easiest way for voice coil alignnent - Page 2

Dr.EM · 16th February 2009, 06:37 PM

Is the best way to ensure things are aligned well to install the drivers in the baffle/enclosure and play a tone at crossover frequency with one driver out of phase. Then adjust the delay/phase for maximum null before putting the polarity back as it should be? Microphone presumably lined up at listening posistion/tweeter height. Driver output levels would need to be matched without moving the mic first.

John Sheerin · 16th February 2009, 06:51 PM

No, not if you want best time alignment. That ensures good phase alignment, but you could be a full wavelength apart (or some other multiple). I'd play a sine wave at the crossover frequency and look at the difference in delay for each speaker from an electrical reference (the reference signal in a two channel measurement setup). Line them up that way and then fine tune using reversed phase.

Dr.EM · 16th February 2009, 07:32 PM

Ok, yes, I understand

I am unlikely to be a full wavelength or more out with my driver arrangements so that should be fine. The crossover will mess up time alignment if it's 24db LR anyhow, I think? Phase alignment is probably what I'm after really.

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16th February 2009, 06:37 PM	#11
Dr.EM diyAudio Member Join Date: Oct 2006 Location: Swindon	Is the best way to ensure things are aligned well to install the drivers in the baffle/enclosure and play a tone at crossover frequency with one driver out of phase. Then adjust the delay/phase for maximum null before putting the polarity back as it should be? Microphone presumably lined up at listening posistion/tweeter height. Driver output levels would need to be matched without moving the mic first.

16th February 2009, 06:51 PM	#12
John Sheerin diyAudio Member Join Date: Nov 2003 Location: Pittsburgh, PA	No, not if you want best time alignment. That ensures good phase alignment, but you could be a full wavelength apart (or some other multiple). I'd play a sine wave at the crossover frequency and look at the difference in delay for each speaker from an electrical reference (the reference signal in a two channel measurement setup). Line them up that way and then fine tune using reversed phase.

16th February 2009, 07:32 PM	#13
Dr.EM diyAudio Member Join Date: Oct 2006 Location: Swindon	Ok, yes, I understand I am unlikely to be a full wavelength or more out with my driver arrangements so that should be fine. The crossover will mess up time alignment if it's 24db LR anyhow, I think? Phase alignment is probably what I'm after really.