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Twin Sundown SA6.5 SW D2 32Hz Ported 0.6ft3 in Ford Escape Box Build

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It's hard to approximate cabin gain in Winisd but the Linkwitz-transform filter function can be used to "estimate" and I mean roughly estimate it. The 32hz tune looks like it's peaking around 30hz to me that way but again its gonna sacrifice output. They're only 6.5's so don't expect too much but they WILL dig. But its FAR below fs again... idk... you might be pleased.

I'm out... good luck.


JVC KD-X350BTS, FI Bl-18v3d2, Deaf Bonce AAK 4000.1, RF 500s, Polk DB comps, Cache Preamp/EQ250A Ces

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It's hard to approximate cabin gain in Winisd but the Linkwitz-transform filter function can be used to "estimate" and I mean roughly estimate it. The 32hz tune looks like it's peaking around 30hz to me that way but again its gonna sacrifice output. They're only 6.5's so don't expect too much but they WILL dig. But its FAR below fs again... idk... you might be pleased.

I'm out... good luck.

 

Dude you have BBP, you should stop using Winisd, its literally useless below 50hz because it can't predict cabin gain.

 

 

There's no doubt the 6.5s can play low, the problem is their sound quality goes down the shitter, it will be boomy and lack crisp transient response, which is the whole purpose of SQ. Those are the wrong subs for this build imo.


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Dude you have BBP, you should stop using Winisd, its literally useless below 50hz because it can't predict cabin gain.

 

Im on the road to learning it... lol... long road too. It'll just click soon I'm sure but now im still hitting alot of frustration as its the same basic thing but all functions are in a different layout. I just gotta find em all. I might just drop $20 on a manual unless I find a vid this week or it clicks.


JVC KD-X350BTS, FI Bl-18v3d2, Deaf Bonce AAK 4000.1, RF 500s, Polk DB comps, Cache Preamp/EQ250A Ces

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I think this build would be a great candidate for a passive radiator. No complicated ports to worry about, all you need to do is tune the radiator to the desired tuning freq.


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Im on the road to learning it... lol... long road too. It'll just click soon I'm sure but now im still hitting alot of frustration as its the same basic thing but all functions are in a different layout. I just gotta find em all. I might just drop $20 on a manual unless I find a vid this week or it clicks.

 

To me its very similar to winisd though not as efficient of a user interface. I read the manual first then went back and started using it no problem.


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It's hard to approximate cabin gain in Winisd but the Linkwitz-transform filter function can be used to "estimate" and I mean roughly estimate it. The 32hz tune looks like it's peaking around 30hz to me that way but again its gonna sacrifice output. They're only 6.5's so don't expect too much but they WILL dig. But its FAR below fs again... idk... you might be pleased.

I'm out... good luck.

 

I not expecting car shaking bass, maybe a little rear view mirror shaking. Ill try it at 40Hz like your model says is best, if its not good enough I can just extend the port with a board on the inside. Maybe Ill do the round port partially in the box and coming out under the seat, that way I can play around with it. If I do it under the seat I wont have a hole for my boys to fill with toys, food, trash and boogers.

 

Would I be better served by a single SA10 in this box sealed? If Im going for SQ with a little rear view shaking on 450ish watts?


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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if you want me to design it i can

 

---------- Post added at 11:30 AM ---------- Previous post was at 11:30 AM ----------

 

i'd actually like to, i need some smaller woofer practice


buck.box.designs@gmail.com

I help with full system support, if you need advice

:yumyum: I just like making people happy :yumyum:

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if you want me to design it i can

 

---------- Post added at 11:30 AM ---------- Previous post was at 11:30 AM ----------

 

i'd actually like to, i need some smaller woofer practice

 

Fine by me, if you want to practice anyway, Id appreciate it. The main issue is space requirements, so I cant just have a rectangular cube I have to use that odd shape on the ends. Right now Im trying to consider if it should be a sundown sealed 10 over the twin 6.5 ported. They take the same space requirements, but the 10 requires more watts, the SA8 wont fit since its deeper than the 10.


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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hit me up if you need me to design or would like to see what i come up with


buck.box.designs@gmail.com

I help with full system support, if you need advice

:yumyum: I just like making people happy :yumyum:

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hit me up if you need me to design or would like to see what i come up with

 

Please go ahead, Id love to see what you come up with.


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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According to bass box pro a pair of those 6.5s only need about .38-.4cf tuned around 40hz to model pretty flat. You'll have decent extension into the mid 30s, don't expect anything below about 35hz. The higher you go above .4cf the more under damped the design will be and the more peaky the response will be. So smaller is better in this instance which is good because of the limited space. The hard part will be adapting a port. I still think a passive radiator would work best.


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Got most of the cabinet built, need to cut the slot port and install the port board and baffle, but its coming together pretty good.

 


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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According to bass box pro a pair of those 6.5s only need about .38-.4cf tuned around 40hz to model pretty flat. You'll have decent extension into the mid 30s, don't expect anything below about 35hz. The higher you go above .4cf the more under damped the design will be and the more peaky the response will be. So smaller is better in this instance which is good because of the limited space. The hard part will be adapting a port. I still think a passive radiator would work best.

 

Ive never had a box with a passive radiator, Im really unfamiliar with it. As far as box volume goes, my first try will be around 0.6cuft net and I can move the baffle in and see where that gets me. 0.4cuft is really small for anything including 6.5s, Id love to see a graph of that modeled output vs a 0.6 or 0.7cuft box.


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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Ive never had a box with a passive radiator, Im really unfamiliar with it. As far as box volume goes, my first try will be around 0.6cuft net and I can move the baffle in and see where that gets me. 0.4cuft is really small for anything including 6.5s, Id love to see a graph of that modeled output vs a 0.6 or 0.7cuft box.

 

Passive radiators are very easy to work with. Its basically the top half of a subwoofer with no magnet. All you do is add weight to tune them. You get the benefits of a ported box and the space saving of a sealed box. A 10inch pr would be perfect for your build. I can post graphs of the .4 ported when I get home from work this evening.


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Passive radiators are very easy to work with. Its basically the top half of a subwoofer with no magnet. All you do is add weight to tune them. You get the benefits of a ported box and the space saving of a sealed box. A 10inch pr would be perfect for your build. I can post graphs of the .4 ported when I get home from work this evening.

 

Ive seen a kicker setup with a prebuilt box like this and actually considered it because it fit in my space. I decided to go this route because I could fit 2 drivers instead of one. If that graph of the 0.4cuft box looks good, maybe Ill save space in the baffle to add a 3rd 6.5 in the line up. Itll be easy to add physically, but Im not 100% sure how Id wire them to get between a 2-4ohm load at the amp.


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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I went with a Tline for a pair of these. I haven't installed yet so I can't give you impression at the moment.


2006 Dodge Ram 2500 Mega Cab 4x4

HU: CD7200MKII

Front Stage: SI TM25/ID X-69

Front Stage Amp: PG Ti21000.4

Sub Stage: Sundown SD-3 12 x2 (soon to be 3 SA-8v3s in a CSCStang TLine)

Sub Stage Amp: PG Ti22000.1

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Just got the shipping notification from sundown, subs should be here 5/29. I can almost hear them now...


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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Ive never had a box with a passive radiator, Im really unfamiliar with it. As far as box volume goes, my first try will be around 0.6cuft net and I can move the baffle in and see where that gets me. 0.4cuft is really small for anything including 6.5s, Id love to see a graph of that modeled output vs a 0.6 or 0.7cuft box.

 

 

Blue Line is .6cf @ 32hz - Sundown Recommended

Red Line is .4cf @ 40hz

Yellow Line is .3cf @ 38hz

 

450w of power

 

A 2 inch round port was used and when you see the vent velocity you will see that it's not enough, ideal vent velocity should be below 35 m/s. You'll notice the lines darken when they go beyond this point. Going up to a larger port size will need a crazy long length like at least 2 feet most likely. This is why I was suggesting a passive radiator.

 

Group delay on the blue line peaks at 28ms at ~28hz. Higher group delay = more sloppy and boomy sounding

 

Yellow line is the most SQ friendly imo

 

Red is a compromise of sacrificing what little low end there is to gain more SPL in the 40-60hz area and would sound the loudest in car.

 

 

uEWmP9A.png

 

https://imgur.com/uEWmP9A


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Passive radiators are fairly easy and cab be tuned if they offer that. It's still largely the same as ported, it's a delay radiating surface that's shifts the phase of the rear wave of the woofer like a regular port does. I know in high power applications, PR's fade out because of mechanical limits. Just check the linearity of the cone movement when it moves and look at the Sd and xmax for total air moved in a stroke.

 

I've had situations where guys just keep adding PR's and keep gaining because their woofers are so powerful. 6.5's should be fine, though. You could probably make it sound pretty good.

 

I think you should consider a series 6th order bandpass.


buck.box.designs@gmail.com

I help with full system support, if you need advice

:yumyum: I just like making people happy :yumyum:

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Blue Line is .6cf @ 32hz - Sundown Recommended

Red Line is .4cf @ 40hz

Yellow Line is .3cf @ 38hz

 

450w of power

 

A 2 inch round port was used and when you see the vent velocity you will see that it's not enough, ideal vent velocity should be below 35 m/s. You'll notice the lines darken when they go beyond this point. Going up to a larger port size will need a crazy long length like at least 2 feet most likely. This is why I was suggesting a passive radiator.

 

Group delay on the blue line peaks at 28ms at ~28hz. Higher group delay = more sloppy and boomy sounding

 

Yellow line is the most SQ friendly imo

 

Red is a compromise of sacrificing what little low end there is to gain more SPL in the 40-60hz area and would sound the loudest in car.

 

 

uEWmP9A.png

 

https://imgur.com/uEWmP9A

 

Thank you for doing those graphs. Is it possible to see 0.6 and 0.7cuft at 40Hz?

 

I already finished most of the cabinet and I dont think I could move the baffle up high enough to make it 0.3 or 0.4cuft. It narrows towards the top so I run out of room for the driver before I get down to 0.3 or 0.4cuft. Also I was planning on my slot vent being 1”x8” which is 4cuin per driver. I think the 2” round port is too small so thats probably why the velocity is super high.


02' Ford Escape

Big 4 with 0 gauge welding cable with ground to alt case, block, chassis, and body.

Pioneer FH-P8000BT HU

Focal PS165 active with amp crossover in stock locations of front doors and sail panels

Alpine PDX-V9 under seat

http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/626881-2002-ford-escape-professional-amateur-build.html

http://www.caraudio.com/forums/enclosure-design-construction-help/636900-twin-sundown-sa6-5-sw-d2-32hz-ported-0-6ft3-ford-escape-box-build.html#post8959443

Bought from: Rysandro Sold to: LuvSQ

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