I forgot to mention the extra cone control with a 6th order bandpass. So, you are exactly right! They can handle more power built correctly and therefore could have an SPL advantage! Thanks for the input and thank for watching!

Awesome, thank you!

To accurately compare a ported vs. bandpass, you would need to compare either them both walled or both no wall, etc. If you compare a walled 6th vs. a no wall or trunk ported, the 6th will definitely be louder and maybe better sound quality as well due to what you said with the mixing of the sound waves with the rest of the vehicle.

@@caraudiolab both are trunk built enclosures. I wasn't interested at the time in gutting my car to wall it off. But trunk building, the MDF slot port enclosure I had vs the 5 cube 6th order made from burch I have now. My over all bandwidth is better now with my 6th and I'm close to hitting 150db on 45hz with -3db on the tone track and I was barely hitting 140s with the slot port

Like my old bandwidth was 23hz to 70hz in the slot port and playing lows in the 20z sounded muddy and port was chuffing. 19hz to 65hz is my current range on -6db edits like DJ Siryn and it peaks at 50hz with -3db on the tone in my 6th.

@@caraudiolab I got my 6th order last year from a shop that was gonna toss it out. It was originally a 4th order for 2 12s out of a world champion USACi trunk car. So I recycled it and made it a 6th order seeing that i had 2.5 cubes in both chambers and tuned the rear port to 24hz for them windy lows I love while the front port hits the mid bass frequencies still.

@@caraudiolab also slot ports are worse when it come to linear control of the soft parts. I've already torn tinsel leads on my Sundown Xv2 and had to recone it. But I've got plenty of cone control from the air pushing against the front of the cone in the rear port chamber of the 6th

thank you!

The isobaric is really just useful if you want to make your box half the size. But yes, you still loose 3 db. However, a small series 6th with wind would be fun! I might have to try that. :)

speakerboxlite.com/

You are absolutely correct! However, I did not adjust for two reasons. #1. This can depend greatly depending on the 6th design. As an example, I personally designed/run a parallel 6th and it can't handle extra power like a series can. #2. I am assuming the same equipment for both the ported and 6th, which means the same power and subs, just a different box. Love the feedback though, I will have to make my videos a little more in depth in the future.

@caraudiolab I get your reasoning, I have a long time trying to find out what is most effective. My conclusion is that it is very hard to know. The most correct way to measure it is to divide spl on enclosure volume and use that number to define output per given size. Then, design the enclosure that is optimal for the enclosure type. If you restrict power, for example, then your condition is biased towards the bass reflex since one of the reasons why 6th order is so loud and powerful is their ability to handle extra power. I think what is louder depends on what scale you build. Below a certain size, the ports of a 6th order have to be bent to fit, making port size/shape the bottleneck that makes 6th order less loud. After a given size, ports becomes possible to be straight, aerodynamic and the correct ratio relative to the total enclosure size, at this point, 6th order I believe is louder, but only within a limited Band that I have yet to put a number on. I think your video was great. People are on different knowledge levels. If you are going to take all variables into consideration in a video about this topic, it would sound more like a research paper and most would probably lose interest due to too high complexity. ☺️

@@olekristianrannekleiv762 I absolutory love this: "The most correct way to measure it is to divide spl on enclosure volume and use that number to define output per given size." This is how I think about it as well, what gets the loudest per size. With bigger builds, I have started having to add a 3rd factor. What gets loudest per size and weight!

@@caraudiolab That is a good point, weight becomes an issue, that was actually quite relevant for one of my coming builds! Im going for a 130-150L bandpass sub. Im considering making it 4th order, but that demands even heavier subwoofer driver too.

@@olekristianrannekleiv762any details on your 6.5 6th order? Also seems like you might be preferring 4th order?