Foam

I have a Rockford Fosgate – Punch 12" Dual-Voice-Coil 4-Ohm Subwoofer
Model: P3D412 | SKU: 8266342
Handles up to 1000W peak power (500W RMS)
Die-cast aluminum basket and trim ring
KEVLAR®-reinforced cone (KEVLAR is a registered trademark of DuPont)
High-temp voice coil with spun lace Nomex insulating reinforcement collar
Extended excursion range tall profile surround
Venturi-effect center pole dispersion venting/cooling system
Spring-loaded connection terminal
High-density compressed half-roll sealed poly foam surround
Double-stacked 102 oz. magnet design
Sensitivity: 84dB
Impedance: 4 ohms

WITH THIS AMP:
Kenwood – 1000W Class D Bridgeable Mono Amplifier with Variable Crossover – Black/Blue
Model: KAC-8104D | SKU: 8696351
1000W peak output @ 4 ohms, bridged
500W peak output @ 2 ohms
300W peak output @ 4 ohms
500W RMS (continuous) x 1 @ 2 ohms
300W RMS (continuous) x 1 @ 2 ohms
Adjustable 50-200Hz low-pass crossover
40Hz bass boost circuit (+18 dB, variable)
Cooling fan for improved performance
Blue illumination

Like this – http://i81.photobucket.com/albums/j230/sparky3489/SINGLE-PARALLEL.jpg

More info here http://skrbox1.spaces.live.com

OK i just bought a sub this one ->http://www.bestbuy.com/site/olspage.jsp?skuId=8265717&type=product&id=1170289779897

Specs
Product Features
Handles up to 300W peak power (150W RMS)
Polypropylene woofer with parabolic, acrylic dust cap
High-temp voice coil with spun lace Nomex insulating reinforcement collar
Tear- and fatigue-resistant polycotton spider
Optimized motor magnetics with extended pole and bumped backplate
Spring-loaded connection terminal
High-density compressed half-roll sealed poly foam surround
Sensitivity: 85dB
Impedance: 4 ohms

and bought this wiring kit
20′ CRCA20 RCA cable
30′ 16-gauge speaker wire
20′ 8-gauge fused power wire
3′ 8-gauge ground wire
16′ 18-gauge turn on wire
4" wire ties
#10 gold-plated ring terminal
¼" gold-plated ring terminal
5/16" gold-plated ring terminal
3 rubber grommets

Amp Specs
amps bridagbel
Power Plus Series 2-Channel Class AB Car Amplifier
RMS Power Rating:
4 ohms: 65 watts x 2 chan.
2 ohms: 90 watts x 2 chan.
Bridged, 4 ohms: 170 watts x 1 chan.
Max power output: 105 watts x 2 chan.
LED power and protection indicators
Blue illuminated VU meter display
Tuned Bass EQ (0-12 dB bass boost at 45 Hz)
Bridgeable operation
Compact design
Encapsulated power and speaker terminals
Preamp RCA outputs
Short circuit, DC offset, thermal, and overload protection circuitry
Extruded aluminum alloy heatsink
Variable high-pass filter (40-400 Hz, 12 dB/octave)
Variable low-pass filter (40-240 Hz, 12 dB/octave)
CEA-2006 compliant amplifier
Frequency response: 10-60000 Hz
Dimensions: 10.5"L x 11.75"W x 2.5"H
8-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.
1-year Manufacturer’s warranty

Now I dont know weather or not to bridge the amp or realy what to do i have very basic knowledge of what to do i have a aftermarket deck so in your opinion how should i hook this up a diagram would be helpful

Definately bridge the amp, it will give u more bass. And if ur talking about starting from scratch, u gotta run the red power 8 gauge wire from ur battery or fuse box to the amp. From there u must connect the black 8 gauge grounding wire to a piece of raw metal on the car. what i mean by raw is that there is no paint getting int he way. Next run the RCA cords fromt he back of ur headunit (stereo) AND the amp turn on which will be a thin blue wire. Find where the amp turn on line is located in the wiring harness and attach that. Send both of those wires back to the amp and plug them in. From there just attach the positive and negative wires to the sub box and the amp and blast away.

I have one Lanzar OPTI1532D 15" 2600W 2-Ohm Subwoofer

* Sensitivity: 88 dB
* RMS Power Range : 1300 Watts
* Peak Power Handling: 2600 Watts
* Impedance: 2 Ohm
* Low Frequency response: 22 Hz
* High Frequency Response: 700 Hz
* Diameter: 15 Inch
* Custom Tooled Die-Cast Aluminum Basket
* Cloth Laminated Paper Cone Structure
* Hi-Excursion Foam Surround
* 4" High Temperature DualVoice Coil
* 165 Oz High Density Barium Ferrite Magnet
* Power Handling: 1300 Watts RMS /2600 Watts Peak
* Frequency Response: 22- 700 Hz
* Impedance (Per Coil): 2 Ohms
* Efficiency: 88dB

and I found 2 amps that will power it perfectly. I just dont know which one would be better…

Amp 1 http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=16493

or

Amp 2 http://www.onlinecarstereo.com/CarAudio/ProductDetail.aspx?ProductID=19246

Amp 1 or Amp 2??? Which one?

Thanx

I would almost positively go with the Lanzar VIBE286, my buddy has the same exact amp, and although it is on the slightly cheaper side, it has never let him down!

Oh and he definatly doesn’t listen to his subs on low too, every time i see him, i can hear his system over mine and i have an MTX TC 8001 hooked up to two 12 inch Kickers. For as long and hard as he plays it, it doesn’t overheat or give him any trouble, easy hook up to, i helped him install it, its very user friendly.

Hope that helps kid!

I need this for a physics project…. asap

Hobby Lobby

5500 Beckley Road
Battle Creek, MI 49015
(269) 979-1436

.

P3SD412 specs per speaker:

12" Shallow Subwoofer
4 ohm Dual voice coil
400 RMS / 800 Peak power handling
Kevlar Fiber reinforced semi-pressed paper cone and ABS/Acrylic dustcap
Custom 10-AWG nickel plated push terminals
High density poly-foam surround allows for 20% greater linear excursion than standard surrounds
High-temp 2.5" voice coil with spun-laced Nomex® reinforcement collar
Linear spider with embedded 16 AWG tinsel leads handle tons of power
Protective PVC textured magnet cover
Reversible ABS trim ring
Mounting depth: 3-5/8"
Mounting diameter: 11-1/8"
Free air Resonance (Fs): 43Hz
Recommended Sealed box Dimensions: 0.60 – 1.20 cu cu. ft.
Recommended Ported box Dimensions: 1.25 cu. ft.
Sensitivity: 86dB
Magnet weight: 52oz
Frequency response 43-250HZ

2 MTX Jackhammer 12" Subwoofers including box and quick connections. Box is in great shape. Speakers are in great shape. Everything works!

This is a brand new PAIR of ALMANI S3F-12 car subwoofers. Each 12" shallow sub produces up to 1000 watts total max output (500w RMS). This sub has a mounting depth of 4 1/2" so it will allow you to fit them in tight spaces. It has an overmolded rubber surround to provide high bass output and low distortion. The molded nomex spider helps provide long term mechanical stability. It also has big push terminals for maximum power transfer from your amplifier. The peripheral venting helps keep the voice coil from overheating. The S3F-12 is part of the 3 Series from ALMANI. A combination of advanced acoustic engineering and state of the art manufacturing have produced outstanding bass for those on a budget.

This Premier® 12" shallow subwoofer handles 1400 watts max., 350 watts nominal power, and delivers deep bass with top-notch sound quality thanks to features like Pioneer’s extremely strong and lightweight IMPP Composite Double Cone Woofer, the patent-pending M-shaped Surround, and more.One of the new patent-pending features is called the "Air Suspension Control System". This design locks in air between the main cone and drive cone, ensuring smoother and more precise movement of the cones, for superior linearity. The locked-in air behaves like a spring, so there’s no need for a traditional spider structure. The drive cone also deflects air pressure inside the enclosure, which further contributes to the remarkable bass of the small package.

go with the JackHammers… overall better subs.. they’ll last a lot longer as well.

they’re a pretty serious sub too, i own four 12’s and they hit like crazy.

High Density Polyurethane foam

It is one of a group of neutral derivatives of primary amines; its formula is RN&dbnd;C&dbnd;O, where R may be an alkyl or aryl group; an example is 2,4-toluene diisocyanate. Any compound containing the isocyanato functional group.
In other words;
Isocyanate is the functional group of atoms –N=C=O (1 nitrogen, 1 carbon, 1 oxygen), not to be confused with the cyanate functional group which is arranged as –O–C≡N.

Here’s the link: http://www.rivalboxing.com/e/rb40-e.html

So, can I use it for training. I read that bag gloves don’t have much protection, but those gloves look like they do and the description says High-Density multi-layered foam padding for added comfort

Yes you can use the, I do….

in one of my fishing boat I want to rebuilt a cold room. to make a long story short I had to remove the bottom on my cold room, back to the steel of the hull, frames etc in order to proceed with some repairs.
Now it is time to rebuilt the whole thing but where I live I cannot find one contractor who spray polyurethane foam High density..
My idea is to use the small block of the foam I have removed in the first place , compact them in the bottom of the boat and then pour a very liquid cement in order to have a sort of binding agent. It will be very fast and very cheap to do so.
the question is : will it be efficient as far as insulation is concerned?
Polyurethane is a good insulation agent; what about polyurethane mixed with cement; will it retain some insulation properties?

please comment and give it your best shot.. thanks

Your idea would work, However the cement may chip up/break apart. What about getting some foam sheets 1" thick and build it up to the thickness you need and use 5200 marine adhesive to glue them together. Then mix some resin with matting and/or cloth for the finished fiberglas floor.
The foam I am talking about is the cream colored with a foil sheet on the out side. We built bait and fish boxes out of them then fiberglas them up nice and lite yet strong..

in one of my fishing boat I want to rebuilt a cold room. to make a long story short I had to remove the bottom on my cold room, back to the steel of the hull, frames etc in order to proceed with some repairs.
Now it is time to rebuilt the whole thing but where I live I cannot find one contractor who spray polyurethane foam High density..
My idea is to use the small block of the foam I have removed in the first place , compact them in the bottom of the boat and then pour a very liquid cement in order to have a sort of binding agent. It will be very fast and very cheap to do so.
the question is : will it be efficient as far as insulation is concerned?
Polyurethane is a good insulation agent; what about polyurethane mixed with cement; will it retain some insulation properties?

please comment and give it your best shot.. thanks
very interesting answers in general. one of the reason why I want to pour cement in the hold is to fill up nicely all the voids. I am already using a lot of polyurethane spray foam to fill all the gaps and minor crevasses. What i found interesting in all your answers is the fact that cement mixed with foam seems to be a decent insulation product. I am fishing tuna and I have a 3 tons ice machine but i want to keep a good insulation nevertheless in the hold
thank you great job

It should retain insulating properties, cement conducts heat, but much less than steel or aluminum. If most of the surface area is the foam, you should be okay from an insulating standpoint.

The concern I would have is excess condensation from places where the insulation is less. I’d suggest trying something similar on a small scale before modifying the boat. (Perhaps making a two-foot square model of what you’re attempting. You could use dry ice to get the internal temperature cold enough to imitate what you’re trying to do.)

I heard that if you wire subs in a series the ohm’s add up so the 2 4 ohm subs will turn into 8ohm load..so the impendance has to be 8ohm.. is this correct..!!!

12" Dual 4 Ohms Memphis M3 Series Subwoofer
Power Handling:
Peak: 800 watts
RMS: 400 watts
Impedance: Dual 4 ohms
Kevlar reinforced paper cone
High-density foam surround
Custom-cast vented "M" Basket
Bolt-through modular motor for easy repair
Orange finish
Dual 4 ohm voice coils
2.5" Black anodized aluminum 4-layer voice coil former
85oz. Magnet
Sensitivity: 90 dB

Profile ap1000m

LI> Max power output @ 4 Ohm 1 x 650W
RMS power output @ 4 Ohm 1 x 310W
Max power output @ 2 Ohm 1 x 1000w
RMS power output @ 2 Ohm 1 x 500W
MOSFET power supply
Frequency response 20HZ- 250HZ
signal to noise >103DB
stereo separation 83DB
RCA input Voltage 200mV-8v
RCA input Impedance 20K ohms
Load impedance 2-8 ohms
crossover frequency 50 HZ-250HZ
Bass level remote control
Damping Factor 300
Amp Dimensions ( H x W x L ) 2" x 10-1/4" x 13-5/8"
One Year Warranty

Yes, two 4 ohm SVC (single voice coil) subs wired in series will present an 8 ohm load. Wired in parallel they would present a 2 ohm load. Check out the Subwoofer Wiring Wizard here…
http://www.the12volt.com/caraudio/woofer_configurations.asp