LithMTM

[joeybutts]

Re: LithMTM

that's fine, my woofer holes are a bit wider than your drawings, just wanted a ball park. Feel free to double check for the sake of updating the schematic. I can't wait to get this thing going!

[scottsehlin]

Re: LithMTM

Confirmed: It is a 1" offset.

[joeybutts]

Re: LithMTM

Thanks Scott!

[scottsehlin]

Re: LithMTM

There has been a request to show how I laid out the crossover. I used a separate woofer and tweeter board with the tweeter board mounted to the rear of the cabinet (on standoffs from a biwirable terminal cup) and the woofer board mounted to the bottom. Instead of opening them up to take a picture, I thought it would be easier to follow if I sketched out a quick diagram. Gray circles are soldering points.

[woodsart]

Re: LithMTM

There has been a request to show how I laid out the crossover. I used a separate woofer and tweeter board with the tweeter board mounted to the rear of the cabinet (on standoffs from a biwirable terminal cup) and the woofer board mounted to the bottom. Instead of opening them up to take a picture, I thought it would be easier to follow if I sketched out a quick diagram. Gray circles are mounting points.

Thanks Scott, these crossover pics are fantastic and necessary for the "speaker builders" that have no Schematic knowledge!

Thanks for taking the time,

Robert

[dkalsi]

I have parts on hand to build the Lithium MTMs - but wanted to know if anyone who has built the design experienced any port noise? Utilizing Mr. Bagby's Woofer Box and Circuit Designer spreadsheet, predicted port air velocity is 38m/s at 43hz with just 15watts of system power. At 35-watt system power, the woofers would be reaching their x-max, and at that point, predicted port velocity is 58m/s. Now I understand that the prediction is for a sine wave signal, and audibility will be much less with music - but still, 58m/s at 35 watts (or even 38m/s at 15 watts) seems awfully high.

[Chad2]

Awesome build!

[Chris Roemer]

If you're not comfortable w/1.5"d x 4", go w/2" x 8".
(I used a 2-1/2"id port on my "ntns".)

[scottsehlin]

In practice, I have found the LithMTM to handle power quite well. One of the applications I use them for is larger outdoor gatherings. They aren't very sensitive, so I run them with a pro amp - but they can bring the party to the neighborhood without noticeably straining, which is impressive for their size. Chuffing hasn't been a problem with the PE 1.5" flared port. As Chris mentioned you can probably go with a 2" port to be safe, but the fit will be a little tight and I don't think you will need it.

[dkalsi]

Thanks Scott/Chris - I actually ended up checking with another forum member who had built the speakers and they also confirmed that the couldn’t not hear any port noise despite blasting the system at insane volumes. Sent from my iPhone using Tapatalk