keep_hope_alive
Premium Member
Acoustics Engineer
thanks for the well thought-out response.
sounds like we are in agreement on just about everything... it's just the semantics of "efficiency", which doesn't matter. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
i agree that the subs "see" about 2/3 of the enclosure in a common chamber, so you do save a lot of space. and i prefer a well tuned enclosure of proper size over cramming separate enclosures that are too small. i also like that, if properly designed, the rear waves are coherent in the port. granted, this requires each sub is the same distance from the port opening. easy to do with 2, difficult if not impossible with more than 2.
i feel that port placement in common chamber designs is critical as it affects pathlength for each sub. you want the rear wave from each sub to combine in-phase (coherently) in the common port.
i see this neglected in some designs. i'm not sure that software even takes it into consideration.
thanks for the intelligent discussion. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
sounds like we are in agreement on just about everything... it's just the semantics of "efficiency", which doesn't matter. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
i agree that the subs "see" about 2/3 of the enclosure in a common chamber, so you do save a lot of space. and i prefer a well tuned enclosure of proper size over cramming separate enclosures that are too small. i also like that, if properly designed, the rear waves are coherent in the port. granted, this requires each sub is the same distance from the port opening. easy to do with 2, difficult if not impossible with more than 2.
i feel that port placement in common chamber designs is critical as it affects pathlength for each sub. you want the rear wave from each sub to combine in-phase (coherently) in the common port.
i see this neglected in some designs. i'm not sure that software even takes it into consideration.
thanks for the intelligent discussion. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif