Featured 2018 Toyota Sienna minivan with 2 DB4515R on 2 Taramps Smart 8 Bass

[CertifiedHoodClassic]

I decided to add a second layer to the front. It's ready for the headliner to go back on now. It should just go on with cutting some of it out and removing insulation from the back, fingers crossed.

Pardon the mess. I laid tarps to protect the interior. That black box is a space heater which I put in the car to keep it warm so the panel bond could cure properly.

This is a metal piece I made to bolt the top end of the stripper pole to. I bought one from here: https://jims-machineworkx.myshopify.com/collections/box-braces-and-supports/products/box-brace-kits

 

[shredder1 10+ year member]

I decided to add a second layer to the front. It's ready for the headliner to go back on now. It should just go on with cutting some of it out and removing insulation from the back, fingers crossed.
View attachment 62369
Pardon the mess. I laid tarps to protect the interior. That black box is a space heater which I put in the car to keep it warm so the panel bond could cure properly.
View attachment 62370View attachment 62371View attachment 62372View attachment 62373View attachment 62374View attachment 62375
This is a metal piece I made to bolt the top end of the stripper pole to. I bought one from here: https://jims-machineworkx.myshopify.com/collections/box-braces-and-supports/products/box-brace-kitsView attachment 62376

Adding mass to that Minivan roof and overdoing it especially up front should yield fantastic results all by itself, a stripper pole to calm the front of the roof @ the windshield even more is like money in the bank. I'm unsure how loud your setup gets but its difficult to damage glass if the cabin is solid especially where it counts.

 

[shredder1 10+ year member]

I'm aware of the damage a pair of 4515's can do, I just designed this for 13ply Baltic Birch and a 10" Bap for an Impala trunk. Crossfire 12K powering it with like 90ah of cmaxx. Happily the rear deck is already vented into the cabin substantially so the sound won't be completely trapped. I hate the "gorilla in the trunk" that happens when most output is trapped in the trunk.

Largish airspace and demo-daily tuning should be what the guy wants. Bassheads are not easy to please... they always want more... haha. The 10" Aeroport was used in his last enclosure but without the outer flare, doing that is like shooting yourself in the foot at his power levels Imo. Both flares are necessary to benefit from an Aeroport.
The flares help transitioning airflow into both environments (cabin/enclosure) decreasing boundary layer turbulence.
The increase in efficiency at both ends actually causes laminar airflow to almost match core velocities. The increased efficiency especially manifests at high output and "greases the air" where most compression would happen at hi-output levels with a round port.

 

[CertifiedHoodClassic]

Adding mass to that Minivan roof and overdoing it especially up front should yield fantastic results all by itself, a stripper pole to calm the front of the roof @ the windshield even more is like money in the bank. I'm unsure how loud your setup gets but its difficult to damage glass if the cabin is solid especially where it counts.

Good to hear, I'm hoping all this will keep the windshield together. I have an spl labs mini bass meter but haven't metered the car yet. I'd guess I'm playing comfortably over 140 db rn, but I've been keeping it down because of the flex.

I'm aware of the damage a pair of 4515's can do, I just designed this for 13ply Baltic Birch and a 10" Bap for an Impala trunk. Crossfire 12K powering it with like 90ah of cmaxx. Happily the rear deck is already vented into the cabin substantially so the sound won't be completely trapped. I hate the "gorilla in the trunk" that happens when most output is trapped in the trunk.

Largish airspace and demo-daily tuning should be what the guy wants. Bassheads are not easy to please... they always want more... haha. The 10" Aeroport was used in his last enclosure but without the outer flare, doing that is like shooting yourself in the foot at his power levels Imo. Both flares are necessary to benefit from an Aeroport.
The flares help transitioning airflow into both environments (cabin/enclosure) decreasing boundary layer turbulence.
The increase in efficiency at both ends actually causes laminar airflow to almost match core velocities. The increased efficiency especially manifests at high output and "greases the air" where most compression would happen at hi-output levels with a round port.

That's gonna be a sweet setup! Him and I have similar tastes for the box too, I went with 7.5-8 (I forget the exact) cu ft tuned to 28.

 

[shredder1 10+ year member]

That's gonna be a sweet setup! Him and I have similar tastes for the box too.

Bassheads like it low and loud without peakiness. Those 9515s don't become peaky until a super large airspace is used. I liked 4.2ft3 ea @ 30hz (approximately) knowing he likes lows and wants some under 25hz content.
The guy building the enclosure is the same from the SoloX build thread. I threw him a curveball on this one as certain parts are irregular and require a different assembly order.

Check out the window brace...

 

[CertifiedHoodClassic]

Bassheads like it low and loud without peakiness. Those 9515s don't become peaky until a super large airspace is used. I liked 4.2ft3 ea @ 30hz (approximately) knowing he likes lows and wants some under 25hz content.

I know I certainly do. I don't drive around listening to test tones. I listen to music and I want it to sound good. Chasing high numbers and limiting the bandwidth of the system would be fun, but this is my daily so music is #1.

The guy building the enclosure is the same from the SoloX build thread. I threw him a curveball on this one as certain parts are irregular and require a different assembly order.

Check out the window brace...

Lol. All the odd fractions, internal cuts, radius cuts etc. Really makes you wish you had access to a CNC machine for it I saw that thread. It was cool.

My box had it's own problems, because of the metal frame. I had to build it with a slight gap for the construction adhesive to fill. It was also awkward getting the fit right because of my 45 degree angled side. I think on some of the pics you can see where I messed the part up, and cut and re-welded it:

 

[shredder1 10+ year member]

My box had it's own problems, because of the metal frame. I had to build it with a slight gap for the construction adhesive to fill. It was also awkward getting the fit right because of my 45 degree angled side. I think on some of the pics you can see where I messed the part up, and cut and re-welded it:

View attachment 62415

What you went thru building the enclosure is certainly above and beyond what most would subject themselves to. That window brace and assembly did did cause issues. I got a call and after a short discussion everything was cleared up.

Later last night I asked if it was difficult or just time consuming putting everything together. He said "difficult ASF"... Haha. But it's probably fully assembled now. I'm not calling anyone after a certain hour. He was up VERY late finishing it up.

I reviewed your entire thread and am staggered by the hours you most likely have invested. Once completed and with that second 8k in there it's going to be a sleeper beast.

 

[CertifiedHoodClassic]

What you went thru building the enclosure is certainly above and beyond what most would subject themselves to. That window brace and assembly did did cause issues. I got a call and after a short discussion everything was cleared up.

Later last night I asked if it was difficult or just time consuming putting everything together. He said "difficult ASF"... Haha. But it's probably fully assembled now. I'm not calling anyone after a certain hour. He was up VERY late finishing it up.

I reviewed your entire thread and am staggered by the hours you most likely have invested. Once completed and with that second 8k in there it's going to be a sleeper beast.

Thanks! Been happy with it so far, sounds good and gets down. The finished result will probably put up good numbers too.

How'd he wind up cutting it? Does he use a router?

 

[shredder1 10+ year member]

Thanks! Been happy with it so far, sounds good and gets down. The finished result will probably put up good numbers too.

How'd he wind up cutting it? Does he use a router?

Oh, he made me window brace exact, rounded edges and all. He's been a professional installer all his adult life until about 6mos ago.

Now he just does side work audio wise.

I'm curious what #s you expect from your van? I try to stay reasonable and modest when asked.
Those meters are brutal expectation wise

 

[CertifiedHoodClassic]

Oh, he made me window brace exact, rounded edges and all. He's been a professional installer all his adult life until about 6mos ago.

Now he just does side work audio wise.

Awesome man.

I'm curious what #s you expect from your van? I try to stay reasonable and modest when asked.
Those meters are brutal expectation wise

I'm hoping for 150+ db peak on music. I imagine the peak will be around 35-40 hz, but I'm not entirely sure. I don't think my meter does averaging so I'll just look at peak.

I'd also like to do 145+ at 28-32, that would be great.

My only real meter experience is some cars I've heard at meets and what they metered, and metering my old setups.

 

[Old_Slapper]

Very nice!

But do it bump, doh?

I'm sure it does.

 

[CertifiedHoodClassic]

Very nice!

But do it bump, doh?

I'm sure it does.

Hell yeah it does

 

[SPLBassJunkie]

This looks great. I love the box bracing that's a sick idea. I may have to borrow/steal that if you don't mind

If I can do a ~150 at 31hz (@13.5v) then you should easily be able to do the same or better with this thing. You may peak higher though due to your cabin space and no-wall build having all that open air but damn... this thing would get down hard for sure

 

[CertifiedHoodClassic]

This looks great. I love the box bracing that's a sick idea. I may have to borrow/steal that if you don't mind

Go for it. It's tougher to build but it's very light and stiff.

If I can do a ~150 at 31hz (@13.5v) then you should easily be able to do the same or better with this thing. You may peak higher though due to your cabin space and no-wall build having all that open air but damn... this thing would get down hard for sure

Good shit bro. The large airspace is the only reason I don't know if it'll do 150. We'll see when it's done

 

[CertifiedHoodClassic]

Got the roof done. I have been messing with my speakers to dial them in. Here's the measurement of the subwoofers. It's low level (so the RTA mic doesn't break), so not indicative of SPL at full tilt, however it shows the frequency response. It peaks at 40hz. plays very nice and flat over the entire bass range.