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A lot of times the kits are 'source your own parts' style for most of the builders that design their own. Usually there are details to glean, and most are free for non-commercial use purposes, or have a small charge for plans.
If you are looking for one-stop shop types with Knock-down cabinets, your best bet is likely CSS, and Dan and Kerry will take good care of you.
Madisound and Solen both sell some kits from bigger names in the hobby as well as vendors like SB and SEAS. Usually, these do not have cabinets included, however some do. Lee Taylor, if I have the name right, makes cabs for those kits that want to pay extra for them.
Another vendor is JuleFidity out of South Dakota. Brad has a CNC, and can make cabinets. He has some kits for sale.
DIY Sound Group is another that had kits, but I don't think they are in business any longer.
Matt Grant has a kit design website.
There are many places to look, including through this forum.
Welcome!
MAC sells a small line of drivers, but that's it. Available exclusively through JuleFidelity.
Answers
Thank you for your advice. I am totally new to this. I would prefer to build my own cabinets as I have enough woodworking skills to do so, and that part of the fun. I was under the impression that MAC sold their own brand of speaker drivers and crossover components. If I misunderstood I can definitely source parts from the vendors you recommended.
There are a few kits using MAC drivers available at JuleFidelity, follow the link above.
What is your budget?
The CSS kits are very high quality, if you have that kind of money.
https://www.css-audio.com/online-store
All good advice above.
If I can add my thoughts, I suggest starting with a two way and looking at kits or designs which have relatively simple crossovers. For example, Curt Campbell's "Tritrix" and Wolf's "Zingers" have only five or six parts, which will make construction less daunting; at least, for an electronics idiot like me.
Some commercial kits such as CSS Audio and (I think) the MAC kits come with a circuit board and show where to put the parts, in which case ignore my comments.
Budget, desired cabinet size, room size and musical preferences are of course important in working out options.
Geoff
Another good source is https://www.speakerdesignworks.com/
Also
https://sites.google.com/site/undefinition/diy
If you are looking for designs, can build your own cabs and source the drivers and XO components. CSS can give you drivers and pre-made XO if you just want to make the cabs, so can Jule Fidelity for very budget friendly MAC drivers and designs.
There are a lot more but these I am familiar with.
Ben @Wolf , do you have a consolidated site for your designs? JR also does a good write up. A lot of good designs are in this forum, but you need to search for them or if you have specific criteria, budget, size, drivers etc, ask and good designs can be suggested.
Was Mark going to bring back the kits or designs? A lot of good ones were there.
I have 4 of mine posted in the 'Armada' so far over on the InDIYana website. I need to get back at that and load more into it.
I have been meaning to ask his progress in that endeavor. Not sure. I do know he is sitting on several RS28A pair awaiting a limited last run of original Continuum kits.
InDIYana Event Website