Reply to thread

Message

<blockquote data-quote="Per SÃ¸vik" data-source="post: 65125" data-attributes="member: 1285">Re: First time Centre SubsSorry if I&#039;m confusing you, but when you get under 1/4 wavelength, you may gain some efficiency, so on-axis might show a small gain because of this. Off-axis you are loosing cancellation, at quarter wavelength, maximum cancellation is 3dB, so it is pretty omni-directional.On-axis doesn&#039;t really change that much, except for a minute change in the angle between the sources, untill the sources are close enough together to interact in a way that changes the acoustic resistance the units experience.Edit: Too confusing, here are some illustrations: If you look closely, you&#039;ll see that on-axis is unchanged, the changes in directivity is due to off-axis cancellation[ATTACH]150904[/ATTACH] 1/4 wavelength[ATTACH]150905[/ATTACH] 1/2 wavelength[ATTACH]150906[/ATTACH] 2/3 wavelength[ATTACH]150907[/ATTACH] 1/1 wavelength</blockquote>

[QUOTE="Per SÃ¸vik, post: 65125, member: 1285"] Re: First time Centre Subs Sorry if I'm confusing you, but when you get under 1/4 wavelength, you may gain some efficiency, so on-axis might show a small gain because of this. Off-axis you are loosing cancellation, at quarter wavelength, maximum cancellation is 3dB, so it is pretty omni-directional. On-axis doesn't really change that much, except for a minute change in the angle between the sources, untill the sources are close enough together to interact in a way that changes the acoustic resistance the units experience. Edit: Too confusing, here are some illustrations: If you look closely, you'll see that on-axis is unchanged, the changes in directivity is due to off-axis cancellation [ATTACH=CONFIG]150904.vB5-legacyid=4921[/ATTACH] 1/4 wavelength [ATTACH=CONFIG]150905.vB5-legacyid=4922[/ATTACH] 1/2 wavelength [ATTACH=CONFIG]150906.vB5-legacyid=4923[/ATTACH] 2/3 wavelength [ATTACH=CONFIG]150907.vB5-legacyid=4924[/ATTACH] 1/1 wavelength [/QUOTE]

Verification