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Etymotic Mc5 AccuChamber Side Branch Diagram; Acoustic Sound Tuning

post #1 of 8
9/11/10 at 8:20pm
Thread Starter 

http://g-ecx.images-amazon.com/images/G/01/electronics/detail-page/AccuChamber_large.jpg

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post #2 of 8
9/11/10 at 8:42pm

What a complex piece of engineering! Thanks for posting it up.

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post #3 of 8
9/12/10 at 7:09pm
Thread Starter 

One thing I don't quite understand is the acoustic side branch, particularly the L2 R2 C2 symbols, ect. Anyone have an idea of what they are? Seems like a circuit diagram, but I don't think it's a crossover.

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post #4 of 8
9/12/10 at 8:35pm

Yeah, those symbol are meant to be confusing. However, if I have read the patent that Ety filed for MC5 correctly, L2 (coil) is basically an auxiliary air duct (side tube), R2 (resistor) is basically an acoustic damper (filter), and C2 (capacitor) is basically an acoustic capacitance (empty space)

 

The design is meant to absorb excess acoustic energy and tune the sound. Any unwanted peaks will penetrate over the damper from the side tune (while normal sound wave won't get pass easily due to by the damper's acoustic impedance) and get trap in the empty space and loses its energy. The overall result will be a smoother FR curve.

 

 

Quote:
Originally Posted by stevenswall View Post

One thing I don't quite understand is the acoustic side branch, particularly the L2 R2 C2 symbols, ect. Anyone have an idea of what they are? Seems like a circuit diagram, but I don't think it's a crossover.

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post #5 of 8
9/13/10 at 11:30am

Mmh, they isolate like an er20?.

http://www.etymotic.com/aer/pk/pk-print/er20-3x3.jpg?iact=hc&vpx=497&vpy=68&dur=437&hovh=225&hovw=225&tx=161&ty=93&ei=zG2OTJrPEIzaOIqx5e0I&oei=zG2OTJrPEIzaOIqx5e0I&esq=1&page=1&tbnh=146&tbnw=146&start=0&ndsp=29&ved=1t:429,r:2,s:0

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post #6 of 8
9/13/10 at 6:56pm

No. MC5 isolate several times better than ER20.
 

Quote:
Originally Posted by Nachash View Post

Mmh, they isolate like an er20?.

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post #7 of 8
9/13/10 at 7:47pm
Thread Starter 

Thank you ClieOS for the explanation, greatly appreciated!

 

Right now I am listening to them with Monster SuperTips (yeah, Monster, I know...) I wonder if tube 3 tailors the sound much, an the Supertips are not as constrained on the tip as the tri-flange is.

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post #8 of 8
10/2/11 at 9:11pm
Thread Starter 
This video immediately reminded me of Etymotic's dampening side branch:
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