Question for Thomas :)
Posted: Tue Jul 22, 2003 10:23 am
Mate - as I remember it to test a speaker's frequency response the old way was to bury the speaker in the ground in an open paddock with the front face of the speaker flush with the ground (hence the term flush mount) - a mic was then hung over the speaker and the response measured. The idea being that the ground absorbs any sound generated in the opposite direction of the front face of the speaker and the open air returns no other reflections.
Nowadays thay use an anechoic chamber.(for those who don't know this term and anechoic chamber is a room with extensive absorption wedges that absorb ALL the sound - i.e. a reverb time of Zero and no reflections) see attached photo.
They now place the speaker in the chamber and put a mic in front and measure the response.
Surely therefore the chamber is acting like the flush mount in that none of the rear projected sound is reflected back (i.e. like the ground) and the plane in front of the speaker also acts like the open air with no additional reflections.
Thus am I wrong in concluding that the printed frequency response of a speaker system as presented by a manufacturer, measured in a chamber, is in fact the response of the speaker in a soffit mount??
cheers
john
Nowadays thay use an anechoic chamber.(for those who don't know this term and anechoic chamber is a room with extensive absorption wedges that absorb ALL the sound - i.e. a reverb time of Zero and no reflections) see attached photo.
They now place the speaker in the chamber and put a mic in front and measure the response.
Surely therefore the chamber is acting like the flush mount in that none of the rear projected sound is reflected back (i.e. like the ground) and the plane in front of the speaker also acts like the open air with no additional reflections.
Thus am I wrong in concluding that the printed frequency response of a speaker system as presented by a manufacturer, measured in a chamber, is in fact the response of the speaker in a soffit mount??
cheers
john