4x 18" woofers and other stuff, free for local pickup.

ErikdeBest · 22nd January 2012, 04:51 PM

My first attempts in building a baffleless speaker: 2 AL1800 (18") woofers per side up to 300Hz, and a 8" FR speaker from 300Hz onwards. Haven't performed any measurements on it, and there was surely still room for improvement, but not bad at all for a start.

I am keeping the Fostex FR drivers, but you can have the MDF baffles to build in another set of 8" FR drivers.

ErikdeBest · 22nd January 2012, 04:54 PM

Specs of the woofers:

Nominal diameter 450 mm
Rated impedance 8 Ohms
Power capacity 200 W
Sensitivity 98 dB
Frequency range 25 - 3,000 Hz
Thiele-Small-Parameter
FS 29,9469 Hz
Re 7,2000 Ohm
Qms 8,3143
Qes 0,6767
Qts 0,6258
Vas 518,4930 l
No (Ref efficency) 1,9898 %
Sd 0,1195 sqm
Motor Impedance Parameter
Levc (Induc at 1 kHz) 1,3702 mH
Levc (Induc at 20 kHz) 0,6482 mH
Krm (Resistance Cons) 9,2922 mOhm
Kxm (Reactance Cons) 12,1807 mH
Rem (Res at 1 kHz) 4,3991 Ohm
Rem (Res at 20 kHz) 36,2865 Ohm
Erm (Resist. Expont) 0,7043
Exm (React Expont) 0,7502

If you are interested you can also have the 'enclosure' for free... I will only keep the Fostex driver.

Rullknufs · 22nd January 2012, 05:04 PM

Dang, should've had those woofers for my econowave project. Too bad I'm not your neigbour

Boden · 22nd January 2012, 05:10 PM

Erik, where do you live?

Eelco

ErikdeBest · 22nd January 2012, 05:13 PM

Hi Eelco,

Thanks for reminding me about the location! I live in Eindhoven, smartest region in the world

https://www.intelligentcommunity.org...2011&refno=634

Best regards, Erik

Boden · 22nd January 2012, 05:17 PM

Hello Erik,

If indeed for free, I am interested in your 4 woofers. I am contemplating about finding time to pick them up.

Regards,

Eelco

GaloDourado · 22nd January 2012, 06:16 PM

I can arrange a courier to pick your 4 woofers in case Boden no longer wants them!

Boden · 22nd January 2012, 06:17 PM

I am interested!

Eelco

Boden · 22nd January 2012, 06:19 PM

Erik, you have mail.
Eelco

Boden · 28th January 2012, 10:22 AM

Erik de Best,

Where art thou?

Kind Regards,

Eelco

22nd January 2012, 04:54 PM	#2
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Itoculo	Specs of the woofers: Nominal diameter 450 mm Rated impedance 8 Ohms Power capacity 200 W Sensitivity 98 dB Frequency range 25 - 3,000 Hz Thiele-Small-Parameter FS 29,9469 Hz Re 7,2000 Ohm Qms 8,3143 Qes 0,6767 Qts 0,6258 Vas 518,4930 l No (Ref efficency) 1,9898 % Sd 0,1195 sqm Motor Impedance Parameter Levc (Induc at 1 kHz) 1,3702 mH Levc (Induc at 20 kHz) 0,6482 mH Krm (Resistance Cons) 9,2922 mOhm Kxm (Reactance Cons) 12,1807 mH Rem (Res at 1 kHz) 4,3991 Ohm Rem (Res at 20 kHz) 36,2865 Ohm Erm (Resist. Expont) 0,7043 Exm (React Expont) 0,7502 If you are interested you can also have the 'enclosure' for free... I will only keep the Fostex driver. __________________ my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!

22nd January 2012, 05:13 PM	#5
ErikdeBest diyAudio Member Join Date: Mar 2003 Location: Itoculo	Hi Eelco, Thanks for reminding me about the location! I live in Eindhoven, smartest region in the world https://www.intelligentcommunity.org...2011&refno=634 Best regards, Erik __________________ my surname is indeed 'de Best': neither misspelling nor snobbism! Ask SY!

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22nd January 2012, 05:04 PM	#3
Rullknufs diyAudio Member Join Date: Mar 2010 Location: Sweden	Dang, should've had those woofers for my econowave project. Too bad I'm not your neigbour

22nd January 2012, 05:10 PM	#4
Boden diyAudio Member Join Date: Mar 2010	Erik, where do you live? Eelco

22nd January 2012, 05:17 PM	#6
Boden diyAudio Member Join Date: Mar 2010	Hello Erik, If indeed for free, I am interested in your 4 woofers. I am contemplating about finding time to pick them up. Regards, Eelco

22nd January 2012, 06:16 PM	#7
GaloDourado diyAudio Member Join Date: Sep 2010	I can arrange a courier to pick your 4 woofers in case Boden no longer wants them!

22nd January 2012, 06:17 PM	#8
Boden diyAudio Member Join Date: Mar 2010	I am interested! Eelco

22nd January 2012, 06:19 PM	#9
Boden diyAudio Member Join Date: Mar 2010	Erik, you have mail. Eelco

28th January 2012, 10:22 AM	#10
Boden diyAudio Member Join Date: Mar 2010	Erik de Best, Where art thou? Kind Regards, Eelco

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