Sigberg Audio Inkognito: Building a "design" subwoofer that actually sounds good

[EJ3]

Room coupling
A I guess not scientifically proved idea is that having the driver facing close to a wall or floor will reduce the room node problems for that specific plane. I don't have any other proof for this than measurements and listening tests and anecdotal evidence from testers (see below). But my impression is that the fact that both the driver is very close to the floor/wall, and the entire enclosure also is very shallow, somehow reduce issues with room nodes. I get less room interaction with this subwoofer than a regular sealed subwoofer at the same position. It also works very well half way up the wall (even less nodes triggered).

An experience that I have noted with my pair of floor firing (port tuned to 29 HZ) passive 12 INCH build.

 

[audiofooled]

I had an idea of building a couple of "shallow" ones but my wife says I don't need any more subs, so I'm out of luck. She's scared enough of the setup as is.

 

[sigbergaudio]

Adjustments to the low-end roll off and limiter similar to what was recently done to the 10D (as mentioned here: https://www.audiosciencereview.com/...ubwoofer-sigberg-audio-10d.18812/post-2250511) have now been implemented to the Inkognito as well.

Below is a nearfield measurement of old (red) and new (blue) tuning.

 

[sigbergaudio]

Pretty clean setup, pictures from a customer in Denmark with two Inkognito subwoofers. One in the front, and one hidden behind a fake wall

 

[sigbergaudio]

Adjustments to the low-end roll off and limiter similar to what was recently done to the 10D (as mentioned here: https://www.audiosciencereview.com/...ubwoofer-sigberg-audio-10d.18812/post-2250511) have now been implemented to the Inkognito as well.

Below is a nearfield measurement of old (red) and new (blue) tuning.

View attachment 442755

After some further testing I've concluded that this was a little bit aggressive. If we are to keep this, we have to tune the limiter so that we lose some of that upper bass (40hz and up) punch that these subs are really good at, so the updated production tuning will be somewhere in the middle of these two graphs.

 

[Comma]

After some further testing I've concluded that this was a little bit aggressive. If we are to keep this, we have to tune the limiter so that we lose some of that upper bass (40hz and up) punch that these subs are really good at, so the updated production tuning will be somewhere in the middle of these two graphs.

Please keep os updated on what you end up with.

 

[sigbergaudio]

Please keep os updated on what you end up with.

We'll end up with roughly something along the lines of the blue graph here. Green was the original tuning and the red was the "agressive" one that we'll dial back again a bit.

At 15hz we're now looking at an increase of about 4dB compared to 6-7dB with the agressive version.

Please note that all our product are subject to continuous development and improvement, so this may change in the future.

 

[Comma]

So what's the reason you dialed it back in the 10D thread you mentioned it gave lower group delay?

 

[sigbergaudio]

So what's the reason you dialed it back in the 10D thread you mentioned it gave lower group delay?

I wrote why in #165

It gave lower group delay, and this updated tuning still have lower group delay, and also note that even the original group delay was well below the audible threshold.

 

[Vacceo]

Have you tried them on Dirac DLBC? They seem to be an amazing device to run it.

 

[sigbergaudio]

Have you tried them on Dirac DLBC? They seem to be an amazing device to run it.

Nope, haven't tried DLBC. Personally I don't even have multi-channel in any of my systems anymore, just 2-channel and manual EQ.

 

[chelgrian]

Random questions about the 10D

What do the ‘remote’ connectors visible in the photos do they don’t seem to be mentioned in the manual?

What is the rational for not having a 12v trigger I find that a lot of the material I listen do has variable bass content and I find signal sensing systems unreliable.

 

[sigbergaudio]

Random questions about the 10D

What do the ‘remote’ connectors visible in the photos do they don’t seem to be mentioned in the manual?

What is the rational for not having a 12v trigger I find that a lot of the material I listen do has variable bass content and I find signal sensing systems unreliable.

We are using a Hypex manufactured plate amp. The remote in/out connectors are not in use in our application, thus not covered in the manual.

Unlike most plate amps, these have configurable sensitivity + configurable gain. The two combined should allow you to find an auto-detect setting that works in almost any situation. The default sleep timeout is also 60 minutes, so they will stay awake during silent parts of music or movies. Finally, the auto-detect can be turned off (always on).

 

[sigbergaudio]

A new option is now available for the Inkognito. In addition to (or instead of) the wall mount, you can now get a pair of stylish and clever feet for vertical placement. We currently have a bracket system that is mounted to the subwoofer with bolts for vertical placement, but it is both somewhat cumbersome to install and isn't super pretty. These will be phased out and replaced by this optional add-on. The subwoofer can of course be installed vertically without feet as well, but then one should at least put something under it to prevent scratches.

The new feet stabilize the subwoofer better, making it less likely to tip over even when pushed. They also match the color of the sub (black or white respectively).

The feet fit securely to the subwoofer without any hardware or tools. Just drop the subwoofer gently onto the feet, and they will stay in place, even if you lift the subwoofer.
The soft surface covering both the inside and bottom of the feet ensures no damage to either sub or floor, and also absorbs vibration.

 

[just1n]

A new option is now available for the Inkognito. In addition to (or instead of) the wall mount, you can now get a pair of stylish and clever feet for vertical placement. We currently have a bracket system that is mounted to the subwoofer with bolts for vertical placement, but it is both somewhat cumbersome to install and isn't super pretty. These will be phased out and replaced by this optional add-on. The subwoofer can of course be installed vertically without feet as well, but then one should at least put something under it to prevent scratches.

The new feet stabilize the subwoofer better, making it less likely to tip over even when pushed. They also match the color of the sub (black or white respectively).

The feet fit securely to the subwoofer without any hardware or tools. Just drop the subwoofer gently onto the feet, and they will stay in place, even if you lift the subwoofer.
The soft surface covering both the inside and bottom of the feet ensures no damage to either sub or floor, and also absorbs vibration.

View attachment 454404
View attachment 454405

Following your catalog closely when budget allows. Love watching what you are developing.

 

[sigbergaudio]

Following your catalog closely when budget allows. Love watching what you are developing.

Thank you, I appreciate the feedback!

 

[sigbergaudio]

Every single product we ship is measured against a reference. The unit to unit consistency is pretty good too. Here are the measurements of two Inkognito subwoofers enroute to the same customer. The difference in the higher frequencies is likely because the microphone has moved a tiny bit. This is a measurement with no smoothing.

 

[sigbergaudio]

The Inkognito keeps evolving, here's a prototype for something that hopefully works out as planned. More to come.

 

[Everett T]

The Inkognito keeps evolving, here's a prototype for something that hopefully works out as planned. More to come.

View attachment 500135

Dimensions?

 

[sigbergaudio]

Dimensions?

About 210mm long and 60mm wide.