Inexepensive SDC on blowout 33€ (Avantone CK1?)
« on: November 14, 2017, 11:58:58 AM »
Hi guys. I think this is a steal. I am pretty sure this is rebranded Avantone CK1 relative. No SMD. Looks easy to mod, sounds very usable stock. On blowout at Gear4Music. I treat you with some pics :)

https://www.gear4music.it/it/Registrazione-e-computer/SubZero-SZC-100-Pencil-microfono-a-condensatore/10GS

« Last Edit: November 16, 2017, 06:15:59 PM by kingkorg »


Re: Inexepensive SDC on blowout 33€ (Avantone CK1)
« Reply #1 on: November 14, 2017, 11:59:43 AM »
Guts

Re: Inexepensive SDC on blowout 33€ (Avantone CK1)
« Reply #2 on: November 14, 2017, 12:00:21 PM »
And glory

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #3 on: November 14, 2017, 01:11:39 PM »
This looks like right schematic. Component numbers dont match tho.

Khron

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #4 on: November 14, 2017, 02:41:27 PM »
I kinda figured that would indeed be a Schoeps + DC-DC, by the pair of transistors near the XLR, and the pair of grey-green inductors there ;D
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

RuudNL

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #5 on: November 15, 2017, 03:16:37 AM »
How are the capsules?
Probably a bit 'bright'?
(I saw that the transportation costs from Sweden are considerable...)
« Last Edit: November 15, 2017, 07:37:42 AM by RuudNL »
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Khron

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #6 on: November 15, 2017, 04:03:11 AM »
That's odd, Gear4Music is a british company - why and how would they be shipping from Sweden?
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Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #7 on: November 15, 2017, 05:10:19 AM »
I received mine from Sweden. It was about 10€ for pair to Norway.  Not sure about costs to the rest of Europe.

Yes they are bright, but not as bright as typical k67 copy. They have different curve to them. They have peak at 7Khz, most if my mics have a dip there.

Would like to find screw on grille that i can fit large capsule in. M Joly had this option for MXL with his K47.

RuudNL

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #8 on: November 15, 2017, 06:17:17 AM »
Gear4Music is a british company - why and how would they be shipping from Sweden?

Strange indeed. Even if you order them from the UK website, they have to come from Sweden it seems.
There is a solution for every problem!

http://www.vansteenisaudio.nl

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #9 on: November 15, 2017, 11:03:56 AM »
Could be that remaining items that are on sale are physicaly in Sweden.


RuudNL

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #10 on: November 15, 2017, 12:49:04 PM »
Although I hate to pay a lot of money for shipping only, I ordered a pair.
Let's see what we can make of them!
The construction with discrete components makes it very easy to 'tailor' them to your needs.
Thanks again for the tip!
There is a solution for every problem!

http://www.vansteenisaudio.nl

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #11 on: November 15, 2017, 03:50:36 PM »
Wow, that is awesome. I ordered another pair. Waiting for your ideas :)

Capsule itself is super easy to mod. But where to start? Change air chamber volume. Widen, or shrink holes. Use thicker spacer betwen backplate and membrane.

Marik used to mod these capsules, i found an image and i saw different backplate.
« Last Edit: November 15, 2017, 09:10:15 PM by kingkorg »

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #12 on: November 16, 2017, 09:32:57 AM »
Update.

I did usual EQ mod to it. 2x10K resistors after FET with 800pf cap.

As i just cleaned friends u87 with dirty capsule i did quick measure, and just for reference i used untouched Studio Projects C1 as typical bright mic.  50cm from my monitors, exact same spot.

Magenta is U87 old, non AI, black model.
Green is SubZero SDC
Yellow is Studio Projects C1


Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #13 on: November 16, 2017, 09:36:50 AM »
And this is circuit frequency response after mod.

RuudNL

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #14 on: November 16, 2017, 01:52:12 PM »
What is the difference between your last measurement and the ones before?
(Because all the 'ripples' are gone now!)
There is a solution for every problem!

http://www.vansteenisaudio.nl

Khron

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #15 on: November 16, 2017, 02:17:05 PM »
Rippled ones are interface -> amplifier -> speaker -> room -> mic -> interface, and the flat ones are interface -> jfet gate -> xlr ->interface, i'm guessing?

What is the difference between your last measurement and the ones before?
(Because all the 'ripples' are gone now!)
Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #16 on: November 16, 2017, 04:03:37 PM »
Difference between these two pictures?

First one is acoustic measure with three diferent mics as described, the other one is just injected signal directly into the SubZero with mod to show what kind of HF reduction it does :)

RuudNL

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #17 on: November 17, 2017, 11:17:04 AM »
Aha, I see. (I thought you had improved your acoustical measurement significantly!  ;D )
There is a solution for every problem!

http://www.vansteenisaudio.nl

MagnetoSound

Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #18 on: November 17, 2017, 03:12:29 PM »
Sorry for such a 'subjective' request, but as a listener, how would you characterise the tone of that 900 Hz peak in relation to the rather flat upper end?
« Last Edit: November 17, 2017, 03:15:37 PM by MagnetoSound »
Dan

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Re: Inexepensive SDC on blowout 33€ (Avantone CK1?)
« Reply #19 on: November 17, 2017, 04:55:59 PM »
It's whole area between 500hz and 1k that is boosted. That peak stands out, but it is present in C1 as well. I am pretty sure it's my room or speaker as it' present even with ECM8000 measurement mic.

Could be pattern and capsule type diference.

Subjectively i dont hear it poking through.

Here is another picture with other mics, same peak present.
« Last Edit: November 17, 2017, 05:01:01 PM by kingkorg »