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But then someone mentioned in another thread the dreaded comb filter effect when two small drivers are put on top of each other. I don't have a clue how to figure which frequencies are affected by the comb filter.
One of the reason for full rangers is that everything is in phase. I think that matters. However, to fortify some of the lower frequencies, some full rangers run in 1.5 format where the 2nd drive runs with a high frequency cutoff such as running from 400hz and below. I'm told that the 2nd driver runs 90 degree out of phase with the top full range.
The phase not would be 4.5º? instead 45ºImpedance Z 100.31736890515 ΩPhase φ 4.5587556360199 degree
Juuuust checking back in and grateful to see so many more responses. So.... given that there are phase shifts, but varies at different frequencies and different decibels, what is the bottom line - do you guys think that it make an obvious difference to the listener? I realize this is going to vary from listener to listener but wonder if there's a general concensus. Roscoe65 notes that his 1.5 is not as transparent and I wonder if the phase is the reason. Again, thanks. I think we're pretty close the end of this thread's life....
Hi, I recently got hold of a pair of single driver speakers. Each speaker has 2 identical drivers so I think it’s a 1.5 design. What I find interesting is that despite each speaker having 2 identical drivers with no crossover the two drivers don’t sound the same (ie the bottom driver clearly doesn’t play higher frequencies). Initially I thought this to be a defect but based on the discussion I understand that’s actually normal, correct? Or are there different designs and it depends?
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