Was that $800 for everything or just the drivers n crossovers? What did you gain by going w/ the ribbon tweets?
I believe that $800 includes everything he spent so far, including lumber, paint, varnish, sand paper, etc.
There are two versions of the ER18 MTM towers, one with a Fountek ribbon tweeter, and the other with a high quality 1" dome tweeter. There are crossovers custom designed for each design.
The
details are in this post. The parts & prices for drivers, crossovers, vent tubes, binding posts, and cabinet feet are shown below. The bottom line in each table shows the total cost.
Parts List for Ribbon Tweeter version (Fountek Neo Cd3.0 M)
Parts List for Dome Tweeter version (Dayton RS28F)
I was looking at the TriTrix MTM TL but after checking it's only 5" drivers and I'm afraid that won't be enough low end for me. I really wish that option GranteedEV threw out but the woofers are gone. I'd like to stay below $400 on the drivers and crossovers for this one. Then, if it's not too frustrating for me, I'll build something better for my home theater.
Any suggestions? Hoping for a tower but I am open to different ideas. Maybe it's time for another thread?
I haven't heard the TriTrix, but the designer has an excellent reputation among DIY builders, and I believe it should sound very good. The kit is sold by Parts Express at a price that makes it a great deal. It is designed for new DIY builders, and can be bought as a complete kit including pre-cut MDF pieces for the cabinet. You can also buy the parts alone and build your own cabinet from their plans.
I think it would be a great way for you to start. Because it is a widely known and popular design, you could easily sell it and build something else for yourself later.
You had also asked what is a transmission line?
A transmission line (TL) cabinet is different way designing a cabinet to reinforce lower bass. The other ways are sealed or ported cabinets. TLs work like the pipes in a pipe organ, and when designed correctly, produce superior sounding bass compared to the other two methods. Untill recently, designing TLs was difficult and required lots of trial & error. Construction is also more complex, and as a result, TLs have rarely been seen commercially. Generally a TL cabinet will be large, as in a floorstanding tower.
As far back as 1970 (maybe earlier?) people developed math formulas that made designing sealed or ported bass cabinets easy and predictable without requiring trial & error with real wood. That is why there are so many sealed or ported cabinets around today. Only recently did similar math become available for TL design. Do a google search for Martin J. King to read more.
The TriTrix cabinet, as well as the ER18 MTM cabinet were both designed using this recently developed method. For DIY speaker builders, I think it is clearly worth building TLs.