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Multi-Way Conventional loudspeakers with crossovers

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Old 12th February 2014, 10:45 AM   #1
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Default Inexpensive two ways.

This the second pair of inexpensive 2-ways I have built. This time 18mm MDF, 6.5" woofer\mid and Isodynamic ribbon tweeter and ported. Simple 12db Xover at 2,350Hz. Minimal dampening and the "Houston" finish. I called them VoXDeuX65. Are they better than the smaller VoXDueX with 5" driver and silk dome tweeter? Yes!

They are sitting atop my stereo sub-woofers.
Attached Images
File Type: jpg VX65_I.jpg (157.9 KB, 191 views)
File Type: jpg VX65_II.jpg (162.9 KB, 186 views)
File Type: jpg VX65_III.jpg (165.1 KB, 184 views)
File Type: jpg VX65_IV.jpg (157.6 KB, 181 views)
File Type: jpg VX_V.jpg (155.5 KB, 177 views)
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Old 12th February 2014, 11:11 AM   #2
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Very nice!

What's the paint finish?
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Old 12th February 2014, 11:32 AM   #3
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Originally Posted by fatmarley View Post
Very nice!

What's the paint finish?
This what I call the "Houston" finish. First, after prep, a heavy primer, first coat very wet then second with the roller with no more paint, a dry roller. With the top coat once more a very wet coat then go over 3 to 5 times with no more paint on the roller. You have tease out the roller stippled finish. All timber veneer and wood finishes and especially piano finish are the worse for audio. The sound just reflects off a perfectly shiny and reflective surface. With my soft paint take three months to dry), heavily stippled finish the surface absorbs, and scatters the radiating waves. This leads to very low colouration in the sound a problem all speakers with a shinny baffle board suffer from.
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Old 12th February 2014, 01:14 PM   #4
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I read somewhere that Bowers and Wilkins put dimples or something on their baffles (or was it on the drivers themselves?) to try and improve the sound.
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Old 12th February 2014, 01:22 PM   #5
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I know B&W have been putting dimples on their port tubes for years.

It is the same principle that is behind the dimples in golf balls: Create many very small turbulences to avoid creating one big one.
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Old 12th February 2014, 01:27 PM   #6
Mihkus is offline Mihkus  Estonia
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Originally Posted by Charles Darwin View Post
I know B&W have been putting dimples on their port tubes for years.

It is the same principle that is behind the dimples in golf balls: Create many very small turbulences to avoid creating one big one.

Mythbusters made golf ball car that was 11% more eficient than ordinary car.

Nice speakers, mat black metal paint and paint roller?
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Old 12th February 2014, 01:41 PM   #7
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It is the same principle that is behind shark skin so B&W, Mythbusters and golf balls are only about 400 million years behind the curve Nature plotted. ;-)
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Old 12th February 2014, 05:14 PM   #8
SS4927 is offline SS4927  Canada
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Great job on everything! I would be proud to have those in my living room. The finish reminds me of "crinkle black" automotive finishes. I achieved something similar by applying several thin coats of a flat black with a fine foam roller giving it a day in between to set up before following coat(s) for durability purposes. Several people asked me who sprayed it and complimented at show and shines. By being patient and teasing paint out of the roller avoiding over loading it. The time it is allowed to tack while applying is partly how I controlled the degree of texture. And how much paint I loaded into the roller. A more aggressive roller is another way. Imperfect finishes like these turn out looking quite perfect and are not nearly as difficult to achieve as there shiny counterparts

I agree with your comments on reflection. Speaking of that I applied acoustic carpet intended for audio motion (if you didn't happen on my other post). The improvement was pretty substantial. The more I listen the more I can appreciate what it did. Not the prettiest finish by any means and likely to have a very low acceptance factor by some. But if your a purist and care more about the sound give it a try sometime. Even if for a set of shop speakers or other place significant others tend not to frequent.

This has me pondering the thought of feathers (not likely lol)
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Old 12th February 2014, 09:07 PM   #9
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Originally Posted by Mihkus View Post
Mythbusters made golf ball car that was 11% more eficient than ordinary car.

Nice speakers, mat black metal paint and paint roller?
It's actually just house paint but a premium brand and supper thick. Even the primer\undercoat is super thick. I tease-up the undercoat also.
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Old 12th February 2014, 09:12 PM   #10
sreten is offline sreten  United Kingdom
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Originally Posted by mhouston View Post
Simple 12db Xover at 2,350Hz.

Hi, there is nothing ever remotely simple about a proper 2 way x/o, rgds, sreten.

I suspect they are nowhere near as good as they could be with detailed design.
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Last edited by sreten; 12th February 2014 at 09:21 PM.
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