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Old 8th February 2004, 11:07 AM   #21
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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.
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Old 8th February 2004, 10:52 PM   #22
claudio is offline claudio  Italy
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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.

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Old 23rd February 2004, 12:28 AM   #23
wingman is offline wingman  Denmark
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Thumbs up 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

Click the image to open in full size.

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.
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Old 24th February 2004, 12:35 AM   #24
wingman is offline wingman  Denmark
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I like to know more about DCR !
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Old 24th February 2004, 03:19 AM   #25
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Wingman:

Here's a thread about the kind of Double Chamber Reflex you showed in your post:
article about double chamber speaker enclosure
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Old 28th February 2004, 10:16 PM   #26
REDSKIN is offline REDSKIN  England
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Default dcr/abc

Not super informative but worth a look?
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Old 28th February 2004, 10:19 PM   #27
REDSKIN is offline REDSKIN  England
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Default dcr/abc

Not super informative but worth a look?

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