I just finished my speakers consisting of ScanSpeak 21w8552 and D2905/9300 drivers. No cosmetic treatment yet and only basic 2nd order x-overs with 1mH and 7uF components. Even like this, compared to my existing Monitor Audio Silver3's, they sound absolutly great. At last I can experience some decent bass and clarity. Sound stage are also much better defined and room is actually filled with sound, not so directional as before, anymore.
Cabinet is from 22mm MDF, glued and screwed, 30L - Fb 44Hz. I also found a easier way to fine tune port length - accidentaly. I tried the method of lightly touching cone and moving adjustable port in and out, but could not feel exact or even close Fb. Then I tried to look at cone and see any change in movement. To see I used flashligth with adjustable focal point. As I moved port, I saw tiny white line on edge of cone, getting longer and shorter. It was a piece of wood dust that with the vibration appeared as a solid line. The frequency where this "line" was at it's shortest, was between 42Hz and 45Hz. Difficult to judge a short , thin line's length, if it is not even 1mm long - exactly. The planned Fb was 44Hz, so it seems like I am very close with my calculated port dimensions of 76mm x 170mm.
Now I must find somebody who can help design a proper x-over circuit. Any suggestions/volunteers ?? 😉
Is it O.K. to fit this type of foam and so much (top, back, sides and bottom) for damping?
Some early pics:
Cabinet is from 22mm MDF, glued and screwed, 30L - Fb 44Hz. I also found a easier way to fine tune port length - accidentaly. I tried the method of lightly touching cone and moving adjustable port in and out, but could not feel exact or even close Fb. Then I tried to look at cone and see any change in movement. To see I used flashligth with adjustable focal point. As I moved port, I saw tiny white line on edge of cone, getting longer and shorter. It was a piece of wood dust that with the vibration appeared as a solid line. The frequency where this "line" was at it's shortest, was between 42Hz and 45Hz. Difficult to judge a short , thin line's length, if it is not even 1mm long - exactly. The planned Fb was 44Hz, so it seems like I am very close with my calculated port dimensions of 76mm x 170mm.
Now I must find somebody who can help design a proper x-over circuit. Any suggestions/volunteers ?? 😉
Is it O.K. to fit this type of foam and so much (top, back, sides and bottom) for damping?
Some early pics:
Attachments
Thanx for compliment. Yes, I 1st wanted to try some horn speakers, but is glad I did not. These where quit a challenge already. It is O.K. to read about all factors and enter all specs. into WinISD, but the real thing is a bit differant. I did not wanted to build a small 12L nor a bigger 120L, and did not had much of a choice on drivers, so came up with this design. WinISD did show me that it can work, and with some other help, it seems like it works quit well.
*acknowledgements*
Thanx to all. Makes the life of a novice "speakerbuilder" much easier.
Pierre Watts :
For making these drivers available to me and giving alot of advice.
(PWatts)
http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=7205
WinISD 0.44 :
Very nice speaker design software - free!!
(Juha Hartikainen)
www.linearteam.org/winisd.html
Test Tone Generator 3.62 :
Handy software signal generator - free!!
(Timo Esser)
www.esser.u-net.com/ttg.htm
ESP :
Alot of very usefull information on just about everything you need to know on building speakers.
(Rod Elliot)
http://sound.westhost.com/index.html
"The Passive Crossover Design Calculator" Ver. 2.03 :
If you know nothing about x-over designing, go here.
(Jeff Bagby)
http://www.pvconsultants.com/audio/crossover/pcdc.htm
Thanx to all. Makes the life of a novice "speakerbuilder" much easier.
Pierre Watts :
For making these drivers available to me and giving alot of advice.
(PWatts)
http://www.diyaudio.com/forums/member.php?s=&action=getinfo&userid=7205
WinISD 0.44 :
Very nice speaker design software - free!!
(Juha Hartikainen)
www.linearteam.org/winisd.html
Test Tone Generator 3.62 :
Handy software signal generator - free!!
(Timo Esser)
www.esser.u-net.com/ttg.htm
ESP :
Alot of very usefull information on just about everything you need to know on building speakers.
(Rod Elliot)
http://sound.westhost.com/index.html
"The Passive Crossover Design Calculator" Ver. 2.03 :
If you know nothing about x-over designing, go here.
(Jeff Bagby)
http://www.pvconsultants.com/audio/crossover/pcdc.htm
Very nice, but if you want to go further with speaker building.
Try making/of buying an measurment mic. there are many websites discribing this. For example:
For a mic. amplifier/impedance measurment: http://www.gti.net/wallin/audio/audio.html
Electret mic capsule: http://sound.westhost.com/project93.htm
and http://www.linkwitzlab.com/sys_test.htm#Mic (very good site)
For measuring you can use your soundcard with a program like hobbybox. For modeling the filter you can use Speaker workshop.
Both can be found with a little googleing 😀
Try making/of buying an measurment mic. there are many websites discribing this. For example:
For a mic. amplifier/impedance measurment: http://www.gti.net/wallin/audio/audio.html
Electret mic capsule: http://sound.westhost.com/project93.htm
and http://www.linkwitzlab.com/sys_test.htm#Mic (very good site)
For measuring you can use your soundcard with a program like hobbybox. For modeling the filter you can use Speaker workshop.
Both can be found with a little googleing 😀
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