Bandpass builders: I need your help!

[80INCHES 5,000+ posts]

box 1.....front 2.642 cubic ft. NET....rear 3.3 cubic ft NET......port in front chamber 6 inch round port 20.19707 inches long....tuning frequency 34.25....passband frequency 20.57 hz- 57.02 hz...........very narrow passband but very efficient......Box 2....front 1.835 cubic ft. NET.....rear 2.015 cubic ft.NET.......6 inch round port 20.20532 inches long......tuning frequency 41.09....passband frequency 23.47 hz- 71.93hz.....I would personally go with box 2........if you want to use slot ports someone here can help you convert my round port suggestion to a slot port..........Im about to go eat good luck.

both designs r a no go

80

 

[boogeyman 10+ year member]

what exactly are you looking for

 

[mobeious 10+ year member]

box 1.....front 2.642 cubic ft. NET....rear 3.3 cubic ft NET......port in front chamber 6 inch round port 20.19707 inches long....tuning frequency 34.25....passband frequency 20.57 hz- 57.02 hz...........very narrow passband but very efficient......Box 2....front 1.835 cubic ft. NET.....rear 2.015 cubic ft.NET.......6 inch round port 20.20532 inches long......tuning frequency 41.09....passband frequency 23.47 hz- 71.93hz.....I would personally go with box 2........if you want to use slot ports someone here can help you convert my round port suggestion to a slot port..........Im about to go eat good luck.

//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif//content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif

 

[marcotheclepto 10+ year member]

//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif//content.invisioncic.com/y282845/emoticons/wow.gif.23d729408e9177caa2a0ed6a2ba6588e.gif

looks like it was fed straight outta a calculator

 

[power-fanatic07 5,000+ posts]

in most 4th and 6th orders ive seen the front chamber is almost always considerably larger than the rear

 

[mobeious 10+ year member]

in most 4th and 6th orders ive seen the front chamber is almost always considerably larger than the rear

This is the "by the book way" for a flat responce but lacks in overall output

say u have a box that is 1cube sealed and .6 ported at 55hz that is going to yeld a roll off around 34hz and 59hz and the box will be flat from those 2 roll offs but with a overall output of -2db well lets keep the 1cube sealed and bump up the ported section to around 2cubes and lower our tuning freq to around 49 what that does is through a big peak in the graph u still roll off at say 34 and 59 but u have say a 8db peak at 45hz and still -2db at roll off points so u get a overall louder responce between the roll off points ... and if u play with the numbers just right u can flatten that out and keep the + gain in DB

 

[robertoyoung08 10+ year member]

i need a bandpass design too!

any takers?!

 

[mobeious 10+ year member]

shoot me a PM

 

[PV Audio 5,000+ posts]

box 1.....front 2.642 cubic ft. NET....rear 3.3 cubic ft NET......port in front chamber 6 inch round port 20.19707 inches long....tuning frequency 34.25....passband frequency 20.57 hz- 57.02 hz...........very narrow passband but very efficient......Box 2....front 1.835 cubic ft. NET.....rear 2.015 cubic ft.NET.......6 inch round port 20.20532 inches long......tuning frequency 41.09....passband frequency 23.47 hz- 71.93hz.....I would personally go with box 2........if you want to use slot ports someone here can help you convert my round port suggestion to a slot port..........Im about to go eat good luck.

Please stop, because you don't know what you're doing.

 

[PV Audio 5,000+ posts]

both designs r a no go
80

Thank you, I don't even design BPs but I know enough about their theory that that is a ludicrous design and that he didn't even think about it and instead just plugged it into a computer.

 

[bubbagumper6 5,000+ posts]

So what's a good program to model bandpasses in then? WinISD?

 

[boogeyman 10+ year member]

pv audio what is so ludacris about it....smart ass

 

[boogeyman 10+ year member]

let me tell you something pv audio Ive been doing this since YOU were two years old still shitting in diapers so dont tell me I dont know what Im doing...I have forgotten more than you even Know LIL BOY

 

[bubbagumper6 5,000+ posts]

let me tell you something pv audio Ive been doing this since YOU were two years old still shitting in diapers so dont tell me I dont know what Im doing...I have forgotten more than you even Know LIL BOY

Your only 12 years older than him...meaning when he was "shitting in diapers" you were still in junior high //content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif

 

[mobeious 10+ year member]

let me tell you something pv audio Ive been doing this since YOU were two years old still shitting in diapers so dont tell me I dont know what Im doing...I have forgotten more than you even Know LIL BOY

ok lets see what ya got .. 2.4 cubes 32hz single 12 Kerfed port

post up ur design and prove ur point