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Old 1st March 2005, 11:49 AM   #1
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Default Stages in loudspeaker building

After doing quite a bit of research I have become familiar with many of the terms and ideas behind loudspeaker design. I would like to now start building my own speaker. However, I don't wish to reinvent the wheel. What are the steps that are necessary to go through while building a loudspeaker? If you can give me a list I would be very appreciative.

Just keep in mind that the drivers that I will be using are Morel, solely because their factory is about 5 Minutes drive for my house. It would be very convenient for me to use them. About the design, I'm not sure I want a two-way speaker or three-way speaker. I am open for suggestions. I'm kind of leaning towards two-way because this is my first project.

Anyway, thanks for the advice.
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Old 1st March 2005, 01:39 PM   #2
SY is offline SY  United States
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Stage one: Decide on your target. What are you looking for as far as off axis response, on axis response, low frequency limit...?

Stage two: Choose drivers that will meet the criteria decided on in Stage one.

Stage three: measure the driver impedances and frequency responses on a baffle roughly the size and shape you're considering.

Stage four: using some sort of speaker CAD program (I use Calsod, but there are a lot of other good ones), simulate the drivers' impedances and on-axis responses.

Stage five: With all this in hand, decide on appropriate crossover slopes and frequencies.

Stage six: Using the CAD program, design appropriate crossovers.

Stage seven: Build the prototypes, then measure them to see if they hit the target. If not, tweak and adjust values until they do.

Stage eight: Listen and listen some more. Then go back and start tweaking until you're happy with the sound.

One more important thought:

Stage zero: Have a copy of Dickason's Loudspeaker Design Cookbook and d'Appolito's Testing Loudspeakers on hand. Read them and understand them.
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Old 1st March 2005, 07:07 PM   #3
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Step One: Find a tried and true design that will meet your needs using Morel drivers.

Step Two: Get drivers and crossover parts.

Step Three: Assemble box, install drivers.

Step Four: Enjoy
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Old 1st March 2005, 07:20 PM   #4
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SY has given a great list if you are planning to design your own speakers. Have you read LDC or D'Apolitto's Testing Loudspeakers? They are required, IMO, if you're planning to design your own speakers. Then there is the significant investment in software and testing equipment.

As a first project, I would suggest building a kit by a recognized designer. You'll get your feet wet with the woodwork and crossover assembly and likely have something that will sound pretty good at a signficant cost savings. You can then evaluate the experience and see if you want to take it a step further by designing your own.

Here's a morel kit, if you're interested:

http://www.iplacoustics.co.uk/ipl_m4...d_compact_.htm
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Old 1st March 2005, 07:37 PM   #5
SY is offline SY  United States
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I cannot disagree with Bill or conscious. If you don't want this to be an enveloping project but just want a decent set of speakers, look around for a kit or similar already-worked-out design. If you go the design-it-yourself route, plan on a year of weekends, a few hundred dollars in testing tools, and an amazing learning experience.
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Old 1st March 2005, 07:49 PM   #6
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I am surprised by the responses...

Nobody mentioned the "forgiveness phase" where the new speakers are placed near the last two sets of "new speakers".

This is an important point with serious conjugal consequences that should not be underestimated.

Keep your head low to avoid rolling pins.
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Old 1st March 2005, 08:26 PM   #7
rjb is offline rjb  New Zealand
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A more realistic method of approach for those of us that are married.

1) Bring roses home.

2)Take wife out to restaurant. Fill with wine. get permission to spend money. Negotiate largest maximum value allowable.

3) Involve wife with physical design. Get an ideal of shapes, finishes etc that she thinks will match room and furniture. Also location, as this determines if open-back allowable.

4) Build rough cardboard model. Paint for appearance. Repeat until wife satisfied.

5) Measure internal volume and shape. Determine what this allows, eg full range, 2- or three way etc. This also determines maximum size of woofer (and midway if allowed box big enough)

6)Search manufacturer's lists for possible drivers that fit size and cost criteria. Woofer most critical, so choose a selection of these first.

7) Model each of these for available size enclosure. Use MJK's worksheet. This determines enclosure type (TL, reflex, sealed), for each option.

8) Read all relevant DIY threads re enclosure types. Get thoroughly confused. Choose a pin and select woofer.

9) Read DIY threads to select matching tweeter. Get further confused. Choose a pin ........

10) Read DIY threads re crossover. Get even more confused. Choose active as easiest to implement, then discard on grounds of cost.

11) Take wife to nearest HiFi shop.
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Old 1st March 2005, 08:31 PM   #8
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1) Get rid of wife.

2) Do as you please.
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Old 2nd March 2005, 12:06 AM   #9
RHosch is offline RHosch  United States
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(1) Marry a great woman.

(2) Do as you please.

(3) Realize that what pleases you also pleases her, and vice versa.
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Old 2nd March 2005, 12:38 AM   #10
sardonx is offline sardonx  Canada
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Don't forget to concentrate on the cosmetics of the speaker
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