design floorstanding 2way with Neo3 in dipole and Fr125 in TL - diyAudio
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Old 20th December 2008, 03:19 PM   #1
Henkjan is offline Henkjan  Netherlands
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Default design floorstanding 2way with Neo3 in dipole and Fr125 in TL

I present here Hans, a 2 way floorstanding speaker with a special design, inspired by artists as Mondriaan and Rietveld

As tweeter, I chose the B&G Neo3PDR in dipole, the midwoofer is the FR125 from CSS that sits in a TL, crossover is ~4kHz 3rd order
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Old 20th December 2008, 03:23 PM   #2
Henkjan is offline Henkjan  Netherlands
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for the TL I have made extensive use of MJK's allignment tables and his mathcad sheets to get a deep and flat response within the size of the cabinet and the position of the midwoofer at the top, and optimising the amount of stuffing. the bass output can be tuned by adjusting the stuffing in the bottom
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Old 20th December 2008, 03:26 PM   #3
Henkjan is offline Henkjan  Netherlands
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which gives this as a simulated frequency response (the black response is with the double amount of stuffing in the bottom)
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Old 20th December 2008, 03:29 PM   #4
Henkjan is offline Henkjan  Netherlands
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and here is the plan
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Old 20th December 2008, 03:37 PM   #5
Henkjan is offline Henkjan  Netherlands
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and here is the filter

it is a 3rd order for the tweeter, and 2nd order for the woofer. we tried a lower order filter, but found that there was too much overlap and the phase would not be paralel enough for this (effect: the individual curves were at some points above the summed response)

we also tried a lower X-over point, but a dip in the response of the Neo3 (some difraction, it would disappear for the larger part under 30) made us go higher, with the added bonus of making better use of the FR125's mids

the woofer's coil has a small cap to act as a notch filter for the small hump at 7kHz in the FR125's response
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Old 20th December 2008, 03:44 PM   #6
Henkjan is offline Henkjan  Netherlands
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which results in the following response... (the 60dB is not correct of course... red is response under 15)

and how is the sound? very good, as expected actually
a realy full and clean bass, nice mids, and a crisp and detailled high. listening slightly off axis results in an excelent imaging
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Old 20th December 2008, 03:45 PM   #7
Henkjan is offline Henkjan  Netherlands
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and for those who prefer a more classical design, Ewoud made this...
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Old 20th December 2008, 04:49 PM   #8
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Hi,

cool!

If I can, I suggest you to try( just for curiousity) a first acoustic order
at 5-6 Khz.
Mine Neo3pdr can handle 10 microF without any problem

Cheers,
Paolo
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Old 21st December 2008, 06:59 PM   #9
Henkjan is offline Henkjan  Netherlands
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well... hadn't I already completed tidying the filter, and mounting it "final" in the enclosure I could have tried...

I'm sure both the FR125 and the Neo3 can handle the lower order filter.. might need some notch filter here and there and maybe some impedance correction. but I'm a bit worried about the off-axis response of the FR125 when crossing that high, maybe difficult to match it then... maybe in d'A with 2 3" drivers
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Old 21st December 2008, 07:26 PM   #10
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off axis ? Sure it's not perfect but IMO is better than you can imagine by the crude data.
And first order make miracles ....
I cross my audax HM100Zo at about 5Khz and no one have guessed
it
I think you can make the same with your CSS ( after all it is similar to the Vandersteen approch, no? )

Cheers,
Paolo
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