anyone wanna design a bandpass

[dwright27]

ok so i need a 4th order bandpass designed for a 1989 Brnoco 2 for 4 18's with a flat response from 25 hertz - 40 hertz.

if anyone is willing to help me then let me know here or in a PM thanks.

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[Lothar34 10+ year member]

What're the subs and their specs?

 

[dwright27]

What're the subs and their specs?

would like to run the mach 5 MJ-18M's

or the IXL 18's

MJ specs:

T/S Parameters

Fs = 24 Hz

Re = 3.6 Ohms

Qes = 0.37

Qms = 5.59

Qts = 0.36

Mms = 316.6 g

Rms = 8.5 kg/s

Cms = 0.14 mm/N

VAS = 210 litres

Sd = 1029.2 cm2

BL = 21.3

Xmax = 15 mm

IXL specs:

Fs = 17.7Hz

Re = 3.4 Ohms

Qes = 0.39

Qms = 5.59

Qts = 0.37

Mms = 434.3 g

Rms = 8.69 kg/s

Cms = 0.184 mm/N

VAS = 274.1 litres

Sd = 1029.2 cm2

Xmax = 22 mm

 

[Lothar34 10+ year member]

The M5 won't go flat between 25Hz and 40Hz. You'll have to settle for 26.5-40Hz with that one, with about -1.2db at 25Hz.

Rear chamber - 3.5cuft

Front chamber - 1.88 (1 and 7/8) cuft

16 square inches of vent, 11.25" long

The IXL is perfectly flat from 25 to almost 40Hz. You'd be down about .9db at 40Hz

Rear chamber - 4.25cuft

Front chamber - 2.6cuft

16 square inches of vent, 13" long

 

[dwright27]

The M5 won't go flat between 25Hz and 40Hz. You'll have to settle for 26.5-40Hz with that one, with about -1.2db at 25Hz.
Rear chamber - 3.5cuft

Front chamber - 1.88 (1 and 7/8) cuft

16 square inches of vent, 11.25" long

The IXL is perfectly flat from 25 to almost 40Hz. You'd be down about .9db at 40Hz

Rear chamber - 4.25cuft

Front chamber - 2.6cuft

16 square inches of vent, 13" long

got a sketch up of them??

i appreciate what you have there right now though.

is the rear chamber or the front chamber vented?

 

[Lothar34 10+ year member]

The vent goes in the front chamber.

What are the dimensions of the back of the Bronco? You might have a hard time fitting four of these.

 

[DidUHearThat? 10+ year member]

 

[Buck 5,000+ posts]

check my sig

 

[dwright27]

The vent goes in the front chamber.
What are the dimensions of the back of the Bronco? You might have a hard time fitting four of these.

i had a standard ported wall in there that was 26 cubes net, and had more room but it was used an my amp rack/battery place.

arund 26 cubes though.

 

[terra 5,000+ posts]

I would make the front chamber bigger. My BP for 2 18"s is 5 sealed and 11 ported at 35hz.