Bipolar MLTL with 5,25 inch car coax - diyAudio
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Old 17th September 2008, 08:15 PM   #1
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Default Bipolar MLTL with 5,25 inch car coax

I have just finish my first bipolar MLTL speaker.
I just wanted something cheap to my computer. Bipolar because i want a "big" sound, deep soundstage to my gaming.

Click the image to open in full size.

In the picture you can see the rear-driver through the hole. The other driver laying on top.
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Old 17th September 2008, 08:17 PM   #2
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Click the image to open in full size.

The cloth a third down in the box is to hold the stuffing.
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Old 17th September 2008, 08:21 PM   #3
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Click the image to open in full size.

The first speaker is playing the Wall by Pink Floyd.
A 25 dollar-speaker. Sound realy good considering the amount of cash.

The speaker is 47 x 8,8 x 8,8 inch (120 x 22,4 x 22,4 cm) and built out of half inch particleboard. Did i say it was a cheap speaker. Real low budget.

Im going to builöd the other speaker during the next weekend. I need a stereopair.
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Old 17th September 2008, 08:32 PM   #4
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Click the image to open in full size.


I dont belive in all the peaks and stuff above 160 Hz. the port and drivers are spaced to far apart. A normal bassreflexbox will model as badly in Hornresp to, but never seem to sound as bad as that would indicate.

i should have made the box 15 cm shorter, but the pieces had allready been cut this way.
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Old 17th September 2008, 09:22 PM   #5
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With no damping ripple is to be expected.

dave
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Old 17th September 2008, 09:26 PM   #6
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True!

I have some damping, but did not include that in the sim.
I will play with the amount of stuffing once i have both speakers up and running.

Johannes.
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Old 18th September 2008, 03:46 PM   #7
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Quote:
Originally posted by Circlomanen

I dont belive in all the peaks and stuff above 160 Hz. the port and drivers are spaced to far apart.
Yeah, HR seems to really exaggerate HF 'ripple'. FWIW, here's a half space sim using MJK's software:

GM
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File Type: gif dual 5.25' mltl - (mjk).gif (6.9 KB, 130 views)
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Old 18th September 2008, 03:50 PM   #8
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BTW, for my records, which brand/model driver is this?

Do you plan to leave the rear driver tweeter connected? Or.............?

FYI, if you use expo sections you can sim a constant cross sectional area (CSA), though there's no response difference:

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File Type: gif dual 5.25' mltl (gm) - specs.gif (13.2 KB, 106 views)
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Old 18th September 2008, 10:30 PM   #9
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That's definitely the biggest "computer speaker" that I've ever seen.
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Old 19th September 2008, 03:29 PM   #10
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Quote:
BTW, for my records, which brand/model driver is this?
The are named Boschmann. I buy them at Clas Ohlsson.'
http://www.clasohlson.se/Product/Cat...;251206;251122

The link is for the only place i have ever seen the driver.

I dont have any other info about them.

Thank you for simming them in MJK´s software.
it looks muck better.
Since i dont have any reliable specs i just try what looks good enough.

Quote:
Do you plan to leave the rear driver tweeter connected?
Yes. The idea is to get as big soundstage as possible. i have been playing som Half Life 2 with this speaker, and its sounds wonderful. It realy feels like im running around in an old cementary shooting zombies.

Quote:
if you use expo sections you can sim a constant cross sectional area
Thanks.

Johannes.
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