How to determine the Crossover Frequency - diyAudio
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Old 15th April 2017, 09:50 AM   #1
Desturo is offline Desturo  Germany
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Default How to determine the Crossover Frequency

Hello everyone,
I just planned my first speaker build. Its a stereo stetup with a woofer and a tweeter on each side. The drivers I want to use are:
Tweeter: ND16FA-6 6 Ohm 3.5kHz-27kHz
Woofer: RS75-4 4 Ohm 170Hz-20kHz
The amp I am planning to use is the LEPY LP-VS3 with 2x25W.
Now I need to calculate the values for the inductors and Capacitors. I tried to use the calculator on this site: https://www.diyaudioandvideo.com/Cal...akerCrossover/
but it asks for the Crossover Frequenzy. So How do I get the Crossover Frequenzy for my Speakers.

Thanks
Nico
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Old 15th April 2017, 10:31 AM   #2
Desturo is offline Desturo  Germany
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Just changed the Amp I want to use now I am considering the DTA-2
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Old 15th April 2017, 10:47 AM   #3
Scott L is online now Scott L  United States
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Hope this helps:


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Old 15th April 2017, 11:46 AM   #4
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Desturo View Post
Hello everyone,
I just planned my first speaker build. Its a stereo stetup with a woofer and a tweeter on each side. The drivers I want to use are:
Tweeter: ND16FA-6 6 Ohm 3.5kHz-27kHz
Woofer: RS75-4 4 Ohm 170Hz-20kHz
The amp I am planning to use is the LEPY LP-VS3 with 2x25W.
Now I need to calculate the values for the inductors and Capacitors. I tried to use the calculator on this site: https://www.diyaudioandvideo.com/Cal...akerCrossover/
but it asks for the Crossover Frequenzy. So How do I get the Crossover Frequenzy for my Speakers.

Thanks
Nico
Look at the frequency response of the two bare units.
Find a frequency range for each. See what the two units look like in the range that overlaps. Decide on a suitable crossover frequency that minimises the worst of the frequency response anomalies in that overlap range.

Now using that frequency, calculate the basic filter components for the low pass 4ohms bass/mid driver.
Using the same frequency, calculate the basic filter components for the high pass 6ohms treble driver.
Note you MUST use a mixture of 4ohms components in one filter and 6ohms components in the other filter.
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Old 15th April 2017, 11:59 AM   #5
Desturo is offline Desturo  Germany
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Quote:
Now using that frequency, calculate the basic filter components for the low pass 4ohms bass/mid driver.
Using the same frequency, calculate the basic filter components for the high pass 6ohms treble driver.
Where can I calculate those values? Can I use the calculator wich I linked in the original post? And if I can which order should I take.
And I sattled for a Crossover frequency of 8.5kHz will this work?
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Old 15th April 2017, 12:19 PM   #6
Flaesh is offline Flaesh  Russian Federation
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You can download FRD/ZMA Data Files for Daytons and use Xsim crossover design and simulation program..
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Old 15th April 2017, 12:23 PM   #7
AndrewT is offline AndrewT  Scotland
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I have never designed a passive crossover.
I guess any of those roll-off cirves would suit. I would try a 2pole L-R as a first stab at something.

Your 8k5Hz seems very high.
Can your Bass/Mid even reach 8k5Hz?
How well does it reproduce to an octave above your 8k5Hz?
Even a 2pole Butterworth will pass a large amount of energy to the bass/mid in the octave above the theoretical cross-over frequency.
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Old 15th April 2017, 12:49 PM   #8
Desturo is offline Desturo  Germany
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I downloaded Xsim but to use it I need the values for the inductors and capacitors wich I want to calculate.
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Old 15th April 2017, 12:53 PM   #9
Desturo is offline Desturo  Germany
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Quote:
Your 8k5Hz seems very high.
Can your Bass/Mid even reach 8k5Hz?
Yes it can. On the spec sheet it says it can reach to 20kHz.
And I dont really understand what you mean with reproducing an octave above 8.5kHz because I'm very new to this topic and don't know very much about it.
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Old 15th April 2017, 03:36 PM   #10
Desturo is offline Desturo  Germany
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Overthought my desicion and went with 3kHz Corssover Frequenzy
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