 220mm width x 200mm deep.

(Since it is a slotted port, the width is decided by the width of the box - thickness of mdf on either sides)

 

[ONB]

View attachment 29739View attachment 29740

Hi naveen ,
your calculations are correct with -3db at 47hz , group delay looks good as well , how high are you crossing it over to the tweeters ??

 

[Naveenbnc]

Wow !! That's a great news because this is my first simulation