Given the proper measurements, I can help you establish or confirm the XO settings and the driver delays needed to provide close phase tracking through the XO range. My approach uses IIR (minimum phase) XO filters.
Would you like me to detail the needed measurements?
Per your interest in an optimized design, first let's first investigate the best XO frequency and slopes to achieve an LR-24 acoustic XO. If you have advice on what filter settings to use from other sources we can start with those. Lacking that, I would suggest we investigate a little ourselves. We can skip this preliminary investigation if you care to.
> Set XO filters to target value (450 Hz?). [We'll use the value of the passive XO design initially.]
> Set HPF (horn) to LR-12/450 and LPF (woofer) to LR-24/450. [initial guess of the filter slopes needed to approach an LR-24 acoustical XO.]
> If you have already set relative driver SPL levels and PEQ settings for the Khorns it is good to leave those settings active.
> Neither Loopback Timing nor Acoustical Timing is needed for this analysis.
> Set sweep range 20-20k Hz
> Chose the speaker to measure, right or left.
> Place mic about 1.5 m from the baffle, ~36" above the floor and located on the listening axis (line-of-sight from LP to the mid horn. [This will be roughly 15° off of the speaker's central axis as the speaker is toed-in ~45° and the LP is only toed-in roughly 30°. It's fine to use the speaker axis instead because the impact of this is probably trivial.]
> Measure the woofer response alone.
> Measure the mid-horn/HF horn alone.
Post the mdat of the 2 measurements here. We will be looking to see if the chosen XO filter settings results in driver responses that approach LR-24 filter shapes. We may want to change the filter settings to improve the result if needed.
After we determine the filter settings we can then proceed to set the delay needed.
I might need you to do me a favor and NOT rant too much about how amazing it is... I can't afford one right now.Ok John,
I was able to get everything connected and just put in the xovers and the slopes, WOW!!! what a difference. This already sounds better than before and I have not even touched it yet!!! The overall sound is clearer and the bass has much more authority, so I am pretty excited right now and looking forward to measurements and adjustments. As soon as I am able I will get started...