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Multi-Way Conventional loudspeakers with crossovers

SNR-1 : Mundorf / Scanspeak 2 Way
SNR-1 : Mundorf / Scanspeak 2 Way
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Old 25th December 2017, 07:43 AM   #11
Bill poster is offline Bill poster  Thailand
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It does look easy to use.

Here's the Troels link. It doesnt put me off using it but obviously trying to soak up as much info (bf I start)is a good idea

SP95
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Old 25th December 2017, 08:17 AM   #12
Mario Pankov is offline Mario Pankov  Europe
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SNR-1 : Mundorf / Scanspeak 2 Way
I`m not sure why he`d have given up, the 18W is among the best mass produced midwoofers for a 2-way. There was a test in Voice coil where when even driven beyond its linear range it did very well. It makes a superb 2-way (with all its limitations) with a shallow waveguide. Perhaps what you mean is the fact this woofer wants a bigger than usual box, so you have ot go for a floorstander anyways and if you do, why not just do a 3-way with a 10" at the bottom
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Old 25th December 2017, 05:02 PM   #13
eriksquires is offline eriksquires  United States
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Oh, I think I know what happened! He's attempting a series crossover! My design is parallel. Unfortunately he seems to be generalizing his inability to make this woofer work in series as a general failure of the woofer, which is not what I found.

But as I have alluded to, my measurements are simply better than the spec, and maybe better than Troels. This may indeed be a driver that has been improved over time without being mentioned.


Best,

E
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Old 25th December 2017, 05:10 PM   #14
eriksquires is offline eriksquires  United States
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<< Scratching my head >> Or maybe it's the use of the notch filter up around 4kHz on the woofer.
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Old 26th December 2017, 11:45 AM   #15
Mario Pankov is offline Mario Pankov  Europe
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This woofer does not need a notch filter. I saw his design and what he got there was a diffraction effect, there is a wide wrong belief that a 16-18cm woofer will be too directional and cannot illuminate the edges. While the amplitude will not be as high as if it was a small radiator, it still does and the bump makes some female vocals sound nassal, hence his notch filter. If he did a more careful work to the baffle, this would have been avoided but it also comes down to how feasible it would be - sometimes soldering a lcr trap is much easier, Gravesen used to build these for the diy community so I can understand his drive for simplicity.
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Old 26th December 2017, 12:20 PM   #16
wolf_teeth is offline wolf_teeth  United States
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The 3.9mH/22ohm/10uF notch Troels is using is for the small energy storage peak around 700-800 Hz. This is not centered at 4k, and I don't see any other notch in the system. This blip is common in the Revelator woofers, as the 15W also has it. It makes the vocals come through a bit forced and forward without the notch in place.

Later,
Wolf
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Old 26th December 2017, 01:47 PM   #17
Mario Pankov is offline Mario Pankov  Europe
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The blip on his design (the SP95) is much wider and higher in amplitude than the one on the SS datasheet. i do not believe he is addressing a driver derived artefact but a baffle one.
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Old 26th December 2017, 01:57 PM   #18
Bill poster is offline Bill poster  Thailand
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If the baffle were curved a la magico, wd that help? I'm guessing the baffle plays a role with that rise above baffle step
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Old 26th December 2017, 03:36 PM   #19
eriksquires is offline eriksquires  United States
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Sorry, but I used a notch filter at 4khz, it's rather broad, almost too broad to call it a notch, and it helped flatten the woofer's rolloff significantly. Of course, I include my design files, so anyone who wishes to improve upon my crossover is free to do so. But I agree with everyone but Troels and Steve: This is a very nice, easy to use mid-woofer.

Interestingly, Troels uses a related 6.5" in another design, calling it the best mid-woofer he ever heard. I kind of agree. See here...

Fusion

There's another active thread on it as well:

Troel's new big 3 way classic

( I am being verbose for the sake of posterity).

Best,

E
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Old 27th December 2017, 12:21 AM   #20
rabbitz is offline rabbitz  Australia
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That's the 18M and not the 18W and it's not doing bass. Remove low bass duty from the 18W8531G00 and it becomes a much better driver.
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