Hi All,
When I built my 4333 project this summer, I decided to bi-amp using a Rane AC22 active crossover to split the signal for low and mid/hi. I used the
Nelson Pass L300/4333 mod to build a passive crossover for the mid/hi and just decided to eliminate the low frequency circuit.
Now I want to experiment with crossover frequency but I'm afraid that the passive crossover still has a low pass filter for 800hz for the mids. If I use my active crossover to change to a 500Hz crossover point, for instance, will that leave me with a gap between 500Hz and 800Hz? If so, how would I modify the crossover circuit to allow me to actively change the crossover point between low and mid?
Does that make sense? I assume that the low frequency circuit only has a hi-pass filter and the high frequency circuit would only have a low-pass filter but the mid-range would have both low and hi-pass filters.
FWIW - the bass does sound thinner when I crossover at 500Hz. I'm using a tubed dynaco ST-70 (35wpc) for the mid/hi end and a solid state Sansui AU-7500 (32wpc) for the bottom end (until I get my Crown D150A Series II back from the shop).
You can see the Nelson Pass Crossover schematic here:
http://www.firstwatt.com/pdf/art_l300.pdf
Thanks in advance for your advice.