Help for 3 or 4 way loudspeaker

[Lojzek]

How many uF the cap for the tweeter to do the sum measurement?
can be enough 24uF because I have one on hand?

Build the XO filter as jReave suggested. Look at the post 221.
After you wire the passive parts to your tweeter, record the FR
so we see how it performs.

 

[merlin el mago]

Can I use this 2 way xover?

 

[merlin el mago]

Attached measurements, 1st pic tweeter without xover, 2nd woofer without xover and 3rd sum twetter+woofer with xover.

 

[Lojzek]

Merlin,

use whatever filter you want. A normal procedure would be to
start installing parts one by one. First a resistor, then a resistor
with a say 8,2 uF cap, then a shunt coil 0,22 mH or any part value
you wish or have at hand. Record every FR for each change. Mic
should not be moved.

 

[merlin el mago]

Thanks Lojzek your help is really appreciated.

 

[merlin el mago]

Sorry my ignorance what do you mind these doted lines in the graphs?

 

[Lojzek]

Dotted is the phase response and the values are on
the right side of the graph.

 

[merlin el mago]

Thank you, what do you think of the xover?

 

[Lojzek]

XO filter in post 242 is unusual. I tend to use not to many parts.
What matters is how do all these parts work together and see
the difference with and without them. Try it.

 

[merlin el mago]

I tried and posted the measurements with the xover, any suggestion to improve it?

 

[Lojzek]

Wait a second. You posted measurements of the drivers with what
filter? The one in 242 ?

 

[merlin el mago]

Yes see post 243 3rd pic shows the sum tweeter+woofer with xover connected.

 

[Lojzek]

The first two graphs are without filters, right ? Do the measuring
with bass filter only and post it. The same with tweeter and its filter.
Make a picture that shows both of the slopes intersecting without their
sum. Extend the window for the bass to show 200 Hz and up. For the
tweeter it is enough from 1 kHz.

 

[merlin el mago]

Yes the two first graphs are without filters. I do the new measurements.

 

[merlin el mago]

Requested measurements. How can do to make a picture that shows both of the slopes intersecting without their sum?

 

[merlin el mago]

I guess I made a mistake, attached new graph for the woofer 200Hz & up

 

[Lojzek]

I guess there must be an option in Holmimpulse so you can
include both of the measurements in the same display.
In the meantime, cut the RLC filter out of the circuit
and record it. I will take a look at the pictures later.

 

[merlin el mago]

Do you want that I take a new measurement without the RLC used in the tweeter xover?

 

[Lojzek]

Yes, just cut one wire either on R or L or C. I just had a look
at the graphs and definitely this XO filter version is not high
quality solution. There is the 5 dB deep from 1k to 6 kHz.

 

[merlin el mago]

OK I will take new measurement without RLC.