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Old 13th December 2010, 08:04 AM   #1
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Default 2-Ways speakers for 22W per channel amplifier

Hello!

I wanted to ask an opinion. I'm doing a 22W per channel amplifier with stereo controls, which will be connected to a 2-way speakers per channel.

In the next picture is the circuit that connects the amplifier to the speakers.

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In the following, are the speakers I can get.

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I want to make a filter of 1st order with 6000Hz court frecuency , it gives me some results of C = 4.42uF and L = 0.21mH

What do you think? Would it work well? Should I add anything else? For example, Zobel network?

Thank you for your attention!
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Old 13th December 2010, 08:46 AM   #2
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When you are in possess of the woofers ,put them on running for at least 5 hours ,preferably in the box . Then you can give it a listen ,also unfiltered ,and you can judge its sonic behavior - specially in the mid-trebles ,and also in the lows ,if the box chosen is the final .
The frequency response in the curve given in the brief datasheet does not tell the sonics of that woofer : it may tell you that it might reach 3 or 4 KHz ...but it is better to cut at least an octave below . Also the speaker-in-a-box response will change dramatically and some changes will lead to change component values in the crossover (if not well calculated) .
Zobel networks ,that are used after the amplifier to prevent oscillations/dependence from cables ,can be used here to make the amplifier see a constant load trough the crossover , i.e. 'corrects' the impedance rise at a certain frequency ,the R determining the Q of the intervention ,associated also with the presumably high (for a coil at low frequencies )resistance of the inductor .
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Old 20th December 2010, 07:48 AM   #3
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Thank you very much for your reply! I going to do a sample circuit for to see if it works. After, i will write something here.

Regards!
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Old 21st December 2010, 10:51 AM   #4
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Hello again!
Excuse me for I do many questions.

I'm trying make a Zobel Network now. I need the value of the inductance of the speaker, but my multimeter does not measure Henries. I can know the value of the inductance of any other way?

Thank so much!
Regards!
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Old 21st December 2010, 11:15 AM   #5
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you (or measurement software ) can calculate Le from driver impedance.
Le is frequency-dependent!
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