Woofsorber - thoughts on an ultra-near-field subwoofer directly behind the head

[Paffi]

Looks cool! Kind of wary about the possible resonance distortion from the casing and absorber itself but we'll see

It does remind me of something

 

[TheLastGerman]

It does remind me of something

Tell us!

 

[TheLastGerman]

Quick 'n dirty stepped sine measurement 10 - 200 Hz. Measurement mic (Beyerdynamic MM1) -> USB interface (Audient ID14 MKII) -> PC with JRiver MC 30 (no filters at all) and multichannel USB DAC (Topping DM7) -> Sub amplifier. Mic distance 10 cm.

Quick 'n dirty 2M sweep, everything else as before.

 

[TheLastGerman]

Another measurement: Stepped sine 10 - 150 Hz, this time in ASIO mode instead of JAVA. Shortest possible path - Measurement mic (Beyerdynamic MM1) -> USB interface (Audient ID14 MKII) -> Sub amplifier. Mic distance 10 cm.

What do you think about that?

 

[TheLastGerman]

Last measurement: Measurement mic (Beyerdynamic MM1) -> USB interface (Audient ID14 MKII) -> PC with JRiver MC 30 (subwoofer with 30Hz/24dB highpass and 70Hz 24dB lowpass) and multichannel USB DAC (Topping DM7) -> Sub amplifier. Mic in listener's head position.

 

[kemmler3D]

Looks quite decent, although F10 at 20hz is not amazing normally, for the setup I think it's really OK. And it looks like you've avoided room modes altogether here, which must make for a pretty nice sound while you're listening.

 

[Salt]

OT: was bedeutet der Avatar?

 

[TheLastGerman]

Looks quite decent, although F10 at 20hz is not amazing normally, for the setup I think it's really OK. And it looks like you've avoided room modes altogether here, which must make for a pretty nice sound while you're listening.

Yes, an F10 of 20Hz is definitely not SOTA, but that's not my point. I don't have a home cinema to fill with the sounds of exploding planets and tap dancing dinosaurs and in music not much happens that low down. I had hoped, but didn't really expect to get a grip on the room modes with that, so I am all the happier with the result.

Thank you for your comment!

 

[TheLastGerman]

OT: was bedeutet der Avatar?

I think that a useful explanation is out of place here. If required, please send me a private message.

 

[TheLastGerman]

Meanwhile I grasped the Hypex software (it wasn't that difficult) and now the crossover (10Hz/24dB highpass and 80Hz/48dB lowpass) and DSP for the subwoofer are running on the Hypex amp alone. I have also equalized the dips in the frequency response and compensated for the necessary digital signal attenuation (so as not to exceed digital zero) with the gain control at the input of the Hypex amp. This works very well and so the digital resolution of my main DAC is not affected.

Here are a some measurements for the sub alone. I'm not sure which microphone orientation is the right one for my particular listening situation. The most plausible way seems to me to be the average value from a measurement in the head position with the microphone vertical and a measurement on the left and right with the microphone horizontal to the center, i.e. pointed directly at the ears at a distance of 20 cm from each other. This average is therefore the basis for the EQ and the resulting measurements up to 200 Hz.

Mic horizontal, pointing like straight to ears, 30 cm distance to sub, average from two measurements with the microphone horizontal to the center at a distance of 20 cm from each other

Mic vertikal, like in middle of head, 30 cm distance to sub (virtually no difference to the previous one)

Mic horizontal pointing straight to sub, 30 cm distance

Mic horizontal pointing straight away from sub, 30 cm distance

Mic horizontal, like sitting on outer left of sofa with right ear pointing to sub, 70 cm distance

Mic vertical, like sitting on outer left of sofa with right ear pointing to sub, 70 cm distance (virtually no difference to the previous one)