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<blockquote data-quote="Silas Pradetto" data-source="post: 27357" data-attributes="member: 34">Re: Thoughts about amplifiers at 3/4 volume.Hey Jeff, unfortunately, the real-world acoustic response of the speakers being powered with the Driverack will look nothing like DBX&#039;s pretty picture. In fact, the picture doesn&#039;t even mirror the electrical response, and should not even be shown because it is misleading.Using amp gains or the bandpass gains on the DSP will yield the same net electrical response.You are right though, that relative bandpass gain will definitely change the acoustical crossover! This is why aux subs are a bad idea: they are variable. If one decides to adjust the aux for a channel to taste, they are effectively changing the acoustic crossover for that source, possibly causing all kinds of phase problems, depending on how compatible the sub and main phase responses are in their overlapping region. Personally, I prefer group subs, but those can have issues also.I&#039;ve actually seen people use the picture of the crossover in the Driverack to set up their system; it is surprising how much faith we put in pictures if they are available. I think the same thing happens with digital console EQ...Yes, you can put those pictures inline, you have to &#039;preview&#039; your post, then click the picture, get the link of the big one, then go back and insert a picture using the link that vBulletin provides....it&#039;s a huge pain.</blockquote>

[QUOTE="Silas Pradetto, post: 27357, member: 34"] Re: Thoughts about amplifiers at 3/4 volume. Hey Jeff, unfortunately, the real-world acoustic response of the speakers being powered with the Driverack will look nothing like DBX's pretty picture. In fact, the picture doesn't even mirror the electrical response, and should not even be shown because it is misleading. Using amp gains or the bandpass gains on the DSP will yield the same net electrical response. You are right though, that relative bandpass gain will definitely change the acoustical crossover! This is why aux subs are a bad idea: they are variable. If one decides to adjust the aux for a channel to taste, they are effectively changing the acoustic crossover for that source, possibly causing all kinds of phase problems, depending on how compatible the sub and main phase responses are in their overlapping region. Personally, I prefer group subs, but those can have issues also. I've actually seen people use the picture of the crossover in the Driverack to set up their system; it is surprising how much faith we put in pictures if they are available. I think the same thing happens with digital console EQ... Yes, you can put those pictures inline, you have to 'preview' your post, then click the picture, get the link of the big one, then go back and insert a picture using the link that vBulletin provides....it's a huge pain. [/QUOTE]

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