|
High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
|
|
|
High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
|
In Reply to: P.T. Barnum & Bozo the happy little speaker clown posted by tomservo on September 14, 2003 at 18:46:43:
When disparate results are obtained using different measurement systems, one must consider the possibility of ambiguity. But there is no ambiguity in the correlation between phase and the ratios of real and imaginery impedance. You can easily find phase when resistance and reactance are known.The relationship between phase and impedance is determined by the following formula:
θ = ArcTan i / r
where,θ is the phase angle
i is the imaginary or reactive impedance, and
r is the real or resistive impedanceConsidering this, you can easily find the phase where impedance is known.
So let's look again at the response chart for a horn:
You can see that the horn is intended to be used from 40Hz to 400Hz, so that's the region of interest. You'll notice that the device is quite reactive, meaning that it has non-zero phase. And it isn't trivial - It is a significant amount. For example, phase θ = 65 o at 55Hz, 45 o at 110Hz, 30 o at 200Hz and 20 o at 400Hz, where the horn has reached upper cutoff. Phase isn't consistent either, but instead is a series of ripples representing large closely-spaced changes in phase.
Wayne
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Horn phase - Wayne Parham 09/14/0322:29:09 09/14/03 (2)
- Re: Horn phase - tomservo 18:12:07 09/16/03 (1)
- Re: Horn phase - Wayne Parham 01:12:04 09/17/03 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
