Hi Joe,
It depends on if it’s a real issue or not.
Baffle width, baffle radiating area and baffle layout all play a role in determining baffle compensation.
You can find some online baffle simulators which will assist in determining if baffle compensation is required.
Ian
Hi Ian. It is a real issue with many speakers to varying degrees. Its displayed in the acoustic in room measurements and confirmed by audibility, also by simulation. A crossover, active or passive will need control over Baffle diffraction loss.
6-24 crossover without BSC will not be enough with all speaker systems, bass level will be attenuated relative to mids/highs with many loudspeakers placed a distance from the wall??
6-24 crossover without BSC will not be enough with all speaker systems, bass level will be attenuated relative to mids/highs with many loudspeakers placed a distance from the wall??
Of course baffle step is real, what Ian is getting at is if you actually need it in every application, to which the answer is of course, no.
That said, remember that there is a kind of baffle step correction that can be applied merely by the volume pots on the crossover, you can make up some of the loss by having the crossover output higher in the bass section. Is this frequency dependent targeted to the specific BSC required in your application? No, but it will do more than you'd expect.
That said, remember that there is a kind of baffle step correction that can be applied merely by the volume pots on the crossover, you can make up some of the loss by having the crossover output higher in the bass section. Is this frequency dependent targeted to the specific BSC required in your application? No, but it will do more than you'd expect.
If you look at Douglas Self's Active Crossover Design book baffle step compensation schematic is illustrated.
A three or four way system with a 12 or 15 inch woofer at the bottom of the baffle does not require a baffle step compensation.
Typically a 2 way tall tower with a narrow baffle under 30cm with the 6.5 inch mid bass will require baffle step compensation. Some designers add a second or 3rd woofer to offset the effect with staggered 1st order low pass crossover points.
Hi,
I've just ordered two of the kits to make up a balanced version of the crossover. I've searched the thread and couldn't find the answer, but can some tell me what would be sensible lowest voltage that the crossover boards can run at?
Thanks 😉
I've just ordered two of the kits to make up a balanced version of the crossover. I've searched the thread and couldn't find the answer, but can some tell me what would be sensible lowest voltage that the crossover boards can run at?
Thanks 😉
Assuming you mean supply voltage, you can operate at 12 volts, but the distortion is higher and the maximum output is limited. If that's all you have, it will work...
Nelson,
Thanks for your response. Yes, I did mean supply voltage 😉
I have a good linear PSU that can output 19V so I'll give that a try . 👍
Thanks for your response. Yes, I did mean supply voltage 😉
I have a good linear PSU that can output 19V so I'll give that a try . 👍
Hi everyone. I have a few questions:
1) is there a procedure to generate the component values to achieve 3rd order Butterworth filters? (having the freedom to use non-textbook filters is really good, but I would like to replicate a digital filter that is using it and compare both)
2) What is the max input voltage from the preamp if one skips the pot at input?
3) if not using the input pot at all, could the buffer be skipped w/o penalty? I have a TVC at the output of my preamp, it's output impedance varies with attenuation, but should remain bellow 1Kohm.
4) is the output level voltage on the passband of each branch of the filters the same as the input voltage if the input pot is not used?
S.
1) is there a procedure to generate the component values to achieve 3rd order Butterworth filters? (having the freedom to use non-textbook filters is really good, but I would like to replicate a digital filter that is using it and compare both)
2) What is the max input voltage from the preamp if one skips the pot at input?
3) if not using the input pot at all, could the buffer be skipped w/o penalty? I have a TVC at the output of my preamp, it's output impedance varies with attenuation, but should remain bellow 1Kohm.
4) is the output level voltage on the passband of each branch of the filters the same as the input voltage if the input pot is not used?
S.
I'm usually happy with the results I get from this free online active filter generator web page. But maybe I haven't yet stumbled into areas where it is weak or inaccurate. Just plug in the damping ratio "zeta" which corresponds to a Butterworth filter, and Bob's your uncle.
They also offer the MFB topology if you seek a filter that's polarity inverting.
They also offer the MFB topology if you seek a filter that's polarity inverting.
Thank you Mark! Pardon me for my ignorance... I can get the values for second and third order Butterworth filters with the linked website, buy could you help me translate the case of the third order one to the cascaded configuration of the XO here?
I have some questions about this flexible crossover.
I would like to use this crossover for test purpose on 1 3-way speaker. (mono)
Am I right to say that 1 board is sufficient to build a mono 3-way filter?
For woofer I need a low pass and for tweeter a high pass filter. But how can I build the low-high pass for the mid driver?
How can I deal with baffle step, notch filters, attenuation of mid and tweeter, etc...?
I would like to use this crossover for test purpose on 1 3-way speaker. (mono)
Am I right to say that 1 board is sufficient to build a mono 3-way filter?
For woofer I need a low pass and for tweeter a high pass filter. But how can I build the low-high pass for the mid driver?
How can I deal with baffle step, notch filters, attenuation of mid and tweeter, etc...?
MrHifiTunes,
you have two high pass two low pass per board, each w/ independent level control.
Baffle step is not implemented as such, nor filters or other EQ.
you have two high pass two low pass per board, each w/ independent level control.
Baffle step is not implemented as such, nor filters or other EQ.
I was playing around with the simple crossover calculator last night from the article last night for the firet time. I got half way to build a crossover in microcap. Can anyone point me in the direction of a 24dB or 18dB crossover point at 200Hz?
