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Old 29th March 2011, 10:21 AM   #1
borispm is offline borispm  Hong Kong
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Default Taming the High Frequency of Tangband's Titanium W4

Hi guys,

I am going to order a pair of Tangband's W4-1337SD titanium cone full range drivers and I plan to run them full range i.e. no aiding tweeter or woofer.
The problem is there's a peak from 10kHz all the way up to 20kHz in Tangband's published graph and from other measurements I've seen (e.g. John a.k.a Zaphaudio) there's also a rising from 6kHz onwards.

I am pretty frustrated by that peak but I still want to give those drivers a try, which filters should I try? Should I give them a single inductor to roll off the rising response or something like an L-R trap or series notch filter?

Regards,
Boris
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Old 29th March 2011, 10:28 AM   #2
ttan98 is offline ttan98  Australia
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Hi,

try this site, MiniStatements

look at net 3

the L3011 and C3011 parallel with remove your peak.
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Old 29th March 2011, 10:42 AM   #3
borispm is offline borispm  Hong Kong
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Hi ttan98,

First of all, thanks for your reply.
I am curious why I need the capacitor to be parallel with the inductor. It looks like a low pass parallel with a high pass now.

Regards,
Boris
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Old 29th March 2011, 11:50 AM   #4
ttan98 is offline ttan98  Australia
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Originally Posted by borispm View Post
Hi ttan98,

First of all, thanks for your reply.
I am curious why I need the capacitor to be parallel with the inductor. It looks like a low pass parallel with a high pass now.

Regards,
Boris
You need a notch filter, the one shown is a variation, I use a resistor, inductor and capacitor in parallel(in another driver). To do it yourself you need to measure the rising bump and design a notch to compensate.
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Old 29th March 2011, 11:55 AM   #5
borispm is offline borispm  Hong Kong
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Hi guys, I managed to get a clearer official response graph, so the problem should be more visible now. If I opt for a single inductor, I may be losing much of the SPL above 15kHz in order to get a flatter response, and if I use an L-R trap to get rid of the broad yet abrupt peak at 10kHz to 20kHz, the rising response from 6kHz onwards will not be solved.
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File Type: jpg W4-1337SD LMS copy.jpg (927.2 KB, 449 views)
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Old 29th March 2011, 12:45 PM   #6
ttan98 is offline ttan98  Australia
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An inductor is not sufficient to remove bump, only a notch will remove a bump effectively. I suggest use this circuit first to see whether it will work effectively.
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Old 29th March 2011, 12:55 PM   #7
hm is offline hm  Europe
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Hello,
i think you overestimate "Musik" at 10 kHz, do nothing, i prefer for this driver
my KORNETT, double horn fulrange, no crossover.
over 10 kHz much SPL is for ages over 50 years not bad.
if you donīt want it change the angle 10° step by step.
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Old 29th March 2011, 12:56 PM   #8
borispm is offline borispm  Hong Kong
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Hi ttan98, can I use the L-R approach used in BSC circuits? Or will the slope be too gentle?

I want to keep things as simple as possible. I have seen some elaborated filters for this driver but I want to keep the essence of minimal components.
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Old 29th March 2011, 01:05 PM   #9
borispm is offline borispm  Hong Kong
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hm, thanks for pointing that out. To most grown ups it's not an annoying problem, but I am still quite sensitive to high frequencies.

I just can't bear the 15kHz noise that CRT TV generates, so I guess the 10dB bump will give me pretty unpleasant experience.

I understand your point on the off axis, but I guess I can have moderate amount of toe in...
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Old 29th March 2011, 01:22 PM   #10
borispm is offline borispm  Hong Kong
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hm, by the way the w4-1320 is a paper cone and seems to have more gentle breakup than the w4-1337sd so no wonder you do not need filters of any sort.
I wanted to try the bamboo cone too, but I like how the titanium cone looks and the area I'v living in is very humid so I do not want the cone to soften in spring and sound different, depending on seasons.
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