Double bass reflex information - Page 3

Stephen D · 8th February 2004, 11:07 AM

-macky888-

The DCR is not at all like a 6th order BP. It's full range since the speaker fires into free space & not totally enclosed in a box as a BP is. My DCR doesn't sound muddy. If anything... I seem to notice a slight choked or hollow mid bass, which could be the dip or could just be room nodes. Some day I really should take it outside & give it a real valid listening test & FR measurement. I would suspect there is some trade off in transient responce (group delay) for the wider range of port aided excursion limiting. Let's face it, ports are resonators. However mine doesn't sound boomy in the least. The deep 30 Hz range is very good strong & not boomy.

claudio · 8th February 2004, 10:52 PM

Hi Adrian,
the typical notch of Weems DCR happens at F3 as you can see in the site. About changing the volumes ratio, I also show in the site what happens increasing and decresing V2.
The tuning box frequency of a reflex system, Fb, corresponds to the Weems DCR F2, as I show in the impedance comparison graph.

Regards

Claudio

wingman · 23rd February 2004, 12:28 AM

Hi all

Back in jan. 2004 i sold my Dynamic 1200 MDS Car sub. (12" car sub.)

MDS hompage

When i where driven whit it, it was in a Dual-Chamber ported system. like this
http://www.diysubwoofers.org/prt/dual_chamber.htm

tunede to 27hz.

I whas smooth, deep, tight an all in all very very good sounding !

All who heared it likede it alot ! ( i know alot hifi freaks

)

Just for fun i had it messured from 30-65 Hz 140 Db +-0,35db whit 600 Wrms.
in my car. NICE i think.

wingman · 24th February 2004, 12:35 AM

I like to know more about DCR !

kelticwizard · 24th February 2004, 03:19 AM

Wingman:

Here's a thread about the kind of Double Chamber Reflex you showed in your post:
article about double chamber speaker enclosure

REDSKIN · 28th February 2004, 10:16 PM

Not super informative but worth a look?

REDSKIN · 28th February 2004, 10:19 PM

Not super informative but worth a look?

http://www.decware.com/cgi-bin/yabb/...num=1078003887

8th February 2004, 11:07 AM	#21
Stephen D diyAudio Member Join Date: Dec 2003 Location: In a house	-macky888- The DCR is not at all like a 6th order BP. It's full range since the speaker fires into free space & not totally enclosed in a box as a BP is. My DCR doesn't sound muddy. If anything... I seem to notice a slight choked or hollow mid bass, which could be the dip or could just be room nodes. Some day I really should take it outside & give it a real valid listening test & FR measurement. I would suspect there is some trade off in transient responce (group delay) for the wider range of port aided excursion limiting. Let's face it, ports are resonators. However mine doesn't sound boomy in the least. The deep 30 Hz range is very good strong & not boomy. __________________ You thought I had it!?... I thought you had it!

23rd February 2004, 12:28 AM	#23
wingman diyAudio Member Join Date: Jan 2004 Location: jylland	DCR In CAR ! Hi all Back in jan. 2004 i sold my Dynamic 1200 MDS Car sub. (12" car sub.) MDS hompage When i where driven whit it, it was in a Dual-Chamber ported system. like this http://www.diysubwoofers.org/prt/dual_chamber.htm tunede to 27hz. I whas smooth, deep, tight an all in all very very good sounding ! All who heared it likede it alot ! ( i know alot hifi freaks ) Just for fun i had it messured from 30-65 Hz 140 Db +-0,35db whit 600 Wrms. in my car. NICE i think. __________________ bass is music

24th February 2004, 12:35 AM	#24
wingman diyAudio Member Join Date: Jan 2004 Location: jylland	I like to know more about DCR ! __________________ bass is music

24th February 2004, 03:19 AM	#25
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	Wingman: Here's a thread about the kind of Double Chamber Reflex you showed in your post: article about double chamber speaker enclosure __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

28th February 2004, 10:16 PM	#26
REDSKIN diyAudio Member Join Date: Jan 2004 Location: LONDON	dcr/abc Not super informative but worth a look? __________________ He shoots. He scores!


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8th February 2004, 10:52 PM	#22
claudio diyAudio Member Join Date: Feb 2002 Location: Italy	Hi Adrian, the typical notch of Weems DCR happens at F3 as you can see in the site. About changing the volumes ratio, I also show in the site what happens increasing and decresing V2. The tuning box frequency of a reflex system, Fb, corresponds to the Weems DCR F2, as I show in the impedance comparison graph. Regards Claudio

28th February 2004, 10:19 PM	#27
REDSKIN diyAudio Member Join Date: Jan 2004 Location: LONDON	dcr/abc Not super informative but worth a look? http://www.decware.com/cgi-bin/yabb/...num=1078003887 __________________ He shoots. He scores!

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