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Low Earth Orbit
DIY Audio
60 Degree DIY Mid Hi - AKA PM60
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<blockquote data-quote="Peter Morris" data-source="post: 146617" data-attributes="member: 652"><p>Re: 60 Degree DIY Mid Hi</p><p></p><p></p><p></p><p>Hi Don,</p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">The "heat plot" is showing you the amplitude & time response against frequency. </span></span></p><p> <span style="font-size: 12px"><span style="font-size: 10px"></span><span style="font-size: 10px">You can see the time delay caused by the 100Hz IIR high pass filter as the response trace swings to the left around 100Hz.</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">You can also see other time problems and resonances. In this case because all the drivers are operating linearly and in their piston range, nearly all the time issues can be corrected with EQ provided it’s in the correct place. If things are linear, the amplitude, phase and time domain response are all mathematically related. This is not the case when things are non - linear. </span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">The picture I posted compares your results with mine, and the perfect response on the far right. Note that the perfect response does not include a 100Hz hi pass filter. </span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">Looking at your results this would be my best (first) guess. You also have to consider that you will get different results depending on where you measure – i.e. on axis and off axis. </span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">+2 dB @ 12K – 14K BW 0.33</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">+ 1 dB @ 4K9 BW 0.33</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">-1.5 dB @ 3K9 BW 0.4</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">+ 1 dB @ 990 Hz BW 0.5</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">- 2 dB @ 600 Hz – 650 Hz BW 0.33 – This is around the crossover so there are three options, input EQ, Mid band EQ and Low band EQ. – My best guess is try it in the Low band EQ. You may need to increase the depth of some of the cuts or reduce some of the out of band boosts. </span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">- 1 dB @ 380 Hz BW 0.5</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">It also needs a bit more of a boost around 80 Hz, it is rolling off too fast with 100Hz crossover.</span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px"></span></span></p><p><span style="font-size: 12px"><span style="font-size: 10px">There is also an issue around 190 Hz – may need a little dip around there as well.</span></span></p><p><span style="font-size: 12px"></span></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 146617, member: 652"] Re: 60 Degree DIY Mid Hi Hi Don, [SIZE=3] [SIZE=2]The "heat plot" is showing you the amplitude & time response against frequency. [/SIZE][SIZE=2]You can see the time delay caused by the 100Hz IIR high pass filter as the response trace swings to the left around 100Hz.[/SIZE] [SIZE=2][/SIZE][SIZE=2] You can also see other time problems and resonances. In this case because all the drivers are operating linearly and in their piston range, nearly all the time issues can be corrected with EQ provided it’s in the correct place. If things are linear, the amplitude, phase and time domain response are all mathematically related. This is not the case when things are non - linear. [/SIZE] [SIZE=2][/SIZE][SIZE=2] The picture I posted compares your results with mine, and the perfect response on the far right. Note that the perfect response does not include a 100Hz hi pass filter. [/SIZE] [SIZE=2][/SIZE][SIZE=2] Looking at your results this would be my best (first) guess. You also have to consider that you will get different results depending on where you measure – i.e. on axis and off axis. [/SIZE] [SIZE=2][/SIZE][SIZE=2] +2 dB @ 12K – 14K BW 0.33[/SIZE] [SIZE=2][/SIZE][SIZE=2] + 1 dB @ 4K9 BW 0.33[/SIZE] [SIZE=2][/SIZE][SIZE=2] -1.5 dB @ 3K9 BW 0.4[/SIZE] [SIZE=2][/SIZE][SIZE=2] + 1 dB @ 990 Hz BW 0.5[/SIZE] [SIZE=2][/SIZE][SIZE=2] - 2 dB @ 600 Hz – 650 Hz BW 0.33 – This is around the crossover so there are three options, input EQ, Mid band EQ and Low band EQ. – My best guess is try it in the Low band EQ. You may need to increase the depth of some of the cuts or reduce some of the out of band boosts. [/SIZE] [SIZE=2][/SIZE][SIZE=2] - 1 dB @ 380 Hz BW 0.5[/SIZE] [SIZE=2][/SIZE][SIZE=2] It also needs a bit more of a boost around 80 Hz, it is rolling off too fast with 100Hz crossover.[/SIZE] [SIZE=2][/SIZE][SIZE=2] There is also an issue around 190 Hz – may need a little dip around there as well.[/SIZE] [/SIZE] [/QUOTE]
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