Just built a box and I'm not happy with it...

[wew lad 5,000+ posts]

I took out a port, shortned the other 3 now im 37hz @ 14 cubes 150 inches of port and you know what? it actually seems it got quieter.. Like I said I put my buddys shitty 9 cft box in my car at 1 ohm on shitty hdc3's and it slaps highs, so im wondering if aeros just **** in my car? maybe i need to shrink the box, lower the tuning and move it further from the hatch. I think his si 170 inches of port, but with a slot port.

I wonder if you're getting cancellation at higher frequencies. Your cabin gain sounds like the issue here but it could be a lot of things...

 

[THATpurpleKUSH 5,000+ posts]

There's some good information in this article specifically the part that pertains to the Macan- a vehicle with cabin acoustics that favor a low resonance point.

If the Shoe Fits: Matching the Enclosure to the Vehicle

Given the volume of questions that our technical department receives on this topic, we are again publishing this Tech Talk. If you’ve ever wondered how many 18s should you put in your 99 Camaro, this is a must read! SPOILER, the answer is ZERO. We’ve all seen the DD Box system right? Work...

ddaudio.com

 

[YukonXL04]

I took out a port, shortned the other 3 now im 37hz @ 14 cubes 150 inches of port and you know what? it actually seems it got quieter.. Like I said I put my buddys shitty 9 cft box in my car at 1 ohm on shitty hdc3's and it slaps highs, so im wondering if aeros just **** in my car? maybe i need to shrink the box, lower the tuning and move it further from the hatch. I think his si 170 inches of port, but with a slot port.

What is your buddies sub and port placement on his box vs your box? Slot vs aero isnt going to make a difference if they are tuned the same with proper port area.

Sub and port placement will make a difference. Been there done that first hand.

14 cubes and 200 sq in seems to be about right. Maybe a little high on area but should be fine. Something else is going on with your setup

 

[East 10+ year member]

Sub and port placement on buddies box and mine are the same.

 

[East 10+ year member]

I wonder if you're getting cancellation at higher frequencies. Your cabin gain sounds like the issue here but it could be a lot of things...

Wouldnt other peoples yukons have that effect? seems I'm the only one hitting dogshit numbers with my setup lol.
I'm trying to plot a graph on WinISD but it's NOT working for me.

Anyone care to plot a graph and tell me a specific amount of port etc. for my woofers?