This a good box

eddiem67 said:

you sure about this, I would really hate to flame a moderator. Now if your talking an ABC box that is a completely different story.

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If you feel the need to flame anyone, even a moderator, go ahead. I opened the door up for you. Educate me.

Let's see some graphs!!!

Here are some things I like to see:
1) Bode plot
2) Transconductance chart
3) Impedance curve
4) S/N ratio
5) Frequency response
6) -3dB and -6dB curves
7) Smith chart
8) Excursion limit

Oh btw, I like to see some real performance numbers, not some Windoze software simulation.

Well I did a output curve, I can do excurision, impedance, spl limit if you like, but I believe the most important is output.

Unless your an SPL freak then even a 6th order setup would be better than a 4th order, I will email you the plot, as you will see that taking a single brahma 12 slot ported has a better output between 20Hz to 100Hz, where a 4th order (bandpass) has an output peak between 30Hz to 60Hz. At 20Hz, ported is 4 dbs louder than bandpass, At 40-60Hz, ported is 2dbs louder than bandpass, at 70Hz, ported is 3.5 dbs louder than bandpass, at 80Hz ported is 6dbs louder than ported, so just by looking at the output, ported is louder than bandpass. I emailed you the graph, if you can post it I would appreciate it so everyone can see a comparison. That being said bandpass is exactly what it says it pass a certain frequency depending on tuning an allows the sub to play that frequency without over exerting the sub, but a slot port tuned low will sound better and still not work as hard. I have owned sealed, bandpass, ported, used the same same in all three enclosure and determined that I like ported. You said a properly tuned box, I haven't seen anyone on this forum building a bandpass enclosure to spec for their sub, they are buying prefabs, and YOU know you cant just throw any old sub in there.

If anyone would like to see the graph give me your email so I can send it, I cant post a word doc on here, or can I?

finese1 said:

I had to laugh about cause this argument comes once a month.

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This isn't a case of argument, and for you to laugh about it shows how much you don't know. BTW, HF defined isn't 60-70 Hz, it's 3-MHz to 30-MHz. Check this.

I don't disagree that a slot-ported box will give you more output compared to a sealed or bandpass. But to state that "bandpass boxes suck" without any reasons doesn't justify an adequate answer. At my work, if my manager asks me why I prefer Altera FPGA over Xilinx FPGA, and if my answer were, "Xilinx sucks," guess who's not going back to work?

I know all about simulation and prediction, heck, even took a class about image reconstruction using prediction. Sure, 95% of the time, they will indicate a very real world result, but it's that 5% of uncertainty that's needed to be fully realized.

In my limited time in the car audio installation and building experience, I've never had to build a bandpass (or bandstop) box since no one asked for one. Also, it's very hard to build one even with all the Thiele & Small parameters input to the software.

I've dealt with JL, Kicker, RF, Kenwood, MTX, Eclipse, just the "main-stream." Of course, I'd loved to have dealt with the Velodyne servo-controlled, Focal, or CV Stroker, but I had no control of what brand the company decides to carry.

Back on topic, jeremy89, the best way to decide is to take your own music and try out the various sub & box combination the audio store has. Go to mainstream and local shops to compare, just don't buy out of haste.