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Multi-Way Conventional loudspeakers with crossovers

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Old 23rd June 2012, 11:18 AM   #31
system7 is offline system7  United Kingdom
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I had a feeling Troels Gravesen had used this bass unit in one of his designs, which here uses a SEAS metal tweeter which is not to everyone's taste:

The SEAS 27 TFF is the simplest high end tweeter SEAS do. Like the TFFC but no back chamber, hence a couple of dB less sensitivity. Should be a doddle to slot into any of Troel's typical third order filters for the 27 TFFC with a resistance adjustment.

Third order filters usually have capacitors in the ratio of 1:3. Where they are heavily attenuated by a resistor at the input, the capacitor values become more similar and the inductor gets smaller.
Best Regards from Steve in Portsmouth, UK.
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Old 23rd June 2012, 11:34 AM   #32
Starre is offline Starre  Sweden
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I was planning to use a crossover frequency about 2500 Hz and thought that tweeter will do for that. If a lower crossover frequency is wanted, you probably are better using the more expensive version with back chamber. Do you think this is correct?
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Old 23rd June 2012, 03:36 PM   #33
Starre is offline Starre  Sweden
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Ok, I have now ordered Seas CA18RLY and 27TFF! Wish me luck!
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Old 23rd June 2012, 06:25 PM   #34
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Good luck!
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Old 23rd June 2012, 06:36 PM   #35
Starre is offline Starre  Sweden
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Hehe, thanks! I will start a new thread when I start to build.
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Old 23rd June 2012, 07:10 PM   #36
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Originally Posted by Starre View Post
Inductor: I used that calculator for CA18RLY and it said it was fine either way. Do you think the crossover for CA18RLY and 27TFF need to be complicated/expensive?
The CALCULATOR is maybe in the limit. I gave you this one but use others as well and test before a final decision. You can do an interchangeable small panel with the port (BR vs. sealed) and the speaker posts into the back panel.
The drivers look nice for a not very expensive crossover. But as all the initial designs, made by you, with the extra costs and time of testing, you will buy different parts/components to test different values and then calibrate. That's not cheap if you consider added shipping charges for duplicates (components of different values). But I will not considerer a big difference or expensive if you need, say as an example, a 3. order for the tweeter instead of a second order (one more cap). Only when you have complex drivers/crossovers out of the ordinary. Your drivers look great to start with. Are you going to measure them or using the frd/zma's for the crossover?

To look at, someone is using here an example of 2. order crossover with TFFC and Focal with that tweeter. H0831-06 27TFF
DIY Granite Speakers with Seas G17REX/P and 27 TFFC Drivers

Last edited by Inductor; 23rd June 2012 at 07:20 PM.
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Old 23rd June 2012, 07:38 PM   #37
Starre is offline Starre  Sweden
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I will probably start with listening to the raw drivers on a big open baffle and get a microphone measuring them. Later on trying with a test box sealed vs reflex. I have no more planning than that so far. Now I am just pleased I have selected drivers and beeing on my way with it.
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