impregnable, unassailable, insuperable, indestructible, supreme, insurmountable,

irrepressible

vertical polar plot. As expected for an MT design,

there is some minor non-symmetrical about the

vertical plane. Most notably the nulls at -32

degrees and 25 degrees above the design axis.

These are far from the normal listening angles and

will present no issues in normal listening.

and as is my penchant, is slightly tilted, with the

tweeter being about 2 dB below the midrange

level. Frequencies below 200 Hz are not shown as

they are below the accuracy limits of my

measurement process.

came out looking this good. Keep in mind the

vertical lines are just a artifact of the plot. The

phase rotation actually continues downward, but at

the limits of the chart is switched up 360 degrees

so it can be easily displayed. The fact the phase is

almost perfect at the phase wrap makes for a nice

looking plot, but is not any more important than

any other frequency either side of it.

this truly is an 8 ohm design, actually spending a

significant portion of the pass band above 10

ohms. The impedance minima is roughly 7 ohms

and the worse case impedance/phase is at 55 Hz

with the phase at -55 degrees, and 13 ohms.

-MLTL impedance shown.

A two way design using top shelf drivers 3 different enclosure variations |

Sealed in Magenta,

Infinite baffle in Blue (Qtc = 0.5)

Sealed F6 = 40 Hz F9 = 30 Hz

MLTL F6 = 21 Hz.

The response is down 1.5 dB at 30 Hz.