[Bumpy]

From my experience of viewing a large number of videos of Open Baffle speakers, including my own, it seems that most are visited by an echo not present at the source. This shows up predominantly in vocals and may be the reason most people post instrumental tracks.

Is there something about the way OBs react with the room that makes them difficult to record. I would love to see a really good video of OBs if anyone knows of one. That way it may be possible to determine the best way of reproducing the sound. I personally would not buy OBs based on the qualities shown on YouTube. 

[gils]

 



Joss Stone !! 

 

https://drive.google.com/file/d/1PiG_5Y4Eo5PLBxcekv5QDpXaA0HApJv6/view?usp=sharing

this open baffle with 18" + 10 " + 1" compression 

[FullRangeMan]

Most YT videos are MP3 compressed, these videos are just an help or appetizer to know the real playback performance, as they are free its a great welcome.

[gils]

Hello,

yes indeed, besides past the sound quality of the compressed files, rest not less than the feminine voices are very complex to record and all the more through loudspeakers and microphones.
the open baffles undergo the reverb of the listening room due to the back wave which rebels a lot and for that, to record an open baffle is very complicated.

best regards Gilles

[Bumpy]

Joss Stone !! 

 

https://drive.google.com/file/d/1PiG_5Y4Eo5PLBxcekv5QDpXaA0HApJv6/view?usp=sharing

this open baffle with 18" + 10 " + 1" compression 

They seem to have gone to a lot of trouble to do that and it seems that YouTube itself can convey the essence of the performance. Interesting that they took their recording very close to the drivers, which probably helped to reduce room contributions (echo)

[Bumpy]

...

[Bumpy]

Hello,

yes indeed, besides past the sound quality of the compressed files, rest not less than the feminine voices are very complex to record and all the more through loudspeakers and microphones.
the open baffles undergo the reverb of the listening room due to the back wave which rebels a lot and for that, to record an open baffle is very complicated.

best regards Gilles

Thanks Gilles, that confirms my own thinking, compounded by using just a DSLR camera with pin hole microphone.

[Bumpy]

I think this short video show the situation quite graphically. The closer the mic to the driver the truer the sound.

BUT
You only get mono and its a pretty boring video

https://youtu.be/bNr7ycxqJzY

[gils]

I think this short video show the situation quite graphically. The closer the mic to the driver the truer the sound.

BUT
You only get mono and its a pretty boring video

https://youtu.be/bNr7ycxqJzY

Smarthphone sound 

https://drive.google.com/file/d/1WJu6Djj5zgRKQ5rCUR2UBY1JW2rM-eI5/view?usp=sharing

cut at 100 Hz

now Orgue

https://drive.google.com/file/d/13LY5mSMk9P8FJ7qRFVJLeWAecGAgXIHu/view?usp=sharing

[Bumpy]

Smarthphone sound 

https://drive.google.com/file/d/1WJu6Djj5zgRKQ5rCUR2UBY1JW2rM-eI5/view?usp=sharing

cut at 100 Hz

now Orgue

https://drive.google.com/file/d/13LY5mSMk9P8FJ7qRFVJLeWAecGAgXIHu/view?usp=sharing

If that's with a Smartphone, that pretty impressive

[gils]

 

Yes, very good works



https://drive.google.com/file/d/1YAKZiVqYVER5vA4XqemCRmjj_JEvLGwe/view?usp=sharing

vidéo smarthphone and mic C2 Behringer

 

[Bumpy]

I wonder if the microphone polar response has a bearing on all this?

[gils]

Hello Bumpy,

What "polar response"  ?

thanks.

best regards Gilles

[Bumpy]

Have a read here.  Not sure what a Smartphone or camera would be. ??

http://www.azden.com/understanding-microphone-polar-patterns/

[gils]

I use for the measure a Behringer ECM8000 and for the musical recording, a pair of C2 Behringer.

for recording



recording JBL 4311b + infraflex with C2 Behringer

https://drive.google.com/file/d/1R0hJCehVY3wY04Q-pbJ_bcDtmRyDRwvc/view?usp=sharing

best regards Gilles

[Rocket_Ronny]

Boy those Behringer C2s are low priced, unreal. What is a "infraflex" and how are you getting the mic. signal into the smartphone?

Thanks

Rocket Ronny

[gils]

Hello Rocket_Ronny,

my motto is to do with cheap

it is sometimes more complicated like this but, that allows to have real result, that also makes it possible to sacrifice a speaker to make a big speaker to reproduce bass. The infraflex is a Belgian invention by Etienne Labroux that I had the joy of meeting and doing tests in agreement with high performance systems like VOTTs with a friend.



For recording, I only attached the microphones to the smarthphone, recorded the audio and did the audio / video editing with screeflow (Mac OS)

here is the infraflex is open baffle and these various montages. works of 20 Hz at 400 Hz







this is recording with smartphone , the sound is poor in bass but 115 db spl at 3 m with TPA 3116 class D   

https://drive.google.com/file/d/1WJu6Djj5zgRKQ5rCUR2UBY1JW2rM-eI5/view?usp=sharing

best regards Gilles

[Bendingwave]

Interesting speakers, as it looks like a home made exciter similar to DML/BMR technology...What is the white material used, polystyrene?

[gils]

hello,

yes  the BMR is good tweeter    for infraflex is polystyrène PSE 20 mm 

best regards Gilles