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Multi-Way Conventional loudspeakers with crossovers

Crossover questions
Crossover questions
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Old 13th April 2010, 08:28 PM   #1
mrkaza is offline mrkaza  Greece
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Default Crossover questions

Hi , my name is Panagiotis and I would like to ask some questions


I have 2 pairs of Focal 165 V but I forgot the crossovers on my old car and I cannot find them now , so I decide to make a crossover to use them to my new one




I want to ask the following questions


1) when I connect the Tweeter and the crossover the impedance change as it will with 2 same loudspeakers or not ?


2) If I do not cross the woofer will I destroy it or just his sound ?




3) The coil wire diameter have to do with the watt of the loundspeaker or is just the wider the better ?




4) I use some of the calculators and decide to use the folowing componets


10 uf CLARITYCAP - Polypropylene SA type first I thing to choose 12 uf but this going at 3300 hz when focal cross it to 3500 and I am afraid that this + that now I am cuting off with 6 db/ octave and not 12 I will burn them so I decide to go safe cross them about at 4000 hz


An MUNDORF TYPE - BA140 - M-Coil rod-core coils, wire 1.40mm (baked varnished)


at 0,15 Mh


will they do the job ?


Also I read about the zobel filter but I do not understood if I need one for woofer and one for the tweeter and how I connect them .


Thanks in advance and sorry of asking to much on a since post
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Old 13th April 2010, 08:50 PM   #2
Jonathan Bright is offline Jonathan Bright  Australia
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The main thing to do is protect the tweeter. I would try and make sure that the cross-over was 12db per octave and NOT just 6. You should try and have a coil across the tweeter to make it a 12 db per octave slope.

If you put an inductor (coil) in the woofer (bass) speaker the impedence will remain the same. The speakers are probably both 4 ohm.

If you do not cross over the bass speaker you wont destroy the speaker but the sound won't be as good. But the impedence of the system may get too low and that could cause problems for the amplifier...

The Zobel network is not very important.

Good luck,,,,,Jonathan
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Old 13th April 2010, 09:16 PM   #3
mrkaza is offline mrkaza  Greece
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i just found more data

http://www.focal-fr.com/catalogue-do...files/1245.pdf

http://www.focal-fr.com/catalogue-do...files/1302.pdf

not sure about the tweeter since mine has another color maybe cause it is 5 years old maybe they change it
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Old 13th April 2010, 09:17 PM   #4
mrkaza is offline mrkaza  Greece
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Since i have an 4 ohm woofer and an 8 ohm tweeter i must calculate again .... also how i can have a 4 ohm set like i use to ?
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Old 14th April 2010, 12:14 AM   #5
Inductor is offline Inductor  Portugal
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Or this Aluminum/Magnesium TNA tweeters

FA165V1 crossover for 165V1 (each) $35 (austr.)
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File Type: jpg 165V1l-01-01.jpg (92.0 KB, 173 views)
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Last edited by Inductor; 14th April 2010 at 12:39 AM.
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Old 14th April 2010, 02:10 AM   #6
PeteMcK is offline PeteMcK
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re:'Since i have an 4 ohm woofer and an 8 ohm tweeter i must calculate again ' -
don't use 4 ohms & 8 ohms, you need to read the ACTUAL impedance at the crossover frequency off the graphs on the data sheets linked above.
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 14th April 2010, 07:03 AM   #7
mrkaza is offline mrkaza  Greece
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here at Greece they ask me about 300 for 4 crossovers also check the tweeters and is tn45 not tba
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Old 14th April 2010, 07:36 AM   #8
mrkaza is offline mrkaza  Greece
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try to edit but could not. sorry for double post

peterMck can you explain me that i am novice to that stuff .

Instructor can you pm me a link where you find them 35 $
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Old 14th April 2010, 10:10 AM   #9
Inductor is offline Inductor  Portugal
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I understand you checked is the TN45 tweeter. Some 165 Kits also had the Focal TN47 tweeter. They seem (TN45) to be x-ing at ~4K anyway.
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Old 14th April 2010, 11:33 AM   #10
mrkaza is offline mrkaza  Greece
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Is it possible to write tn45 on it and be a tn 47 ?

So on my question

how i cross it ? and how i make it 4 ohm since my tweter is 8 ohm ? i thing zobel is the solution but how i make it etc etc

do a good parts 6 db/oct + zobel going to be better than an 12 db/oct with cheaper componets ? even more do a good 6 db/oct will sound better than the one that the speakers come with ?


Thanks
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