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Old 8th August 2007, 02:44 AM   #1
GOWA is offline GOWA  Canada
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Default Sibilance

I,m in the process of building a pair of Seas for my Neice and I notice some sibilance. I must admit that I have no idea how to correct for this. The drivers are P18RNX/P (H1350) woofer & 27TDFC (H1189). Except for the sibilance, they sound pretty good.
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Old 8th August 2007, 03:16 AM   #2
peter_m is offline peter_m  Canada
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I'm probably the last who should chime in and try to help, but I'm sure it would be of great help if you supplied details about your design.

If it's an existing DiY project can you post the link?

If it was all your own design, can you post the x-over diagram?


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Old 8th August 2007, 03:21 AM   #3
GOWA is offline GOWA  Canada
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Default Sibilance

This is one of Madisound's offerings. http://www.madisound.com/catalog/PDF/H1350-H1189.pdf
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Old 8th August 2007, 03:31 AM   #4
peter_m is offline peter_m  Canada
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according to this: http://www.madisound.com/catalog/pro...oducts_id=8232

"If you put the tweeter a little off to the side, then the distance from the tweeter dome to each side of the cabinet is different. This will spread out this edge refection over a wider frequency range, so you don't have a bigger problem at a certain frequency."


"In order to further reduce edge reflections, you should consider routing the speakers into the cabinet until they are flush with the cabinet face."


Also you could put some felt padding around the tweeter to reduce reflections off the baffle... Beyond that, you might have to start playing with the x-over components....
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Old 8th August 2007, 03:38 AM   #5
peter_m is offline peter_m  Canada
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http://www.htguide.com/forum/showthread.php4?t=26856


If this link is accurate, then this speaker is made to be played against the wall since no BSC was accounted for. Meaning if you place the speaker away from the wall, you won't get enough low end (or too much high end).
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Old 8th August 2007, 10:33 PM   #6
SamL is offline SamL  New Zealand
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Sounds like the tweeter may a bit 'hot'.

Try to contact Madisound about this and they should know how to tame the tweeter further. If you have a test tone CD, you may find out the sibilance frequency and this will help them to come out with a better solution.
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Old 8th August 2007, 11:18 PM   #7
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What is the woofer XO point?

How steep is the woofer LP?

Could be the woofer is adding to the listening range and not the tweeter that is hot.

One crude test I can think of is to use an equalizer, and wire only woofer / tweeter in turn (through the respective crossover and putting in a nominal resistor in replace of the other driver), and see if the sibilance is coming more from the tweeter or woofer.

PS: I have a similar problem at the moment!

David.
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Old 8th August 2007, 11:31 PM   #8
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Hi GOWA,

salas posted this very useful piece of information on this post:
http://www.diyaudio.com/forums/showt...38#post1239638

Quote:
To my knowledge it was not some local notch (popular legend with the reviewers) but a gradual tailoring, 2- 3dB the most. That, can be found in Spendor and Harbeth larger monitors too.

I found this also, from Lynn Olson:

"The Ariel now sounded sweet, relaxed, and natural. The 2-meter on-axis measurement (shown above with no response smoothing) followed the intended 2dB slope from 100Hz to 10kHz with a very mild recession around the 3.8kHz crossover region. This is the classic "BBC dip", and much preferable to a "forward" emphasis in the upper midrange. Since ear is approaching its greatest sensitivity in the 2-5kHz region, even very small peaks create an unpleasant and unnatural sibilance. By contrast, a small dip in this region results in a slightly more distant perspective, and a more relaxed sound.''
My ears certainly don't listen flat and I think my new speakers which measure flat, on-axis at 1 meter yet have 1 - 2dB more output in the 2 - 6KHz region over my tower speakers are way too forward / bright.

My designs from now on will be to tilt this down. I've noticed Zaph does this via a shelving circuit before tweeter XO circuit (a resistor and low value inductor in parallel wired in series with the tweeter) as an alternative to mucking with L-Pads.

David.
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Old 8th August 2007, 11:39 PM   #9
SY is offline SY  United States
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Could your speakers be telling you the truth? Sibilance seems to be the rule, not the exception, on modern recordings and masterings.
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Old 8th August 2007, 11:40 PM   #10
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Hi GOWA,

Infact - read the whole post from the thread link I posted above.

Esp. post #30 which makes a lot of sense to me and may help you.

Cheers,
David.
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