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 Post subject: My cheap speaker project
PostPosted: September 20th, 2022, 2:07 am 
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Joined: June 22nd, 2013, 11:00 am
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Tom has the "Eggs". Maybe, I should call them the "Toms". Tom gave me those Optimus/Lineaum bookshelf speakers. One of those funky tweeters was blown, and one of the woofers disintegrated. So, I started from scratch. I am using just the cabinet. They are not going to be great, but they will work.

I replace the woofers with some drivers I had. I didn't have the exact size drivers I needed, so I used something smaller that happen to work using a little ingenuity. The driver isn't screwed on, it is clamped on. I wish I could have the proper sized drivers. I don't really have the bass.

I used some ingenuity to take some tweeters and openly suspend them facing forward using the top grill mounts, as well as securing the wires before it goes into the cabinet. They look the part.

I wish I had some two-way passive crossovers to experiment with it. Right now, the drivers are wired in parallel without any crossover so the rear panel is removed with the wires sticking out.


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PostPosted: September 22nd, 2022, 7:35 am 
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Joined: December 14th, 2013, 2:19 pm
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How about some pictures?


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PostPosted: September 22nd, 2022, 7:49 am 
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Joined: February 28th, 2013, 1:19 pm
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Running a tweeter with no crossover is a recipe for blowing a tweeter. Just put a cap inline with the tweeter. For a 4000Hz crossover point using an 8 ohm tweeter, this is a 5uF capacitor. There are plenty of simple crossover calculators online if you do a Google search.

David


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PostPosted: September 22nd, 2022, 9:40 am 
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Tweeter is a Vifa 6 ohm. It has a 5 hole mounting, but only two are used to suspend it.

Don't remember what the other driver was. I would have to disassemble the cabinet to look.


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PostPosted: September 22nd, 2022, 4:10 pm 
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So I guess that's a "no" to pictures. I was really hoping for pictures.


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PostPosted: September 22nd, 2022, 5:49 pm 
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Pictures to come.

I don't work on this everyday. I installed the mid-range driver long ago, and recently figured out how to mount the tweeter since these cabinets are unusual to begin with.


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PostPosted: September 23rd, 2022, 12:12 am 
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The mid-range driver is a Vifa 8 ohm.


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PostPosted: September 23rd, 2022, 12:20 am 
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Vifa 6 ohm tweeter, Vifa 8 ohm mid-range.


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PostPosted: September 23rd, 2022, 8:32 am 
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Looks good. No surprise that there is no bass there.
If you can cut the lower edge of the tweeter and mount it closer to the woofer, that will help with phase near the crossover point.
But that tweeter will die a horrible death if you don't get a series capacitor installed to it.
You could fill those voids in the cabinet structure with a pour-in compound, that will tighten up the sound, reducing resonances.
A separate woofer in a different cabinet will be the best bet for real bass.

Good job!

Stuart


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PostPosted: September 23rd, 2022, 8:42 am 
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Joined: July 8th, 2016, 4:34 pm
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If you don't use a capacitor with the tweeter make sure the dc offset of the amplifier driving it is in the millivolt range.


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