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View Full Version : 3 8 inch Subwoofer enclosure!! Hlp please?



David.lee
02-16-2014, 11:39 PM
Hey guys I just purchased 3 infinity Reference 860w 8inch subwoofers. I want to do build this box by my self so i need help! this is my first build so i would appreciate help. Would you guys go sealed or vented? Also, could you help me build it? i have winisd and i have the specifications entered but i don't know what to do from there. I would appreciate all help thank you! Here are some specs and a link to the manual.

Car is Its a 2004 honda civic coupe, i have a lanzar opti2000d. Trunk space i want to work with is 36(w)x 14(h)x 32(l) max.

http://us.akg.com/tl_files/catalog//Infinity/Infinity-Car/Specsheets/Reference/Reference/860w/860W_PI_EN.pdf

THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE: REVC (OHMS) . . . . . . 3.30
VOICE COIL INDUCTANCE@ 1 KHZ: LEVC (MH) . . . . . . . 2.31
DRIVER RADIATING AREA: SD (IN2) . . . . . . . . 33.17
SD (M2) . . . . . . . 214.00
MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 12.56
COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . 0.54
VAS (LITERS) . . . . . 15.23
SUSPENSION COMPLIANCE: CMS (ÁM/N) . . . . 232.70
MOVINGMASS, AIR LOAD: M MS(GRAMS). . . . 124.20
MOVINGMASS, DIAPHRAGM: MMD (GRAMS) . . . 122.40
FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 29.60
MECHANICAL Q: QMS . . . . . . . . . . . 6.10
ELECTRICAL Q: QES. . . . . . . . . . . 0.483
TOTAL Q: QTS . . . . . . . . . . . . 0.45
MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . .0.315
HAG (MM) . . . . . . . . 8.00
VOICE COIL HEIGHT: HVC (IN) .. . . . . . . . . 1.34
HVC (MM) . . . . . . . . . . . 34
MAXIMUM EXCURSION: XMAX (IN) . . . . . . . 0.513
XMAX (MM) . . . . . . 13.00

brian502
02-17-2014, 12:04 AM
Vehicle? Dimensions of trunk?

David.lee
02-17-2014, 01:06 AM
Im sorry i should have mentioned that! Ill edit the info in... Its a 2004 honda civic coupe, i have a lanzar opti2000d. Trunk space i want to work with is 36(w)x 14(h)x 32(l) max. Thanks for the reply brian! Much appreciated.

brian502
02-17-2014, 01:35 AM
no worries. being that those subs are SVC, i would definetly go with a sealed box. just sitting here playing with some numbers, 28x10x7 will get u to around 1.13cuft before displacement. those subs call for .35cuft per. hope this helps or atleast gives u starting point.

ThatChevyGuy
02-17-2014, 01:56 AM
no worries. being that those subs are SVC, i would definetly go with a sealed box.

Explain?

brian502
02-17-2014, 02:54 AM
david said he was sry for not metioning the vehicle and trunk dimensions, so i replied no worries

SVC= single voice coil on the sub. i would not recommend porting svc coil.

soundstreamer
02-17-2014, 06:38 AM
i would not recommend porting svc coil.

Explain?

David.lee
02-17-2014, 11:44 AM
Thank you brian! ill deffinatlly use that as one of my templates! And Guys, Does anybody else not recommend porting this box? Ive seen a few people port it and it sounds very good! they say it has Sq and its pretty loud for 8s. Another question is people also recommenced giving each 8 about .8-1 ft each, will this be a bad idea from users who have tried this? Last question is if i do go sealed, would going over the .35 recommended box size for each sub effect sq? Sorry for all of the questions and do really do appreciate you guys at the site.

globalminds_ent
02-17-2014, 11:50 AM
What does svc have to do with going ported or sealed? R

DB-Audio
02-17-2014, 12:22 PM
What does svc have to do with going ported or sealed? R

exactly what I was wondering I always thought it had to do with the fs and xmax

brian502
02-17-2014, 01:24 PM
I've always sealed svc subs and ported dvc subs. It's just ones opinion, and had no problem doing it this way. Apparently u guys have and there's nothing wrong with that either, if it worked.

1stgen
02-17-2014, 02:12 PM
the coils have nothing to do with ported or sealed.


you should go ported, .75ft each so 2.25 NET with a 4" aero port or 18-22 sq inches port area slot port

David.lee
02-18-2014, 02:48 AM
I think i may end up going the ported way, it should still have the SQ, itll be louder, and will hopefully hit some lower freqs. Ive seen the aero ports everywhere and think i may use it on this build! Does anybody elese think 1stgen's idea "ported... .75 each... 2.25 NET... with a 4" aero" will be a good box for these subs? again thanks to you all.

DB-Audio
02-18-2014, 06:01 AM
I've always sealed svc subs and ported dvc subs. It's just ones opinion, and had no problem doing it this way. Apparently u guys have and there's nothing wrong with that either, if it worked.

your way is not necessarily wrong but dont think its because of the coils more of a personal preference

David.lee
02-22-2014, 11:06 PM
https://drive.google.com/file/d/0B4btaowumBJFVjJpYUtmcnlYenc/edit?usp=sharing

https://drive.google.com/file/d/0B4btaowumBJFSzZlbVlHOUkzRU0/edit?usp=sharing

WOuld this be a decent basic box for these three subs? thanks again guys

snyderd758
02-23-2014, 12:49 PM
Your links aren't working for some reason. At 2.25ft3 a 4 inch precision port needs to be. 10.90inches to tune to 33hz this displaces about .08 ft3. I can't find a displacement anywhere let's say there about average so .03 per driver so .09 for all three. To get 2.25 you need to build an enclosure with a gross volume( before all displacements) of 2.42 ft3 that's without bracing.

The easiest way to do it is download Torres box calculator.

David.lee
02-28-2014, 12:28 AM
Hey guys! Really hate to bother again, just want to make sure i do this right the first time and to make sure i dont waste my time and money. Would you mind checking it out? Im building this weekend and will post it when im done! I have sketched the box on Google Sketch up. In the link is a sketch up, The box specs in Torres, and the output levels in WIN ISD. please tell me what you think? thanks so much.


https://drive.google.com/folderview?id=0B4btaowumBJFVnFtZDZTWTNpVjA&usp=sharing

brian84corvette
02-28-2014, 12:53 AM
port on the same side as the subs ?

David.lee
02-28-2014, 01:33 AM
Hi brian, is this something you would not recommend? My thought was, if i faced it with the woofers, it could use the trunk area as a small box to amplify the sound. Also i cant really put it on the sides or the top, because it will be firing into a wall. Should i face it backwords?

tommydh
02-28-2014, 01:59 AM
I personally would go larger sealed to obtain the SQ your looking for. I would look for a free download for torred tuner It is a much better tool than the RE Calculator. It allows for extra baffles, bracing, sub displacement etc.For first build I would go sealed go larger if desired if you dont like go with arrow ports

David.lee
02-28-2014, 02:18 AM
tommy, what volume did you have in mind? im open to all sugestions im new to the game and want to learn. And hello to a fellow Marylander!

snyderd758
02-28-2014, 10:02 PM
I pm'ed you back after looking at your Torres screen shot I would go with 2 4 inch precision ports only problem is your going to have to make the ports roughly twice as long and make the box bigger to compensate for the added port displacement.