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Old 19th February 2013, 10:09 PM   #11
Dissi is offline Dissi  Switzerland
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A crossover proposal using as many as possible of the existing crossover components. The design is optimized for a listening distance of 3 m and a vertical angle of 15 degrees. The simulation attached refers to that position also. The lower crossover frequency is about 430 Hz, couldn't go lower using the 4.7 mH woofer coil and the 47 uF midrange capacitor...

SimulationShmb.jpg

CrossoverShmb.jpg
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Old 19th February 2013, 10:11 PM   #12
shmb is offline shmb  Australia
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Originally Posted by 454Casull View Post
shmb,

Do you already own the drivers?
Yes I do, the system is already up and running, but with an unfinished, external crossover.
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Old 19th February 2013, 11:53 PM   #13
shmb is offline shmb  Australia
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Originally Posted by Dissi View Post
A crossover proposal using as many as possible of the existing crossover components. The design is optimized for a listening distance of 3 m and a vertical angle of 15 degrees. The simulation attached refers to that position also. The lower crossover frequency is about 430 Hz, couldn't go lower using the 4.7 mH woofer coil and the 47 uF midrange capacitor...

Attachment 331515

Attachment 331516

I can go larger in the inductor if I have to, I have a Jaycar 9mH (lower quality coil) to put in just for testing.
Same with Cap values. ( I have cheap bi-polar ones for testing)

How much horizontal spread would this design have?

Anyway, its something to try out and see, Thanks heaps for that, I'll give it a go.
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Old 20th February 2013, 06:17 PM   #14
system7 is offline system7  United Kingdom
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You give Dissi's design a go, my friend. Exactly as stated. He has rescued you.

You're not going to warm to me when I tell you your own efforts were laughably bad. But it's the truth.

It's a fairly standard idea to wire the two basses in series for a centre speaker, and it can be a bit woolly on the bass because the damping factor goes to hell, but frankly the SPL levels would never match any other way.
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Old 20th February 2013, 08:34 PM   #15
shmb is offline shmb  Australia
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Oh I knew it wasn't right, even though it sounded ok, but I tried various other combos too. Some were better than others in different ways. But no wow factor.

I've had success with standard 2 way designs in the past but this setup was something new to me.

Its hard when you do it by ear too, ......no measuring and no software.

What exactly was so bad? Freq response? Horizontal response? Phase response? Impedence? ......... Everything?
Did you plot a graph with my crossover? If so what did it look like? Dunno if I wan't to see it though.


BTW: I did Dissi's crossover last night and it is, as expected, much improved, especially in the lower crossover region. Maybe just a touch bright in the tweeter, but I can work on that.

Thank you very much.

Now to get this software program.
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Old 21st February 2013, 04:56 AM   #16
system7 is offline system7  United Kingdom
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I did model your rather vague crossover. It seemed to be essentially a two-way crossing over at about 3kHz with a midrange added to do something. Phase matching was non-existent too.

Click the image to open in full size.

What the heck is the shunt on the bass doing, for instance? Nothing!

It was obvious that the midrange was not efficient enough to work except with series woofers to keep the SPL down. Dissi's design seems to be doing about the right things although the treble filter is a bit odd.
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Old 23rd February 2013, 04:11 AM   #17
shmb is offline shmb  Australia
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Ok, fair enough. Yeah that shut wasn't doing much, I already knew that, it was removed soon after that picture was drawn.

Anyway Dissi's crossover is in use now, and is no doubt much much better.
I just had to pad the tweeter down a bit more, .....after a bit of playing and a few listening tests, all is now good.

Thanks again.
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Old 23rd February 2013, 02:57 PM   #18
Dissi is offline Dissi  Switzerland
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I'm glad to hear it's good now. Thanks for the feedback and friendly greetings to Down Under.
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Old 23rd February 2013, 06:29 PM   #19
sreten is offline sreten  United Kingdom
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Originally Posted by system7 View Post
.... and it can be a bit woolly on the bass
because the damping factor goes to hell, ....
Hi,

Care to elaborate on that misinformation ?

rgds, sreten.
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Old 23rd February 2013, 06:58 PM   #20
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Hi,

Care to elaborate on that misinformation ?

rgds, sreten.
Perhaps the man is used to tube amps?
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