[kolyani4]

Hello to all, i"m here about a 2 days, reading all post that regards to subwoofers
i"m planing to add a subwoofer to my bedroom ( about 3 x 4 meters ).
what i have for now:
2 x Wharfedale Athlantic 400SE floor speakers
1 x Kenwood KRF-V5100 Receiver/Amplifier ( 6ohm version ) connected to PC via SDPIF to Realtek on-board soundcard.

for now, i want to add a subwoofer to my system.
i searched the Israel market, and found thats its no subwoofer for HT, only the cars one,
i bought KICKER C12 4 ohm subwoofer driver. and start reading its tech spec, i found that kicker recommends 35-99 liters box for sealed. i dont know realy what this mean, what is recommended size for it ?
and second thing im stuck in selection between do a DIY sealed box, or go to store and buy car sealed or ported box (about a 35-40 liters ) ?

the price of boxes in store are from 60$ for sealed/ported one 35-40 liters.
the carpenter wants about a 70-80$ for this (17mm MDF ) job excluding the assembling the box.


if i select to DIY box i decided to do a stealth box under my bed ( 200cm x 160 cm ) size of box whill be something like 18cm ( free space from top of underbed to floor -2cm ) x 60cm x 65cm. this will fit nice under my bed, but i dont know if this sound good and give me a good bass ?

3th thing that i don't know how to connect it to my amplifier in good way ?

1. connect it in parallel of the one (left or right channel )
2. connect it in series to one of the channel
3. buy Noname car 4 bridgeable channel amplifier power it from dedicated 400w PC power supply and connect it to subwoofer line out in kenwood amplifier ( pass thought, not any cut offs only mix lows from channels).

i think the "3" give a more options ( crossover, phase )

my prefers are music (70%, movies (20%) , games ( 10% )

sorry for my English i"m Russian from Israel

waiting for all answers.

 

[kolyani4]

Can you post the T/S parameters for the sub?

i found specification only on 2002 model but i think its same or almost same.

Model Comp 12
SPL 1W/1M 88.6dB
Displacement, cc 1718.6
Displacement, cu in 104.9
Hole cutout, in. dia. 10-15/16
Mounting Depth, in. 5-1/2
Revc 3.79 Ohms
Sd, SqM .0532
BL, TM 11.69
Vas, Liters 133.27
Vas, CuFt. 4.71
Mms, gms 107.37
Fs, Hz 25.8
Qms 11.298
Qes .499
Qts .478
Pmax, watts 150
Xmax, mm 7.5
Freq Response, Hz 27-500
Magnet weight, oz 44
Voice coil (Kapton), In.1-1/2
*Based on 4-Ohm models

found something else but not sure if its a C12 that i bougt becouse its has C12a marking.
T/S for C12A

 

[kolyani4]

There is a C series and a Comp series. Does your subwoofer have any markings that say C12 or Comp12?

its a COMP series. full name of it "KICKER COMP C12 4ohm subwoofer driver"

 

[kolyani4]

im using 2 of them on a big ported box......they get loud for only being 150w rms.......im saving up for a bash 300W or 500W plate amp..

....thanks to MIKE P...for the enclosure help

unfortunately i cant put big box, i don't have much space in my room.

 

[kolyani4]

mine is 11cuft.tuned to 22hz..its over 200 lbs......then go for a small box......mike will help you.....

yes, i see that kicker recemends box from 35 liters to 99.1 liter, box that i planed to but under my bed its a 49.9 liters ( designed in WinISD) but im not sure if its will be good if i put it under my bed.

 

[kolyani4]

The Kicker recommendations for box size are for car audio use, in a house it is different. I will model this later today when I get home from work. Can you place the sub in a corner of the room?
Is this measurement the external size of the box?

1. no i cant place it in corner, i only have space between my beb and my MDF closet (in corner of room ), where is my left speaker are, i can place sub behind the speaker. this place is almost corner ( behind mdf closet are end of the room ( i can take photo of my room if you like )
2. this measurement are outside of the box that winisd give me.

can you tell me if subwoofer under bed are good idea ?

ok, im waiting for you.

 

[kolyani4]

49 liters ported tuned to 24 hz would require a 4 inch diameter port 31 inches long. Modeling shows the box is too small for this sub and low end extension suffers. You may as well put the sub in a 49 liter sealed box.

ok, if all be good i will start the build after 3.10.09

what did you think about connecting it to amplifier, what is good. car amp or kenwood ?

 

[kolyani4]

if i put the DIY box under bed the Driver will be directet to the bed mattress, its ok ?

The usual connection is Kenwood LFE output - amplifier - subwoofer. I'm not sure if the SDPIF to Realtek will affect this or not. You will have to do some research.

ok, did a car amplifier will be good idea, if i power it up with dedicated computer power supply ? ( i have a 400watt Thermaltake PSU ).

what about to buy a car subwoofer sealed box ( about 35-40 liters ) it has trapezoidal box.

what thickness of MDF ( 17mm is normal ? ) i need for this sub ?

P.S. im 23 years old

 

[kolyani4]

find yourself a good plate amp that will deliver at least 150w [email protected] ohms...............
i found a bash 300w amp on craigslist for $60.00....i just got it today......... 300w rms @4 ohms..its like $150.00 it looks like it was never mounted on a enclosure cause it has 0 sratches....and the mounting holes are unmolested....

the problem is that i live in Israel, and second one that i live i very small city ( about 30000 peoples only )
and in radius of 50km i dont have any audio store that sell parts. becouse this i want to use car amplifier and pc power supply.

 

[kolyani4]

can anyone tell me if this box will good for me ?
i dont know what size of it, but i think its about 30-40 liters


i have to options to those, one is Closet and one is porter box, but what frequency on port tuning, i don't known.

 

[kolyani4]

Without knowing what the net volume of the box is and the tuning frequency, it's impossible to predict.

the volume of box about 30-40 liters. but what is tuning frequency i dont know.
i readed the review of kicker C12 and its says that best closed box for it its about 32-35 liters. for flat response of frequency.

i leaved the idea of puting sub under my bed.

 

[kolyani4]

today my friend give me he's old box
i mesured it end found it that its a 51 liters and port tuning frequency is 29.5herz ( 10cm x 45cm )
did it will be good to put my kicker in this box ?

and he give me a car amplifier something from china ( warrenty ended in 2003 ) CONCORD 4720GT 700W
its has a 4 channel its can bright 2 channels, i think its have a 50-60W RMS for each channel, in brighe its will be a 100watt i think, its will be ok, no ?

 

[kolyani4]

Hopefully the amp has a high pass filter around 25 hz to protect the sub from bottoming out.

how i can check this ?
on input of its has a TL494cn.
and has 4 ic chips of TL074CN
and one KIA4558P chip.

its has cross over, low or high pass filter from 40-400hz.

 

[kolyani4]

It should say in the manual if the amp has a high pass filter and at what frequency.

i have no manual for it, i think its not have this filter.

 

[kolyani4]

can i check visualy if it has a highpass filter ( this is subsonic, right ? )
i checked the manual for kicker c12, its says that i can install c12 driver to ported box without subsonic filter, but power handling is 75watt maximum.

 

[kolyani4]

Thanks to all, today i received my kicker C12 , installed it in the box that i say, now its powers from kenwood HT amplifier, the bass are amazing ( for me ), later i will try to power it from car amplifier, i need to buy some cables

i will post some pics later.

 

[kolyani4]

nice to hear that.....

now its powered from the car amp ( powered by Thermaltake 400W PSU ) the sound are good, turned the crossover about a 200hz. now im thinking about buying another car amplifier. bacouse this is too old ( about 2002-2003 year )

i will post some pics later, i need to get memory card for my camera

 

[kolyani4]

try getting a class d amp with subsonic and all that...........

i dont know how to determine what class is it ?
im about to buy someting up to 150$
like this
http://www.lanzar.com/itempage.asp?model=VIBE211

did anyone know why 2 channel amps are more expensive that 4 channel ?

did the subsonic filter is important ?

 

[kolyani4]

this will be aperfect amp for your sub.....plus this is a clas d amp

http://cgi.ebay.com/Lanzar-VIBE7001...ewItemQQptZCar_Amplifiers?hash=item1c0c94eb52

Thanks, but this cant be shipped to israel i will try to search israel market.

 

[kolyani4]

that sucks......

yes i checked in israel the lowest price for mono amplifier (Lightning Audio B2.250.1 ) is 200$
and for Rockford P3001 its 230$, may be letter i will buy it. now im thinking about to get a coaxial cable from receiver to amplifier, becouse when i turn lights in my house from sub sounds low freqency CLICK, if i light up flurocent lamp its sound a few time until lamp light up completely .