Help required for a Teacher in Wales

Hi I have just signed up and trawled some of the cabinet designs.

I am a teahcer in a school in South Wales with an AS class of budding docking station designers. I want to demonstrate how to create an attractive 3 way speaker system for the home, like a www.google.co.uk/images?hl=en&q= ... 80&bih=632

Are there any plans of this nature that I can inspire these lads to look beyond assemblying kits and more towards designing the speaker systems.

Thanks for any help

Dorian

Heres one site that might be the sort of thing your looking for
www.humblehomemadehifi.com/
Also why not look at some sim software such as winisd
www.linearteam.dk/
and Hornresp
www.hornresp.net.ms/
These programs are free to use and give a good insight into speaker design.
smiley1

Thanks Martin

That is just what I was looking for. You have saved me a great deal of time and hassle. I want to inspire these 16-17year olds to consider music reproduction as a potential career. It is an area of design I have little experience of but a great deal of personal interest in. There is a simple amplifier kit that I use with students in year 9, 1.2W but connected to a decent speaker it knocks out reasonable sound. It gives the wow factor when they see a huge speaker powered of a 9V (smoke alarm) battery.

Do you mind if I pick your brains a little further with regard to the software when the time comes?

I intend to dismantle a Mission 2 way speaker and integrate this into my 3 way docking station. Input via a 3.5mm stereo jack amplifier a TDA2005 module www.quasarelectronics.com/3143-1 ... da2005.htm .

I have downloaded a copy of the Loudspeaker Design Cookbook - what I need now is experience in how to decide the volume required for specific speaker drivers(if I am using the correct terminology)

Regards
Dorian

Chip amps can be used to get surprisingly good results. For more information on chip amps try doing a web search on 'gainclone'
Unfortunately dismanting a pair of speakers for the drivers will mean that you will not have the manufactuers data to enter into the enclosure simulating software. The Thiele-Small paramerers for a particular driver can be measured but it is a fairly technical process.
More info on measuring speaker drivers here.
sound.westhost.com/tsp.htm
smiley1

I hadn't heard of gainclone before. I use this site for schools www.kitronik.co.uk/stereoampkit.htm and I want to introduce sytems design into their folios as well as aesthetic design.

Is the volume of the enclosure critical in relation to the driver used? If so how can I calculate this?

Some of the pupils are using this driver www.rapidonline.com/netalogue/specs/35-2908e.pdf

Does this datasheet provide enough information for good quality testing at the end?

Is the volume of the enclosure critical in relation to the driver used? If so how can I calculate this?

For simple sealed and reflex cabinets I use Winisd (see previous post)
I found TS parameters for the FR10 driver quoted here...
www.diyaudio.com/forums/full-ran ... -fr10.html

Visaton FR10 data...
Technical Data:
Rated power 20 Watt
Maximum power 30 Watt
Nominal impedance Z 8 Ohm
Frequency response 80 - 20000 Hz
Mean sound pressure level 86 dB (1W/1m)
Maximum cone displacement 8 mm
Resonance frequency fs 97 Hz
Magnetic induction 0,95 Tesla
Magnetic flux 180 µ Weber
Height of front pole-plate 3 mm
Voice coil diameter 2 cm
Height of winding 0,6 cm
Cutout diameter 10 cm
Net weight 0,38 kg
D.C. resistance Rdc 7,2 Ohm
Mechanical Q factor Qms 2,23
Electrical Q factor Qes 1,17
Total Q factor Qts 0,77
Equivalent volume Vas 1,7 l
Effective piston area Sd 50 cm2
Dynamically moved mass Mms 5,7 g
Force factor Bxl 4,61 T · m
Inductance of the voice coil L 0,55 mH

Does that help? smiley1