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OK, need a little help here. Been outta the audio scene for a while and decided to put a little bump back in the car. I have 2 Alpine M-200 amps. I just purchased some Rockford Fosgate punch 12's. The amp is 2 ohm stable and the speakers are 4 ohm. I have listed the specs below. I hooked up the speakers positive to negative on the amp. Is there anyway else I can hook these up to get a little more out of the speakers? Its kinda disappointing.

Speakers
Size 12"
Impedance 4-Ohm
Power Handling 150 Watts RMS
300 Watts Max
Voice Coil Diameter 1.5" 6-Layer
(3.81 cm)
Motor Size 40 oz.
Speaker Connector Dual 10 AWG compression
Fs (Hz) 25
Re (Ohms) 3.40
Le (mH) 3.9
Qms 7.30
Qes 0.58
Qts 0.54
Vas (Liters) 109.0
Sd (cm2) 540
SPL (1w/1m) 86 dB
Xmax (mm) 9.0
Woofer Displacement 0.048 cu. ft.
(1.36 Liters)
Cutout Diameter 11.125 in.
(28.26 cm)
Mounting Depth 5.875 in.
(14.92 cm)
Shipping Weight 12.50 Lbs.
(5.67 Kg.)
Rec. Sealed Enclosure 1.02 cu. ft. (28.88 liters)
Range: 0.70 cu. ft. - 1.80 cu. ft.
Range: (19.82 liters - 50.97 liters)
Rec. Vented Enclosure 1.79 cu. ft. (50.69 liters)
Vented Tuning Frequency 36 Hz
Port: (1) 3" diam. x 6" long
Port: (1) 7.62 cm x 15.24 cm


AMP

Amplifier Type What is "Amplifier Type"?
Mono Channel
Bridgable What is "Bridgable"?
Not Bridgable
RMS Power at 4 Ohms 150 W x 1
RMS Power at 2 Ohms 200 W x 1
Performance
Frequency Response 20 Hz - 200 Hz
Signal to Noise Ratio What is "Signal to Noise Ratio"?
100 dB
THD at Rated RMS Power 0.08 %
Crossover / Equalizer
Bass Boost What is "Bass Boost"?
With Bass Boost
Low - Pass Frequency 50 Hz - 200 Hz
Other Features
Input Voltage 11 volt
MOSFET Circuitry Yes
3 Way Ready No

 
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Single of Dual Voice Coil?

 
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single

 
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try hooking them up in bridged parallel if the amp is 2 channel

 
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Its a non bridgeable mono amp

 
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use 1 amp for each sub. that will give them the max power they're designed for at 150w each at 4ohms each.

 
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The amps that you have are 150 watts at 4 ohm and 200 at 2 ohm. The best wiring scheme would be to have one amp on each sub. There are some things you need to make sure of though
1- make SURE the amps the phase ( +/- ) are wired correctly

2- the settings on each amp are the same
I.E. crossover points, gain, etc...

3- when using 2 amps the subs should be in separate
enclosure area. It is fine to use a single box, but there
should be a divider keeping each in their own air-space.

4- most importantly make sure the subs are in the correct
enclosure. Go to www.rockfordfosgate.com
search for your specific sub by the model # on the
speakers backplate and they will provide you with the
proper box deminsions. If the box they provide doesn't
fit how you would like, you can build or have one built.
Just take the internal enclosure volume they recomend
and make one. If you don't know how to convert
dimensions to volume, all you have to do is use this
formula ( width x height x depth = volume...
volume in inches / 1728 = cubic ft.)

Cover those steps and you should be getting optimal results. You may also want to test those older amps to make sure they are working properly. If you don't know how to do that, let me know and I'll help you out. I'm also assuming that the amps are properly hooked up.So If your not sure, look in the audio section of these forums, everything is covered there.
Hope some of this helps you out bro!

 
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I have done everything you listed for the get go and no luck. I mean, they hit just not as hard as I think they should. I was just thinking maybe there was a way to make the amp see a 2ohm load and make it push 200 watts instead of 150. How do you test the amps?

 
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use 1 amp for each sub is the best option here.. if not try buying a new amp..

 
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Here is how you test an amp http://www.teamrocs.com/technical/pages/amppower.htm
As far as getting the amps down to 2 ohms... You can't unless you only use one of them. But then you ate only giving each sub 100 watts. I would advise getting the new v-series mono from Alpine to push them both. It is 500 watts @ 2 ohm and under $200 from Crutchfield. If more power doesn't do it for ya, well, it's time for new subs man

 
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OK a) its pointless to do 2 amps for 2 subs. b) you dont need "technically" a 500W amp for your subs that only hit at 150W/RMS, since the manufacturer says "150w/rms" for safety reasons so you dont blow the amp. I dont know how you have it connected, i dont know if your running 2 wires from one sub to another then to the amp (parallel to keep it 4ohm) or if your running 2 separate sets of wires from each sub to the amp (which should net you 2ohms), is the gain all the way up? freq set to 80 or 100hz? bass boost on?

if you did everything here then maybe your need another amp, and you can probably make that money by selling the two amps and getting a JL, MTX or Memphis amp (IMO)

 
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+1 on the new amp but, you need to wire the subs together to get them down to 2ohms with the single 4 ohm voice coils subs. To get them down to 2 ohms just connect the positive to the positive and the negative to the negative from sub to other then run one positive and negative wire to the amp off of the one sub. Just make sure you have the correct air space and get a new amp and wire your subs to 2ohms. I personally would reccomend the alpine m-1000 amp as you will get enough power to your subs without having the gain past the recommended setting which is basically just a little past halfway. I am running one of these amps on a L5 solobaric 12 and it pushes it great. Also, you havn't mentioned your head unit. You may not be getting enough signal to your amps to get a good result.

 
Rep Power: 313

I'm no expert on audio but you should play with your deck equalizer settings to get optimal performance out of your subs. The other thing to consider is that 300 watts RMS isnt really all that much power for pushing large speakers. I have something like 450 watts RMS and I have tweaked it heavily and it still does not thump all that loud even at max achievable volume. The other thing to consider is how much you can actually turn the deck up volume wise without distortion, because if you get distortion early in the volume range then your not getting full use out of your subs. My deck goes to 30 and when I've got it past 17 my speakers distort, but I can turn it up to just about full and my subs will not, if you know what I mean.