WinISD response curves

maylar · 30th January 2004, 11:53 PM

It seems that just about every 10" subwoofer I try in a sealed box, WinISD says the -3dB point is about 50 Hz. Like a JL 10W0-8 it says 46 Hz. Whatzzup wid dat?

Immo_G · 31st January 2004, 01:13 AM

A 10 inch sub in a sealed box would be about that, I guess try a larger box if you want to lower it.

If you really want full bass extension, go a medium sized ported box, or a 12 inch sub, or both.

Circlotron · 31st January 2004, 10:10 AM

If the Qts is too low it will not work well in a sealed box but roll off too early. In WinISD open the parameters box and double click on the Qts figure and change it and see the effect it has. This will give you an idea of what to look for. Recently I came to the conclusion that 0.5 is best for a bass reflex box, and 0.7 is best for a 2 chamber 2 port bandpass. IMHO of course.

You can raise the Qts by putting a small amount of resistance in series.

maylar · 31st January 2004, 03:17 PM

But these subs are specifically intended for sealed box applications, and WinISD comes up with the same size box as is recommended by the speaker manufacturer. I've used the JL in my car and it went pretty darn low. Certainly below 50 Hz.

Qts is about .40

What's the point of a big subwoofer if it's not gonna go any lower than a 6.5?

dooper · 31st January 2004, 10:59 PM

Quote:

Originally posted by maylar
But these subs are specifically intended for sealed box applications, and WinISD comes up with the same size box as is recommended by the speaker manufacturer. I've used the JL in my car and it went pretty darn low. Certainly below 50 Hz.

Qts is about .40

What's the point of a big subwoofer if it's not gonna go any lower than a 6.5?

I'd suggest that a car is a pretty small room, and provides a fair bit of bass lift. That driver in that box might not go any lower that some 6.5's, but with the increased cone area, Xmax and power handling, it should be able to move a heckuva lot more air.

JMO,

dooper

owdi · 1st February 2004, 07:46 AM

A car provides a TON of gain below about 50hz, so that a sub with an F3 of 50hz is usually ideal for getting flat response without eq'ing. The bigger the car, the lower the frequency at which you get the gain.

Dan

30th January 2004, 11:53 PM	#1
maylar diyAudio Member Join Date: Jun 2003 Location: Connecticut	WinISD response curves It seems that just about every 10" subwoofer I try in a sealed box, WinISD says the -3dB point is about 50 Hz. Like a JL 10W0-8 it says 46 Hz. Whatzzup wid dat? __________________ dave

31st January 2004, 10:10 AM	#3
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	If the Qts is too low it will not work well in a sealed box but roll off too early. In WinISD open the parameters box and double click on the Qts figure and change it and see the effect it has. This will give you an idea of what to look for. Recently I came to the conclusion that 0.5 is best for a bass reflex box, and 0.7 is best for a 2 chamber 2 port bandpass. IMHO of course. You can raise the Qts by putting a small amount of resistance in series. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

31st January 2004, 03:17 PM	#4
maylar diyAudio Member Join Date: Jun 2003 Location: Connecticut	But these subs are specifically intended for sealed box applications, and WinISD comes up with the same size box as is recommended by the speaker manufacturer. I've used the JL in my car and it went pretty darn low. Certainly below 50 Hz. Qts is about .40 What's the point of a big subwoofer if it's not gonna go any lower than a 6.5? __________________ dave

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31st January 2004, 01:13 AM	#2
Immo_G diyAudio Member Join Date: Sep 2003 Location: Vic, Au	A 10 inch sub in a sealed box would be about that, I guess try a larger box if you want to lower it. If you really want full bass extension, go a medium sized ported box, or a 12 inch sub, or both.

1st February 2004, 07:46 AM	#6
owdi diyAudio Member Join Date: Sep 2003 Location: Bellevue, WA	A car provides a TON of gain below about 50hz, so that a sub with an F3 of 50hz is usually ideal for getting flat response without eq'ing. The bigger the car, the lower the frequency at which you get the gain. Dan

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