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Rear ports for PA speakers? [message #34758]

Tue, 15 January 2002 15:42

RyanH
Messages: 20
Registered: May 2009

Chancellor

Is there any disadvantage to putting rear ports on stand mounted 2 way PA speakers? I plan on building some with 15" Eminence Kappa 15LFA woofers, and since these need to be easily lifted, I don't want the sides (i.e. handles on the sides) too far apart. I want to make the baffle as narrow as possible (to an extent) and put the ports on the back. Would this do any harm? they will most likely be out in the room a little, I can't imagine them being jammed against a wall or something. Another option is to just put them under the woofer (not offset to the side), this would work too, but I just want to know all of my options. Thanks!
--Ryan

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Ports in the back why not? [message #34759 is a reply to message #34758]

Tue, 15 January 2002 18:16

Robert Hamel
Messages: 93
Registered: May 2009

Viscount

For what its worth I have 6 pairs of reflex speakers. 3 are front 2 are rear and one points at the floor. Doesn't seem to matter as long as they have room so they are not blocked. Both my centers are rear facing too.

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Helmholtz resonators aren't "picky" about placement [message #34765 is a reply to message #34759]

Tue, 15 January 2002 22:02

Wayne Parham
Messages: 18677
Registered: January 2001

Illuminati (33rd Degree)

Port placement isn't critical except in some cases where standing waves come into play. If the cabinet is tall and thin, it will develop pipe resonance and if the port and/or driver are positioned in a node, then it can cause a response peak to form. But other than that, port placement doesn't matter.

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