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<blockquote data-quote="squeak9798" data-source="post: 4402206" data-attributes="member: 555320">The axis refers to the aiming of the speakers in relation to the listening position.&nbsp; On axis is with the speakers aimed towards the listener, off axis is with the speakers aimed away from the listener.&nbsp; You&#039;ll also frequently see varying degrees of off axis aiming. Many frequency response graphs show 3 response measurements; 0* (On axis), 30* off axis, and 60* off axis.&nbsp; These of course describe how far off axis the speaker is aimed.Pros &amp;amp; Cons?&nbsp; The graph below is the frequency response of the Seas Excel tweeter.&nbsp; Notice what happens to the response as you move from on axis (0*) to off axis (30* &amp;amp; 60*).&nbsp; Mind you that graph goes out to 40khz....all we really care about is 20khz and below.&nbsp; So one of the &quot;cons&quot; for off axis is definitely the effect off-axis listening has on frequency response.&nbsp; In the higher frequencies, off axis response is almost always going to deteriorate for just about any driver.&nbsp; And depending on how poor the off axis response is, it could result in having a relatively narrow &quot;sweet spot&quot; with the drivers aimed on axis making proper aiming even more crucial.&nbsp; The &quot;pros&quot; (for car audio) to off axis aiming could include better performance due to the interaction of the driver with the listening space and utilizing the off axis response to help create even output levels at multiple listening positions from both tweeters.&nbsp; One of the problems with car audio is that it&#039;s difficult to aim both drivers on axis to multiple listeners.&nbsp; One way to attempt to help cure this is by aiming both drivers about equally off axis to each listening position.<img src="http:////gallery/1/4/7/3/6/response.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="squeak9798, post: 4402206, member: 555320"] The axis refers to the aiming of the speakers in relation to the listening position. On axis is with the speakers aimed towards the listener, off axis is with the speakers aimed away from the listener. You'll also frequently see varying degrees of off axis aiming. Many frequency response graphs show 3 response measurements; 0* (On axis), 30* off axis, and 60* off axis. These of course describe how far off axis the speaker is aimed. Pros & Cons? The graph below is the frequency response of the Seas Excel tweeter. Notice what happens to the response as you move from on axis (0*) to off axis (30* & 60*). Mind you that graph goes out to 40khz....all we really care about is 20khz and below. So one of the "cons" for off axis is definitely the effect off-axis listening has on frequency response. In the higher frequencies, off axis response is almost always going to deteriorate for just about any driver. And depending on how poor the off axis response is, it could result in having a relatively narrow "sweet spot" with the drivers aimed on axis making proper aiming even more crucial. The "pros" (for car audio) to off axis aiming could include better performance due to the interaction of the driver with the listening space and utilizing the off axis response to help create even output levels at multiple listening positions from [I]both[/I] tweeters. One of the problems with car audio is that it's difficult to aim both drivers on axis to multiple listeners. One way to attempt to help cure this is by aiming both drivers about equally off axis to each listening position. [IMG]http:////gallery/1/4/7/3/6/response.JPG[/IMG] [/QUOTE]

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