What can I do with this woofer?

Bricolo · 31st March 2004, 10:05 PM

Here are the specs:

http://www.e44.com/datas/ht240a0.pdf

sreten · 31st March 2004, 10:46 PM

Hmmm....

Old driver (ten years). Low mass cone for size. High efficiency.

Valve two way with a large horn treble to get down to 1.5 khz ?

Box size is not going to be small,

sreten.

sreten · 31st March 2004, 10:53 PM

Quote:

Originally posted by sreten
Box size is not going to be small,
sreten.

Unless you go for higher Q sealed,

sreten.

Bricolo · 1st April 2004, 06:51 AM

It will be used for a sub. Your first orange box looks good.
Thanls

kelticwizard · 1st April 2004, 09:43 PM

The speaker is high efficiency in the midband only.

The rolloff of a Qts = 0.5 speaker starts about 3 times it's Fs. Here, the Fs is 42. So the speaker is about 90 or 91 dB efficient. The climbing SPL throughout the midbass and midrange is not bass rolloff that will change when put into a box.

Before you begin the project, you might want to ask yourself: do I really want to build a 7 cubic foot giant box for this speaker? I mean it will work fine and all, but still.

Throwing together a 1 or 1 1/2 cubic foot box just to make use of a speaker hanging around is one thing. I guess we have all done that. But to properly construct a 200 liter box takes some doing, takes some time and even some money. Do you really want to invest all that into a box that, at the end, will have a bass cutoff of 33 Hz? And if you are going to use it as a sub, that midband high efficiency doesn't get used anyway, in fact it will be an obstacle for your crossover.

If you are determined to make use of this woofer, by all means go ahead. If you think the end product will justify the size and effort put into making a large box, well, you might wish to reconsider.

sreten · 1st April 2004, 10:37 PM

If its not apparent I agree with KC,

its not suited to subwoofer duty, nor was it ever intended to.

With a 200L (7.3 cuft) box you can do far better, especially
in terms of maximum output levels for the same efficiency.

Its suited for a sealed high efficiency two / three way.

sreten.

31st March 2004, 10:05 PM	#1
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	What can I do with this woofer? Here are the specs: http://www.e44.com/datas/ht240a0.pdf

1st April 2004, 09:43 PM	#5
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	The speaker is high efficiency in the midband only. The rolloff of a Qts = 0.5 speaker starts about 3 times it's Fs. Here, the Fs is 42. So the speaker is about 90 or 91 dB efficient. The climbing SPL throughout the midbass and midrange is not bass rolloff that will change when put into a box. Before you begin the project, you might want to ask yourself: do I really want to build a 7 cubic foot giant box for this speaker? I mean it will work fine and all, but still. Throwing together a 1 or 1 1/2 cubic foot box just to make use of a speaker hanging around is one thing. I guess we have all done that. But to properly construct a 200 liter box takes some doing, takes some time and even some money. Do you really want to invest all that into a box that, at the end, will have a bass cutoff of 33 Hz? And if you are going to use it as a sub, that midband high efficiency doesn't get used anyway, in fact it will be an obstacle for your crossover. If you are determined to make use of this woofer, by all means go ahead. If you think the end product will justify the size and effort put into making a large box, well, you might wish to reconsider. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

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1st April 2004, 06:51 AM	#4
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	It will be used for a sub. Your first orange box looks good. Thanls

1st April 2004, 10:37 PM	#6
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	If its not apparent I agree with KC, its not suited to subwoofer duty, nor was it ever intended to. With a 200L (7.3 cuft) box you can do far better, especially in terms of maximum output levels for the same efficiency. Its suited for a sealed high efficiency two / three way. sreten.

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