DanielT
Major Contributor
Scenario, three-wave loudspeaker where each driver is powered by its own amplifier. Bass driver should work up to 250-300 Hz. Midrange should work up to around 2500 Hz. Why not plug in some resistors and capacitors? Advantages disadvantages? Note that three different separate amplifiers that power the bass, midrange and tweeter respectively.
Here's a calculation program, I entered some different frequencies and this came up. Now I sat Attenuation Level Desired to 30 dB but I can increase it. Advantages and disadvantages of having, for example, 60 dB vs 30 dB?
This is how the notch filter is constructed:
250 Hz cut of:
2500 Hz cut of:
* Does this type of notch filter affect the amplifiers ability to drive the speaker elements BELOW the set cutoff level,
notch filter frequency?
*A few resistors and capacitors can hardly cause any audible distortion to be introduced into the sound chain/solution, can they?
* Does the notch filter in any way affect the FR below the set cutoff level?
From the link above about the filter I now used:
This wideband notch filter calculator calculates the values of the resistors and capacitors based on the notch frequency range entered and the amount of attenuation that is desired at the output.
Unlike the twin-T notch filter, this wideband notch filter can have a much larger range for the bandstop.
To use this calculator, a user enters the lower frequency and the upper frequency. The lower frequency is where the user wants the bandstop to start and the upper frequency is where the user wants the bandstop to end. So, for example, if you want the bandstop to be active from 1KHz to 10KHz, 1KHz is the lower frequency and 10KHz is the upper frequency.
The next important part of this calculator is that you specify the amount of attenuation that is desired at the start and stop points of the bandpass filter. The different attenuation values are -15dB, -20dB, -30dB, -40dB, -50dB, and -60dB.
Here's a calculation program, I entered some different frequencies and this came up. Now I sat Attenuation Level Desired to 30 dB but I can increase it. Advantages and disadvantages of having, for example, 60 dB vs 30 dB?
This is how the notch filter is constructed:
250 Hz cut of:
2500 Hz cut of:
* Does this type of notch filter affect the amplifiers ability to drive the speaker elements BELOW the set cutoff level,
notch filter frequency?
*A few resistors and capacitors can hardly cause any audible distortion to be introduced into the sound chain/solution, can they?
* Does the notch filter in any way affect the FR below the set cutoff level?
Notch Filter Calculator
This notch filter calculates computes the values of the resistors and capacitors for the notch filter based on the input frequencies to be entered.
www.learningaboutelectronics.com
From the link above about the filter I now used:
This wideband notch filter calculator calculates the values of the resistors and capacitors based on the notch frequency range entered and the amount of attenuation that is desired at the output.
Unlike the twin-T notch filter, this wideband notch filter can have a much larger range for the bandstop.
To use this calculator, a user enters the lower frequency and the upper frequency. The lower frequency is where the user wants the bandstop to start and the upper frequency is where the user wants the bandstop to end. So, for example, if you want the bandstop to be active from 1KHz to 10KHz, 1KHz is the lower frequency and 10KHz is the upper frequency.
The next important part of this calculator is that you specify the amount of attenuation that is desired at the start and stop points of the bandpass filter. The different attenuation values are -15dB, -20dB, -30dB, -40dB, -50dB, and -60dB.