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In the Forum: Playback Listening
In the Thread: Dpols?
Post Subject: HMMMMMPosted by rowuk on: 7/24/2020
I must be missing something - or not be ready for this yet. Here are my understanding problems:
1) he starts with the "left" speaker and searches for the best bass. I would think that one should search individually with the left and right and pick the better of the two as everything else depends on the initial bass quality achieved. It would be interesting to know if a full sized speaker and a stand mounted "mini monitor" of similar height would get the same X/Y coordinates in a room. Is DPOLS a position involving X/Y and Z coordinates? What happens with a MTM configuration?
2) after both speakers get their X/Y coordinates, toe in is supposed to compensate for the virtual image position shift caused by early reflections. Even without horns, the off axis response of many speakers is not flat and asymmetrical toe in would lead to other issues - at least in my mind.
3) I wonder how much his "rake angle" is actually help to get some semblance of acoustical time alignment from standard speakers where all drivers are mounted on the same motor board.

IF DPOLS is a "LF" event, do we even need to position the melody range and HF at that same place?

I am sure that Bob Robbins would learn a lot with a system like Romys. If in fact this is the same as DPOLS (I have my doubts), a method for finding the position based on LF and mono image size based on toe in with playback height based on rake angle (or perhaps adjustment of physical time alignment) is a handy thing for evaluation...

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