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Author Topic: DPA 4060 response chart without grids  (Read 5391 times)

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Offline Gutbucket

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DPA 4060 response chart without grids
« on: August 12, 2011, 03:12:15 PM »
DPA publishes response graphs for the 406x miniature omni mics with curves showing both the low-boost (short) grid, and the high-boost (long grid).  Those graphs are included with the mics (a generic response chart, not specfic to the particular capsule) and can be found on their website.

What has not been easy to find is a response for these mics made without either grid.  That is probably because DPA does not endorse using them without a grid, likely for protection of the capsule element more than anything.  However many users do use them without grids in an attempt to achieve the flattest response possible. I recenty found the response chart below which shows both 0 and 90 degree responses.

Note that since the capsule is mounted sideways underneath the grid in the housing, what is labled on this graph as the 0-degree response is on-axis to the internal capsule itself and not the mic housing, which is to say 0-degrees on this chart is 'side-address' relative to the mic housing.  That is pretty obvious here from looking at the included photo on the graph, but keep in mind that once a grid is installed the mic becomes 'end-address', and the offical published graphs made with the grids show only the on-axis or 0-degrees responses made with that 'end-address' orientation.

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Offline Gutbucket

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Re: DPA 4060 response chart without grids
« Reply #1 on: August 12, 2011, 03:15:50 PM »
Standard response graph showing response with short and long grids-

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Offline Gutbucket

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Re: DPA 4060 response chart without grids
« Reply #2 on: August 12, 2011, 03:27:42 PM »
The response with the short grid looks very close to the no grid response to my eye except for a flatter response with less roll-off above 10kHz when using the short grid.

Not sure what smoothing is used on either of these graphs.  Smoothing can render higher Q peaks and dips invisible which may or may not be audible.  Different smoothing applied to the two different graphs makes comparison of the two less useful.  If I had to guess, I'd say that the graph with the grids may have more smoothing than the no-grid graph, but that's purely speculation.
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Offline WiFiJeff

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Re: DPA 4060 response chart without grids
« Reply #3 on: August 12, 2011, 03:40:58 PM »
So how does the presence of the grid rotate the diaphragm 90 deg?  I mean I'm clumsy enough to do that, but not every time.

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Offline Gutbucket

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Re: DPA 4060 response chart without grids
« Reply #4 on: August 12, 2011, 04:09:30 PM »
It doesn't rotate the diaphram, but the presence of the grid modifies the shape of the housing so that the diaphram is obscured when viewed from the side and sound enters directly from the open, axial end of the housing.  The grid 'shadows' the direct line of sight to the face of the diapharam.

These things are so small as to be perfectly omnidirectional through nearly the entire frequency range so that doesn't make much of a difference except for the very highest frequencies. Even then the response difference 90 degress off axis is minimal as apparent on the no-grid graph above and on the polar response graph made with the grids (not shown here), yet I can hear a touch of additional 'air' on-axis (end-address) with the short grid installed, and usually make somewhat of an effort to orient the mic with that in mind.  In any case they are far more omnidirectional at the highest frequencies than larger mics are, so orientation with respect to frequency response is considerably less important.

Mostly just trying to clarify differences between the way the two measurments were made, even if it's pretty much inconsequential.
« Last Edit: August 12, 2011, 04:28:44 PM by Gutbucket »
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Offline John Willett

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Re: DPA 4060 response chart without grids
« Reply #5 on: August 12, 2011, 06:40:40 PM »
Very interesting - thanks.

It's pretty clear what the short grid does - its smoother, has a 3dB peak instead of a 2dB one and is back to 0 at 20kHz; without a grid its -2dB or -4dB at 20kHz.

Offline dactylus

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Re: DPA 4060 response chart without grids
« Reply #6 on: August 13, 2011, 09:36:16 AM »

Lee - thanks for the post!
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Offline Gutbucket

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Re: DPA 4060 response chart without grids
« Reply #7 on: October 13, 2015, 07:33:24 PM »
Response graphs from one particular pair of DPA matched 4061 with the low-boost, short-grids are posted here- http://taperssection.com/index.php?topic=175013.msg2163073#msg2163073
« Last Edit: February 08, 2016, 09:14:17 AM by Gutbucket »
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