Continuum and II Version by Jeff Bagby (RIP) - Documentation

Pete B

Pete B

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Here's a link to the Meniscus page on the Wayback machine:
Jeff's original design employed the Dayton RS28A tweeter that is NLA, and he said that the updated
RST28A was too different to replace it. He produced the II version with the Morel CAT308 tweeter that
is available at Madisound and the woofer is currently at PE.
web.archive.org

Continuum II Loudspeaker Kit - Meniscus Audio

The Continuum II speaker kit by Jeff Bagby A great version of the LS3/5A design.
web.archive.org web.archive.org

Edit: Another discussion of Jeff B. designs:

Jeff Bagby Designs - still available or still to build?

Hi! I never heared one of Jeff Bagbys Loudspeakers and unhappily I have to say, I think they are very unknown here in Germany. For me they could be quite fitting, because several of his designs were small ones and thats what I`m in need of. Now I`ve seen, the Meniscus Store is down. My question...
www.diyaudio.com www.diyaudio.com

Salk-Continuum.jpg

I'm attaching the files from the Meniscus page, not very detailed plans, strange, does anyone know the
depth of the cabinet?
Edit: Dimensions found: cabinet is 8"W x 12.5"H x 8.5"D

Drivers:
Continuum-II-Drivers.jpg

Crossover parts:
Continuum-II-crossover-components.jpg

A friend built a pair and measured the system Fc (78.5 Hz) and Qtc (1.28) as shown below:
CONTINUUM BOX Fs AND Qts.jpg
 

Attachments

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I believe i have the cabinet dimensions, will need to check.

Currently trying to find a vendor who can build me cabinets for this project, anyone have a recommendation? Have all the parts ready to go, just no ability to do any wood work at my current location.
 
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FOR CROSSOVER SCHEMATIC
Jeff kept the crossover schematic private, but it is easy to trace out from the picture below.
I believe the the original had one less resistor, probably the one across the tweeter.

There was talk in the long thread about an optional 2.2uF cap where Jeff B. responded stating
that it is not optional. I think that it was a later revision and it is not shown in these pics. Probably
goes across the series resistor to the tweeter.

Picture for the Continuum II this was for sale on DiyAudio:
Continuum II XOJPG.JPG
 
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EXAMPLE BUILDS:

Original from DiyAudio:

Jeff Bagby's Continuum Build

I think I must have gotten the (or close to) the last kit Meniscus had because the RS28A-4 tweeter is NLA, seemingly for awhile, as I notice it's been taken off of PE's site as well. Really strange because, I am not a bookshelf or small monitor type. I bought this kit on impulse, and a bit of...
www.diyaudio.com www.diyaudio.com
 
Jeff B. Wrote this at PE Tech Talk in 2014:
Edit: The Meniscus page says that they gave Jeff a small amount for each kit sold, this I'm sure was later.

I think a few things need to be clarified -

1. I have never made one cent from any Continuum that has ever been built by anyone. I do not receive royalties on the sale of any kits.

2. To the best of my knowledge every driver that has ever been ordered for a pair of Continuums came from Parts Express, including the ones in the kit from the "competitor".

3. I never made it an open source design due to the amount of research I put into the design and my desire to always reserve the right to market it in the future if I chose. That may happen, and a finished version may first be marketed to professional studios. I am already working towards this goal. This doesn't stop anyone from building a pair though.

4. It took several years before "the competitor" asked if they could put a kit together to sell. I agreed and authorized this. Parts Express never asked.

It would seem to me that Parts Express always benefits from the sale and building of Continuum kits. (I mean, I am using a Dayton tweeter here, and I have always raved about how good it is in my opinion.)

Added thought: * I wouldn't be surprised if the popularity of the Continuum is the main reason the AC130f-1 continues to be stocked at PE.

Jeff
 
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An interesting thread by Jeff in 2014 that shows the woofer front mounted in a Bamboo cabinet:
He says front mounting didn't make a big change.

The Continuums - the saga continues - Techtalk Speaker Building, Audio, Video Discussion Forum

Want a second or third opinion about your speaker cabinet design or other audio related problem? Post your question or comment on the Technical Discussion Board. Hundreds of technicians, engineers, and hobbyists, nationwide read and discuss electronics related questions each week. We welcome...
techtalk.parts-express.com

CONTINUUM BAMBOO.JPG
 
MTM AND MLTL VERSIONS:

Interesting:
Someone asked for a small MTM version and Jeff said that he designed it in simulation and sent it to
the person who asked but never heard back from them. Then later he said that he had all the parts to
build one so he might try it.

Then here in the big thread an MLTL version of the MTM is mentioned post #110:

The Continuums - the saga continues - Techtalk Speaker Building, Audio, Video Discussion Forum

Want a second or third opinion about your speaker cabinet design or other audio related problem? Post your question or comment on the Technical Discussion Board. Hundreds of technicians, engineers, and hobbyists, nationwide read and discuss electronics related questions each week. We welcome...
techtalk.parts-express.com
 
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SUMMARY OF THE SINGLE WOOFER MLTL:

"Maynard's MLTL thread is hard to find because Continuum is misspelled in the title. Here's the info he posted:

"Not sure if it was ever posted. I did note somewhere that the box is the same as the Tzu-Jan, except no slope on the baffle face and drivers on the wide side to more closely match the Continuum baffle width.

Internal height of the MLTL is 40". Internal cross section is 6.5" X 5.5". Woofer is 7.75" from the top mounted on the wide face. Port is 2" x3" mounted 2" above the bottom (internal). Stuffing is .75 lb / sq ft in the top 1/2 only.

F3 models in low40's. You can tune the stuffing and port to taste."

Main limitation of the design is power handling. A small footprint for a small room."

Maynard's Thread:

Contimuum TL Done! - Techtalk Speaker Building, Audio, Video Discussion Forum

Want a second or third opinion about your speaker cabinet design or other audio related problem? Post your question or comment on the Technical Discussion Board. Hundreds of technicians, engineers, and hobbyists, nationwide read and discuss electronics related questions each week. We welcome...
techtalk.parts-express.com
 
Being limited in my carpentry skills has kept me from exploring designs like these. I have been searching for a kit with an available cabinet or flat pack. Something like that is just over the horizon for me. I have been spending a lot of time on the Madisound site thinking about what would work best for me. I already have excellent speakers. But I am super curious about the quality and value in many of the builds offered at Madisound and PE.

It's a shame that he never profited from this design. This may be motivation for me to use one of his designs that include a cabinet or available flat pack. Any recommendations?
 
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Note that solicitations for donations are strictly prohibited here on AK.

I edited the relevant posts.
 
Jeff was such a class act! I never got the chance to meet him in person, but he was always willing to help many of us budding designers learn the ropes on the PE Tech Talk forum.
 
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Isotonic said:
Being limited in my carpentry skills has kept me from exploring designs like these. I have been searching for a kit with an available cabinet or flat pack. Something like that is just over the horizon for me. I have been spending a lot of time on the Madisound site thinking about what would work best for me. I already have excellent speakers. But I am super curious about the quality and value in many of the builds offered at Madisound and PE.

It's a shame that he never profited from this design. This may be motivation for me to use one of his designs that include a cabinet or available flat pack. Any recommendations?
Click to expand...

Jeff has done many, many designs, some with discontinued drivers but I've only heard one of his
designs and not long enough to form an opinion.
It would be great to have a thread for builders/owners to offer their opinions for best value, sound, etc.
Flat packs come and go, so I'd just check around at the various sources. A list for kit and flat pack sources
would be great.
Plans but no kits, this looks like Meniscus revived:
 
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I spoke with Mark from Meniscus in October, but don't remember if he still has his cabinet shop running. I think he's just looking to sell off the remaining stock of parts.

Brad at Jule Fidelity in Sioux Falls has a CNC and may be willing to make up a flat-pack for you. He's only part-time with the business now, so I'm not sure what his turn-around time is.
 
I just stumbled onto the Jule Fidelity site a few weeks ago, for those who don't know:
I think it is run by several guys from the MAC also on PE tech talk. MAC/DIY

Since, flat packs come and go, it would be interesting to make the CNC code available (for a small fee?)
so that builders could have them cut locally and avoid the shipping costs. I don't know much about this
but I like the idea.
Very exciting would be big designs like an M19 Econowave flatpack, Econo 12" big box, etc:
Econowave Help Needed
 
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Isotonic - you're a stones throw away from an avid speaker DIYer. Bill, who goes by 4thtry on the MAC & Parts Express forum, lives on Jackson, Wisc. Here's what he cooked up this past year -

20f041993da8a0a47b6abd5d671bc9809151b03e.jpeg
 
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