the 4th order is it correct?

Thawach · 16th December 2010, 01:58 AM

hi all

i find this box, they tell 4th order i see the 2 port very bid in the front of this box. the specs use 18" driver. it make me surprise that why i can see the driver inside in the same line level. i want to know is it bandpass or bypass sub. i think it can bypass the high freq to outside. is it correct design?

epa · 16th December 2010, 10:29 AM

Quote:

Originally Posted by Thawach

hi all

i find this box, they tell 4th order i see the 2 port very bid in the front of this box. the specs use 18" driver. it make me surprise that why i can see the driver inside in the same line level. i want to know is it bandpass or bypass sub. i think it can bypass the high freq to outside. is it correct design?

looking @ the pic i say its a 4th order bandpass with the driver reversed(propably to make the box less deep)
and yes you can always filter it outside the box.

Thawach · 20th December 2010, 10:06 PM

i try to see somewhere that the port location's in front of the drivers. they have a little to design. i consider that if the port like this. the pressure of the air will drop very fast and may not has the deep bass. ok i'll not design like this

Thawach · 13th January 2011, 08:36 PM

friends a bit problem when i see this sub. it seems like bp6. but why behind the subwoofer they design like the horn but outside it has the port. i want to know the design can increase the spl output?

Thawach · 16th February 2011, 05:01 PM

surprise again! this box seems like bp4. i think why people like to build it. i simulate with HR und win isd. the respond freq seems peak a lot at the upper bass. all friends i want a lot of ur comments about this respond.thank u

Thawach · 16th February 2011, 05:02 PM

and with HR

m R g S r · 16th February 2011, 06:34 PM

that response doesn't look very good....

Thawach · 17th February 2011, 03:24 AM

Quote:

Originally Posted by m R g S r

that response doesn't look very good....

i considered a long time why they still build it. i try to see the EAW sb1000 when it does not unprocess. still likes the upper bass freq region but when low respond freq. i see the graph EAW sb1000 better than very much.

i see from this specs sheet
EAW specs sheet

m R g S r · 17th February 2011, 03:55 AM

yeah thats what i meant, the lower frequency response

Thawach · 17th February 2011, 07:42 PM

from this graph i guess that they only want the upper bass to throw away. it's possible that i think. or only want the sound of kick drum bass more than low. but again i think they use EQ to boost the low likes EAW do with EQ processor.

20th December 2010, 10:06 PM	#3
Thawach diyAudio Member Join Date: Dec 2007	i try to see somewhere that the port location's in front of the drivers. they have a little to design. i consider that if the port like this. the pressure of the air will drop very fast and may not has the deep bass. ok i'll not design like this __________________ out of the past=out of the future=in the present time+ing

17th February 2011, 07:42 PM	#10
Thawach diyAudio Member Join Date: Dec 2007	from this graph i guess that they only want the upper bass to throw away. it's possible that i think. or only want the sound of kick drum bass more than low. but again i think they use EQ to boost the low likes EAW do with EQ processor. __________________ out of the past=out of the future=in the present time+ing

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16th February 2011, 06:34 PM	#7
m R g S r diyAudio Member Join Date: Jan 2011	that response doesn't look very good....

17th February 2011, 03:55 AM	#9
m R g S r diyAudio Member Join Date: Jan 2011	yeah thats what i meant, the lower frequency response

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