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Did you add a choke in series with the mid or was the tweeter crossed over at the point where the response of the midrange naturally falls off?
 
Tube Radio said:
Did you add a choke in series with the mid or was the tweeter crossed over at the point where the response of the midrange naturally falls off?
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I have not added a choke to the mid. I may add one later.
all of these drivers are brand new and only have a few hours of
play on them. when they loosen up some more i'll decide if the mid needs a choke.
 
Got a long way to go as I just finished cutting the baffles for my first pair of mass loaded transmission line speakers. The MDF dust is so evil I try and work outside the garage when the weather is decent. Getting tired of all this rain.

P1010001.jpg
 
70's Rockfan said:
I have not added a choke to the mid. I may add one later.
all of these drivers are brand new and only have a few hours of
play on them. when they loosen up some more i'll decide if the mid needs a choke.
Click to expand...

The best way to test that is to feed a sinewave at the crossover frequency then vary it up and down some and see if there's a point where the sinewave sounds louder.

If so a choke is needed.

If not no choke is needed.
 
Meant to say up and down in frequency some.

Also to expand more on what I said.

The sound at a crossover frequency should be about even with the rest of the sound.

If one for instance uses a woofer and tweeter with just a capacitor on the tweeter, as the crossover frequency is approached, the sound may get a little louder then return to normal as you go higher than the crossover frequency.

Same would apply with a midrange and tweeter unless the tweeter is crossed over at the point where the response of the midrange starts to fall off which isn't recommended as the response of most speakers as they approach their upper frequency limit isn't all that flat with peaks and dips in the response.

I've experimented with speakers using just a cap on the tweeter to get some idea where the crossover frequency should be and when I finalized the design and added the correct choke, the speakers always sounded much better.
 
Decided to place the BSC circuits in these cigar boxes that sit on top of the Lowther MLTL's rather than inside. That way they can be tweaked as needed rather than being totally inacessable.

P1010020.jpeg
 
FWIW I didn't realize when I started this project how big and heavy these Lowther MLTL's would be. Took my wife and I together to carry them from the garage to the house. One reason for their weight is that I used 3/4 inch MDF which is heavier and denser than plywood. They look tilted in this picture but that's the way I was holding the camera. When I asked my wife what color should I paint them she replied, "any color as long as it's black".

P1010015 3.jpeg
 
Poultrygeist said:
FWIW I didn't realize when I started this project how big and heavy these Lowther MLTL's would be. Took my wife and I together to carry them from the garage to the house. One reason for their weight is that I used 3/4 inch MDF which is heavier and denser than plywood. They look tilted in this picture but that's the way I was holding the camera. When I asked my wife what color should I paint them she replied, "any color as long as it's black".

View attachment 1865824
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I bet they sound great. How do you have them stuffed? I need to get back into my MLTL's and remove some fiberglass to let the woofer sound a bit better (15" Altec). I have some Fostex single drivers in complex horns that really become transmission lines when in use. No stuffing used except for a piece of wool in back of the driver.
 
westend said:
I bet they sound great. How do you have them stuffed? I need to get back into my MLTL's and remove some fiberglass to let the woofer sound a bit better (15" Altec). I have some Fostex single drivers in complex horns that really become transmission lines when in use. No stuffing used except for a piece of wool in back of the driver.
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The stuffing is poly-fill inside a cheese cloth sleeve which covers the cavity from the drivers to just above the port. After weighing the stuffing my dear wife sewed it into the sleeve. With the cross laced twine the sleeve stays in place. I can't get over how wonderful these speakers sound.

P1010012.jpeg
 
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Poultrygeist said:
Decided to place the BSC circuits in these cigar boxes that sit on top of the Lowther MLTL's rather than inside. That way they can be tweaked as needed rather than being totally inacessable.

View attachment 1865711
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Hey P, those look great....I mean the finished speakers. What is a BSC circuit? From all the pics they look like just a bass reflex box. Is that right? How is the bass?

Just starting on mine today and will post pix.
 
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