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Help in building tiny inexpensive full range computer speaker please?
Help in building tiny inexpensive full range computer speaker please?
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Old 19th June 2016, 04:04 AM   #1
iMonkeyDaddy is offline iMonkeyDaddy  United States
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Question Help in building tiny inexpensive full range computer speaker please?

Im new to speaker building and wish to make a pair of very inexpensive and very small computer speakers. Id like to keep it simple with a single full range driver, probably 2 3 inches diameter. Cabinet size: as small as possible, preferably no bigger than 6 x 5 x 7 inches or 2 liters volume. Cost: something like $75 max. None of that is carved in stone, of course, except that I dont want a subwoofer.

I realize that it wont be true audiophile but, as a first build, maybe a good place to start. As I look at articles and read specs and blogs Im getting more confused rather than less. Can someone help me sort this out?

After looking at many speaker specs, especially wanting smooth frequency response with some low frequency extension, I was thinking about the 3 inch Aurasound NS3-193. I was also thinking about the Tang Band W2-1803S 2 inch and the Fountek FE85 3 inch. The Aurasound NS3 with a Peerless 3.5 inch passive radiator looks promising in a 2 liter enclosure.

This is where the endless questions start to pop up. Im using Jeff Bagbys woofer box calculator and Im not sure if how to optimize it.
The calculator shows a big hump in SPL in the low frequencies do I need to address that?
Do I need a high pass filter?
Are there similar tiny cabinet dimensions that would be better?
How do I decide on the target Fb?
Would a larger passive radiator work better?

I was hoping to put the amplifier board inside of the cabinet, too. I have a TPA3116D2 board with 50 watts/channel. That may be one wish too many.

Any help would be much appreciated!
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Old 19th June 2016, 04:47 AM   #2
zman01 is offline zman01  Bangladesh
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Help in building tiny inexpensive full range computer speaker please?
For a 2-2.5 liter box, another option you can take a look at is the Fountek FR88EX:

A few plans:

Martello enclosure for FR88EX

The Fountek Five for FR88ex

Discussions on some filters:

Fountek FR88-EX
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Old 19th June 2016, 04:55 AM   #3
jfetter is offline jfetter  Costa Rica
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i am sure you can get there with full labyrnth.
its the only enclosure type that can drop F res.( several texts say this)

I built one in 1973 and found the sound fantastic.
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Old 19th June 2016, 04:56 AM   #4
planet10 is offline planet10  Canada
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Help in building tiny inexpensive full range computer speaker please?
Around here there are a lot of uFonkenWK. They are 2 litres and the plans can be found here: Frugal-phile | Box Library / Fostex. It will (slightly) exceed your budget but they are really quite good. Their are also some slightly larger ones (all part of the paid plan-set).

Here a set of the earlier uFonken for the FF85k (differs only in the width of the vent spacer)

Click the image to open in full size.

For a 3" the little Aura is one of the most extended on the bottom… 2 litres is really too small to get a decent 2 litre reflex. Sealed they have a slight, but acceptable, bump and an F10 below 60 Hz. This is how we used ours. It is more coloured and isn't capable of the same level of detail as the FF85wk but costs about half.

FE83 also doesn't at all like a reflex that small, sealed F10 just over 80 Hz. Here are 5 enclosures we did for the FR88ex which work OK for the FE83. The Fountek Five for FR88ex

Plenty of options, i'm sure others will chime in.

dave
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Old 19th June 2016, 05:02 AM   #5
planet10 is offline planet10  Canada
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Help in building tiny inexpensive full range computer speaker please?
Quote:
Originally Posted by jfetter View Post
i am sure you can get there with full labyrnth.
There are Woden Baby Labs (labyrinths) for both the FF85wk and the NS3 but they are larger than 2 litres by quite a bit.

dave
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Old 19th June 2016, 10:51 AM   #6
sayrum is offline sayrum  Germany
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Hey
take a look: Vildeapel

If you have an Ikea and can source the Dynavox DY103/9A your good to go. In my humble opinion the vildapel works great nearfild with good bass and a smooth finish allready "built in".


Regards
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Old 19th June 2016, 01:57 PM   #7
xrk971 is offline xrk971  United States
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Help in building tiny inexpensive full range computer speaker please?
For a compact speaker circa 2L you need a driver with certain TS parameters that will allow a lower tuning in a smaller box. Forget about large Vas high Qts drivers unless you want to go sealed and have bass starting to falloff starting 200Hz.

Look at Faital Pro 3FE22 8ohms. It is 91dB sensitive and has ability to produce some bass in a very tiny bass reflex. Here is a quick and dirty prototype I made out of foam core at 1.5liters. With a small 25mm vent and a 1mH and 6.8R BSC the sound is quite nice and balanced with about 80Hz F3.

Here it is being powered by a 1.6w class A headphone amp. It is plenty loud for a desktop speaker.

Click the image to open in full size.
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Old 19th June 2016, 04:07 PM   #8
Jerms is offline Jerms  United Kingdom
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Dayton ND65-4?

Could try a BR or a TL to get decent response to 60hz or so. I've run a sim in the TL software based on the Woden Redeye. With 40-20-10cm2 in a 3x27cm length gets response to 60hz or so.

Simpler than that, a WinISD sim predicts tuning of 60hz in a 1.75L box.

If it wasn't for computer speakers you wouldn't do it though. Power handling is "low" before risking overexcursion. Though with a computer, you can play with DSP to implement a subsonic filter.

Last edited by Jerms; 19th June 2016 at 04:32 PM. Reason: Add WinISD stuff.
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Old 20th June 2016, 03:24 AM   #9
iMonkeyDaddy is offline iMonkeyDaddy  United States
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Wink Thanks for the advice. May i have more? lol

Thanks guys for the great info! I’ve been poring through it all day.

I see myself building 2 sets (or more) of computer speakers in the near future. A less expensive (and smaller) pair for at work and a better (probably larger and more expensive) pair for home.

Planet10, can you describe the coloring of sound in the Aura NS3 sealed? 2 liters? Tolerable?

I really like the look of the Martello (with the Fountek FR88EX) and the uFonken (with the Fostex FF85K).
I take it from your comments that a less expensive driver like the Fountek FE85 likely wouldn’t compare to the more expensive drivers?
Is it possible to scale down the size slightly?
Would substituting the Fountek FE85 be worth considering?

Sayrum, I love the look of the Vildeapel but my german sucks. Can you give me any more info on it?

XRK971, thanks for doing a mock up. I hate to be dumb but when you say “a small 25mm vent and a 1mH and 6.8R BSC the sound is quite nice and balanced with about 80Hz F3” what do you mean? I don’t understand the terminology mH and R BSC.

Jerms, sorry but I’m a newb: what do you mean by “40-20-10cm2 in a 3x27cm length gets response to 60hz or so”?

Do all of these require high pass filters? Can any of these go without electronics?

Current prices in US:
Fostex FF85WK $ 43.55
Fountek FR88EX $ 37.80
FaitalPRO 3FE22 $ 32.00
Aurasound NS3-193 $ 19.90
Dayton ND-65-4 $ 19.30
Fountek FE85 $ 11.20
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Old 20th June 2016, 05:08 AM   #10
xrk971 is offline xrk971  United States
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Help in building tiny inexpensive full range computer speaker please?
Baffle step correction circuit. Take a 1milliHenry inductor and parallel it with a 6.8ohm or 5ohm resistor (adjust to taste) and take that unit (called a BSC circuit) and put it between the amp and the +terminal of the driver. It basically provides a slight attenuation of the high frequencies above 900Hz that will level match the bass and the treble for a balanced sound. Without it, the speaker will sound shrill. The term baffle step refers to the loss of bass below the frequency dictated by the baffle width. An infinite baffle (a wall) had no baffle step loss. You should read up on BSC.
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