the 4th order is it correct?

[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?

 

[epa]

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]

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]

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]

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]

and with HR

 

[m R g S r]

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

 

[Thawach]

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]

yeah thats what i meant, the lower frequency response

 

[Thawach]

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.