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Old 13th January 2010, 10:15 AM   #1
diyAudio Member
 
Join Date: Jan 2010
Default University Design, Help! :)

Hello! Im new to the forum, and in need of some help, I am studying for a Bsc in design.

One of the thing I have to design is a speaker enclosure for an ipod dock. We have been given the speakers and power source.

Only 2 speakers are allowed. Here is the stats:
Loudspeaker Type: Woofer (340M)
Nominal Impedance: 8 Ohm
Resonant Frequency: 120Hz
Usable Frequency Response: 120Hz 16kHz
Nominal Power Handling: 10W
Music Power Handling: 20W
Sensitivity (SPL): 88dB/W/0.5m
Chassis Shape: Round
Chassis Diameter: 78mm
Magnet Housing Diameter: 70mm
Driver Depth: 40mm
Cone Diameter: 62mm
Fixing Centers: 4 x 3.5mm holes at 90 intervals on a 84mm Circle
Baffle Cut Out: 78mm

I am trying to get the best sound out of them as possible, as sound quality is going to be a part of the criteria. Can anyone here point me in the right direction of size of enclosure and if it should be ported or not!

Thanks, Richard
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Old 13th January 2010, 01:54 PM   #2
mjf is offline mjf  Austria
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Join Date: Jan 2009
Location: Austria
hello.
do you have a datasheet of this driver?
you need thiele small parameters (free air resonant frequency,Vas,Qms,Qes.....).
with the datas you can determine an enclosure.
if you have built the box you can tune it with a small crossover (probably a rlc network for the midband..........).
greetings
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Old 13th January 2010, 02:36 PM   #3
diyAudio Member
 
Join Date: Sep 2008
Location: Bristol
If you want to extract the best sound from the ipod, it is worth using the line out port of a proper dock, or using a cable like this, that is if you can adjust the volume of the power source?

LOGIC3 MIP142 iPod to 3.5mm Stereo Cable: Amazon.co.uk: Electronics & Photo


I was looking at making a portable boom box, and thought about making it resemble the B&W zepplin, however using a plain skateboard deck, as most a maple plywood, have a slightly curved baffle, and very strong. If your good with a jigsaw or have access to a CNC, you could easily cut U shapped ribs/braces to create a former for the rear and include port holes if needed and even handles. Could even horn load it.

iPod Speakers – Apple iPod Docking Station Bowers & Wilkins | B&W Speakers

My thinking was to create something quite striking, similar to Thomas Heatherwicks buildings

Click the image to open in full size.

Click the image to open in full size.

Good Luck. Post pictures.
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Old 13th January 2010, 11:00 PM   #4
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Location: Silicon Valley
Presumably it will not be judged on its low bass performance? I say make things easy on yourself and keep the box sealed (and don't stress about the exact volume). Unless you really know what you're doing and know the specs for the driver, then maybe open baffle. But it's an 'industrial design,' ie styling project, right? Can you elaborate?

The fundamentals of 'best sound' dictate to make the speaker LOCATION as 'perfect' as possible, so symmetrically located on the listening axis (where the ears are) and with as much free space around the cabinet as possible. But as far as the shape of the cabinet is concerned, there's nothing new under the sun (or is there)?

(I like the laminations idea as well, Studio Au.)
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Old 15th January 2010, 10:53 PM   #5
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Join Date: Jan 2010
Thankyou for all the replys. Its for a Product design. About 15% relate to sound quality. All the info I can get it in my original post. I was just wondering, would certain shaped enclosures help with this? I.e curved at the back? or any other ideas?

Thanks
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