How loud is your system?

[Deon1818]

What sort of music do you use where you need to play so low?

Numbers seem a bit shy of where you could be with that but the box seems to play rather flat and probably sounds good with music.

If your goal is to play lower you must rebuild your port or box to tune lower. You may or may not be happy with the rest of your frequency response after you do so.

I think I'll keep this box just in case but right now 40 hz and up just hurts my ears anyways. I have a handful of rap songs saved that dip into the 20s or at least low 30s. You can't hear it so much but the air movement and chest feel are what I'm going for. I have another vehicle with a single 12 for daily. I dont compete, just take this out for a good head rattle here and there. I only know the basics for tuning so I'll see if buck is interested in doing a design. If anything I can always add something to keep up the mid bass.

 

[Buck 5,000+ posts]

Okay so I just measured the box.
Outside dimensions
45" wide 22.25" tall (including triple baffle) 50 inches deep
Port is 43.5 x 6.75
I built this box in February of 2019 and don't remember the port length but it has 3 corners. Perhaps around 25 to 27 inches?
My subs are currently inverted so no sub displacement but I miss being able to see out my rear glass. So a wall is not really ideal.
Ps @Buck I'm a big fan of your work.

Your port isn't excessively big. Might actually be alright, from what I'm seeing. The box looks like it's good quality, solid build.

Let me know if you're interested in doing a new box. I have a lot of fun making wind tunnel boxes, and I do it quite regularly. I can definitely design you a box to make stupid lows, and there's a way that I would help the air flow around the box, too, by designing it a certain way. I'm a big Fi fan, so I'd be totally down. Just let me know!

 

[Buck 5,000+ posts]

I think I'll keep this box just in case but right now 40 hz and up just hurts my ears anyways. I have a handful of rap songs saved that dip into the 20s or at least low 30s. You can't hear it so much but the air movement and chest feel are what I'm going for. I have another vehicle with a single 12 for daily. I dont compete, just take this out for a good head rattle here and there. I only know the basics for tuning so I'll see if buck is interested in doing a design. If anything I can always add something to keep up the mid bass.

I can make you hear those 20 hz notes.

 

[Buck 5,000+ posts]

5kw rated. It's a buck-box.

Are those 12's or 15's? 3012's or 3015'?

275's

I think those Deaf Bonce subs, at least the one metalhead has, I think those would work very well in a series 6th order. I've done several Deaf Bonce designs this year, and all of them seemed to have turned out well (good woofers). They seem just like a solid classic woofer design.

 

[Deon1818]

Your port isn't excessively big. Might actually be alright, from what I'm seeing. The box looks like it's good quality, solid build.

Let me know if you're interested in doing a new box. I have a lot of fun making wind tunnel boxes, and I do it quite regularly. I can definitely design you a box to make stupid lows, and there's a way that I would help the air flow around the box, too, by designing it a certain way. I'm a big Fi fan, so I'd be totally down. Just let me know!

Yes I am definitely interested, I think I sent a message but let me know if email is easier or how we can get started!

 

[Buck 5,000+ posts]

Yes I am definitely interested, I think I sent a message but let me know if email is easier or how we can get started!

I replied to you.

 

[Bobbytwonames 5,000+ posts]

I think I'll keep this box just in case but right now 40 hz and up just hurts my ears anyways. I have a handful of rap songs saved that dip into the 20s or at least low 30s. You can't hear it so much but the air movement and chest feel are what I'm going for. I have another vehicle with a single 12 for daily. I dont compete, just take this out for a good head rattle here and there. I only know the basics for tuning so I'll see if buck is interested in doing a design. If anything I can always add something to keep up the mid bass.

Try this song. It should be right up your alley. It plays from 20-40 hz. It's a Disney song but it bangs, believe me.

 

[Bobbytwonames 5,000+ posts]

Your port isn't excessively big. Might actually be alright, from what I'm seeing. The box looks like it's good quality, solid build.

Let me know if you're interested in doing a new box. I have a lot of fun making wind tunnel boxes, and I do it quite regularly. I can definitely design you a box to make stupid lows, and there's a way that I would help the air flow around the box, too, by designing it a certain way. I'm a big Fi fan, so I'd be totally down. Just let me know!

I really like the Deaf Bonce 3015's.

 

[hispls 5,000+ posts]

I have a handful of rap songs saved that dip into the 20s or at least low 30s.

Bear in mind if you dump your tuning into the mid to low 20hz range it will play those handful of tracks very loud but may fall flat on its face as you start getting into the higher frequencies where 99% of commercially available music is going to happen. Yes, I know what 20hz is and outside of home theater I don't really plan around trying to play that low because most high powered car audio subwoofers really become a one-trick-pony when people go for those wind-tunnel builds.

For reference I'm doing 160.9 @ 42hz with 4 15s on two Sundown SFB 8000s, can play safely down to about 35 with the doors and windows closed and a bit lower still if not at full power. This is a flat wall, I use some rather extreme SPL oriented subwoofers and it's not really as flat a response as I'd like, so not really apples to apples with your no-wall ceramic motor subs with a flat looking response.

 

[Deon1818]

Bear in mind if you dump your tuning into the mid to low 20hz range it will play those handful of tracks very loud but may fall flat on its face as you start getting into the higher frequencies where 99% of commercially available music is going to happen. Yes, I know what 20hz is and outside of home theater I don't really plan around trying to play that low because most high powered car audio subwoofers really become a one-trick-pony when people go for those wind-tunnel builds.

For reference I'm doing 160.9 @ 42hz with 4 15s on two Sundown SFB 8000s, can play safely down to about 35 with the doors and windows closed and a bit lower still if not at full power. This is a flat wall, I use some rather extreme SPL oriented subwoofers and it's not really as flat a response as I'd like, so not really apples to apples with your no-wall ceramic motor subs with a flat looking response.

Thanks for your advice! I think right now I am looking at tuning into the upper 20's. It seems my vehicles natural frequency is in the mid 40s, so Starting my box tune about 5 hz lower than it is now should bring my peak from the 40s back into the 30s where i want it. And should be able to play pretty solid from 20 - 50 hz and possibly higher. At least for what i consider solid. I learned i need earmuffs to comfortably listen to 40+ hz at 150+ db's so I'm okay losing a bit in that direction. I can't imagine 160 db. woof

PS. with that build, what is your box tuned to?

 

[Bobbytwonames 5,000+ posts]

I think I'll keep this box just in case but right now 40 hz and up just hurts my ears anyways. I have a handful of rap songs saved that dip into the 20s or at least low 30s. You can't hear it so much but the air movement and chest feel are what I'm going for. I have another vehicle with a single 12 for daily. I dont compete, just take this out for a good head rattle here and there. I only know the basics for tuning so I'll see if buck is interested in doing a design. If anything I can always add something to keep up the mid bass.

Seriously, listen to that song on your system and let me know what you think. My box builder told me now to play it for too long because he doesn't want me to damage my subs.

 

[Deon1818]

Seriously, listen to that song on your system and let me know what you think. My box builder told me now to play it for too long because he doesn't want me to damage my subs.

Okay I'll give it a shot tomorrow afternoon. It's late now and I work in the morning. But I'll let you know lol

 

[hispls 5,000+ posts]

It seems my vehicles natural frequency is in the mid 40s

Probably with a vehicle that long and if so you may wind up with a response curve that looks like a 2 humped camel if you tune your box lower. Have you checked out expected frequency response with those subs in your current box in some modelling software? That curve should help you see what gain you're getting from the box/port and what is cabin gain and help you to determine how far away or close together to keep box tuning from vehicle peak.

Depending on the sub and box your peak may be a fair bit above tuning, this is mostly dependent on the sub's parameters.

My build log mostly here, I have moved the Focal amp, swapped in the SFB amps and replaced most of my fronts since the last time I updated that but haven't really messed with anything in the box. Box is, near as I can figure, 24 cube, tuning is probably pretty close to my peak, but it is hard to determine how "long" a port like that is.

https://www.caraudio.com/threads/bye-bye-back-seats.589759

Wood isn't getting any cheaper so you really should try brainstorming ways to be able to build with some sort of temporary port that you can tweak tuning and do some testing before making something permanent. building 16-20 cubic foot boxes and throwing them away is going to get old fast.

 

[Firewalker]

Or possibly do a removable port so you can swap out to a different tuning which has been done before.

 

[Buck 5,000+ posts]

I think I'll keep this box just in case but right now 40 hz and up just hurts my ears anyways. I have a handful of rap songs saved that dip into the 20s or at least low 30s. You can't hear it so much but the air movement and chest feel are what I'm going for. I have another vehicle with a single 12 for daily. I dont compete, just take this out for a good head rattle here and there. I only know the basics for tuning so I'll see if buck is interested in doing a design. If anything I can always add something to keep up the mid bass.

There's quite a few rap songs that dip into the low 30's and some that dip into the high 20's. Lower tuned boxes play flatter, so when tuning low, you usually won't get as sharp of a peak based around your cabin resonance, and it'll make the lows louder and more balanced with the highs. I'm not sure how many people have experienced actually hearing 28 hz at full volume or a note like that, but most people that have a box that can hit a note like 28 hz and play it without any reservation, they never wanted to go back to a box where they lost those high 20's notes. Most people that I've designed for like being able to get down into the high 20's range. Also, bigger systems like you have just play a little differently, because the box size is so huge, so the cabin size is just getting smaller. A massive system like yours is going to be able to pressurize that vehicle very well across a wide range of frequencies, even with lower tuning. So, tuned lower may lead to a lower overall peak SPL score, but it tends to play flatter and have more even SPL across a wider bandwidth, and you get to hit lows.

I personally like larger systems tuned lower, because it makes the response significantly flatter, and the transitioning between the notes is so smooth. The high end rolls off more softly and tends to be less brutal, especially with as much power as you have, lol. Gotta have a somewhat middle ground airspace and port area, where your subs can move enough to get loud, but not too much where they start unloading with tons of power applied away from tuning frequency. On top of that, your subs are sort of low-end oriented by design, so low tuning matches the nature of your woofers.