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Multi-Way Conventional loudspeakers with crossovers

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Old 16th June 2006, 02:15 PM   #1
jwcullen is offline jwcullen  Australia
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Join Date: Jun 2006
Default Need help Building Loudspeaker

Hi guys,

I have decided I want to build a set of 3-way loudspeakers to replace my current ones..
however I am having trouble working out the correct dimensions of the cabinet using the calculators and was hoping you guys could help me.

The tweeter specs are:

Vifa D19
Nominal impendance [Ohm] 8
Voice coil Resistance [ohm] 8
Nominal power [W] 100
Short Term Power [W] >450
Long Term power [W] 350
Operating Power [W] 5.0
Sensitivity [dB] 89.5
Frequency Range [kHz] 3-20
Free Air Resonance [Hz] 1700
Voice Coil Diameter [mm] 19
Air Gap Height [mm] 2
Eff. Diaphram Area [cmI] 4.2
Moving Mass [g] 0.18
Magnet Weight [g]/[oz] 105/3.7
Force Factor [Bl] 2.8
Qms 1.47
Qes 1.43
Qts 0.73

PAE 18WG08 6.5" Mid-Woofer x2
Revc 5.600 Ohm
Fo 43.692 Hz
Vas 36.681L
Qms 2.428
Qes 0.640
Qts 0.506
SPL 88.668dB
Power 40W/160W

3 Way Crossover - 12db 100W
* Crossover frequencies 700Hz, 3.5kHz
* 12db per octave roll off
* 100WRMS
* 8 Ohm

And finally I would like to build a cabinet similar to this:
Click the image to open in full size.

Thanks in advance!
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Old 16th June 2006, 04:28 PM   #2
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK

~ 55L tuned to ~ 30Hz or sealed 25L to 50L.

You need a properly designed 2.5 way crossover for those drivers.

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Old 16th June 2006, 05:39 PM   #3
lufbramatt is offline lufbramatt  United Kingdom
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Join Date: Jan 2005
Location: loughborough/ rochester

If this is your fist project i would build a project that has already been developed and documented on the internet or buy a kit from a shop- its very easy to throw components in a box but very hard to make them sound better than a commercial speaker first time out. Using a stock crossover is a big no-no if you want decent sound.

I would look at sites such as http://www.zaphaudio.com/, here http://www.humblehomemadehifi.com/ or here http://www.troelsgravesen.dk/Diy_Lou...r_Projects.htm for projects similar to what you have in your mind. Aestetic details of enclosure can be changed as long as you keep the basic dimensions and baffle size the same, so you can personalise designs to your taste

How about something like this: http://www.zaphaudio.com/audio-speaker16.html with a stand to make it look more like the photo you gave a link to?

Three way speakers in particular to get right and need a good understanding of the theory behind crossovers work to get them to sound like the drive units are integrated. BTW the system you desribe is not a 3 way, but either a 2-way with 2 mid-bass drivers, or a 2.5 way where the second bass driver is rolled off early to account for the -6Db step where the wavelength of the sound wave becomes longer than the width of the speaker, causing a drop in bass output- due to the sound radiating all the way around the speaker rather than mainly forwards.

Good luck with your project
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Old 17th June 2006, 07:00 AM   #4
jwcullen is offline jwcullen  Australia
diyAudio Member
Join Date: Jun 2006
Thanks guys I appreciate the input.

With that said I need to start fresh with the crossover plans for the speakers as I already have them.

Could someone please let me know the components needed for a 2.5 way crossover.. or link me to a website that could help me out?

Thanks again!
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Old 17th June 2006, 08:29 AM   #5
Andy G is offline Andy G  Australia
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Join Date: Apr 2002
Location: Newcastle, Australia
The D19 is not really suitable for use with the PAE18..it should only be used crossed high to a 4" driver, if used at all !!!
Get something with a lower Fs, eg a D27 or D25..
Even the TC20 would be a better option !!
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