2 15'' Mags off 3000RMS?!??!

[DBfan187 5,000+ posts]

4th-order has the 2nd best transient response right after a sealed enclocure. If built correctly, it can sound amazing.

 

[vetkilr 10+ year member]

4th-order has the 2nd best transient response right after a sealed enclocure. If built correctly, it can sound amazing.

I believe your wrong..........your avatar obviously has better transient response cause I have a woody:naughty:

 

[DBfan187 5,000+ posts]

I believe your wrong..........your avatar obviously has better transient response cause I have a woody:naughty:

//content.invisioncic.com/y282845/emoticons/tongue.gif.6130eb82179565f6db8d26d6001dcd24.gif
http://www.diysubwoofers.org/bnd/4thorder.htm

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.

 

[vetkilr 10+ year member]

Dam n you................

Theyve never seen the avatar have they.

 

[squeak12 10+ year member]

Id just gain the amp down some, as they really dont need much more than 1000, but they can probably take it if you listen and watch the subs for bottoming out, etc.

 

[80INCHES 5,000+ posts]

is a 4th order bandpass just an SPL machine, or can it be used in a daily driver...
also, do you really want 2 15" mags (SQL) sub in a box like that? unless your just trying to put up numbers...will it still sound good?

my 4th order bndpass is a daily box....u can design a 4th order bp to be a spl box but mines is more for streeet beating and bass racing

80

good info dbfan

 

[Showrides]

Id just gain the amp down some, as they really dont need much more than 1000, but they can probably take it if you listen and watch the subs for bottoming out, etc.

Agreed. Just be careful with your gains, and there shouldn't be a problem. 1000rms each is all you need to really get them pounding, but they can handle more. Just be smart with the extra power and you will have no problems.

 

[CBFryman2 5,000+ posts]

Problem with 4th order is that you can drop low and be flat up to ~50 then it will slope off (6dB/octave, hence hte 4th order name) or you can sacrafice the low lows and gain some upper bass.

With some good mids 4th order would be an excelent choice for most roomy applications //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[Showrides]

Problem with 4th order is that you can drop low and be flat up to ~50 then it will slope off (6dB/octave, hance hte 4th order name) or you can sacrafice the low lows and gain some upper bass.
With some good mids 4th order would be an excelent choice for most roomy applications //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

Agreed, I really like 4th order enclosures with some high end mids. Sounds great to me.

 

[undits 10+ year member]

holy thanks for all the help.. this is perfect... what are something thats i should be looking for to set my amp gains.. i will buy a DMM, and set it accordingly... and as long as i aint blasting it all day long, and just taker easy.. and then to show off give them a little more juice i should be all good

thanks for the help guys

 

[Showrides]

holy thanks for all the help.. this is perfect... what are something thats i should be looking for to set my amp gains.. i will buy a DMM, and set it accordingly... and as long as i aint blasting it all day long, and just taker easy.. and then to show off give them a little more juice i should be all good
thanks for the help guys

We just better see some videos when you get them installed:up2somet:

 

[squeak12 10+ year member]

If you use a DMM use the following formula with a 45Hz or so tone.

Sq. rt. of (power*ohm load)

That will be the AC voltage on the speaker outs

 

[Showrides]

If you use a DMM use the following formula with a 45Hz or so tone.
Sq. rt. of (power*ohm load)

That will be the AC voltage on the speaker outs

//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

That will work.

 

[DBfan187 5,000+ posts]

forget the DMM method, get one of these - http://cgi.ebay.com/Velleman-10-Mhz-Handheld-Oscilloscope-HPS10_W0QQitemZ230007089501QQihZ013QQcategoryZ104247QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[undits 10+ year member]

lol i wouldnt know how to use a DMM yet along a Oscope.. i will work on getting the amp and the subs first.. then we will go from there.. which of coarse i will need all yoru guys help again //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

i was thinking.. even if i lose output... throwing them in a sealed box just to be on the safe side

i would go ported but that could increase the chance of them bottoming out could it not?

but also going ported will give me a far share more output, but the sealed will make it better for the double kicks all that great stuff