space saving 4th order?

[Desousa93]

The only thing about 1:1 ratio is that the response is flat within a given range, and no peaks. but so it a simple sealed enclosure with a even broader range with no real peaks.

The bandpass may have +2-3db gain over sealed, and an advantage over in more effecient power rating,........but the range will be narrower than a sealed. And depending on the song, the lower that note, the more the enclosure will try to reproduce it as she reaches her cutoff range,.....the more you may try to turn up the volume or adjust the gain to compensate. So power handing may limit the bandpass as well. Increasing the power to produce a note at the edge of cutoff will blow your sub. This is why, back in the day, some songs sounded awesome in some friends vehicles, and some songs sounded like ass, each vehicle having a sealed,band pass or ported enclosure. And funny thing is, people would say "his system sounds like shit!". Hmmm, maybe for that song...

I had a 4th order enclosure for my old MTX 12. For the given amp, the MTX 240, she slammed.....on certain notes. Trying to play some particular song, and she blew.

Basically, just keep in mind, you have LIMITATIONS for what you want. But a 1:1 bandpass,...you might be disappointed when you can only play 1/2 of your ipod songs.

-Frank

i wanna run them off a crescendo bc2000d and not take up all of the trunk in the vic preferbaly keep it on the top shelf or use the least amount of spae on the bottom trunk level.

and i only said 1:1 because i thought itd make it smaller didnt know itd affect the Sound that Bad..

idk how to deisgn 1 to make it with a visual. i wana use the whole top shelf and port into the dash or the back seat area

i used win isd and got something i just dont know exactly what it means...

[Krakin]

Do a read through of this, it will help you on understanding ratios and different enclosures.

http://www.bcae1.com/spboxad1.htm

[Deeznutz]

I understand. It's just a trade off. Everything has a trade off. Look at the Tercel build SMD did on Youtube. The Tercel has 4 15's- ported. When he did an SPL check, the numbers steadily rose to a 15X.XX number....at 60Hz. People may brag "Listen her playa, my whip be hittin' 15X.XX dB all day long" blah,blah,blah... but he will leave out......"at 60Hz". Any lower or higher in Hz, and the SPL number will go down. See a trade off. All boxers are this way. Just chose one that suits your music, or just play 1/2 of your ipod. lol.

-Frank

[Krakin]

I understand. It's just a trade off. Everything has a trade off. Look at the Tercel build SMD did on Youtube. The Tercel has 4 15's- ported. When he did an SPL check, the numbers steadily rose to a 15X.XX number....at 60Hz. People may brag "Listen her playa, my whip be hittin' 15X.XX dB all day long" blah,blah,blah... but he will leave out......"at 60Hz". Any lower or higher in Hz, and the SPL number will go down. See a trade off. All boxers are this way. Just chose one that suits your music, or just play 1/2 of your ipod. lol.

-Frank

I don't understand where you are getting the idea it will only play half of his songs to do a 1:1 ratio 4th order bandpass.

If he get the response curve to come out to a "flat" response before cabin gain and other obstructions, then why would it be worse on one song and not the other?

I also have not seen a proper 4th order bandpass with a driver that fits the prerequisites to be in that type of enclosure, that didn't have a more extended bass shelf over a sealed enclosure.

[neuspeedescort]

Meades tercel is a poor example. i have only seen it hooked up at low power and 2 woofers. that will greatly change a box tune. it will also make a car react differently when there are two subs acting like passive radiators in a ported box. along with his res freq is much higher currently due to no deadening material being added. comparing his tercel to a bandpass design question in a crown vic is crazy talk.

you need to change the ratio volume on your winisd. i think i read it as cubic inches. if so that box is going to be tiny! the freq curve looks really nice though if its entered and calc'd correctly. comes flat at 32ish and drops off at 63ish. good and flat between. perfect for you to build an SQ set up IMO. just make sure you have some solid mid bass up front. would be nice to crossover a bit higher. make your midbass work a little less.

[Deeznutz]

An example would be when I would play the intro song to the Titanic movie. In my S-10, my Kicker competition 12 subs would play the eminous low bass tone in a decent response, but when I played that same song in my ex caviler, which had 2 boston acoustic 10 rally subs in a bandpass box per A.C. recommendations, that eminous low bass tone came alive (hitting the sweet spot), but than the sound would decrease (other bass frequencies). As far as cabin acoustics, I am now understanding how this can affect the sound as well.

I'm only extending FYI info based on past experience. My understanding about ports and bandpass' are.... as you walk towards the tuning frequency, the sound will increase, and if you walk away from the tuning frequency, the sound will decrease. This is what I experienced with a 4th order bandpass. I just feel he maybe disappointed with the sound if he is used to sealed. Look at the range of graph. It's flat but narrow. If the note is on either side of the flat part, the output will be limited.

I recently built a ported enclosure for a Hx2 (my first post). The box rocks,but I do not like the non-flat response. High slamming bass, followed by decent sounding bass.

-Frank

[Deeznutz]

LOL. I understand if you guys feel it's "crazy talk". I prefer sealed boxes over anyother based on what I have experienced.

Yes, I stand corrected Neuspeedescort, the tercel only had 2 subs working, I recall him saying that. But different boxes work for different applications. As if your music changes song to song, and you're used to listening to it in a certain way.......I GUARRANTEE HE WILL BE DISAPPOINTED. That's all I'm really saying.

-Frank

[Krakin]

-You are most likely going to have a LPF of around 80-120hz any way, so those graphs are a bit misleading, as a bandpass enclosure has the low end of the response coming from the design of the sealed portion of the enclosure, and the high end roll off will be determined by the tuning of the vented portion.

Sealed and Regular vented enclosures do not have the acoustic roll off on the upper end as bandpass enclosures do. This may be why you are feeling as if the range is much "narrower" compared to sealed or vented.

And I understand you had experience and are now starting to understand acoustics in your vehicles, but I would base your experience off of different vehicles with different drivers in use.

[Desousa93]

I only had a kicker prefab box with 2 kicker l7 12's d4 at 4 ohms witg a zx1000 before i knew what ohms and shit were i thought it alwaysbout out 1000i watts. It used to be peaky and lack Alotta of low end according to a friend

Now i wanna play with the big boys.

4th order 2k rms but be musical...

[Deeznutz]

Yeah, I recently looked at the Pioneer 80PRS. something like that. It comes with the microphone to correct cabin acoustics. This peaked my intersted. It may be my next purchase.

Sorry for stealing your thread.

-Frank