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Author Topic: DPA 4098H miniature supercardioid  (Read 6865 times)

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Offline Gutbucket

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DPA 4098H miniature supercardioid
« on: August 09, 2013, 10:57:22 AM »
Picked up a pair of these but haven’t yet used them.  Very similar specifications to the 4060, which should work well for some of the configurations I’m looking forward to trying.  These are designed as hanging choir microphones and are likely to be better suited to far-field recording than most of their directional miniature microphones designed for close-mic'ing vocals and instruments, both in frequency response and in sensitivity.

Some specifications and graphs from the DPA website:

DPA 4098H
Pressure gradient supercardioid pre-polarized condenser
Frequency range: 20 Hz to 20 kHz, ± 2 dB 80 Hz to 15 kHz @ 20 cm (7.9 in) distance: with 3 dB diffuse field boost at 8 to 15 kHz
Sensitivity, nominal ± 3 dB at 1 kHz: 20 mV/Pa; -34 dB re. 1 V/Pa
Equivalent noise level, A-weighted: Typ. 23 dB(A) re. 20 μPa (max. 26 dB(A))
Equivalent noise level, ITU-R BS.468-4: Typ. 35 dB (max. 38 dB)
S/N ratio (A-weighted), re. 1 kHz at 1 Pa (94 dB SPL): 71 dB(A)
Total harmonic distortion (THD): <1 % up to 123 dB SPL peak; <1 % up to 120 dB SPL RMS sine
Dynamic range: Typ. 100 dB
Max. SPL, peak before clipping: 134 dB
Output impedance: From Microdot: 30 to 40 ohm; from DAD6001: 100 ohm
Cable drive capability: Up to 300 m (984 ft) with DAD6001 XLR adapter
Common mode rejection ratio (CMRR): > 60 dB from 50 Hz to 15 kHz with DAD6001 XLR adapter
Power supply (for full performance): Min. 5 V – max. 50 V through DPA adapter; with DAD6001: 48 V phantom power ±4 V
Current consumption: 1.5 mA. 3.5 mA with DAD6001 XLR adapter
Connector: MicroDot; 3 pin XLR-M from DAD6001 XLR adapter
Microphone diameter: 10 mm (0.39 in)
Capsule diameter: 5.4 mm (0.2 in)
Microphone length: 154 mm (6.1 in)
Gooseneck length: 95 mm (3.7 in)
Polarity: Positively increasing sound pressure produces positive going voltage at MicroDot pin (and pin 2 on DAD6001 XLR adapter)






Some close-up photos I took the other day follow.  The gold rectangular internal capsule appears to be identical to the 406x, only with a short interference tube made from a very dense mesh replacing the short/long omni grids, and two small vents at the back of the capsule housing.  The microdot termination, powering requirements, self-noise, sensitivity, max SPL, etc are all the same as the 4060.

Photos-
« Last Edit: August 15, 2016, 10:22:38 AM by Gutbucket »
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #1 on: August 09, 2013, 11:00:44 AM »
At some point I'll test how the interference tubes perform when placed on the 4060/4061 capsules, but lacking the rear vents, I don't expect that you could turn a 4060 into a 4098 simply by swapping the grid for the tube.  The dense stainless steel mesh or perforation of the interference tube is very tight, removing one and putting it to my lips I can blow air through the mesh, but only with significant of resistance.  The tubes are open at both ends.
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #2 on: August 09, 2013, 11:05:16 AM »
Far end of interference tube and the 406x looking capsule but with rear vented housing.  Two vents on opposing sides-
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #3 on: August 09, 2013, 11:08:02 AM »
View showing vents and interference tubes without foam windscreen.  The vents use the same stainless screen as the interference tubes-
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Offline Church-Audio

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Re: DPA 4098H miniature supercardioid
« Reply #4 on: August 09, 2013, 11:16:51 AM »
The two small vents on the back of the capsule housing are part of what makes this a card. The interference tube is only to increase directionality. With out the vents on the back of the capsule you will not have a card polar pattern. Even with the interference tube.
The combination are what help it do its magic. I would suspect that they are using a Helmholtz tuning to the back ports to make this possible.
Can you take a picture of the back of the gold capsule thats where these vents must be greeted by a tube? to direct the back pressure behind and below the capsule housing in the back.
Chris
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #5 on: August 09, 2013, 11:17:25 AM »
Plans for use-
A few different ideas.  Primarily, I plan to try them as center front/rear facing cardioids between 2m spaced 4060s in a surround decca-tree like arrangement that has worked well recording outdoor concerts.  As some of you are aware from previous threads or real life, I’ve previously used four 4060s mounted on telescopic TV antennas for this, sometimes with the omnis mounted in small spheres to give them some directionality. A few years ago I eliminated the spheres and started spacing the Left/Right omnis 2m apart instead of the 1m I would space them if I was only using two mics.  Last year I started substituting full sized Gefell cardioids or borrowed miniature AT cardioids for the front/rear mics which reduced the need for as much front/rear spacing using omnis and better isolated the direct sound in the front center mic and the audience reaction/room sound in back center mic.  The increased front/rear isolation from the cardioids combined with the increased spacing of the left/right omnis worked very well.  These 4098 will allow me to substitute DPA miniature cardioids for the full sized cards, with a sound that should be very well matched with the DPA 4060 omnis, making the 4 channel rig very compact and all low voltage powered.

I’m curious to check out their low frequency response used at taper distances, but in the configuration described above, reduced low frequency response in the center mics is not a problem and may be advantageous.  The 2m spaced Left/Right omnis provide the low end.
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Offline Church-Audio

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Re: DPA 4098H miniature supercardioid
« Reply #6 on: August 09, 2013, 11:19:10 AM »
Plans for use-
A few different ideas.  Primarily, I plan to try them as center front/rear facing cardioids between 2m spaced 4060s in a surround decca-tree like arrangement that has worked well recording outdoor concerts.  As some of you are aware from previous threads or real life, I’ve previously used four 4060s mounted on telescopic TV antennas for this, sometimes with the omnis mounted in small spheres to give them some directionality. A few years ago I eliminated the spheres and started spacing the Left/Right omnis 2m apart instead of the 1m I would space them if I was only using two mics.  Last year I started substituting full sized Gefell cardioids or borrowed miniature AT cardioids for the front/rear mics which reduced the need for as much front/rear spacing using omnis and better isolated the direct sound in the front center mic and the audience reaction/room sound in back center mic.  The increased front/rear isolation from the cardioids combined with the increased spacing of the left/right omnis worked very well.  These 4098 will allow me to substitute DPA miniature cardioids for the full sized cards, with a sound that should be very well matched with the DPA 4060 omnis, making the 4 channel rig very compact and all low voltage powered.

I’m curious to check out their low frequency response used at taper distances, but in the configuration described above, reduced low frequency response in the center mics is not a problem and may be advantageous.  The 2m spaced Left/Right omnis provide the low end.

I have to assume your low frequencies will not be as good as the 4060 only because for card you need space behind the capsule ( back plate )  for low frequency response to be decent. Where as omni only needs a tight seal and enough holes in the back plate ( tuning )  to give good bottom end response.
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #7 on: August 09, 2013, 11:25:50 AM »
The two small vents on the back of the capsule housing are part of what makes this a card. The interference tube is only to increase directionality. With out the vents on the back of the capsule you will not have a card polar pattern. Even with the interference tube.
The combination are what help it do its magic. I would suspect that they are using a Helmholtz tuning to the back ports to make this possible.

Chris

That's exactly what I was thinking.  Besides checking out what happens when putting these interference tubes on 4060/4061 capsules, I should see what happens putting the omni +3dB short grids on the 4098s.

I did notice that the solid tube portion of the interferece tube appears to be the same length as the omni short grid, probably responsible for the similar +3dB boost from 8-15kHz.  Another Helmholtz resonance thing.
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #8 on: August 09, 2013, 11:34:19 AM »
I have to assume your low frequencies will not be as good as the 4060 only because for card you need space behind the capsule ( back plate )  for low frequency response to be decent. Where as omni only needs a tight seal and enough holes in the back plate ( tuning )  to give good bottom end response.

I don't expect them to have anywhere close to low frequency omni response, although probably more bottom end than the miniature DPA cardioids designed for close-mic'ing withing the proximity effect zone. I expect them to have DPA mid/high clarity and to sound somewhat thin below 500Hz used alone, but that frequency resoponse should be complemented and compensated for by using them in combination the 4060s.

Another member here uses them immediately adjacent to 4060 or 4063 on glasses, mixing the two to blend the mid/high directionality of the supercards with the flat low frequency response of the omnis.
« Last Edit: August 09, 2013, 01:05:36 PM by Gutbucket »
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Offline Todd R

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Re: DPA 4098H miniature supercardioid
« Reply #9 on: August 09, 2013, 01:30:04 PM »
Interesting!

Thanks for the info on these.  Keep us posted on what you think.

Q for these:  Are they vertically addressed or axially addressed?  An interference tube with a vertical capsule at the bottom throws me.
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Re: DPA 4098H miniature supercardioid
« Reply #10 on: August 09, 2013, 03:00:22 PM »
Looks very cool!  I hope they serve you well, and they become a fixture for low-pro recording!!  I would have considered these had I not purchased two new sets of mics during the SP sale today!  Ended up with two complete set ups for the price of one of these mics though  :'(   Nevertheless, very interested to see how these fare in use.
DPA 4061 (unmatched HEB and stock), AT933 hypercard caps (Sound Pro), Nak 300s, chopped Nak 300s
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #11 on: August 09, 2013, 03:38:41 PM »
Q for these:  Are they vertically addressed or axially addressed?  An interference tube with a vertical capsule at the bottom throws me.

Hey Todd,
These are axially addressed, and the 406x omnis are axially addressed too- the sideways facing capsule is always completely buried within the barrel of the grid when the grid is installed. The outer edge of the barrel rim of the grid where the protective screen portion starts is maybe a millimeter or so above the top edge of the capsule with the short +3dB grid installed, and significantly above it with the +6dB grid installed.  But as you know, off-axis sensitivity doesn't fall off very much until high very high in the frequency range with very small diameter omnis anyway.  I can hear a very slight high end response difference on and off-axis with 4060/4061 while testing them at home and DPA's published polars confirm that, but it’s really minimal compared to non-miniature omnis.  I never confirmed if orientation makes any discernable difference in real world taping situations, but I still point them appropriately when I can. 


« Last Edit: August 09, 2013, 03:56:09 PM by Gutbucket »
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Re: DPA 4098H miniature supercardioid
« Reply #12 on: August 09, 2013, 03:45:49 PM »
Looks very cool!  I hope they serve you well, and they become a fixture for low-pro recording!!  I would have considered these had I not purchased two new sets of mics during the SP sale today!  Ended up with two complete set ups for the price of one of these mics though  :'(   Nevertheless, very interested to see how these fare in use.

I've wanted to try these out for a while, and was finally able to aquire a pair at a significantly reduced cost that made it attractive to do so.  The integral goose-neck will be and advantage with the application I described above.  Not sure if that feature would be a benefit or hinderance for stealth applications, depends on the setup I guess.

Enjoy your new mics!
« Last Edit: August 09, 2013, 03:57:07 PM by Gutbucket »
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Offline Gutbucket

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Re: DPA 4098H miniature supercardioid
« Reply #13 on: August 09, 2013, 03:55:46 PM »
The interference tube on the omni ought to increase directionality, but not as much as a cardioid (without tube).  You could end up with something egg-shaped at frequencies where the tube is effective.

I think that's a potentially interesting application if the FR works out OK.

Hi Jon,
I’m curious about your thoughts on what seems to me to be a unique acoustic design here (as well as Chris's and anyone else knowledgeable about physical mic design).  When I found the two small vents at the bottom of the capsule housing I realized this is not simply a 406x omni capsule housing with an interference tube installed on it.  Yet it also wouldn't seem to be a traditional cardioid design with a delayed acoustic path to the back of the diaphragm.  Without dissecting it, it would seem to be a pressure omni mounted inside in a hollow tube, with the diaphragm not terminating the tube, but small vents at the back end of the tube and an interference tube at the front end of it, and the fine stainless mesh providing acoustic resistance at both the rear vents and along the sides of the interference tube.  The omni sampling pressure variation in the tube between the entry points at either end.

I’ll take a closer look tonight, maybe shining a bright light at the vents on the base of the housing while looking into the front of the capsule opening to check if I can see light around the edge-on omni housing.
« Last Edit: August 09, 2013, 03:58:29 PM by Gutbucket »
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Offline WiFiJeff

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Re: DPA 4098H miniature supercardioid
« Reply #14 on: August 09, 2013, 06:38:40 PM »
I have been using these for several years (since they first came out), also more recently the 4081s, same mic different cable and better in a croakie.  I run them with a pair of 4063s as a "Strauss pair," low-passing the omni tracks to beef up the bass.

1) The bass response of the 4098 itself is much better than you would expect.  Where there has been a problem with the 4063 recording for any reason (like contacts needing rewiring), the 4098 recording is not bad on its own, way better than any miniature cardioid I tried before.

2) When worn in croakies the mic has directionality which is for me ideal; it cuts out much audience noise, but is not too narrow, picks up most of the forward area and brings things closer (not sure why that can be).

Jeff

 

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