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Old 13th October 2013, 10:01 PM   #1
shlshh is offline shlshh  United States
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Default Unusual Qts Value?

I'm brand new to speaker design and am trying to make a full-range pair on the cheap (investment of <$100 hopefully!).

The extent of my design plan is to choose full-range drivers and plan an enclosure around them based on the Qts and equivalent volume parameters (nothing too ambitious for the first project).

The two drivers which I was looking at are
The Madisound Speaker Store
HiWave BMR12 Compact 2" Full-Range Square Speaker 12W 8 Ohm 299-208

On the first driver, I as very surprised at the Qts value on the spec sheet -- 1.45! It seemed quite high, and gave me some funky results when for box volume. What gives? I thought Qts typically were less than 1?

As a preemptive reply to any suggestions of moving up to higher-end drivers... I realize that my objective of using small and cheap full-range drivers will inevitably prevent the end product from having high quality sound. As my first project I'm not too concerned with this, and am thinking of this pair as a low-entry learning opportunity. The projects I've seen on this site are truly inspirational and I hope to someday reach that quality. Thanks in advance for any help!
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Old 13th October 2013, 10:07 PM   #2
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For less than $100 you can afford more expensive drivers.... both of these are really mid-tweeters

dave
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Old 14th October 2013, 03:46 AM   #3
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Hehe, the work time is more expensive what 10 pc each !!
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Old 14th October 2013, 04:52 AM   #4
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This is a good (world classic) starter. Post your project pics (for our enjoyment...)
Fostex FF85WK 3" Full Range The Madisound Speaker Store
8?????????Fostex FF85WK????California Girls?(Papa Doo Run Run) - YouTube
??????FF85WK?????DR-07II?????????? - YouTube
FF85WK - YouTube
http://spc.jpn.org/zumen/MS-802T-mk4_zumen.jpg
http://spc.jpn.org/zumen/max85_zumen.jpg

Quote:
The projects I've seen on this site are truly inspirational and I hope to someday reach that quality.
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Old 14th October 2013, 05:30 AM   #5
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Quote:
Originally Posted by Inductor View Post
T
Fostex FF85WK 3" Full Range
One of my favorites. Will produce better, deeper bass than eother of the 2 originally posted but still bass shy.

My personal uFonkenSET with FF85wKeN

Click the image to open in full size.

dave
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Old 14th October 2013, 06:53 AM   #6
DrBoar is offline DrBoar  Sweden
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A 2" will have no real bass what so ever so having a high Q giving at a peak in midbass lower midrange improves the thin bright balance it otherwise would have. The highly respected BBC monitor LS3/5A had no bass below 80 Hz but a peak in the octave above that to give the impression of bass, so in some setting it is a valid design option to use even if it is not the purist approach.
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Old 14th October 2013, 04:33 PM   #7
IG81 is offline IG81  Canada
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FF85WK is a cool little driver. Personally, I prefer Tang Band W4-1320SIF, which is priced a tad lower to boot. Either driver should be able to have a pair of simple vented enclosures fit in a single 0.5" BB-ply handy-panel from Home Despot. Add some decent connectors and wire and you're not over the budget by very much, assuming you already have all required tools, workbench and glue at home...

IG
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Old 14th October 2013, 07:05 PM   #8
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>>> My personal uFonkenSET with FF85wKeN

Gorgeous!

Both the Fostex and TB suggested are great. Any 3" TB in a sealed box seems to work really well. You can add a subwoofer later to improve the bass.
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Old 14th October 2013, 07:49 PM   #9
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Quote:
Originally Posted by Godzilla View Post
Gorgeous!
An example of the fine woodwork Bernie does. These are solid Yew.

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Old 14th October 2013, 07:53 PM   #10
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Default silly-little-buggers drivers

Quote:
Originally Posted by planet10 View Post
One of my favorites. Will produce better, deeper bass than eother of the 2 originally posted but still bass shy.

My personal uFonkenSET with FF85wKeN
Another driver to consider with F3 ~40Hz, Aurasound NS3-193-8A 3" Fullrange Price: $23.00 (each) Madisound. (Mid. pic)
That's all for today (dinner).

More references:
Dayton Audio ND91-4 3-1/2" Aluminum Cone Full-Range Driver 4 290-224
http://www.daytonaudio.com/media/res...tions-8418.pdf
Tang Band W3-1878 3" Full Range Driver 264-902
http://www.tb-speaker.com/detail/1230_04/w3-1878.htm
http://www.madisound.com/store/manua...ns3-193-4a.pdf

DAYTON RS100S-8 and 4. Price: $28.85. Iinteresting silly-little-bugger driver (pic right).
Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm 295-378
http://www.daytonaudio.com/media/res...ions-46166.pdf
http://www.daytonaudio.com/media/res...ions-47076.pdf

This one is interesting, might work as a good mid/tweeter combo for top frequencies in a 2-Way (woofer+midrange).
Eton Symphony 3" Midrange 3-400/A8/25 MG, Matched Pair Price: $245.95 (each)???? (pic left). The Madisound Speaker Store
Fountek FR88EX 3" Neodymium Full Range Driver 296-719
The Madisound Speaker Store
Attached Images
File Type: jpg eton 3-400_a8.jpg (62.1 KB, 170 views)
File Type: jpg aurasound ns3-193-8a.jpg (99.5 KB, 168 views)
File Type: jpg Dayton Audio RS100.jpg (332.2 KB, 166 views)
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