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Two Tezla 8s in a 4th order for a Mega Cab

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
Customer brought these 8s to me and wanted an enclosure. The size of these meant that they wouldn't fit in an enclosure behind the rear seat. We even pulled the storage boxes/factory sub trying to get them to fit. No luck.

Customer said if I'd build a box to sit on seat he'd be happy with it.

Built this.

The entire dash moves. :laughing:

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Poopyface

Huh?
Joined
Jun 8, 2020
Member Number
1904
Messages
693
Location
Earth
A buddy I grew up with was lazy as fuck and wanted two 12's in his quad cab Ram. They didn't fit so he just put the big ass box on the back seat with wires running all over. Stayed that way for years and probably still is like that.

I tried my best to avoid riding with him cuz he played Britney Spears at full blast. :homer:
 

crispins

nothin
Joined
May 21, 2020
Member Number
846
Messages
1,373
Location
Pigeon Forge, TN
4th blowing through the rear deck with my pair of 8" ZVX's on 2k watts is what I want you to build for me.

I will be dropping it off to you this winter.

Looking forward to your work.
 

bdkw1

Well-known member
Joined
May 19, 2020
Member Number
354
Messages
624
A, whats it tuned for?
B, any port noise?
 

Beast

Fuckin eh.
Joined
May 20, 2020
Member Number
633
Messages
102
Location
Mission, BC
Damnit. Saw "Mega Cab" in the title and got all excited, hoping it was something I could copy for mine.:laughing:

Awesome work as always though!
 

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
Soooo how brutally loud is this one?:laughing:

It's not ripping his vehicle apart. :laughing:

The entire dash moves, though. A little windshield flex. Everything in/on the center console rattles around.

This Mega Cab is built better than that Civic 4-door. :laughing:
 

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
4th blowing through the rear deck with my pair of 8" ZVX's on 2k watts is what I want you to build for me.

I will be dropping it off to you this winter.

Looking forward to your work.

You don't want to use better subs? Looking at 8s due to space concerns? What vehicle?

Two of these in a 4th would be...fun. :laughing:
 

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
A, whats it tuned for?
B, any port noise?

It's a 4th order bandpass. The sealed chamber controls how low it plays, the vented chamber controls how high it'll play. So the sealed side works like a high-pass filter, the vented side works as a low-pass filter.

The ratio between the sealed/vented sides (and tuning of the vented chamber) controls bandwidth.
 

crispins

nothin
Joined
May 21, 2020
Member Number
846
Messages
1,373
Location
Pigeon Forge, TN
You don't want to use better subs? Looking at 8s due to space concerns? What vehicle?

Two of these in a 4th would be...fun. :laughing:

Well I own them already.

i had them in a crew cab in a nice box a local builder made for me and it was more than I needed, on 2k watts with a 320 amp alternator

Current car is Lexus GS, want them in trunk firing up through factory subwoofer area.

I am currently running 3 amp and a Dayton 4x8 DSP - I want that tuned by you as well.

A 4th with those ZVX's is pretty big so not really saving much space but I do like having most of my trunk plus I have a 5 gallon tank for my air ride in there as well.
 

TrikeKid

Junk Hoarder
Joined
May 19, 2020
Member Number
246
Messages
965
Location
Auburn, WA
Customer said if I'd build a box to sit on seat he'd be happy with it.

So, speaking of dumb truck box ideas, ever built one where the box replaced the rear seat frame instead of a seat lift? I have an SD3-10 in an under-seat box I built in my '06 F150 now but I've got a pair of SA-8's just sitting here. I'm considering building a new under seat box and bolting/magnet mounting the bottom seat cushions directly to the box instead of using a seat lift and having to work around the seat frame.
 

Mud Rod

Active member
Joined
May 21, 2020
Member Number
1091
Messages
29
Location
Palmdale
Since you are here, what happened to the pics in the "Stealth Build: Escalade 2nd Row Center Subwoofer Console" thread? I can't see them.
 

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
Well I own them already.

i had them in a crew cab in a nice box a local builder made for me and it was more than I needed, on 2k watts with a 320 amp alternator

Current car is Lexus GS, want them in trunk firing up through factory subwoofer area.

I am currently running 3 amp and a Dayton 4x8 DSP - I want that tuned by you as well.

A 4th with those ZVX's is pretty big so not really saving much space but I do like having most of my trunk plus I have a 5 gallon tank for my air ride in there as well.

Makes sense. I did a 4th for a pair of SDR-8s in a Jeep Wrangler not too long ago. Ended up being a reverse-ratio 4th. Needed a good bit of air space for those as well.
 
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ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
So, speaking of dumb truck box ideas, ever built one where the box replaced the rear seat frame instead of a seat lift? I have an SD3-10 in an under-seat box I built in my '06 F150 now but I've got a pair of SA-8's just sitting here. I'm considering building a new under seat box and bolting/magnet mounting the bottom seat cushions directly to the box instead of using a seat lift and having to work around the seat frame.

I had a guy here today...no rear seat in his truck and he had two 15s in Q-bomb boxes. Complained about lack of output. That was a result of the enclosure tuning. The lows he wanted the subs just couldn't make in those enclosures.

Since the rear seat was gone he said I could take up the space where the rear seat was. Older 4-door GMC

I did.

The rear wall of the cab flaps violently when playing 21 Hz. Lots of rattles in that truck.

He came today for tuning. Messed with it outside in the driveway. Daughter said stuff in the house was shaking.
 

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
Double stack must make for high xmax numbers. Can't say I really understand the rubber boots on magnets. Thermal dissipation doesn't suffer from them, you think?

Rubber boots keep the ferrite from being damaged if the sub is mishandled.

Other than that I've got nothing.
 

Merkkury

Lurker
Joined
May 20, 2020
Member Number
603
Messages
38
Since you are here, what happened to the pics in the "Stealth Build: Escalade 2nd Row Center Subwoofer Console" thread? I can't see them.

I can't see the pics in that build thread either. I use Firefox, it works in Chrome though.
 

ProjectTwin

Red Skull Member
Joined
May 22, 2020
Member Number
1193
Messages
401
Well I own them already.

i had them in a crew cab in a nice box a local builder made for me and it was more than I needed, on 2k watts with a 320 amp alternator

Current car is Lexus GS, want them in trunk firing up through factory subwoofer area.

I am currently running 3 amp and a Dayton 4x8 DSP - I want that tuned by you as well.

A 4th with those ZVX's is pretty big so not really saving much space but I do like having most of my trunk plus I have a 5 gallon tank for my air ride in there as well.

Just modeled a 4th for those.

It's a reverse ratio. About 4ft^3 total. From 72 Hz down it has more output than their suggested vented enclosure.

Ignore the 2.5ft^3 @ 36 Hz you see here. That's their suggested vented enclosure. I have to model the bandpass first, then model sealed or vented to see predicted SPL.

Still waiting on the SPL response fix for the bandpass enclosures.

Screenshot (429).png
 

ArTi54N

YouTubeR
Joined
May 26, 2020
Member Number
1511
Messages
1,082
Location
Las Tiendas Ranch, Webb County, Texas
one of the things I was known for doing.. was removing the bottom part of a rear seat, and making a box that either used almost all the space and just some covers, or leaving a small amount of room (compared to the original seat bottom) and placing a small cushion for who ever is stuck sitting back there.. haha

stock seats take up way too much room sometimes..

but like I said in a different thread.. its been about 8 years or so, since I have installed a deck.. and I just help out with design ideas, etc.. every few months.. for both enclosures and amp racks..

oh and I'm really good with fiberglass.. I was in an accident a few weeks ago, and Im thinkin of making a video of me sorta fixing the small amount of damage..
 
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