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Multi-Way Conventional loudspeakers with crossovers

Introduction to designing crossovers without measurement
Introduction to designing crossovers without measurement
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Old Yesterday, 07:40 AM   #641
iperno is offline iperno  Italy
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The tweeter is 6 ohm, equal to the specifications given by seas, only the woofer is 4 ohm instead of 8 ohm as indicated by seas, probably these speakers were part of a series manufactured for a company, outside the catalog.
The thing that worries me most is the tweeter, in the aw7 project with the t18rex, the crossover has been designed for its tweeter that starts to sound more down than the t17rex tweeter I use, I would avoid the risk of damaging the tweeter, do I have to change something to make it sound from a higher frequency, or is it okay all that way?
Thank you.
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Old Yesterday, 10:50 AM   #642
AllenB is offline AllenB  Australia
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At low volumes this is OK. For example, you could even use an equaliser to increase the tweeter below its resonance, but with a 1" voice coil you can't do this at high volumes. A tweeter can sound different because of voice coil heating, it can change its volume compared to the woofer while you change the overall volume.

C1 mostly sets the crossover frequency so maybe you want to make this smaller. This does what you ask. (Do you want me to guess? maybe 4u7F)

L1 does the same for the woofer so you could make it smaller than 0m9H.

L2 and C3 will be wrong. Look at the impedance for the t17 and t18 tweeter. The peak is 1000Hz, 2000Hz. L2 and C3 maybe should be halved. Maybe try using an extra series resistor with them to reduce the effect and not cut too much lower treble.

R2 set more or less for the tweeter level.

C2, R1 try disconnecting this. If there is too much high treble, put them back.
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Old Yesterday, 11:53 AM   #643
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by AllenB View Post
C2, R1 try disconnecting this. If there is too much high treble, put them back.
Sorry, other way around.
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Old Yesterday, 12:22 PM   #644
iperno is offline iperno  Italy
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Unfortunately I have no measuring instruments to adjust, so I will have to use my ears.
Looking at the seas loki scheme, I see that they used a simple high pass with an l-pad, are there any problems with the phases if I use their high pass and keep the only impedance of 0.9 on the woofer?
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Old Yesterday, 12:31 PM   #645
iperno is offline iperno  Italy
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However, I welcome the proposal to bring C1 to 4.7 and take L2 to 0.28, as far as C3 is concerned if I remove it what happens?
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Old Yesterday, 10:31 PM   #646
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by iperno View Post
are there any problems with the phases if I use their high pass and keep the only impedance of 0.9 on the woofer?
The phase is connected with the response. The response is different for the T17. It is worth trying to get the response smooth for each driver, and then get them together.
Quote:
Originally Posted by iperno View Post
as far as C3 is concerned if I remove it what happens?
Then that part will become low impedance at lower frequencies. This means C1 and L2 can work as a second order filter.
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Old Today, 12:44 PM   #647
iperno is offline iperno  Italy
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There is one thing I don't understand: in the loki crossover they use a simple low pass for the woofer and a simple high pass for the tweeter, both second order, the cut is about 800hz for the woofer and about 4500hz for the tweeter, then attenuated with a resistive L-pad, simple, but my problem is that I have a different speaker, with a woofer that can somehow be compared and that perhaps sounds good even with less liters and in a closed box and goes up in frequency enough (on paper at least), but a tweeter that starts playing higher up and that has a resonance frequency that is 1khz above the other.
So if I adopted the high pass filter of the loki, with a cut at about 4500hz, I couldn't care less about the 2khz peak impedance, right?
It seems to me that the aw7 project filter is different in concept: it uses a first order on the woofer with the inductance and uses a sort of first order with C1 also on the tweeter, then adopting corrections with the L2C3 notch and with attenuation of C2R1 and R2, I don't really know which of the two I should prefer, if I had to leave the woofer filtered with only the impedance, then first order filter and use on the tweeter the second order high pass filter of the loki, would a crap come from?
Is it possible to predict the result with some kind of software?
Or do I follow the first route, that is port C1 at 4.7 and half L2 and C3 I hope everything goes well?
I don't have many components to do tests at home, if I have to adjust the values, I have to buy every time ....

Thanks again for your help, if you come to Italy, the pizza is offered by me
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