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Junior Varsity
When to replace drivers.
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<blockquote data-quote="Kip Conner" data-source="post: 24026" data-attributes="member: 445"><p>Re: When to replace drivers.</p><p></p><p>In regards to the phase shift in the upper end it could either way. I don't know anything about these particular drivers but I can tell you this:</p><p></p><p>1 In individual drivers phase is in the spot is not of great concern within it's respective cabinet / system since that area doesn't have a strong relationship with the driver that is producing the mid range frequencies. This would not be the case if the phase shift happened at the crossover point between the mid and hi drivers. Of course this statement would be false if you added some wonderful super tweeters from the last decade. </p><p></p><p>2. Where it is important is that all of the drivers you are using have the same phase response. For instance if the two systems on your plot were a part of an active left vs. right or even placed side by side as a pair than you run the risk of cancellations. at certain frequencies. </p><p></p><p>Since neither of your phase traces are showing any one frequency a full 180 out than your PA might classified as "Phasey" but not a life threatening deal. It sounds like you replaced all of the drivers so hopefully they all have same response. </p><p></p><p>In a similar situation I just replaced once HF driver in a UPA because it was exhibiting symptoms of amplitude loss. It scared me to death that I was going to get a new driver from Meyer with a different freq or phase response. The new driver had a slightly different freq response, but the phase response was almost dead on. We know that changing the EQ of a driver changes it's phase response so I was fortunate that the differences were just subtle.</p><p></p><p>Here's a screenshot of the same UPA before and after EQ- see the phase shift on the top end and the actual reading of data on the low end where I added the 80-100Hz.</p><p></p><p>Now, how do you make screenshots full size. I clicked on it and choose full size but it didn't take?</p></blockquote><p></p>
[QUOTE="Kip Conner, post: 24026, member: 445"] Re: When to replace drivers. In regards to the phase shift in the upper end it could either way. I don't know anything about these particular drivers but I can tell you this: 1 In individual drivers phase is in the spot is not of great concern within it's respective cabinet / system since that area doesn't have a strong relationship with the driver that is producing the mid range frequencies. This would not be the case if the phase shift happened at the crossover point between the mid and hi drivers. Of course this statement would be false if you added some wonderful super tweeters from the last decade. 2. Where it is important is that all of the drivers you are using have the same phase response. For instance if the two systems on your plot were a part of an active left vs. right or even placed side by side as a pair than you run the risk of cancellations. at certain frequencies. Since neither of your phase traces are showing any one frequency a full 180 out than your PA might classified as "Phasey" but not a life threatening deal. It sounds like you replaced all of the drivers so hopefully they all have same response. In a similar situation I just replaced once HF driver in a UPA because it was exhibiting symptoms of amplitude loss. It scared me to death that I was going to get a new driver from Meyer with a different freq or phase response. The new driver had a slightly different freq response, but the phase response was almost dead on. We know that changing the EQ of a driver changes it's phase response so I was fortunate that the differences were just subtle. Here's a screenshot of the same UPA before and after EQ- see the phase shift on the top end and the actual reading of data on the low end where I added the 80-100Hz. Now, how do you make screenshots full size. I clicked on it and choose full size but it didn't take? [/QUOTE]
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