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<blockquote data-quote="msimon" data-source="post: 4483742" data-attributes="member: 561190">Unfortunately I just sent my 780 in for repair so I am just going off of memory and the manual on this one.I think I will start by briefly summarizing the crossover capabilities of this unit.The 780 offers high pass filters for both the front and rear speaker outputs. A high pass filter does exactly what it sounds like, it allows higher frequency to &quot;pass&quot; and decreases the output level of lower frequencies. However, this filter is not an instaneous filter, but rather there is some &quot;rolloff&quot; or &quot;slope&quot; that determines the output level at each frequency below the &quot;crossover point&quot;. The crossover point is the point at which the output of the filter is 3 decibels lower than full output. The 780 has HPF slopes of -12 db/oct, -6 db/oct, and 0 db/oct (pass), the larger the slope, the steeper the rolloff. Basically, the high pass filter protects your smaller speakers from bottoming out by not sending lower frequencies that cause over excursion.The 780 also offers a low pass fitler for the subwoofer output. Again, a low pass filter does exactly what it sounds like, it allows lower frequencies to pass and decreases the output level of higher frequencies. Again this filter is not an instanteous filter and the output of the signal is determined by the crossover slope and point. The 780 has LPF slopes of -18 db/oct, -12 db/oct, and -6 db/oct. Basically the high pass filter allows your subwoofer to play the lower frequencies it was designed to play, without distorting on higher frequencies.To specifically change the HPF settings go into the &quot;audio&quot; menu. Go to the &quot;Font HPF&quot; screen for your front speakers or the &quot;Rear HPF&quot; screen for your rear speakers. Push the multi-control left or right to adjust the HPF slope. To adjust the crossover point and over all output level, turn the multi-control to &quot;HPF FREQ&quot; screen. Select the frequency my pushing the multi-control left or right. Select the overall output level of the speaker output by pushing the multi-control up or down.If you are still a bit unsure of the 780&#039;s capabilities, I suggest that you read through the &quot;audio adjustment&quot; portion of the manual.Also if you want to learn more about crossovers in general go to <a href="http://www.bcae1.com" target="_blank">http://www.bcae1.com</a> and read the pages regarding crossovers.I hope this helps.</blockquote>

[QUOTE="msimon, post: 4483742, member: 561190"] Unfortunately I just sent my 780 in for repair so I am just going off of memory and the manual on this one. I think I will start by briefly summarizing the crossover capabilities of this unit. The 780 offers high pass filters for both the front and rear speaker outputs. A high pass filter does exactly what it sounds like, it allows higher frequency to "pass" and decreases the output level of lower frequencies. However, this filter is not an instaneous filter, but rather there is some "rolloff" or "slope" that determines the output level at each frequency below the "crossover point". The crossover point is the point at which the output of the filter is 3 decibels lower than full output. The 780 has HPF slopes of -12 db/oct, -6 db/oct, and 0 db/oct (pass), the larger the slope, the steeper the rolloff. Basically, the high pass filter protects your smaller speakers from bottoming out by not sending lower frequencies that cause over excursion. The 780 also offers a low pass fitler for the subwoofer output. Again, a low pass filter does exactly what it sounds like, it allows lower frequencies to pass and decreases the output level of higher frequencies. Again this filter is not an instanteous filter and the output of the signal is determined by the crossover slope and point. The 780 has LPF slopes of -18 db/oct, -12 db/oct, and -6 db/oct. Basically the high pass filter allows your subwoofer to play the lower frequencies it was designed to play, without distorting on higher frequencies. To specifically change the HPF settings go into the "audio" menu. Go to the "Font HPF" screen for your front speakers or the "Rear HPF" screen for your rear speakers. Push the multi-control left or right to adjust the HPF slope. To adjust the crossover point and over all output level, turn the multi-control to "HPF FREQ" screen. Select the frequency my pushing the multi-control left or right. Select the overall output level of the speaker output by pushing the multi-control up or down. If you are still a bit unsure of the 780's capabilities, I suggest that you read through the "audio adjustment" portion of the manual. Also if you want to learn more about crossovers in general go to [URL="http://www.bcae1.com"]http://www.bcae1.com[/URL] and read the pages regarding crossovers. I hope this helps. [/QUOTE]

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