worth the upgrade?

[awinter 10+ year member]

I was looking to try out some new subs. Currently I have 2 12" RE SX's in a bandpass box. I wanted to upgrade to 2 DD 9512's. Amps are 2 bx1500d's. Only thing that worried me is that the cutout for the dd is 11 1/16 and my cutout for the sx's is 11 1/8. Do you think that small of a difference will even matter? Give me some input thanks.

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[DFW40 10+ year member]

not worth the upgrade

 

[SirSyko 10+ year member]

Yeah I dont think there is going to be a huge difference and you are just going to waste money.

 

[Ezekiel81923 10+ year member]

cutout wont matter....its 1/16th of an inch

the DD's will probably get louder...

SX's will sound better

i would try the SX's in a regular ported box first thought,,,

 

[JimJ 5,000+ posts]

i would try the SX's in a regular ported box first thought

With the amount of time he put into getting that thing working right, that's very doubtful //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

His is one of the only bandpass setups I've been impressed with...a true 4th order BP.

 

[mannyb18b]

True properly built 4th order > Ported

 

[Johnny Drama 5,000+ posts]

True properly built 4th order > Ported

Sure if you want to play 40hz test tones all day long. Most of us like to play bass through out all the range though.

 

[JimJ 5,000+ posts]

Sure if you want to play 40hz test tones all day long. Most of us like to play bass through out all the range though.

In this case, the n00b is right. A correctly built 4th order enclosure will have better transient response than a standard sealed box, and while it doesn't have the frequency response of a sealed setup, neither does a ported one for that matter //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

http://www.diysubwoofers.org/bnd/4thorder.htm

 

[nycspudz03 10+ year member]

Hey if you do decide to upgrade, I'll gladly take one of those bad boyz off your hands

 

[Johnny Drama 5,000+ posts]

In this case, the n00b is right. A correctly built 4th order enclosure will have better transient response than a standard sealed box, and while it doesn't have the frequency response of a sealed setup, neither does a ported one for that matter //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
http://www.diysubwoofers.org/bnd/4thorder.htm

Pulled directly from your link, guess I am still learning too //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

The 4th order or sealed rear chamber bandpass system is basically a sealed enclosure system with the addition of an acoustic filter in front of the driver. The resulting system usually provides a lower cutoff frequency, the tradeoff being a larger enclosure. The enclosure can be reduced in size by using two drivers in an isobaric configuration.

4th order bandpass systems usually demonstrate better power handling characteristics than the other main systems considered here. Its transient response is second only to the sealed enclosure systems, making it a good choice for subwoofer applications.

As all of the output of the 4th order bandpass system is via the port, the largest port diameter possible for the enclosure should be used in order to minimize port noises. The ports should be flared whenever possible, for the same reasons.

The 4th order bandpass system rarely exhibits a perfect bandpass response - there is usually some out-of-band noise present in its output. A simple notch filter can be used to reduce this noise if it is audible. Alternatively, a low-pass filter can be used in series with the driver, but the in-band response of the system may also be affected if this approach is taken.

 

[80INCHES 5,000+ posts]

Pulled directly from your link, guess I am still learning too //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
The 4th order or sealed rear chamber bandpass system is basically a sealed enclosure system with the addition of an acoustic filter in front of the driver. The resulting system usually provides a lower cutoff frequency, the tradeoff being a larger enclosure. The enclosure can be reduced in size by using two drivers in an isobaric configuration.

4th order bandpass systems usually demonstrate better power handling characteristics than the other main systems considered here. Its transient response is second only to the sealed enclosure systems, making it a good choice for subwoofer applications.

As all of the output of the 4th order bandpass system is via the port, the largest port diameter possible for the enclosure should be used in order to minimize port noises. The ports should be flared whenever possible, for the same reasons.

The 4th order bandpass system rarely exhibits a perfect bandpass response - there is usually some out-of-band noise present in its output. A simple notch filter can be used to reduce this noise if it is audible. Alternatively, a low-pass filter can be used in series with the driver, but the in-band response of the system may also be affected if this approach is taken.

already knew that //content.invisioncic.com/y282845/emoticons/word.gif.64b12e39f936af3b4fff38a1c0bd0244.gif

80

 

[Thecontender 10+ year member]

I would stay with your setup... you will just get more fart out of the DDs... If I were in your position I would shoot for somthing with better SQ, but that is just my preferance.

 

[awinter 10+ year member]

thanks for all the input ill just stick with my setup. thanks for all the props on the box I personally think it hits a wide range of notes much better than an equivalently sized ported one.