*Second-order Elliptic Equalizer First Build*

**Crosstalk Curves for 75, 150, 300 Hz**

Left-only input.

Top trace is left out.

Bottom traces are the right channel output with the EEQ switched from 75 to 150 and 300 Hz.

*Second-order Elliptic Equalizer Crosstalk Curves for 75, 150, 300 Hz*

**Comparison of 6 dB vs. 12 dB Per Octave Lateral Versus Vertical Response**

Left-only input. EEQ set at 300 Hz.

Top trace is lateral (mono) response.

Bottom traces are the vertical output with the EEQ plotted at 6 and 12 dB per octave.

*Second-order Elliptic Equalizer Lateral vs Vertical at 300 Hz with 6 or 12 dB per octave slope*

**Comparison of 6 dB vs. 12 dB Per Octave Crosstalk Response**

Left-only input. EE set at 300 Hz.

Top trace is left out.

Bottom traces are the right channel crosstalk with the EEQ plotted at 6 dB and 12 dB per octave

*Second-order Elliptic Equalizer Crosstalk Comparison at 300 Hz with 6 or 12 dB per octave slope*

I'll be posting some sound files soon.

**Conclusions**

1) The steeper highpass slope of the EEQ's second-order vertical response permits, for the same amount of filtering, a lower EEQ frequency to be used.

2) The steeper low pass response of the second-order crosstalk curve improves midrange separation and imaging.

3) Factors 1 and 2 in conjunction lower the crosstalk significantly to maintain midrange stereo imaging.

4) The summed output is mono compatible.

**Applications**

The applications for the EEQ include vinyl cutting, "bass focus" to improve low-end on headphones, earbuds and small speakers, subwoofer steering and vinyl playback warp reduction.