$1799.98 Buy It Now or Best Offer
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Seller Store blrreggae777
(1291) 100.0%,

Location: Silver Spring, Maryland
Ships to: US,
Item: 203704682557

Restocking Fee:No
Return shipping will be paid by:Buyer
Returns Accepted:Returns Accepted
Item must be returned within:60 Days
Refund will be given as:Money Back
Non-Domestic Product:Yes
Shape:Round
Warranty:No Warranty
Voice Coil:Single
Size:24
Custom Bundle:No
Color:Black
Manufacturer Part Number:24NDS151U1
Modified Item:No
Channels:Mono (1 Channel)
Placement on Vehicle:Trunk or Speaker Box
JAHsound:JAHsound
Type:Non-Enclosed Passive Subwoofer
Features:Subwoofer
Country/Region of Manufacture:China
Impedance:8 Ω
RMS Power:2500

BRAND: JAHsoundI’ve been drawing, designing and building concert speakers, mid, hi’s and full range speaker boxes for over 40 years, and if nothing else one thing I’ve learned is not to chase name brands of any kind. There are some little known brands like mine JAHsound that have no choice but to work and fight twice as hard to make great products that are even as good or better than the commercial brands. So, I’m always willing to give the lesser known brands a try, and because of that I’ve bought and tested hundreds of different brands of speakers over the years and can vouch for our brand of woofers that are on the cutting edge of technology. They will meet or beat your expectation and I can say that with full confidence, All hell break loose when these start to play, they are Awesome! NEWLY DESIGNED, Waterproof, Rugged, Strong and take a pounding all day and night. – BRAND: JAHsound- 4 OHM- 8 OHM- 6 INCH COPPER VOICE COIL – 97.2 dB/SPL SENSITIVITY- 2500 WATT CONTINUOS – 5000 WATT PROGRAM POWER HANDING – FEM OPTIMIZED MOTOR AND SUSPENSIONS – 57mm PEAK TO PEAK MAXIMUM EXCURSION – OPTIMIZED COOLING SYSTEM – DOUBLE SPIDER – RESONANCE FREE AND HEAVY DUTY BASKET DESIGN – TRIPLE ROLL SURROUND- WATERPROOF- BUILD TO ORDER (BTU), TAKES 4-8 WEEKS Check out my other items! 18 Inch Car Subwoofer 3000 Watt RMS 1.8+1.8 Ohm 4″ Voice Coil Check out my other items! Super Bullet Tweeter 120W RMS 8 Ohms Pro (The Real Deal) 7 Different Colors Check out my other items! SUPER BULLET TWEETER (BEYMA) SYSTEM FOR HOME – DJ – CLUB & CAR (Built To Order) 1ea Check out my other items! SUPER TWEETER DUAL BOX FOR HOME – DJ – CLUB & CAR (Built To Order) JAHsound Check out my other items! Super Tweeter Box Empty Dual 1ea Built To Order 1ea Check out my other items! SUPER BULLET TWEETER SOUND QUAD SYS FOR HOME – DJ – CLUB & CAR *The “Real Deal” with 8 ohm drivers from DIY MOBILE AUDIO* I’ve seen many people say, “Well I want to use this speaker, but I’m put off by the fact that it’s 8 ohms.” Let me explain why it’s ok to use an 8 ohm speaker, and why it could actually be better than a 4 or 2 ohm speaker. First of all, using a higher impedance than what your amp is nominally rated for is always ok. In fact, if your amp is rated for 4 and 2 ohm impedances, typically you will get less power into 8 ohms meaning that your amp will run cooler and more efficiently at higher impedances. It won’t hurt your amp, and in fact it’s actually much better for your amp’s longevity. Now, you’re probably saying how is getting less power out of my amp a good thing? Think of your amp’s power reserves as your bank account. Just because you have 100 dollars in your bank account doesn’t mean you have to spend it all. Quite the opposite. Wouldn’t you rather spend LESS and get MORE? That’s exactly what you’re doing when you use less power from your amp, and get the same amount of output from a high efficiency speaker. Remember, most speakers are rated at 2.83V. A 4 ohm speaker rated for 90db spl at 2.83v is really being rated at 2 watts! Whereas an 8 ohm speaker rated for 90db spl at 2.83v is only being rated at 1 watt. You can do the math for yourself, Power = Voltage^2 / resistance. At 2 watts, we can assume that same 8 ohm speaker is actually rated at 93db spl (remember, every doubling of power gives you a theoretical 3db gain in spl). So using that 8 ohm speaker will give you the same amount of output, at half the power required as a 4 ohm speaker. Your amps run cooler and draw less power from your vehicle’s charging system, your speakers run cooler, and everyone is happy! Ok, now let’s look at another example of an 8 ohm versus 4 ohm voice coil. Typically, the efficiency of a speaker is given by: Efficiency = ( B^2 * L^2 ) / ( R * Sd^2 * Mms^2 ) B = magnetic field strengthL = length of wireR = resistanceSd = surface areaMms = mass So for your 8 ohm voice coil, using the same wire as a 4 ohm voice coil, you would need twice the L or length to get an 8 ohm impedance. That makes sense doesn’t it? A longer wire will have more resistance. Now, looking at the formula above, doubling L actually causes your efficiency to rise, even though the impedance also rises. So in this very oversimplified example, raising the impedance actually causes efficiency to go up and lowering the impedance actually causes a loss of efficiency. What’s important to remember is that it’s the overall output and efficiency of the speaker that’s important, not the impedance. A high impedance, high efficiency driver can get just as loud off a small amount of power as a low impedance, low efficiency driver that sucks a ton of power! Just because you have a 100 watt amp doesn’t mean you have to use all 100 watts…. it’s all about being efficient. I also found this excellent post by Dan Wiggins over at carstereos.org: “I think one thing to consider is that going to a higher impedance voice coil will result in better packing of the voice coil, meaning a higher cross-sectional-area of copper in the flux, for a given mass. If you take a given driver, and simply swap out voice coils, you end up with more efficiency as you increase the impedance. Take a voice coil, say 2″ diameter, 1″ winding length, 24AWG 4 layer, and swap it with a 2″ diameter, 1″ winding length, 27AWG 4 layer, and you double the impedance, but the efficiency also goes up – less mass and better packing density.” It’s because the moving mass has dropped, and if desired – because of the thinner wire diameter which packs in tighter – you can put more layers in the voice coil and potentially raise the BL.”

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