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In the Forum: Horn-Loaded Speakers
In the Thread: Driver Alignment, and Where to Draw the Line
Post Subject: I have writhen about it before somewhere.....Posted by Romy the Cat on: 5/27/2007
It is very easy to figure out acoustically. Feed the drivers and their crossover with a reference tone of fixed amplitude and fixed frequency, roughly in the middle of crossover point. Disconnect one of the drivers and measure the acoustic pressure exactly at your listening spot with your RTA or scope. Now connect another driver and see what happen with amplitude, you need approximately +3dB, if your tone is in middle, or as much as you can get. With both driver on, take one of the drivers and begin to slide it further and closer from your listening position until you found the maximum gain from both drivers. You will start with sliding it within inches and eventually, the closer you go to the point of aliment, you will slide it within a few millimeters. Since you are at relatively low frequency (the bottom of your compression driver) then there is not danger that you hit the summit of the next cycle. The point of the maximum gain, where the peaks of the cycles wills expand each other will be your time alignment spot. Mark the fixation of the both driver. BTW, be advised that turning the drivers on their axes also very aggressively affects aliment. I am against of any angling of the axes with horn installations horns with exception of the LF channels, where it becomes irrelevant. I know, I know, many people do it. GOTO does it, Cessaro does it. Many other manufactures and private parties do it. I disagree with them and I feel that in horn system the axes MUST be absolutely parallel.Rerurn to Romy the Cat's Site