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Multi-Way Conventional loudspeakers with crossovers

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Old 3rd January 2013, 10:32 AM   #11
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Very nice indeed.
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Old 3rd January 2013, 10:57 AM   #12
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Thanks guys!
I've done plenty of measurements during development, I think about 200.
First the filter was created in lspcad based on the measurements of the drivers in the cabinets, this was good to get a rough sketch of what the filter could be.
After that I designed and tuned the filter in a test setup: I had the filter wired outside so I could easily change the value of a capacitor, coil or resistor, measure it with my microphone, see the impact, listen to it, change another value and so on ... until it sounded and measured very good.

I'll post some measurements next weekend.
Here's the testsetup of the filter:
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Old 5th January 2013, 02:41 AM   #13
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Very nice!
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Old 6th January 2013, 11:19 PM   #14
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Default Little update filter

Hello,
I just did some extensive listening to all kind of music, sometimes it sounded perfect, sometimes not enough bass, sometimes not enough highs, sometimes to pronounced voices.
So I did a little update on the filter, I added some resistors to attenuate the mid and/or the highs so it's easy to adapt the speaker to the room or the music it's playing.
For the mid there's R23 of 1.8ohm that gives 1.5db attenuation of the mid.
For the tweeter there's R22 of 1.8ohm that gives 1.2db attenuation of the tweeter.
Both resistors can be bypassed if no attenuation is wanted.
For the tweeter I've also added bypass resistors, R24 adds 0.7db and R25 adds 1.4db higher output to the tweeter.
Now I can easily adjust the speaker to the room, the recording or my preference
The Accuton, Raal and Alcones are playing very nice together, it sounds as one coherent image.
Pleasantly surprised with the Alcones: the bass is very detailed, never been that easy to follow the bass lines and drums separate.
One problem with this speaker: you just can't sit still when listening to the music, it starts with one foot tapping, then another, then the rest of you
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Last edited by danny_66; 6th January 2013 at 11:33 PM.
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Old 6th January 2013, 11:25 PM   #15
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So where are the measurements?

On and off axis...
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Old 6th January 2013, 11:37 PM   #16
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The measurements will be for next week,
I've moved the speakers to another room and it's almost impossible to get some consistent measurements, too many reflections and room modes.
Next week I'll move them back to a larger room where I've been able to do some good measurements.
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Old 7th January 2013, 08:40 PM   #17
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I did a quick measurement in that small room (4mx4m)
The microphone is at 1m distance and 1m height (between mid and ribbon), 1/6th octave smoothing.
Don't pay attention to the dips below 200Hz, if I move the mic a little I get a different looking measurement.
Next week when the speakers are in the larger room I'll do some more measurements.
This speaker is voiced like my Focal 1027s and also like Troels does, you don't want the frequency response to be completely flat: it will give you a headache and run out of the room, especially with the Raal ribbon, it has a very wide dispersion.
During development of the crossover I also measured the Focal 1027s to compare.
I am quite satisfied with the result
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Old 7th January 2013, 08:49 PM   #18
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Not bad, I wouldn't mind seeing off axis too when you get around to it.

Enjoy!
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Old 7th January 2013, 08:55 PM   #19
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Very nice response curve and room acoustics
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Old 7th January 2013, 09:59 PM   #20
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Here's the response off axis at 30 degrees
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Last edited by danny_66; 7th January 2013 at 10:09 PM.
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