Again I am not trying to step on anyones toes and realize we have a great audiophile member here, I am just adding info to help others out.
I will start with a bit of back ground, I have been an audio geek all my life one way or another, probably why I still own a successful nightclub
. I have had many audio show cars in the past, so when it comes to proper sounding vehicles I can lead you in the right direction.
First things first I will answer some questions and debunk some myths about proper BASS and sub enclosures in cars. There is really only 3 types of subs you can get for a car that are anything worth buying.
1-Powered sub box, to get any decent BASS response the box size will be quite big, for all intent and purpose to fit in a 430 you need relatively small enclosure, they sound OK and add depth but they are not earth shattering, you get what you pay for.
2-Ported non powered sub box enclosure, these are usually bigger in size as they need the cubic space to create the low end sound vis a port. They are good as in creating really deep BASS but you give up on quality as most suffer from free flow wows, these units are usually the ones in your neighbors kids Civic booming down the road with horrible horrible BASS.
3-Sealed non powered sub enclosure, these can operate in half the space of a ported unit but need more power to run efficiently. Up side is you get the best sounding BASS (imo) that tight velvet hammer THUMP that hits you n the back of the neck and snaps it off
If you are leaning toward a powered sub woofer that will easily fit in your 360/430 these are my recommendations.
Kenwood KSC-SW11 $250 I would recommend 2 Kenwood KSC-SW11 Compact powered subwoofer at Crutchfield.com
I have one of these to fill the BASS in my Lambo, it does an OK job adding bottom end but nothing fantastic.
Blaupunkt Blue Magic XLf 200 A 300-Watt 8-Inch Low Profile $210 again you will need 2 Amazon.com: Blaupunkt Blue Magic XLf 200 A 300-Watt 8-Inch Low Profile Active Subwoofer System: Car Electronics
I have not had personal experience with this unit but reviews from different sources are decent, again you get what you pay for.
Rockville RW8CA 8" $120 again you will need 2 Rockville RW8CA 8" 600 Watt LOW Profile Under Seat Active Powered CAR Subwoofer | eBay
I have no personal experience with this model but again reviews are good on it
Lets be clear, if you want HUGE BASS then get a custom enclosure done with 2 10" woofers/drivers that is the best sounding by far. But if you like to do the work and install yourself and have excellent BASS then read on as this is for you.
I LIKE BOTTOM VERY VERY TOIGHT LIKE A TIGER BOTTOM END that is
So for me the sealed unit was the only choice, but space is at a premium inside a Ferrari especially with the BOSE speaker system which gives you 4 speakers behind the seat taking up a bit of room. In my search for a subwoofer I had 3 criteria to meet, one it must sound good, two it must look as close to stock as possible without me doing any modifications, three it had to fit in a tiny space behind the seats.
These were my dimensions I had to work with, 9.5" high by 7"deep by 16"wide, this was almost an impossible task to find decent sub to fit in that space, I was positive I would never find on and was leaning toward the powered subwoofer, but all my hard effort and searching the web for days on end I found these. They are from Kicker a very reputable audio BASS company in US.
Kicker 40TCWRT84 4ohm 8" sealed units, $230 you will need 2 for sure and an amplifier of decent quality $550, so for just over A $1000 with tax's, yes more expensive but worth it trust me. Kicker 40TCWRT84 Sealed truck enclosure with one 8" CompRT subwoofer at Crutchfield.com
If you do your homework you will notice there are 2 types of these speakers, a 2ohm and a 4ohm. I recommend getting the 4ohm as you will need a pair running them parallel making them 2ohm anyways, so you can use a 2ohm or 4ohm amp. A 2ohm amp runs more efficiently, a 4ohm has to work a little harder thats all.
Here is specs on the Kickers
•sealed enclosure with one 8" CompRT subwoofer
•3/4" medium-density fiberboard construction covered with carpet
•4-ohm total impedance
•power handling: 100-400 watts RMS (800 watts peak power)
•frequency response: 30-500 Hz
•sensitivity: 86 dB
•9-1/8"W x 16-1/4"H x 5-3/8"D1 x 4-1/2"D2 - LOOK AT THE DIMENSIONS THEY ARE A PERFECT FIT
•warranty: 1 year
•60-day money-back guarantee
When buying an amp please make sure you match the performance of the speaker.
These run 100-300RMS, do not get this confused with Peak handling power. This is where most ppl make mistakes by getting either to low or way to high wattage for the speaker creating basically mid range. RMS means what the subwoofer needs constantly to operate most efficiently, so you look for an amp that has 200-300RMS this is where the amp is comfortable at running smooth all day long. The Kickers peak power is 800watts, this is the thresh-hold of what it can handle at full power and peaks, anything beyond that and destruction will likely occur. Some ppl will say to get an amp slightly above peak power say 1000 watts, I disagree as you do not need it, when you reach the handling capacity of the speaker you also reach the sound quality and distortion occurs. Get something evenly matched and a decent amp don't cheap out on it.
I chose this little monster the SOUNDSTREAM RFM700.1D REFERENCE SERIES MONO BLOCK MICRO AMPLIFIER it runs 300-400RMS all day long and has peak output of 700watts at 2 ohm. , $500 comes with built in crossover which makes it easy to adjust to your type of music style, as well as a remote BASS volume adjust which I use constantly as sometimes you want BASS other times you don't. Soundstream RFM700 1D Reference Series Mono Block Micro Amplifier CAR Audio AMP | eBay
It is a very small unit fits behind the lower part of the passenger seat.
Please make sure you use proper wire guage, some ppl use way to small power and ground wire causing it to choke. Think of the amp as an athlete and the wire guage as it's oxygen, the bigger the better to breath with and run efficiently. You can buy wire harnesses anywhere.
OK it was finally time to hook these bad boys up, they fit behind the upper portion like a glove, perfect fit and size
These are wedge shaped so you can install them 2 ways in your Ferrari, either with script to the middle of visa versa with wire leads to the middle in that case you will see the speaker wire but it looks industrial cool.
Again these subs are not earth shattering but instead deliver rich low bottom end way better than any powered unit you could buy. It's not deep deep BASS but rather tight thumping BASS as it should be heard.
My first impression was WOW!!! you have to drive these guys a little hard to get the response you need, but once you figure out the sweet spot they sound great. It is more than ample BASS for me, it shakes the chair and rattles my ribs
sounds tight and complements all types of music but especially Rock or Jazz or Alternative.
Just want to add to make sure you play with the crossover on the amp and set the head-unit EQ to your liking, this will make all the difference in the world. On mine I have the head unit on EXCITE#1 subwoofer level set to 12 and the subwoofer loud ON. I found this was the best sound with deepest richest BASS that I could control to my liking with the control knob.
OK enough talk here are some pics showing the different positions in the car, and showing them behind the seat with amp so you can see the room there is to spare.