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Old 19th March 2005, 12:23 PM   #1
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Question New enclosures for Logitech speakers

Before I get into real speaker building, I'd like to get started by modifying my current Logitech Z-560s (precursor to the Z-680s) by building new enclosures for the satellites and sub. While I've got speaker building books on the way, I'm too impatient to wait and design my own enclosure. At this point I'm looking at reducing this enclosure

lClick the image to open in full size.
http://home.hetnet.nl/~geenius/Solo103.html

by 25% in all dimensions because the Logitech uses 3" TB drivers instead of a 4" Fostex. Knowing nothing of speaker design, is this right? Or is enclosure size non-proportional to driver size? I'm open to any suggestions, including ones regarding sub box because I've no ideas yet where to go with it.
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Old 19th March 2005, 08:56 PM   #2
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No it doesn't work like, there is quite a bit of basics to learn. At the very least learn about the Thiele Small parameters and 3 main ones Vas, Qts & Fs

However heres a quick way of getting your feet wet.


A 3" Tang Band, such as this one

Click the image to open in full size.

Will work fairly well in 0.25 cu ft enclosure with 2 1"x4" ports.


You can buy all this stuff from PartsExpress premade.

PE Enclosures, look at the 0.25 cubic feet ones. ($110 per pair)

The 1" ports. Already 4" long. ($0.50 each 4 total)

2x Bindng posts pairs. ($14 for 2 pairs)

So there you go, $150 and minimal work time. Cut hole for speaker, holes for ports, assemble.
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Old 19th March 2005, 10:28 PM   #3
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I've taken my logitechs (Z-560) apart to do extensive work on them..and I'd swear it's the same dang driver as the tang-band. Identical. No guff.

Edit: Oh. Silly me. we's know's that already. duh.
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Old 20th March 2005, 12:05 AM   #4
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Quote:
Will work fairly well in 0.25 cu ft enclosure with 2 1"x4" ports.
That seems rather large for any of the W3 series drivers. For example; the largest enclosure I've seen for the W3-871S is .16 cu. ft with a single 1" port, 1" long.
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Old 20th March 2005, 01:10 AM   #5
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It's not so much the construction as it is the design of the enclosure that I'm unsure about. I can build whatever enclosure I need pretty easily. $110 for two basic boxes is excessive to me. So I guess I'll be waiting for the books to arrive unless someone has a suggestion for a good enclosure for a 3" driver.

The stock Logitech enclosures are .06 cu. ft. The enclosure I was looking at was roughly .40 cu ft, which is huge by comparison (I hadn't checked the specs on it previously). Anything wrong with just scaling it down to around .10 cu ft?
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Old 20th March 2005, 01:36 AM   #6
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The 3" Tangbands work well in enclosures ranging from .11 cu. ft. (ala the CSS Elf 1.0) to .16 cu. ft. and in both cases the port should be 1" diameter and 1" in length.
This thread might be of interest.
TQWT for the TB W3-871S
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Old 21st March 2005, 03:46 AM   #7
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Now this is a different 3" driver, but it looks like it replaced the Tang Band design he used to have:

http://www.zaphaudio.com/audio-speaker18.html

How does that enclosure look? 0.12 cu ft is in the range I need.
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Old 21st March 2005, 12:17 PM   #8
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Looks good to me. If you intend to put your Logitech/Tangband driver in that box I suggest you add a 1" port. You don't need a port tube. The thickness of the material will provide the correct port length.

BTW, after John posted his review of small drivers I built this one.
http://www.timn8er.com/Aurasound%20NS3.htm
Nice little driver.
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