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MarjanM 
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Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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 Posted: 11 May 2013 at 12:13am |
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Steve, i guess is the resin fumes from today's work so i dont express my self as clear as needed.
What i was asking is an overall response plot. With no LPF on the 12 and both normal and reverse polarity on the HF. On the overall response graph the polarity will have an effect.
Edited by MarjanM - 11 May 2013 at 12:14am |
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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bee
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Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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Posted: 11 May 2013 at 12:16am |
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plus 1 steve....
marganm plus 1/2 not sure how reversing the polarity for the reading will help.... ive never done this, please explain why this helps..... cheers....
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Steve_B
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Joined: 29 September 2007 Status: Offline Points: 1587 |
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Posted: 11 May 2013 at 12:43am |
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If you are measuring the combined response and flip the polarity of one of the drive units the combined outputs will cancel at the crossover point causing a dip in the response. Showing plots for both would show which way would be best. The actual graph would be no clearer to read.
The problem, based on the plots shown, is that the upper end of the mid response barely reaches the bottom end of the high response. Plus, given that the Op is using Smaart, it would be simpler just to show the phase plots. Here is an example of reversing the HF polarity. This is a passive EV box.  White and green plots are pole mounted and the brown is with the speaker on the floor in monitor mode.
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MarjanM
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Posted: 11 May 2013 at 12:44am |
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It wont help when reading the hf and lf separately, but it will help for the overall response. Depending on which crossover slopes he use it will make a difference. Per instance 24db LR slope usually shift the hf phase for 180 degrees. So the HF polarity has to be reversed.
Aslo i would recommend measuring the box at a bit bigger distance. 1m is too close for this type of boxes. Another thing, is the HF delayed to the 12 inch?
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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bee
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Posted: 19 May 2013 at 10:36pm |
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Great tip steve cheers, nether thought of doing it this way.....
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