whats the minimum encloser for this sub?

Enclosure size effects how low a frequency the sub can produce, as does port size. There are many free programs like box-port design II that once you enter the speaker perimeters will show a graph of the expected low frequency curve. The important values are VAS=10.7L, Qes=1.015, Qts=.812, Fs=43Hz. The manufacture suggests a 1/2 cu ft sealed enclosure, and this yields an f3 about 50Hz with a 2db bump at 70Hz. Due to the high Fs frequency of this driver, a larger box only improves sound a small amount. Going smaller is a problem and will greatly hurt sound quality. This sub is excellent for general rock music, but electronic high bass rap music may not give you a super low bass punch that more expensive subs will. Also being only 8", there is just so much air that this piston can through. Due to the low efficiency of most subs, the dedicated sub amp should be about 10x the power of the main speakers.

Can i replace my factory sub in a 2008 ford expedition el with this one?

I wouldn't know if it fits you'll have to open the panel to see. Also verify that the factory amp has the right power to drive this woofer; if thats what you plan on using for power. My Dodge Nitro ended up being a dual voice coil so this woofer didn't work from me. Went with pioneer and had to put an aftermarket amp in also.

Can this be used with stock amplifier? I think its only 40W for the amp.

I do not think it would sound good with that amp.

Would this be better sealed or ported?

Absolutely SEALED. I originally engineered the enclosure with a port using a boxplot program for port size design. I even tried different frequency tuning with port size. You do get more extended bass from a ported enclosure, but the frequency curve is not as smooth. Think single note subwoofer, not the best for music. I ended up closing up the port and running an amp capable of providing adequate output. Speaker sounds great now. In short, NO PORT.

ASIN	B001ULS3DY
Age Range Description	Adult
Antenna Location	For music systems, home theaters, and personal computers
Audio Driver Size	8 Inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Audio output mode	Surround
Battery Average Life	12 Hours
Box Contents	KFC-XW800F
Brand	KENWOOD
Brand Name	KENWOOD
Colour	black
Compatible Devices	Car Audio System
Compatible with Vehicle Type	& SUVs, Select Cars, Truck
Connectivity Protocol	Bluetooth
Connectivity technology	Bluetooth
Control Method	Touch
Customer Reviews	4.2 out of 5 stars 83 Reviews
Enclosure Material	Aluminum
Frequency Response	35 Hz
Frequency response	35 Hz
Global Trade Identification Number	00019048183477
Impedance	4 Ohms
Input Voltage	120 Volts
Input voltage	120 Volts
Is Waterproof	False
Item Dimensions D x W x H	45.7D x 20.3W x 35.6H centimetres
Item Weight	2 Kilograms
MP3 player	No
Manufacturer	KENWOOD
Maximum Speaker Output Power (in watts)	300 Watts
Model Name	KFC XW800F
Model Number	KFC-XW800F
Mounting Type	Tabletop
Network Connectivity Technology	Bluetooth
Number of Audio Channels	1.0
Number of Batteries	1 12V batteries required.
Number of Items	1
Number of Power Levels	1
Power Source	Corded Electric
Product Features	Dolby Enabled
Speaker Size	8 Inches
Speaker Type	Subwoofer
Speaker maximum output power	300 Watts
Specific Uses For Product	For Vehicles
Subwoofer Connectivity Technology	Wireless
Subwoofer Speaker Diameter	8 Inches
Tweeter Diameter	1 Inches
UPC	613815579663 019048183477
Warranty Type	Limited
Wireless Technology Type	Bluetooth
Woofer Driver Diameter	8 Inches

Kenwood KFCXW800F eXcelon 8" Shallow Subwoofer

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