Uzu-10II Speaker

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Uzu-10II Speaker

Postby dsound » Wed Sep 11, 2013 9:20 am

I'm planning on building this speaker design pretty soon. It's unique in that the horn's opening is on the side of the speaker. Have any of you had an experience with this design? It's designed for 4" full-range drivers.

Here's where I found the design:
http://korva.web.fc2.com/bluedrop/produ ... -102d.html

Here's a pic of a project that someone else completed:
Image
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Re: Uzu-10II Speaker

Postby IceFyre13th » Wed Sep 11, 2013 12:07 pm

上記の部材は、MDF や シナ合板 その他、好みの材料をお使いください。
板の厚さは、12mm です。
上記の部材以外に必要なものは、
10cm口径のフルレンジドライバー、ターミナル、内部配線、吸音材、です。
Fostex や Tang Band の各種 10cmフルレンジ・ドライバーが適合します。
Fostex や Tang Band 以外のドライバーを使う場合は、
13番の部材に空ける穴の大きさを変える必要があるかもしれません。
ターミナルは、右上の画像のようなタイプの物を使用してください。
2台作る場合は、左右対称 に作ってください。

Translated means,

Member above, please use the article plywood and other MDF, the material of choice.
The thickness of the plate is 12mm.
Required for the members other than those listed above,
Full range driver of 10cm diameter, terminal, internal wiring, it is sound-absorbing material,.
Various 10cm full-range drivers of Tang Band and Fostex will fit.
If you use a driver other than the Tang Band and the Fostex
,
There may be a need to change the size of the hole that empties into member number 13.
The terminal, please use one of such type of image in the upper right corner.
If you make two, please make symmetrically.

Italics is the important stuff, that box will work with those speakers. Other speakers will mean you need to recalculate the tuning of the box to sound right.

Reverse the Speaker baffle side and you will have one with the horn opening to the left, and another with the horn opening to the right.....then figure out if the speaker sounds better with the horn aimed at a wall or to the center of the room.
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Re: Uzu-10II Speaker

Postby EWBrown » Wed Sep 11, 2013 2:40 pm

"Member #13" is the baffle / panel upon which the speaker is mounted, 10cm / 4 inch speakers, other than Fostex and Tang Band will require different sized mounting hole diameters.

If one were to make the spiral in an octagonal, rather than square form, which would require much more difficult and complex wood working (lots of accurate 45 degree angle cutting), then the horn loading should be improved.

I would SWAG that the design could be physically scaled up for 6 or 8 inch (150 or 200 mm) FR drivers.

Just my dos pesos' worth...

/ed B
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Re: Uzu-10II Speaker

Postby IceFyre13th » Thu Sep 12, 2013 11:13 am

Speaker design, really speaker enclosure design, is NOT just slapping a speaker in a box and thinking it will work......

Transmission Line enclosures can be the best sounding, but are one of the hardest to build right. here is a site on transmission line speaker design http://www.quarter-wave.com/

Every speaker has different characteristics, you have to know the Thiel-Small data of the speaker to start. http://en.wikipedia.org/wiki/Thiele/Small

Then there is the "black magic" that comes with building speaker enclosures, tricks like building the enclosure for the environment it will be used in (invert the rooms frequency response into the math used to calculate the speaker response.....for example, no I do not expect many to understand this), how to eliminate rear sound reflections from effecting the speaker cone, how and or when damping material should be used, the "golden rule"........and many more.

I have been doing this for decades (car, home and professional audio design engineer), and yet every "box" I build I learn something new........but I still come across too many people who think that every 10" driver needs the same 1 cubic foot sealed box, or all I need to do is "scale up" the design of box X for my bigger / smaller speaker.

That being said, if the OP knows exactly what driver (speaker) is going to be used, and can give me the room dimensions the final build will be used in I will be more than happy to help design the enclosure for them (or anyone else)
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Re: Uzu-10II Speaker

Postby dsound » Thu Sep 12, 2013 8:44 pm

Wow, thanks for the reply! I chose this particular design because I wanted to build a simpler horn enclosure that incorporates an efficient-full range driver.

I am going to use the Tang Band W4-1320SIF full range driver.

Here are the driver specs:

PRODUCT SPECIFICATIONS
Power Handling (RMS) 25 Watts
Power Handling (max) 50 Watts
Impedance 8 ohms
Frequency Response 75 to 20,000 Hz
Sensitivity 88 dB 1W/1m
Voice Coil Diameter 1"
Magnet Weight 18.6 oz.
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Re: Uzu-10II Speaker

Postby dsound » Thu Sep 12, 2013 8:53 pm

And thanks so much for the offer to design an enclosure! Maybe down the line I'll take you up on your generosity!
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Re: Uzu-10II Speaker

Postby IceFyre13th » Fri Sep 13, 2013 12:29 pm

http://www.parts-express.com/pe/showdet ... er=264-914


Tang Band W4-1320SIF 4" Bamboo Full Range Speaker

Tang Band's W4-1320SIF 4" speaker features a bamboo fiber paper cone with half-roll rubber surround. This optimally damped cone material is rigid, lightweight, and durable. The driver's 18 oz. ceramic ferrite magnet and underhung 1" voice coil do their part to ensure very low 2nd and 3rd order distortion. A machined aluminum phase plug improves high frequency performance, and a strong cast aluminum chassis maintains proper component alignment. Also available in a truncated frame version, the W4-1320SJF.

PRODUCT SPECIFICATIONS
Power Handling (RMS) 25 Watts
Power Handling (max) 50 Watts
Impedance 8 ohms
Frequency Response 75 to 20,000 Hz
Sensitivity 88 dB 1W/1m
Voice Coil Diameter 1"
Magnet Weight 18.6 oz.

THIELE-SMALL PARAMETERS
Resonant Frequency (Fs) 75 Hz
DC Resistance (Re) 6.3 ohms
Voice Coil Inductance (Le) 0.02 mH
Mechanical Q (Qms) 2.52
Electromagnetic Q (Qes) 0.42
Total Q (Qts) 0.36
Compliance Equivalent Volume (Vas) 0.18 ft.³
Mechanical Compliance of Suspension (Cms) 1.13 mm/N
BL Product (BL) 5.31 Tm
Diaphragm Mass Inc. Airload (Mms) 3.99g
Maximum Linear Excursion (Xmax) 3 mm
Surface Area of Cone (Sd) 57 cm²

MATERIALS OF CONSTRUCTION
Cone Material Bamboo Fiber / Paper
Surround Material Rubber
Basket / Frame Material Cast Aluminum
Magnet Material Ferrite

MOUNTING INFORMATION
Overall Outside Diameter 4.94"
Baffle Cutout Diameter 3.74"
Depth 3.24"
# Mounting Holes 4

BOX SIZE (MODELED WITH BASS BOX USING HIGH FIDELITY SETTINGS)
Sealed Volume 0.04 ft.³
Sealed F3 166 Hz
Vented Volume 0.10 ft.³
Vented F3 96 Hz

From that I went to an on line calculator:

DUAL FOLD ON-AXIS TRANSMISSION LINE ENCLOSURE CALCULATOR
By: DB DYNAMIX AUDIO
http://dbdynamixaudio.com/62/dual-fold- ... alculator/

The below is from the calculator with the speakers parameters input (more or less, I just did it quickly)

Conversions:

1 cubic feet 28.32 liters
1 inches 25.4 millimeters
8.85 sq. inches 57.09666 sq. cm
8.8
16.5 liters 0.582692001 cubic feet
25.4 millimeters 1 inches
57 sq. cm 8.83501767 sq. cm

Constants:

Temperature: 75 Degrees F
Speed of Sound: 1134.351066667 Feet/Sec.

Driver Specifications:

# of Drivers: 1
FS: 75 hertz
QTS: 0.36
VAS (Cubic Feet): 0.18
SD (sq. inches): 8.85 required
Driver Displacement: cubic feet

Enclosure Specifications:

1/4 WaveTuning Point: 34.636673791 hertz

Line Volume: 7.138537964 cubic feet
Recommended Line Volume: -0.228798005 cubic feet

Cross Sectional Area of Line: 127.88 sq. inches
Minimum X-Sectional Area: 8.85 sq. inches
Line Depth (inches): 7.75 required

Maximum Dimensions:

External Height (inches): 18 required
External Width (inches): 33.5 required
External Depth (inches): 26.25

Material Thickness (inches): 0.75 required
Bracing Ect. Displacement: 0 cubic feet

Panel Dimensions:

Top (Green): 33.5 X 26.25
Bottom (Green): 33.5 X 26.25
Front Baffle (Orange): 25 X 16.5
Rear Baffle (Yellow): 33.5 X 16.5
Side Panel (Blue): 24.75 X 16.5
Side Panel (Red): 25.5 X 16.5
Inner Panel 1 (Teal): 17 X 16.5
Inner Panel 2 (Purple): 15.75 X 16.5
Inner Panel 3 (Pink): 15.75 X 16.5

Corner Reflector Plates

# Needed: 5
Height: 16.5 inches
Width 1: 6.42 inches
Width 2: 4.92 inches
Angle: 45 degrees
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Re: Uzu-10II Speaker

Postby IceFyre13th » Fri Sep 13, 2013 12:45 pm

Pretty impressive for a small speaker, but that design would only be the starting point.

Room dimensions are needed to get the final tuning length (need to know the resonance frequency of the room), then how much acoustic stuffing is needed to get the final tune (somewhere between .5 to .7 pounds per cubic foot).

I bet that it would sound decent from the get-go, doing the black magic would make it sound exquisite............
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