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Old 5th August 2011, 06:40 PM   #1
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Question Sub box volume

My subwoofer is Kenwood KFC3012 and I use this sub for my home application

My box measurements are :
Width : 14 inch
Height : 14 inch
Depth : 14.5

and as I measured the volume of this box if I wasn't wrong is around 1.5 Cubic feet ( as the sub's manual )
Click the image to open in full size.

but It doesn't have a loud voice

does anyone have any idea about this sub and its best box????

a picture from this sub in its box

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Old 5th August 2011, 08:11 PM   #2
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This is a high Qt car audio 'one note' woofer, so even a 10x larger sealed cab won't help. It will do much better in a TL, but the trade-off will be a larger, more complex cab, so you up for making one, and if so, how large can you tolerate?

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Old 5th August 2011, 08:29 PM   #3
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What are you using to drive it?
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Old 5th August 2011, 09:32 PM   #4
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yet a 250W mosfet amp, but I'm building a 400W for it that has this characters:

POWER RATING at 1KHZ with 0.1* THD = 320W/ 8 ohm, 400W /4 ohm
IMD= *0.008*
THD at 160W into 8 ohm *1 KHZ= *0.005*
THD at 160W into 8 ohm *20 HZ....20 KHZ= *0.05*
FREQUENCE RESPONSE [at 160W/8ohm, *0...-3dB]= 1.5 HZ.....125 KHZ
INPUT SENSITIVITY= 1Vrms
ΙΝPUT IMPEDANCE= 48K
SLOW RATE with input filter= 20V/uS
=SIGNAL TO NOISE RATIO [at 1W/8ohm] *99dBA
= DAMPING FACTOR at 8ohm [15HZ...25KHZ] 196
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Old 5th August 2011, 09:42 PM   #5
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if the dimensions above are external you have ~1cf of volume.
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Old 5th August 2011, 09:56 PM   #6
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no they are the internal parameters
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Old 5th August 2011, 10:15 PM   #7
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What shall I do???
Do I have to change my woofer??
Do you know anything good?
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Old 5th August 2011, 10:34 PM   #8
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Test it. got an ohm meter? check that the VC resistance is 3.4 ohms. then check that the amp (attached to the driver) is putting out the voltage it should. at half power it should be delivering ~15V AC

Last edited by revboden; 5th August 2011 at 10:38 PM.
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Old 5th August 2011, 10:52 PM   #9
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Since you've mounted the Kenwood upside down, you may have to connect the positive wire to the negative terminal to have the music sound right-side up.
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Old 5th August 2011, 11:55 PM   #10
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Quote:
Originally Posted by bentoronto View Post
Since you've mounted the Kenwood upside down, you may have to connect the positive wire to the negative terminal to have the music sound right-side up.

Last edited by revboden; 5th August 2011 at 11:57 PM.
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