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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: Bass reflex with port on the front or on the back ... any difference ? posted by beppe61 on December 7, 2014 at 07:08:56:
Audible differences - but usually the room modes will mask the differences. At the port resonance the output is 90 degrees out of phase with the woofer. Depending on the tuning - the woofers output has probably dropped well below that of the port (or passive radiator output.
If you use a rear port - and the loudspeaker is placed with the port very close to a wall (less than the port diameter - is a good rule of thumb) then the base tuning could be effected - unless it was compensated in the tuning of the speaker. Side and front port openings alleviate this.
Many, including Linkwitz, and others (myself included) think ported woofers and subwoofer just make the response of the loudspeaker in the room (due to the room modes and various phases of the output radiators) and their impulse responses less predictable.
Ported speakers use the reactive energy that is stored in the cabinet to extend the bass lower without requiring more drivers or power. This also reduces the distortion of the loudspeaker system. My choice is to use more woofers - always two sealed subwoofer cabinets or more and usually two woofers per sub cabinet in a push pull arrangement (to also reduce distortion). Place the subwoofers at the sides or center front and back of the room - not in the corners - to reduce the amplitudes of the room modes.
"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius
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Follow Ups
- Ther may be.. - BigguyinATL 06:50:26 12/08/14 (1)
- RE: Ther may be.. - beppe61 04:47:22 12/09/14 (0)
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