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Hey guys i just got installed my Alpine CDA 9855 and now im going to buys either 2 12" Alpine Type Rs or Type Ss, and an Amp... My question is what is the main difference between 2ohm and 4ohm subs... And what type of Amp should i use to power the subs...

 
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Those Type R's require some power (500W RMS) each. They are Dual 4 ohm which mean you can wire then up to any 4 ohm capable amp. 2ohm means less resistance which means you can put more power to them. Alpine makes a V12 amp that does 700 W RMS @ 2ohm X 1. I have hooked this up to 2 Type E's and it sounded really good. Don't know if that's enough for 2 Type R's. I don't know also if those Type S's are DVC or not but you may want to consider those because those Type R's are power hogs. You might want to consider 2 500W RMS amps or 1 1000W RMS amp to power those.

 
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Thanks for the info... Im getting ready to order the 4ohm type rs

 
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less ohms = less resistance = better sound. go for dual voice coils. better handling of power. i had 2 12" with a 2k watt amp and burned them cause they were single voice coil. be careful.

 
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I got 2 10' type Rs man they hit.. but boy they eat power.. dont skimp on the amp. and a good box

 
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wrong wrong wrong.

2 ohm vs 4 ohm vs dual 2 ohm vs dual 4 ohm all boils down to the wiring configurationt that you want for your amplifier. 2 ohm is a lower impedance, but that does not mean you can put more power to them. It means that it will increase the power output of the amp, IF the amp is stable at that load. Type-E or Type-S or even Type-R for that matter do not sound good, I would even go as far to say they sound bad. 700 watts is enough for 2 type r's. any amount will be enough as long as it is clean undistorted power. no sub is a "power hog", it will only "hog" as much power as the amp puts out. 700w would be fine for 2, 1000w would be even better.

find out what amp you want first, and THEN decide whether or not you need 2 or 4 ohm subs based on what configuration will get the most output out of your amp. If you go ahead and buy dual 4 ohm subs (which will give you a final load of 1 or 4 ohm, depending on how you wire them), and your amp is only 2 ohm stable, you either are going to risk wrecking your amp OR not get full power out of it. if that is the case (amp is 2 ohm stable) then you cna go and buy dual 2 ohm (or even single 4 ohm) subs after the fact and get your system running to it's full potential

 
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less resistance = worse sound. dropping the impedance by half will double the distortion. therefore it equals worse handling of power as the increased distortion will make your subs more prone to blow up at higher volumes. you did not burn your subs because they were single voice coil, you burned them because either a) your subs couldn't handle 2kw, or b) you don't know how to set your amp up properly.

 
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I've got 1 type r and the mrd-m605 (600 watts rms at 14.? volts 2ohms) and it sound excellent. there is also the type x that are crazy (1000 watts rms) but they are more than double the price of the type r's.

 
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from what i understand, less ohms means less resistance and less heat. i burned my voice coil out and thats why it burned. not cause i couldn't set my amp up. i love subs. i have been dealing with them since ive had a car. amps are not that hard to understand. i still believe that having 2ohm resistance is better that 4. my opinion. my gf has mtx 10"s and a 800 watt amp. its nice in a gtp. btw distortion is caused by the sound clipping. meaning you have to tune an amp. once you do that clipping should not happen unless you just turn it up too loud. imo 2 ohm subs sound clearer than 4 ohm. thats just me.

 
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ALPINE SWR-1242D TYPE R 12" DVC SUBWOOFER
FEATURES:
Impedance 4 + 4 Ohms
Dual Voice Coil:
500 watts RMS
1500 watts peak
Kevlar reinforced pulp
Rubber Surround Material
Custom cast aluminum frame with integrated perimeter venting and heat transfer plate
Frequency Response: 24 Hz - 500 Hz
Sensitivity: 87 dB
Mounting Depth: 8"
Sealed Box Volume: 0.7 - 1.0 cubic ft
Ported Box Volume: 0.75 - 1.75 cubic ft

Those are the specs of the subs i want... But now im all confused lol i know they also sell Type R that are 2ohms but they are very hard to find for a reasonable price.

 
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less resistance = more heat. I guess that can be your opinion, but mine is that no ohm load is "better", to me whatever load will make your system properly set up is best.

clipping can happen in other ways as well, through signal, and having your gains improperly set, as well as other factors

 
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but lets not get a dispute started in this thread, stick to the focus and answer the man's question

 
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agreed. stick with the 4 ohms. cheaper anyway. make sure the box you put it in is correct with specs for subs. if you don't the subs will really sound like a$$. good luck

 
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agian, 2 ohm vs 4 ohm is a matter of a proper system configuration... I've never seen 4 ohm subs more expensive than 2 ohm, in most cases that I can recall, SVC is the same as DVC as well

 
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Im getting the 2 of the 12" Type Rs at 110 a pop... so its not too bad considering i already paid about 360 for the headunit... Now i just need to get an amp and wiring kit. Thanks for the help guys not only have i been helped but i learned alittle bit.

 
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Alpine MRD-M301
V12 AccuClass-D™ Design
• 350W x 1 RMS (2ohm;@14.4V 1% THD+N)
• 250W x 1 RMS (2ohm;@12V 1% THD+N)
• 150W x 1 RMS (4ohm;@12V 1% THD+N)
• Digital Control Center with LED Display
• Bass Engineฎ DSP:
- Parametric EQ
- Crossover
- Time Correction
- Subsonic Filter
- Phase Control
- Bass Compensator
• Remote Bass **** or Remote Amplifier Control Center (RACC) ready
• Amplifier Link Ready
• STAR Topology
• 8 Volt Input Capability
• Integrated Wire and Screw Down Terminals
• Variable Turn-on Delay
• Thermal Managment Processor

 
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Is this the amp you are getting?


Get the 2 ohm DVC's.

What Megahurts is trying to say is, you will be severely underpowering the two 4 ohm subs.
That amp is stable down to 2 ohms. Why not power the two 2 ohm subs and get the max outta your amp.

You can wire the 2 subs (2 ohm) connecting the two voice coils of each driver in series (+ to -) and the drivers themselves in parallel (+ to +, etc.) and achieve a 2 ohm load and give the subs 350W

or

You can wire the 2 subs (4 ohms) connecting the two voice coils of each driver in series (+ to -) and the drivers themselves in parallel (+ to +, etc.) and achieve a 4 ohm load and give the subs 150W