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Low Earth Orbit
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New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 138957" data-attributes="member: 652"><p>Re: New DIY Mid High</p><p></p><p></p><p></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The only issue with 18sound horn is the 60 degree pattern. If that’s what you want I suspect the 18sound version will work even better than the RCF. The 18sound horn will actually take up more the of box volume than the RCF Horn so as a rough GUESS the extra volume resulting from a slightly deeper box will be offset by the extra volume the horn takes. I had a play around with modelling different volumes when I made my prototypes and it’s not that critical.</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">I’m also planning to build 4 of the 60 degree version. Now my summer season is over I will have a lot more time.</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"> </span></span></span></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The one thing to stress is this box was designed with DSP correction as part of the original design.</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">Following on with Bennett suggestions trying to save us some money these are some of the options.</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="color: #000000"><span style="font-family: 'Symbol'"><span style="font-size: 12px">·</span> </span><span style="font-family: 'Calibri'"><span style="font-size: 12px">Use a passive crossover on the HF / VHF</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">Use the standard 4594 or even the 4593</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">Use the B&C 12NDL76 … this may actually give you more LF capability as B&C driver has a greater Xmax than the RCF. The RCF will probably have lower distortion and has more power handling.</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">Use a standard compression driver as Bennett suggested and cross it at 800Hz. Some compression drivers may be able to go down to 700Hz.</span></span></span></p><p></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The RCF Horn is available from Team Audio in France. </span></span></span><a href="http://www.teamaudio.fr/en/" target="_blank"><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #0000ff">http://www.teamaudio.fr/en/</span></span></span></a></p><p></p><p><span style="font-family: 'Calibri'"><span style="font-size: 12px"><span style="color: #000000">The horn is very important, it has to have a cut off frequency of 400Hz or less. The whole design concept revolves around getting the HF section to go lower than normal – 600 to 700Hz. By doing that, you can use a bent horn on the LF. If you can bend the LF horn the box can be smaller and the horn length can be increased to provide horn loading down to a lower frequency. To get just a bit more LF the box is ported.</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">The spacing for the two MF horns exists is also critical, the further they are apart the lower the crossover needed. The whole design is a balancing act between the box and horn physical dimensions and the crossover frequency.</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Because the dimensions of the LF horn are as small as can be, it causes some ripples in its frequency response, hence the need DSP correction. </span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 138957, member: 652"] Re: New DIY Mid High [FONT=Calibri][SIZE=3][COLOR=#000000]The only issue with 18sound horn is the 60 degree pattern. If that’s what you want I suspect the 18sound version will work even better than the RCF. The 18sound horn will actually take up more the of box volume than the RCF Horn so as a rough GUESS the extra volume resulting from a slightly deeper box will be offset by the extra volume the horn takes. I had a play around with modelling different volumes when I made my prototypes and it’s not that critical. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]I’m also planning to build 4 of the 60 degree version. Now my summer season is over I will have a lot more time. [/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000] The one thing to stress is this box was designed with DSP correction as part of the original design. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]Following on with Bennett suggestions trying to save us some money these are some of the options. [/COLOR][/SIZE][/FONT] [COLOR=#000000][FONT=Symbol][SIZE=3]·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]Use a passive crossover on the HF / VHF[/SIZE][/FONT][/COLOR] [COLOR=#000000][FONT=Symbol][SIZE=3]·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]Use the standard 4594 or even the 4593[/SIZE][/FONT][/COLOR] [COLOR=#000000][FONT=Symbol][SIZE=3]·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]Use the B&C 12NDL76 … this may actually give you more LF capability as B&C driver has a greater Xmax than the RCF. The RCF will probably have lower distortion and has more power handling.[/SIZE][/FONT][/COLOR] [COLOR=#000000][FONT=Symbol][SIZE=3]·[/SIZE] [/FONT][FONT=Calibri][SIZE=3]Use a standard compression driver as Bennett suggested and cross it at 800Hz. Some compression drivers may be able to go down to 700Hz.[/SIZE][/FONT][/COLOR] [FONT=Calibri][SIZE=3][COLOR=#000000]The RCF Horn is available from Team Audio in France. [/COLOR][/SIZE][/FONT][URL="http://www.teamaudio.fr/en/"][FONT=Calibri][SIZE=3][COLOR=#0000ff]http://www.teamaudio.fr/en/[/COLOR][/SIZE][/FONT][/URL] [FONT=Calibri][SIZE=3][COLOR=#000000]The horn is very important, it has to have a cut off frequency of 400Hz or less. The whole design concept revolves around getting the HF section to go lower than normal – 600 to 700Hz. By doing that, you can use a bent horn on the LF. If you can bend the LF horn the box can be smaller and the horn length can be increased to provide horn loading down to a lower frequency. To get just a bit more LF the box is ported. [/COLOR][/SIZE][/FONT] [FONT=Calibri][SIZE=3][COLOR=#000000]The spacing for the two MF horns exists is also critical, the further they are apart the lower the crossover needed. The whole design is a balancing act between the box and horn physical dimensions and the crossover frequency.[/COLOR][/SIZE][/FONT] [SIZE=3][COLOR=#000000][FONT=Calibri] Because the dimensions of the LF horn are as small as can be, it causes some ripples in its frequency response, hence the need DSP correction. [/FONT][/COLOR][/SIZE] [/QUOTE]
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