AviaTrix MT:

[brianbunge]

Re: AviaTrix MT:

Curt,

I have been playing around with ported designs for a single 140 and 21L tuned to 35-40Hz and "heavy fill" looks pretty good with a gradual rolloff. I don't know how closely this matches up to an MLTL response, but it does look interesting.

[curt_c]

Re: AviaTrix MT:

Brian,

I modeled the MT MLTL in MathCAD. Internal dimensions of 6" x 42.5" x 5.75"d.
The port is 2" x 5" without flares. 1/2 lb of stuffing per enclosure suggested.
Here's the plots:

C

[PWR RYD]

Re: AviaTrix MT:

Curt,

I sketched up the crossover schematic from your layout drawing. Did you intend to have the tweeter padding resistors between the series cap and the shunt coil? Also on the woofer filter, did you intend the high pass series cap to be located between the series inductor and the shunt cap? Not saying it's wrong, just checking.

Here is what I drew:

[curt_c]

Re: AviaTrix MT:

Nicely drawn Craig. Thanks for posting it for the forum members.

The great thing about components in series is that it doesn’t matter what order the components are in. I put the components in the order that lay out well for me on the crossover board. If it makes more sense to reverse them in your layout, that’s fine as well. There will be no difference in the functionality of the network as a result.

C

[PWR RYD]

Re: AviaTrix MT:

Yes I agree that the order of the series inductor and capacitor in the low pass circuit does not matter. However I'm not so sure about where the padding resistors are in the high pass circuit. How would I model that in PCD? I know how to model a series resistor before or after the filter, but how do you do it when it's in the middle of a 2nd order filter? Again, I'm not saying it's wrong, just trying to get my brain around it. Thanks.

[curt_c]

Re: AviaTrix MT:

Just model it in front in PCD.

C

[lostboy77]

Re: AviaTrix MT:

Someone please correct me if I'm wrong but I seem to recall that in the MTM version, the 500 uF caps are supposed to be removed from the XO when building for the MLTL towers (as they are only necessary for the small, sealed enclosures).

Shouldn't the same 500 uF cap (there is only one here because the MT is an 8 ohm design) also be removed for the MT MLTL tower?

If not, than my understanding of what that 500 uF cap does is way off base.

[curt_c]

Re: AviaTrix MT:

You are spot on. The 500 uF cap is in the sealed version, and is deleted in the MLTL version. I apologize if I misrepresented this bit of data somewhere...

I've been fleshing out the design write up on my webpage, and hope to find time to finish it sometime this long weekend. Its rather long as it encompasses the four different variations of the concept.

Here's a link to the MT drawings page. Some of the links take you to the other AviaTrix pages, but some are not linked properly yet. I've got a few pages to go yet, as well as adding the link from the main page.

http://speakerdesignworks.com/AviaTrix_6.html

C

[exojam]

Re: AviaTrix MT:

Well my daughter was nice enough to order my enough items to convert my RB surrounds to the AviaTrix MT for Christmas.

Unfortunately PE did not send me the four 500uf caps; instead I got eight .47uf caps. I sent over an e-mail to have this corrected which I am sure they will take care of when they are open after the holiday.

I cannot wait until I have these up and running.

James

[curt_c]

Re: AviaTrix MT:

Merry Christmas James!

You only need a single 500 uF cap for each of the MT's. If you can't wait, they can be run without the caps until you get them. A little more ripple, a little less extension. Try it both ways and see which works the best for you.

C

[exojam]

Re: AviaTrix MT:

Curt,

Thank you and Merry Christmas to you and your family.

I have sent PE an e-mail notifying them of the mix up. I will wait until the 4 500uf caps arrive and then build the crossovers.

It will be very nice when these are up and running since that will give me a complete speaker set designed by you and Wayne.

James

[exojam]

Re: AviaTrix MT:

Curt,

PE has all ready contacted me (I go the e-mail when I came into the office this morning) and will be sending out the correct caps.

Great customer service from PE!

James

[parodielin]

Re: AviaTrix MT:

Quick question, is it necessary to chamfer the woofer cutout (on the back of the baffle of course) given that it's a 3/4" baffle? (Trying to eliminate unnecessary work.. ^_^ ) It doesn't show that on the drawing just doublechecking...

Also, I don't need internal bracing either with 3/4" MDF all around. Or would it help to add a 3/4" think, 2" width horizontal "stick"?

[bmaupin]

Re: AviaTrix MT:

Quick question, is it necessary to chamfer the woofer cutout (on the back of the baffle of course) given that it's a 3/4" baffle? (Trying to eliminate unnecessary work.. ^_^ ) It doesn't show that on the drawing just doublechecking...

Also, I don't need internal bracing either with 3/4" MDF all around. Or would it help to add a 3/4" think, 2" width horizontal "stick"?

Chamfer & bracing - yes, especially the chamfer. After cutting the woofer hole, insert woofer and view from rear ;). I built a pair of MTs with the ND140 and when you end up hearing how nice they sound and the amount of bass from them you'll be glad you did things right.

[parodielin]

Re: AviaTrix MT:

Chamfer & bracing - yes, especially the chamfer. After cutting the woofer hole, insert woofer and view from rear ;). I built a pair of MTs with the ND140 and when you end up hearing how nice they sound and the amount of bass from them you'll be glad you did things right.

Did you use the same tweeter as Aviatrix or something else?

I have no doubt it's a good system. I'm just asking whether bracing and chamfer would make a difference in such a small box, 3/4" baffle, and small driver.