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View Full Version : Microbe crossover help


samdee
03-23-2006, 09:15 AM
Has anyone build a Microbe MTM and has pictures of the finished crossover board? This is my first attempt at building a crossover and I'd like to see how all the components laid out on the board.

I'm having a tough time squeezing all the components on to a 4.5" X 9" board. This is the maximum size I can make it.

Thanks.
romanbednarek
03-23-2006, 11:16 AM
http://rjbaudio.com/misc/Microbe%20SE25%20MTM%20-%20xover%20layout.JPG


> Has anyone build a Microbe MTM and has
> pictures of the finished crossover board?
> This is my first attempt at building a
> crossover and I'd like to see how all the
> components laid out on the board.

> I'm having a tough time squeezing all the
> components on to a 4.5" X 9"
> board. This is the maximum size I can make
> it.

> Thanks.

I'm not sure which version of the Microbe MTM you are building (there have been so many), but below is a picture of the layout for the Microbe SE 2.5 way MTM design (which uses the Seas 22TAF/G tweeter). The TB T25-1166S version should be similar with a few parts substitutions. Let me know if you need further asssistance.
samdee
03-23-2006, 11:39 AM
I am building the Microbe MTM with a 2 ohm resistor (8 - 16 ohm resistors) and it has a big Erse 3mH inductor. These two components are taking up quite a bit of real estate!
romanbednarek
03-23-2006, 01:56 PM
http://rjbaudio.com/misc/Microbe%202.5%20way%20MTM%20w-2ohm.JPG


> I am building the Microbe MTM with a 2 ohm
> resistor (8 - 16 ohm resistors) and it has a
> big Erse 3mH inductor. These two components
> are taking up quite a bit of real estate!

I haven't drawn up a crossover component layout for that version yet and I see how it can be a bit crowded. I would add 2.5" to the right of the diagram shown in the previous post and you'll have to fit the 3mH inductor and the LCR filter as well in that space. The 2 ohm resistor can be connected from the binding post terminal to the crossover board because it is in series with the entire speaker.

This another "unusual" circuit that I came up with. I was unsure how much power the 2 ohm resistor had to handle. It was my attempt to turn a 4 ohm speaker (87dB sensitivity) into a 6 ohm speaker (84dB sensitivity) and get the same response. There are cons to using a resistor in series with the woofers but it is better than burning up your amp.