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Multi-Way Conventional loudspeakers with crossovers

System Pictures & Description
System Pictures & Description
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Old 8th December 2003, 03:18 PM   #91
claudio is offline claudio  Italy
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Default DBR software

exists a program to simulate DBR. It is in italian, was written in 1992, and is in DOS. The program name is DCAAV (Double Chamber Asymetric At Sight) and can be downloaded here: DCAAV


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Old 8th December 2003, 03:27 PM   #92
claudio is offline claudio  Italy
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you can find some informations here too (in english this time ) in a different kind of box (2 ports in front of the box), but the calculation seems to be more appromixate : http://www.diysubwoofers.org/prt/dual_chamber.htm
Vince, this is the Double Chamber Reflex presented in 1961 by G.L.Auspurger. It is a completely different system from the Elipson-Fostex DBR-DCAAV!


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Old 8th December 2003, 03:32 PM   #93
Nielsio is offline Nielsio  Netherlands
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What's the XO between the ~Eminence and the tweeter?

Does the ~Eminence have a tweeter-cone? / Do you know anything about the frequency-respons of this driver?

Is the tweeter open-baffle or closed?

I'm asking these questions because I find it an interesting config, but it might also be wise to put some sound-damping on the wall behind the speakers, in the case that mid/high-frequencies are also backfired.

I also see an Audionet SAM amplifier, which confuses me in the sense that it's way overpowered for your system. More suitable options that come to mind: low powered triode, non-inverted chipamp or buffered inverted chipamp (DIY or commercial).
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Old 8th December 2003, 03:50 PM   #94
Vince35 is offline Vince35  France
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Thanks everybody to the differents experiences on the double tuned bass reflex.

I will soon build new boxes for my loudpseakers, so I will compare the "résonateur" of Dominique Pétoin and that with the holes replacing the internal port : a friend of mine tell me that was quite easy to do and very effective.

I will surely post a topic to describe which is the better compared to a simple bass reflex box.

Sorry if my english is bad...
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Old 8th December 2003, 11:42 PM   #95
michael is offline michael  Australia
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thanks Vince for the info on the DBR, look forward to seeing that thread
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Old 9th December 2003, 12:49 AM   #96
Bose(o) is offline Bose(o)  Canada
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I believe that Bose used some type of DBR principle in the old Bose 701s. Apparently it's like double, triple, quadruple Reflex porting or something. Or wait, is it an Isobaric-BP design?
Click the image to open in full size.
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Old 9th December 2003, 01:26 AM   #97
planet10 is online now planet10  Canada
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System Pictures & Description
Originally posted by Bose(o)
Or wait, is it an Isobaric-BP design?
Yep that's it.

There was some discussion on the FR Forum about Double Bass Reflex... i may also have some stuff on my HD (if KW doesn't beat me to it).

community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
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Old 9th December 2003, 06:19 AM   #98
moe29 is offline moe29  United States
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...thought i'd post a picture of my Straight 8's a Bottlehead kit.
they aren't as DIY as what most of you are doing, but for me they
were a project! I run these with a ~5 watt X-SOZ amp and a
BZLS pre. The 8's are very nice sounding speakers and have
satisfying bass without a sub. Great speakers for low watt amp
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Old 9th December 2003, 08:15 AM   #99
r0cket- is offline r0cket-  United States
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Default Poor quality pictures, but you get the idea...


My apartment is incredibly cramped, thus the poor component positioning.

That's an NHT Model One on the far left. Sitting next to that is my broken Adcom GCD-600 and Harmon-Kardon ST-5 turntable, which I've just about got back into working order (like everything else, it was a thrift store find). Next to that is my computer rack--dual Athlon XP 1800s in the big box, PII-233 in the little box, and Sparc IIi 360 in the rack chassis under the monitor, if anyone cares. Component rack next to that, with my Classe CA-101 power amp and Kyocera DA-410cx CDP. Sitting atop the CDP is the world's crappiest passive preamp (a dual 10k, center-indexed pot salvaged from the tone control section of a 30 year old Proton receiver, soldered directly to some hacked-up interconnects, and all nailed to chunk of wood I pulled off a bird cage). Under the amp is my Paradigm sub.


And that's the other half. The speaker stand is obviously DIY. I ran out of paint in the middle of finishing the thing this weekend
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Old 9th December 2003, 01:01 PM   #100
BAM is offline BAM
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That Bose is just your textbook 8th-order bandpass with extra port area to prevent chuffing. I hear it's like a 6th-order bandpass with an outer chamber tuned to Fs that actually passes the signal to the air.
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