In Reply to: Rear Firing Ports & Placement posted by Peter Qvortrup on November 21, 2007 at 04:14:55:
"Our experience is that as you move the speakers closer to the room boundaries the effects of the room are reduced rather than the opposite..."
Let me see if I understand this (for although I use rear-firing ports, I don't claim to know as much about them as you do).
It seems to me that the acoustic environment up close to the room boundaries will be more similar from one room to the next than will the acoustic envioronment out away from the room boundaries. So, placing the port on the rear of the enclosure will put it as close as possible to the room boundaries with proper placement, and therefore give you more consistent low end from one room to the next. Is this correct?
Not sure if you noticed, but elsewhere in the thread I acknowledge that I'm copying you in using rear porting. By any chance have you considered making the port length user-adjustable, for applications where the user cannot take advanage of the corner placement your speakers are tuned for? For instance, a 3" diameter modular flared Precision Port with an overall length of about 9 inches would tune the AN-E to 29 Hz, which I think is its normal tuning frequency. By removing the center section the tuning is raised to about 34 Hz, and by using only the outer flare the tuning is raised to about 41 Hz. The sections can be held together with a single wrap of electrical tape instead of glued together, and the port itself affixed to the enclosure by four small screws - so it's user-adjustable. Hey I'm using your idea - the least I can do is offer you my variation on the theme.
Best wishes,
Duke
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Follow Ups
- RE: Rear Firing Ports & Placement - Duke 00:21:27 11/22/07 (3)
- Room Placement & Rear Ported Speakers. - Peter Qvortrup 03:32:47 12/16/07 (0)
- RE: Rear Firing Ports & Placement - theaudiohobby 03:44:18 11/22/07 (1)
- RE: Rear Firing Ports & Placement - Duke 12:24:26 11/22/07 (0)