Soliloqueen's k87(k67) and k47 capsules

[neowalla]

I'm also beginning small volume production of some test m7s, 10 or 15 or so. I might send out a loaner to get some opinions on how to tune it.

Oh yes!! If you start making C12 capsules someday you will become my sole source for LDC capsules.

 

[soliloqueen]

check this out. Here are a few flat k47s with the new metal, relative to the target, and for fun, a somewhat dark k47v relative to the same target at 1/48 smoothing:


We've reached best in class performance here. The differences in sensitivity are exclusively due to the plastic spacers being too squishy. We've reached zero metal influence and near-zero diaphragm tension influence on the capsule response.
Matched at 0dB:

Let's zoom way the hell in:


These remaining differences are broadly due to minor positioning differences in the test microphone due to our rig being kind of jank and having the test speaker way too close to get over the noise. We've reached the limit of shop floor testing.

 

[bremusound]

That‘s pretty impressive!

 

[MaxxDM]

In my personal experience all the U67 I've used over the years had a “softer” or “tame” high end when compared to the U87s (different versions)

As for the U87 I don't find it's "soft" or "tame" in the high end, it's not Dark and it's not over-bright in my opinion, but it's bright, specially in the region between 5khz and 12khz, even with the de-emphasis circuit.
Most my colleague engineers find the same.

Maybe you guys have a different opinion, but I've never seen the U87 associated to a soft/tame high end.

The U67 gets feedback from a winding in the transformer, as opposed to 'local' feedback, so yes, I think that there would be phase issues, that would soften the sound on the treble.

Not sure if this was intentional or not. Usually, when a load-dependent winding is used in feedback, the design aims to minimize problems due to load mismatch.

 

[MaxxDM]

Can someone provide a link to audio comparisons between the K47 vintage and flat models?

 

[soliloqueen]

Can someone provide a link to audio comparisons between the K47 vintage and flat models?

I should really do this but I've been too busy on the business side of things to get much studio time in. Any volunteers? @tomas.borgstrom maybe?

 

[tomas.borgstrom]

I should really do this but I've been too busy on the business side of things to get much studio time in. Any volunteers? @tomas.borgstrom maybe?

I can record some acoustic guitar with an identical setup this week.

 

[soliloqueen]

I can record some acoustic guitar with an identical setup this week.

Sorry for drafting you. Only if it's convenient, thank you very much.

 

[soliloqueen]

I think for funsies I'm going to offer linen phenolic rings as an option. This won't affect the sound or the reliability, it's just because I think vintage capsules made with linen phenolic look cool

I made capsules with phenolic paper:

(Don't worry we've already replaced and pickled these screws) which looked almost the same but the weave was too small:

Which suggests that the vintage rings are the same material but with linen rather than paper. So now I'm tracking down some phenolic linen instead

 

[soapfoot]

You are my kind of insane

Loving this!

Congrats on the in-house metal

Exciting developments!

 

[MaxxDM]

I can record some acoustic guitar with an identical setup this week.

I would appreciate that, thanks from me as well!

Would it be possible to also record male voice? I'd like to hear the response to sibilants as well as the overall vocal timbre.