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Old 15th October 2012, 10:38 PM   #61
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by nelnar View Post
Almost done.
Does anyone have a schematic for a crossover of a subwoofer 1way, this up considering the potency 300/400w rms 3ohms.
Hi Nelnar,

Passive or active?

b
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Old 16th October 2012, 12:49 AM   #62
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by nelnar View Post
I'll do an experiment:
glass wool in parallel, and in between, blanket synthetic.
Perfect lining using felt..
..But it looks like your 'synthetic blanket' is folded(shouldn't as the bend will be too dense, thus attenuating to much also if the 'blanket' is compressed) and is filling up the entire left out volume in the picture: DSC02895.jpg,~50% is enough.

The Glass-wool looks also denser than necessary:You may have to remove this if the box becomes over-damped.

Prior to gluing the box-panels air-tight:
Use wood-clamps and do a listening test(or perform a measurement) to find out the sonic impact, if necessary to adjust the filling.

b
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Old 16th October 2012, 03:41 AM   #63
NWCgrad is offline NWCgrad  United States
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Quote:
Originally Posted by bjorno View Post
Prior to gluing the box-panels air-tight:
Use wood-clamps and do a listening test(or perform a measurement) to find out the sonic impact, if necessary to adjust the filling.
b
That is a great idea, the amount of filling in these types of designs seems really important. I had been contemplating making removable panel to adjust, but this method may work better.

Nelnar, nice build I hope someone provides a good schematic for you. I am planning on using a miniDSP but I will be watching to see what the experts recommend.
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Old 16th October 2012, 01:08 PM   #64
nelnar is offline nelnar  Brazil
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Default Many thanks for your patience!

BJORNO - really did a test this way and the sound hardly ran through the duct.
Then, the whole blanket acrylic removed, leaving only the glass wool.
But it certainly will not seal before doing all the listening tests.
So far so thankful my friend.
A big hug!

NWCgrad - Hello my friend, welcome to post.
Look, do something yourself (DIY) is very enjoyable, but you have to devote to your job and mainly rely on friends to whom I could find here.
Not wanting to pull Bj÷rn÷ bag, but if it was not for him and his dedication, I would not have gotten this far!
As the blanket inside, I put too much. Now I am testing without the acrylic blanket, only with layers of glass wool.

Last edited by nelnar; 16th October 2012 at 01:14 PM.
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Old 16th October 2012, 01:23 PM   #65
nelnar is offline nelnar  Brazil
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On the issue of the amplifier.
Well, it's hard to find an amplifier with output of 3 ohms, I'm considering getting a automotive module as this model below. Considering also the value is low. Here in Brazil U.S. 110.00.

http://www.stetsom.com.br/eng/Detalh...=8364&cat=4639

Well, in this case, I will have to acquire a source of 12v to 14v with 50 amps.

I thought this fountain, where the seller assured me that will supply the amplifier.

http://www.aliexpress.com/item/600W-...621228646.html
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Old 20th October 2012, 11:54 PM   #66
nelnar is offline nelnar  Brazil
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Default regulate the frequency cutoff?

Hello friends.
Now is the amp, but the power supply does not!
As I was anxious, I called the module in a car battery yourself, of course, with a safety fuse.
The source was not from that link posted above, but this one below:

Wholesale Product Snapshot Product name is Free shipping,New 600W 12V50A Switching Power Supply For LED Strip light,220V/110V AC input,12V output +more DHL Free shipping

************************************************** ******************************
Below is the photo of the tests.
************************************************** *******************************

reminding the specifications of the subwoofer:


POT╩NCIA RMS: 300-400watts
IMP╩DANCIA: 6+6ohms
SENSIBILIDADE: 88db

Revc=2.300 Ohm

Levc=889.758u H

Fo=28.582 Hz

Sd=53.093m M▓

Md=44.000 g

BL=9.648 TĚM

Qms= 6.989

Qes= 0.532

Qts= 0.494

No= 0.440 %

SPLo= 88.5 dB

Vas=103.554 Ltr

Cms=258.705u M/N

Mms=119.852 g

Mmd=105.783m Kg

Xmax= 13mm


* Based on the specifications of the subwoofer, which would cut the correct settings on the amplifier STETSOM venom v.600 2ohms?

High pass filter?

Low pass filter?
Attached Images
File Type: jpg DSC02916.jpg (770.5 KB, 53 views)
File Type: jpg DSC02917.jpg (644.1 KB, 55 views)
File Type: jpg DSC02918.jpg (510.7 KB, 52 views)
File Type: jpg DSC02919.jpg (367.6 KB, 47 views)

Last edited by nelnar; 21st October 2012 at 12:03 AM.
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Old 21st October 2012, 05:52 AM   #67
nelnar is offline nelnar  Brazil
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Friends, below is the youtube link of tests do subjornobass.

SUBJORNOBASS - YouTube
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Old 21st October 2012, 07:59 AM   #68
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Nice video! thank you.
What do you think of the result?
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Old 21st October 2012, 09:02 AM   #69
epa is offline epa  Netherlands
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nice project.
how does it sound?
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Old 21st October 2012, 04:14 PM   #70
nelnar is offline nelnar  Brazil
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For now, this testing phase, precise fit lining, making closing the lid, because the audio output should be in 96mm. But, I'm liking what I'm hearing. Very good!
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