Home Theater Forum and Systems banner

1 - 3 of 3 Posts

·
Registered
Joined
·
61 Posts
Discussion Starter #1
can some one explain what low pass and high pass controls do i know they effect frequencies played in your speakers but in what way? thanks for your replies.
 

·
Registered
Joined
·
252 Posts
can some one explain what low pass and high pass controls do i know they effect frequencies played in your speakers but in what way? thanks for your replies.
A high-pass filter allows higher frequencies to pass while filtering/blocking the lower frequency range.

A low-pass filter allows lower frequencies to pass while filtering/blocking the higher frequency range.

With regards to subwoofers, a high-pass filter is often used on ported subwoofer designs to protect the driver from over-excursion at or below the tuning frequency of the box. They are also sometimes used on sealed subwoofer designs to prevent sending unnecessary power to the subwoofer for frequencies that cannot be reproduced. For example, a ported subwoofer tuned to 20 Hz may require a HPF near 16-17 Hz to prevent the driver from exceeding its maximum rated excursion. WinISD Pro can be used to see the effects of different HPF frequencies on a given design.

With regards to subwoofers, a low-pass filter is primarily used to prevent sending frequencies higher than the sub is designed to reproduce. Depending on the capabilities of your main speakers, this is typically in the 80 - 100 Hz frequency range. This function is most often provided today by A/V receivers. This setting is often called the crossover frequency and it specifies which frequencies should be sent out the main speaker terminals vs the LFE output terminal.
 
1 - 3 of 3 Posts
Top