My Single Bass Array - Page 2

JinMTVT · 15th January 2008, 03:03 AM

Focal :

you are doing great with the english ...keep it coming!
i strongly believe that english beeing a "simple" language, it is very good at transferring information even when there are many errrors in syntax or even orthograph..so do not worry ..most of us here are not english borned neway

Please explain your understanding of the planar wavefront , and also about the single/double bass array.
I am currently working on it myself ( design stage )
and would like to use any possible chances to learn more about its use.

Could you take in room measurements at different location ? do you have any mean of measuring room modes in your setup ?
i've very like to see how it performs on the lateral and vertical modes ...

if you have interesting links about DBA, please !LINK! US!

what is the Xover freq. of your front sub ?

focal · 16th January 2008, 07:31 AM

Hi Jin, thanks for flowers

.

This forum is a good possibility to learn english by doing.

In moment i have few time, I am at work

With a SBA ( better DBA) you eliminate the room modes in the length of yor room. This is the result of the planar wavefront ...

The roommodes in width and height are ever existent, but her energylevel is smaller as without SBA.

I have not understand the pysically theory of this phenomenon.
In the german forum named HiFi-Forum are a few experts of this theme an they helps me.
Look here:http://www.hifi-forum.de/index.php?a...72&thread=1358

I think the user poison nuke is good in english conversation and helps you friendly.

Briefly:
A DBA are two SBA, one in front, one in rear of your room.
The second SBA must have a inverted signal and you must make a timedelay between the SBA's.

A must have for the perfekt function of a SBA/DBA is a cuboid ( ashlar?)- shaped room.
Any jutties (?right word?), alcoves and so on, deranges the function of DBA.

My x-over frequence is 125 Hz.

Greetings

Uwe

focal · 19th January 2008, 03:18 PM

Dear friends,

some new pics.

I have finalized the speaker-covers ( the right term?)

Greetings

Uwe

JinMTVT · 20th January 2008, 04:45 AM

covers is ok i guess
i often see the use of : "driver grille"

Will you be able to take measurements of the low frequency response of your system at different location in the room ?

you should try and measure the influence of modes on your system with the DBA approach ..

maybe measure response very close to driver
and then compare to measurements at listening location
and others ..

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15th January 2008, 03:03 AM	#11
JinMTVT diyAudio Member Join Date: Jul 2004 Location: MTL	Focal : you are doing great with the english ...keep it coming! i strongly believe that english beeing a "simple" language, it is very good at transferring information even when there are many errrors in syntax or even orthograph..so do not worry ..most of us here are not english borned neway Please explain your understanding of the planar wavefront , and also about the single/double bass array. I am currently working on it myself ( design stage ) and would like to use any possible chances to learn more about its use. Could you take in room measurements at different location ? do you have any mean of measuring room modes in your setup ? i've very like to see how it performs on the lateral and vertical modes ... if you have interesting links about DBA, please !LINK! US! what is the Xover freq. of your front sub ?

16th January 2008, 07:31 AM	#12
focal diyAudio Member Join Date: Jan 2008	Hi Jin, thanks for flowers . This forum is a good possibility to learn english by doing. In moment i have few time, I am at work With a SBA ( better DBA) you eliminate the room modes in the length of yor room. This is the result of the planar wavefront ... The roommodes in width and height are ever existent, but her energylevel is smaller as without SBA. I have not understand the pysically theory of this phenomenon. In the german forum named HiFi-Forum are a few experts of this theme an they helps me. Look here:http://www.hifi-forum.de/index.php?a...72&thread=1358 I think the user poison nuke is good in english conversation and helps you friendly. Briefly: A DBA are two SBA, one in front, one in rear of your room. The second SBA must have a inverted signal and you must make a timedelay between the SBA's. A must have for the perfekt function of a SBA/DBA is a cuboid ( ashlar?)- shaped room. Any jutties (?right word?), alcoves and so on, deranges the function of DBA. My x-over frequence is 125 Hz. Greetings Uwe

19th January 2008, 03:18 PM	#13
focal diyAudio Member Join Date: Jan 2008	Dear friends, some new pics. I have finalized the speaker-covers ( the right term?) Greetings Uwe

20th January 2008, 04:45 AM	#14
JinMTVT diyAudio Member Join Date: Jul 2004 Location: MTL	covers is ok i guess i often see the use of : "driver grille" Will you be able to take measurements of the low frequency response of your system at different location in the room ? you should try and measure the influence of modes on your system with the DBA approach .. maybe measure response very close to driver and then compare to measurements at listening location and others ..