2 way passive crossover

[augustin87r]

Hello,

I would like to build a 2 way passive crossover for a pair of 2 loudspeakers system made in USSR (TENTO) a few years ago. I don't have the original speakers, nor the crossover inside so i decided to build one. The speaker cabinet is very nice and i think it was well calculated.

I have two 4 ohm speakers inside:

YDD 200 LPP
DIAM=200mm D. Magnet=100mm Putere M=150W
Frequency=55HZ-5KHZ
Senz=90dB Imped=4ohm;
output 75W

and this one:

Untitled


As you have noticed, i don't have a tweeter but a midrange speaker. I really do not want to use a tweeter because i don't like high pitched sounds. Anyhow, this speaker will reproduce quite well higher sounds....

I'm wondering what filters should i use? 2nd order or 3rd order? I have read that there is not much difference between 2nd order and 3rd order. The big difference is between 1st order and 2nd order.

However, i read about 2nd order here :
Second Order Passive Crossovers, 12 dB per Octave


and about 3rd order here:


Third Order Passive Crossovers, 18 dB per Octave



Building the inductors is very easy, i just have to specify the inductance

Shavano Music Online - Cross-Over Network; Air Core Inductor Calculator

Calculating the right inductance is difficult for me. This calculator makes things very easy, all i have to do is specify the speakers impedance and the frequency.

Passive Crossovers, Capacitor and Coil Calculator


The problem is i don't know what to introduce in the frequency field. I would like to get the best from these speakers. A three way crossover would have been easier. I think the 2 way is difficult because it's a compromise. It uses 2 speakers for the whole range instead of 3 separate speakers like in a 3 way system.

Any suggestion is welcome...

 

[carbonzit]

Well, as a starting point, you want the crossover point to be below the top of the woofer's (low-frequency driver) response, 5KHz. Well below, I'd say.

Is that the CL4-03 speaker you're looking at? I wouldn't believe their claimed specs for a minute. 18kHz? Give me a break!

Even if you don't, as you say, "like high pitched sounds" (certainly one of the strangest things I've read lately, but whatever), you might want to think about getting a proper high-frequency driver (aka tweeter), instead of what looks like a cheapo auto speaker. They're not that expensive, and if you're going to go to all this trouble to design and build a crossover, why waste it on crappy speakers?

 

[chiba]

The CL4-03's are meant to be full range drivers, probably don't need to run a crossover on them. Just calculate the coil to run in series with the woofer, say 4ohm, 3000hz 6db = 0.21221 Millihenries. Then make a coil Shavano Music Online - Cross-Over Network; Air Core Inductor Calculator

 

[augustin87r]

Thank you for your suggestions.

Indeed, it's strange i don't like high pitched sounds, i like more the midrange..

Just calculate the coil to run in series with the woofer, say 4ohm, 3000hz That's a good starting point. I thought about that or even lower, 2000hz...

For the `tweeter` i might use 7000 hz as value for the `frequency`field.... I think these values will give me a good balance...

What order do you think is better? 2nd or 3rd?

 

[crutschow]

Why not just buy an assembled crossover such as from here? It's a lot easier than trying to build your own.