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Multi-Way Conventional loudspeakers with crossovers

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Old 25th July 2013, 05:27 PM   #111
jReave is offline jReave  Canada
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Originally Posted by merlin el mago View Post
Looks good but please note the correct dimensions, thanks.
Do I have something wrong?
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Old 25th July 2013, 06:27 PM   #112
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You not, possible me giving you bad data, the corrects one are like attached pic
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Old 25th July 2013, 06:57 PM   #113
tinitus is online now tinitus  Europe
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do you know your precise listening height measured where you plan to sit ?
and ofcourse in whatever position you normally take
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Old 25th July 2013, 08:23 PM   #114
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93 cm
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Old 25th July 2013, 09:03 PM   #115
jReave is offline jReave  Canada
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Great. Changes are noted and I should have something for you soon.
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Old 25th July 2013, 09:54 PM   #116
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Thanks
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Old 26th July 2013, 07:29 PM   #117
jReave is offline jReave  Canada
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Ok Felipe, here are some graphs for you.

Simulations are based on a 3m listening distance with the tweeter at about ear height. Dimensions and driver positioning are based on the last diagram you posted. For the woofer, I have only used about 3dB of baffle step compensation. In your room, it may need more or less. The mid is modeled in a sealed cab of 10L. The woofer in 75L tuned to 26Hz.

I used a reliable 3rd party (Zaph) for measurements of the tweeter and woofer, but had to rely on ScanSpeak's data for the mid. That's a good company though and my experience is that their's are better than others so I'm hoping it's accurate.

The xo to the woofer is at about 250Hz since distortion is best below 300Hz.

Graph 1 is your current speaker as is.

Graph 2 is with your current xo plus new xo's for the woofer. Not very pretty.

Graph 3 is my best attempt re-working all xo points. That's looking better but the top end still isn't very smooth due to the baffle diffraction of your top cabinet.

Graph 4 then is the top cabinet with chamfered edges like I mentioned before and then the xo optimized for that. Clearly that is the smoothest response. Minimum impedance gets down to about 3ohm just at 1 point around 5000Hz. If your amp can drive 4ohm speakers then that will be fine.

So time to make some choices. Let me know which version you want to go with - top cabinet as is or with chamfered edges. You could leave it as is and place felt on the front of the baffle to control the diffraction (like Wilson Audio does), but I have no way of modelling that result so no way of knowing what to do with the xo for that situation.

Cheers
Attached Images
File Type: gif PCD FR current 2-way.gif (37.7 KB, 70 views)
File Type: gif PCD FR 3-way no chfr current 2-way xo.gif (50.9 KB, 69 views)
File Type: gif PCD FR 3-way no chmfr modified xo.gif (50.9 KB, 68 views)
File Type: gif PCD FR 3-way w chmfr all new xo.gif (50.7 KB, 67 views)
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Old 26th July 2013, 09:29 PM   #118
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Chamfered edges 45? onlyt top & sides?

My mono amps can drive 4 ohms (Borbely Millenium 75W RMS Class A @ 8 ohms), current speakers Wilson Audio Cub 4 ohms.

Last edited by merlin el mago; 26th July 2013 at 09:49 PM.
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Old 27th July 2013, 01:42 AM   #119
jReave is offline jReave  Canada
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Quote:
Originally Posted by merlin el mago View Post
Chamfered edges 45? onlyt top & sides?
I am not 100% sure but yes, I think a 2cm 45 chamfer on just the top and sides will be ok. That should just be a very small difference.

Perhaps as a test to know if my sims are matching reality, you might try your current xo with the 2.2ohm or the 3.3ohm resistor removed. This will bring the tweeter level up to about the same level as the mid. If you think it sounds better then we're good. If you think it sounds too bright, then we probably have a problem somewhere. Graph shows my sims with your current xo with the 3.3ohm removed.
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File Type: gif PCD FR current 2-way - 3.3R.gif (34.4 KB, 28 views)
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Old 27th July 2013, 07:09 AM   #120
tinitus is online now tinitus  Europe
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hi, jReave
hope you don't mind me asking

have you built speakers this way ?
experience with how a simmed response curve will sound in real life ?


just very curious to know how well sim technology works
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