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  #1  
Old 08-28-2011, 07:30 PM
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Default design request for sthrnbumpn [Completed]

Design request for sthrnbumpn

Subwoofer/speaker brand: RF

Subwoofer/speaker model, size, and number of woofers: HE2 8" 2

Expected power handling:300 rms per sub

Vehicle enclosure will be used in (please add notes if specific or unusual placement will be used): 2008 Dodge Grand Caravan, it will be placed in the back hatch,

Max dimensions (MUST fit in vehicle or through trunk opening!):
Amp or expected power handling:48x50x28

Listening expectations (description):the whole family has a wide variety we listen too, hardcore rap/metal, teen girl pop, R/B,

What bandwidth is acceptable? 35-60hz high output, 30-80hz? Ignore if you do not understand
ive tried a few different boxes in this app, an never liked the results, no low end at all it seemed like, it was missing all together in the van,

How low do you want it to play and how important are the low notes (Song examples are encouraged)? lows would be great, im not looking for high powered lows, as i have no subsonic filter on my amp, id like to keep it under 40 hz if possible, but what ever you recommend , im liking the sundown 8 box you designed, an the t-line AB 8 i seen too

Are you looking for a heavy low end, or one that blends with the rest of the output? that would be great

How important is sound quality compared to loudness? im hoping these 8's have a good clean, tight sound to them, being that what i paid for them im just hoping for the best

Are you able to cut odd angles? (45*, 7*..) yes

Is this an SPL design? If so, what is your peak frequency? If you do not know this, please measure your average cabin length in inches! 130"

Any specific enclosure preferences (Double baffled, flush mount, center slot, blowthrough, home environment etc)?

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  #2  
Old 08-28-2011, 08:10 PM
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Thankyou for filling out a request! I am wanting to do a t-line for this as the enclosure should provide good quick response for things like metal, with good low end extension as well as over all tonality.

The only thing is 300 per sub may be enough to push them past excursion down low. We could combat this by keeping excursion in-check past the expected passband, but this leads to good and bad:

Good - Possible extension below 30hz, due to effectively tuning very low to keep excursion in check and 'loaded'

Bad - Low tuning requires long line length, large box. Leads to less output overall.

Taking a look at your cabin size shows potential for good gain, particularly around 30/60hz. I should be able to model these soon and let you know what I find.
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Old 08-28-2011, 08:53 PM
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awesome info surreal !!

when you say less output, how bad could it wind up being?

cant wait for your final thoughts,
the subs should show up tomorrow, an i need to pick up sum more material, but other than that, this will be my first actual build log ill be doing
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Old 08-28-2011, 10:21 PM
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Well, so far this proves to be interesting. Rockford only has a few of the T/S specs posted..
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Old 08-28-2011, 10:24 PM
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does this help?
Rockford Fosgate HE2 RFP4108 8" Dual 2-ohm Voice Coil Component Subwoofer - Features & Specs at Crutchfield.com
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Old 08-28-2011, 10:28 PM
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one more pdf link

http://www.rockfordfosgate.com/rftec...oofers_MAN.pdf
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Old 08-28-2011, 10:42 PM
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Already found those, but thanks.

QTS is derived from QMS and QES.. which you can get QTS, but cant get the others from QTS alone..

I believe Ive found something that will work well. It gives a slight peak at the low end but nothing that should be over bearing. Keeps excursion in check to at least 28hz so you should be fine on most all music.

Ill update the thread once it has been drawn.
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sthrnbumpn (08-28-2011)
  #8  
Old 08-28-2011, 11:19 PM
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Design is being uploaded at the moment.

Design has been completed and can be found/purchased here: 2xHE8s Transmission line enclosure - $25.00 : TheBoxHouse, Enclosure designs

Should be an awesome little build!
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Last edited by surreal; 08-28-2011 at 11:26 PM.
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  #9  
Old 08-29-2011, 06:03 AM
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thanx surreal, im ordering it now,
as soon as i figure out how to get it back down to one item on my checkout acct,
i got 2 items sumhow
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Old 08-29-2011, 08:53 AM
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Thats weird, I have it set to default to 1 and you are unable to change quantity.
Let me know if you cant figure it out, or try clearing the cart? If not, I can delete your account so it can be recreated. Ive yet to have this issue, sorry!
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Last edited by surreal; 08-29-2011 at 08:58 AM.
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