Huge sealed vs open baffle

Flemming J P · 26th April 2004, 09:38 PM

I going to redo a very badly constructed wall, and thougt of making a rather big seal cabinet (approx 3500l).

Currently I running a open baffle setup (JBL2225 + fostex FE206E with active XO and some eq) and I like the free airy charasticits very much.

Will the huge sealed cabinet also have this sound

I've been able to find sites descriping subwoofers being build this way, but my concer is the midrange which no of the sites address, or do I just need a two day google course?

ingvar ahlberg · 26th April 2004, 10:01 PM

The JBL´s could work well that way if wall is rigid enough, the Fostex units will be utterly spoilt. All the caracter You´ve got is an effect of not having a cabinet.

454Casull · 27th April 2004, 12:27 AM

With a sealed cabinet that large, the enclosure basically becomes free baffle. The bass rolloff isn't as great because the front/back waves never meet each other, but Linkwitz says monopolar bass has more peaks and nulls in the response than does dipolar bass.

johninCR · 27th April 2004, 01:01 AM

What you'd be looking at is an infinite baffle. Check out the "Cult of the Infinitely Baffled". Those guys would be the IB experts.

454Casull · 27th April 2004, 01:19 AM

Ack! What made me say "free baffle"? I was thinking IB.

Flemming J P · 27th April 2004, 06:05 AM

I did check ut "Cult of the Infinitely Baffled" but couldn't find any info or projects where the entire speaker was made this way only the sub.

I will try asking them if anyone knows how the sound of IB compares to OB.

planet10 · 27th April 2004, 06:31 AM

123 ft^3. Might work ... can you make the wall leaky?

dave

Flemming J P · 27th April 2004, 06:48 AM

How leaky does it need to be?

And is it better to leak into the room where the sound should end up or the room on the other side of the wall?

planet10 · 27th April 2004, 06:51 AM

Quote:

Originally posted by Flemming J P
How leaky does it need to be?

And is it better to leak into the room where the sound should end up or the room on the other side of the wall?

Enuff to make sure there is No change in pressure in the cavity... the bass would go lower if it was the other room... (a big double chamber box

)

dave

Coolin · 27th April 2004, 07:15 AM

But not being able to adjust things like placement and toe-in etc. seems a little sad. You would'nt even be able to move the sweet spot a little. Bass shouldnt bive much trouble though.

Coolin

26th April 2004, 09:38 PM	#1
Flemming J P diyAudio Member Join Date: Oct 2001 Location: Sweden	Huge sealed vs open baffle I going to redo a very badly constructed wall, and thougt of making a rather big seal cabinet (approx 3500l). Currently I running a open baffle setup (JBL2225 + fostex FE206E with active XO and some eq) and I like the free airy charasticits very much. Will the huge sealed cabinet also have this sound I've been able to find sites descriping subwoofers being build this way, but my concer is the midrange which no of the sites address, or do I just need a two day google course?

26th April 2004, 10:01 PM	#2
ingvar ahlberg diyAudio Member Join Date: Feb 2004 Location: Kungsbacka on the Swedish westcoast	The JBL´s could work well that way if wall is rigid enough, the Fostex units will be utterly spoilt. All the caracter You´ve got is an effect of not having a cabinet. __________________ Ingvar

27th April 2004, 01:01 AM	#4
johninCR diyAudio Member Join Date: Apr 2004 Location: Costa Rica	What you'd be looking at is an infinite baffle. Check out the "Cult of the Infinitely Baffled". Those guys would be the IB experts. __________________ Everyone has a photographic memory. It's just that most are out of film.

27th April 2004, 06:31 AM	#7
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	123 ft^3. Might work ... can you make the wall leaky? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

27th April 2004, 07:15 AM	#10
Coolin diyAudio Member Join Date: Apr 2003 Location: Holland	Good idea But not being able to adjust things like placement and toe-in etc. seems a little sad. You would'nt even be able to move the sweet spot a little. Bass shouldnt bive much trouble though. Coolin


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27th April 2004, 12:27 AM	#3
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	With a sealed cabinet that large, the enclosure basically becomes free baffle. The bass rolloff isn't as great because the front/back waves never meet each other, but Linkwitz says monopolar bass has more peaks and nulls in the response than does dipolar bass.

27th April 2004, 01:19 AM	#5
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Ack! What made me say "free baffle"? I was thinking IB.

27th April 2004, 06:05 AM	#6
Flemming J P diyAudio Member Join Date: Oct 2001 Location: Sweden	I did check ut "Cult of the Infinitely Baffled" but couldn't find any info or projects where the entire speaker was made this way only the sub. I will try asking them if anyone knows how the sound of IB compares to OB.

27th April 2004, 06:48 AM	#8
Flemming J P diyAudio Member Join Date: Oct 2001 Location: Sweden	How leaky does it need to be? And is it better to leak into the room where the sound should end up or the room on the other side of the wall?

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