First Impressions of the Mundorf AMT25CM1.1-R

I was so excited to get one of these in the mail I wanted to start blogging right away.  I'll cover the response and harmonic distortion measurements in a future posting. 

  Electrical

Based on my handy dandy DATS V2:

 Fs = 1666
Re=6.105
Le=9.47 uH

As expected with such low inductance, the phase plot is practically flat.  Highest measured impedance was around 6.4 ohms at resonance.  Compared to dynamic drivers, this is a remarkably simple and resistive load.

Mechanics

The mechanical drawing, while accurate, doesn't really do the size of the body justice.  The body is really big about the size of some laptop chargers and the flange top/bottom are small and difficult to cut for. 

The front of the tweeter.  Sorry about the rotation.  Note blemishes are due to the plastic shipping film still being on. Kind of a boring shot.

Here is a side view of the tweeter where we can see just how monstruous the body really is.  Mundorf provides a rubberized pad on the flange. 

Here are a couple of interesting things.  Unlike my expectations, Mundorf provides full sized banana jacks and a pair of banana spring clips to attach speaker wire to. I  was expecting spade lugs or quick disconnects.  The left edge is the bottom of the tweeter. Notice the big difference in the width of the flange on the sides (top) vs. the top and bottom (left).  As Lee Taylor of Taylor Speakers pointed out, this can be a real bothersome situation for a cabinet maker.  I suspect the choice was to make this tweeter more palatable for line-array speakers.   In fact I'm kind of tempted to start working on one next.

Also, the corner radius are very small and non-standard 4mm.  Just to be nice, I'll throw in the dimensions below.  As you can see there, there is a 5mm spacing on the top and bottom flanges.  That's not a mistake.  One last comment, the housing is rater flimsy.  It feels like a thin version of the poly carbonate material in the uber-expensive suitcases being sold today and there is no visible way to remove it.  Speaker makers using this would probably want to encase the driver in it's own, well damped, sub cabinet.