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Junior Varsity
Danley SH96HO
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<blockquote data-quote="Peter Morris" data-source="post: 141940" data-attributes="member: 652"><p>Re: Danley SH96HO</p><p></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The electrical response of a good crossover will flatten the amplitude response of the various drivers, time and phase align the relative pass bands while taking into account the impedance of the drivers, their individual phase response and their physical locations. So it will not match any text book electrical response.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span><span style="font-family: 'Times New Roman'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">Is probably best to ask; what is the acoustic crossover point? The answer to that is simple. It’s either:</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span><span style="color: #000000"><span style="font-family: 'Symbol'"><span style="font-size: 12px"></span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Symbol'"><span style="font-size: 12px">·</span> </span><span style="font-family: 'Calibri'"><span style="font-size: 12px">XXXHz</span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Calibri'"><span style="font-size: 12px"></span></span></span><span style="color: #000000"><span style="font-family: 'Symbol'"><span style="font-size: 12px">·</span> </span><span style="font-family: 'Calibri'"><span style="font-size: 12px">XXXHz asymmetric e.g. 24 dB LR + 18 dB Bessel </span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Calibri'"><span style="font-size: 12px"></span></span></span><span style="color: #000000"><span style="font-family: 'Symbol'"><span style="font-size: 12px">·</span> </span><span style="font-family: 'Calibri'"><span style="font-size: 12px">or they overlap with the 4” running up to about XXXXHz and the HF driver down to about XXXHz</span></span></span></p><p><span style="color: #000000"><span style="font-family: 'Calibri'"><span style="font-size: 12px"></span></span></span><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">To that you can add detail about the relative slopes, and if there is an overlap, how that is done. </span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">In the case of a synergy horn, the crossover points are related to the position of the entry points of the various drivers into the horn.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The maximum frequency (for example) of the 4 inch drivers has to be such that the dimension of the horn at the entry point have to be small in respect to the shortest wave length it produces … about 1/4 of a wavelength (rule of thumb) from the apex of the horn and each other. If you don’t do that you will get all sorts of reflections and ugly stuff happening inside the horn.</span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The other trick is that 15” drivers are in front of the 4”drivers which are in front of the HF driver. This means with some tricky passive crossover design you can reduce the total amount phase “displacement” (for want of a better description) needed to get it all to work. </span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000"></span></span></span><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">If for example, the 4 inch drivers entered the horn about 4 inch from the apex of the horn, ( FWIW I don't know where they do) the maximum <strong>desired</strong> crossover point would be <strong>about</strong> 800Hz, however you could more or less run the HF driver as low as you like.</span></span></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 141940, member: 652"] Re: Danley SH96HO [FONT=Calibri][SIZE=3][COLOR=#000000]The electrical response of a good crossover will flatten the amplitude response of the various drivers, time and phase align the relative pass bands while taking into account the impedance of the drivers, their individual phase response and their physical locations. So it will not match any text book electrical response. [/COLOR][/SIZE][/FONT][FONT=Times New Roman][SIZE=3][COLOR=#000000] [/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000]Is probably best to ask; what is the acoustic crossover point? The answer to that is simple. It’s either: [/COLOR][/SIZE][/FONT][COLOR=#000000][FONT=Symbol][SIZE=3] ·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]XXXHz [/SIZE][/FONT][/COLOR][COLOR=#000000][FONT=Symbol][SIZE=3]·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]XXXHz asymmetric e.g. 24 dB LR + 18 dB Bessel [/SIZE][/FONT][/COLOR][COLOR=#000000][FONT=Symbol][SIZE=3]·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]or they overlap with the 4” running up to about XXXXHz and the HF driver down to about XXXHz [/SIZE][/FONT][/COLOR][FONT=Calibri][SIZE=3][COLOR=#000000] To that you can add detail about the relative slopes, and if there is an overlap, how that is done. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]In the case of a synergy horn, the crossover points are related to the position of the entry points of the various drivers into the horn. [/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000]The maximum frequency (for example) of the 4 inch drivers has to be such that the dimension of the horn at the entry point have to be small in respect to the shortest wave length it produces … about 1/4 of a wavelength (rule of thumb) from the apex of the horn and each other. If you don’t do that you will get all sorts of reflections and ugly stuff happening inside the horn. [/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000]The other trick is that 15” drivers are in front of the 4”drivers which are in front of the HF driver. This means with some tricky passive crossover design you can reduce the total amount phase “displacement” (for want of a better description) needed to get it all to work. [/COLOR][/SIZE][/FONT][SIZE=3][COLOR=#000000][FONT=Calibri]If for example, the 4 inch drivers entered the horn about 4 inch from the apex of the horn, ( FWIW I don't know where they do) the maximum [B]desired[/B] crossover point would be [B]about[/B] 800Hz, however you could more or less run the HF driver as low as you like.[/FONT][/COLOR][/SIZE] [/QUOTE]
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