Modified XLi Class A/B with internal active filtering. I've got a Crown Class D with DSP coming next week and will have shoot out between the two.
http://northreadingeng.com/XLiSeries/LF_XLi_amplifier.htm
http://northreadingeng.com/XLiSeries/LF_XLi_amplifier.htm
A few photos of the active filter board and its installation in the amp, this case an XLi1500.
Plots shown below:
1. Response with filter set for bass horn applications (blue curve, no filter).
2. %THD as a function of power over range of pass-band frequencies, top to bottom 400, 300, 200, 100, 50Hz.
3. Measured response on Klipschorn bass unit with and without the filter active. Bass horn responses taken over a range of front panel pot settings.
Plots shown below:
1. Response with filter set for bass horn applications (blue curve, no filter).
2. %THD as a function of power over range of pass-band frequencies, top to bottom 400, 300, 200, 100, 50Hz.
3. Measured response on Klipschorn bass unit with and without the filter active. Bass horn responses taken over a range of front panel pot settings.
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