Impedance for beginners

jzagaja · 11th December 2008, 06:17 PM

Here's impedance plot for Monacor SP15A-350-Neo, 15" woofer firing upwards (like Linkwitz Pluto). Three curves: free air, stuffing only on the bottom (pipe exit) labelled "less", labelled "more" that means in a whole volume, stuffing material wool. Could you tell if green curve is ok in terms of standing waves, overall performance or this closed box require sometimes between blue and green? Is tone burst or CSD required?

jzagaja · 11th December 2008, 09:26 PM

Resulting CSD.

sreten · 12th December 2008, 11:13 AM

Hi,

The driver parameters Fs= 49Hz, Qts=0.25, Vas=125L
do not suit closed box loading unless no bass is required.

The driver should be vented an even then bass is restricted.
This is par for the course for a 105dB/W/1m professional driver.

Green appears to be overstuffed as far I can tell.

/sreten.

jzagaja · 12th December 2008, 01:35 PM

I can sacrifice efficiency for equalisation eg. "Linkwitz Transform" up to 50Hz?

jzagaja · 14th December 2008, 09:12 PM

Below impedance must be definitely flattened?

tinitus · 14th December 2008, 09:22 PM

Do you have this woofer or... ?

Its not exectly cheap, so it wouldnt be too hard to find a better one with lower Fs and higher Qts

I know Pro woofers are intended to be used in BR, but I wouldnt use any other than closed and with the proper specs I think it will do better that way...at home

Oh yes, I forgot to say that my focus is on 18"

jzagaja · 15th December 2008, 04:39 PM

I bought this woofer just after price drop and because of high efficiency, modern neodymium magnet and availability. Now look for some crossover advices. Have tried low order asymmetric passive crossovers with Zobels but couldn't find solution in LspCAD. Most of the responses have -5dB between 800-1300hz. Sound lacks nuances audible on headphones and Jordan 50mm module which is a bit too bright.

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12th December 2008, 01:35 PM	#4
jzagaja diyAudio Member Join Date: Jun 2004 Location: Szczecin	I can sacrifice efficiency for equalisation eg. "Linkwitz Transform" up to 50Hz?

14th December 2008, 09:22 PM	#6
tinitus diyAudio Moderator Join Date: Nov 2005	Do you have this woofer or... ? Its not exectly cheap, so it wouldnt be too hard to find a better one with lower Fs and higher Qts I know Pro woofers are intended to be used in BR, but I wouldnt use any other than closed and with the proper specs I think it will do better that way...at home Oh yes, I forgot to say that my focus is on 18"

15th December 2008, 04:39 PM	#7
jzagaja diyAudio Member Join Date: Jun 2004 Location: Szczecin	I bought this woofer just after price drop and because of high efficiency, modern neodymium magnet and availability. Now look for some crossover advices. Have tried low order asymmetric passive crossovers with Zobels but couldn't find solution in LspCAD. Most of the responses have -5dB between 800-1300hz. Sound lacks nuances audible on headphones and Jordan 50mm module which is a bit too bright.

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