Figure 2 needs a high pass filter on the high end and a low pass filter on the low end, otherwise is appropriate. I'd put the low pass after the LT to help kill any HF noise generated by the LT.
Thank you for the help, Ctrlx.
I will build the circuit and report you back about my experience.
Thank you so much Bob for this helpful and very clear guidance.
Here is another question:
I have built this active crossover circuit following this source :
Silicon Chip Online - Active 3-Way Crossover for Loud Speaker Systems
It has the following Specs:
"Linkwitz-Riley active filter stages"
Voltage Gain: Unity
Frequency response: Within ±1dB from 10Hz to 20kHz
Filter attenuation slope: 24dB/octave
Total harmonic distortion: Typically .003% at 1V RMS
Signal to noise ratio: -94dB unweighted (22Hz to 22kHz) with respect to 1V RMS
Separation between channels: Typically better than -100dB from 10Hz to 20kHz
Input impedance: 47kΩ
Output impedance: less than 200Ω
and this is being used in my current active amplifier setup comprising 6 X LM3886TF chips.
So, do I still need Linkwitz Transform circuit in my 3 way active amplifier setup? or will it be redundant in this case?
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That all depends on what you are trying to achieve. Remember that Linkwitz-Reilly filters are different than a Linkwitz transform. Both have their place.
If you are doing a standard 3 way and don't need to extend the woofer response, no. A two way plus sealed sub, maybe you want a Linkwitz Transform.
As with most things the Linkwitz Transform isn't a panacea. It can extend the response of a driver but only if the driver has the excursion and power handling to accept the transform and you have enough power.
So, I respond to your question with a question. What are your design goals and what drivers do you have in mind?
Just caught the 6 x LM3886TF. Unless you are looking for a low volume system, you won't have the power for a significant Linkwitz transform. If your transform has just 10 dB of gain, your top end will be limited to 6W to avoid clipping the bottom end.
If you are doing a standard 3 way and don't need to extend the woofer response, no. A two way plus sealed sub, maybe you want a Linkwitz Transform.
As with most things the Linkwitz Transform isn't a panacea. It can extend the response of a driver but only if the driver has the excursion and power handling to accept the transform and you have enough power.
So, I respond to your question with a question. What are your design goals and what drivers do you have in mind?
Just caught the 6 x LM3886TF. Unless you are looking for a low volume system, you won't have the power for a significant Linkwitz transform. If your transform has just 10 dB of gain, your top end will be limited to 6W to avoid clipping the bottom end.
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Hi,
3 way active crossovers are generally appalling at doing
what needs to be done for a HiFi quality 3 way speaker *.
Best limited to PA use, and home Hifi needs proper design.
The link is a fine example of utterly clueless techobabble.
Silicon Chip Online - Active 3-Way Crossover for Loud Speaker Systems
Next to nothing to do with really understanding speaker design.
Identical amplifiers are generally a poor choice in an active design.
rgds, sreten.
* Ones that simply have preset electrical x/o functions and level.
3 way active crossovers are generally appalling at doing
what needs to be done for a HiFi quality 3 way speaker *.
Best limited to PA use, and home Hifi needs proper design.
The link is a fine example of utterly clueless techobabble.
Silicon Chip Online - Active 3-Way Crossover for Loud Speaker Systems
Next to nothing to do with really understanding speaker design.
Identical amplifiers are generally a poor choice in an active design.
rgds, sreten.
* Ones that simply have preset electrical x/o functions and level.
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Agree, except I would extend that to cover any type of X-over not properly dimesioned for a given system, whether active or passive.
Also, and I really want to stress this point based on many years of experience working with the common "Linkwitz transform" circuit, it's definately not a panacea or miracle worker. I found that in general, F(3) of most designs can be lowered an octave at most if the drivers X-max and power limits aren't exceeded, and the amp being use can supply the power, but in the vast magority of cases, less than an extra octave can be obtained before difficulties set in.
Mike
Thank you Bob, your answer is very much appreciated! Very nice clarification.
Oh okay. I am planning to use a ported enclosure here as on Rod Elliot's site I read earlier that LT can be used in a ported enclosure too in some cases, if I am not mistaken.
Since I do not have access to world class driver yet, I want to experiment with my current DIY 3 way active system with what is available in my situation, for the time being, using a ported sub-enclosure in my man cave. I have already built the enclosures by obtaining TSP of the drivers and tuned with Eq-ing using pink noise and so far sounds pretty good. Still I want to know/learn from all of you on how to get more out of it, if possible.
Thank you again for this very informative and much needed reply. My system is a low volume one in a near field listening environment.
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Thank you sreten for your kind and wise reply as always.
I will give it a second thought.
Thank you Mike, for sharing your valuable experience which is surely a great privilege to me. Much appreciated, really.
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