AviaTrix MT:

[Chris Roemer]

You'll most likely lose dispersion (above some freq.), making it behave like a larger driver - from a "beaming" standpoint.
And you'll definitely alter the phase tracking between the drivers.

[giverago]

Bringing back this old thread. How badly would rear mounting the woofer to the baffle effect the crossover?

[exojam]

Re: AviaTrix MT:

Matt,

I found the old thread where Nick was selling these cabinets and it is a 3/4" round over. The thread is below if you want to look.

James

http://techtalk.parts-express.com/showthread.php?t=209396&highlight=Recession+Buster

[exojam]

Re: AviaTrix MT:

Matt,

I did not build the cabinets. Nick made these when the Recession Buster first came out and there was a lot of interest in them.

James

[matt996]

Re: AviaTrix MT:

Also a picture of two finished ones.

I like the looks of those ... what size of roundover did you use?

Matt

[exojam]

Re: AviaTrix MT:

Some pictures of the crossovers laid out but not soldered. Also a picture of two finished ones. These cabinets had my Recession Buster before. As you can see there are some scratches-indentations from the original woofers but since these are surrounds I am not to upset about it. Now I just need to get these mounted and finish the other two (probably next weekend).

James

[curt_c]

Re: AviaTrix MT:

Was the similarity of the two enclosures a fortuitous coincidence?

We took into consideration the possibility some builders would want a pre-built cab option when we designed the MT cabs.

Although our test prototypes were built by Wayne, any of PE's .25ft^3 2way enclosures are usable with the AviaTrix MT design.

C

[rbrockman]

Re: AviaTrix MT:

How would the curved PE .25 ft³. cabinet work for this design?

It's dimensions are 12" H x (7.5" Front, 4.5" Back) W x 11" D and .283 ft³. Baffle width is exact and and height is within 1/2 inch.

[curt_c]

Re: AviaTrix MT:

Everything makes a difference. The question is: Does it make an audible difference?

We didn't feel that bracing in the MT enclosure would be that much of a benefit, presuming 3/4" MDF was utilized. However, the chamfer/scalloping of the rear of the ND140 is well worth the additional 5 minutes it will take to accomplish.

I'd recommend it as a rule of thumb to accomplish in most any design.

C

[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.

[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:

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"?

[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

[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

[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