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Rear speakers:
This is where I am stuck-
For the rear speakers, would it be better to use coaxial 6.5's or a matching 6.5 component set? Are components used for rear, or should I just go with coaxials? or is this another matter of opinion like asking "whats better, blondes or redheads or brunettes?" I would like to stay with the image dynamics brand for sq, price, and comparable output to the front channels. What would be better for the rear speakers- coaxial 6.5's or a component set?

Amp:
This is actually what made me want to post this thread- THE AMP!!!!
At the car show yesterday, I talked for quite a while with the audio guru that does all the installs at the shop that hosted the car show, and I had a long list of amps that I had looked at, including amps from Alpine, kenwood, polk, precision power, RF, Cadence, audioque, and MB Quart. He pretty much shot them all down and said to go with either Audison, Memphis, or Hertz. However, the only one of these that are within my price range is the hertz HE4.1, but its still a little high in price, and it only puts out 70 watts x4, and the ctx65's are 100 w rms. Ive been told over and over that its better to overpower than underpower, and people run the ID's as high as 150-200w per channel, which I don't really want to do, 100-130 will probably be best i think, right? He assured me that Hertz's 70w x4 would be ample, but i am still not sure. He said that of any of the amps on my list, alpine is the only one that would be okay or acceptable in terms of stuff he would ever use, and cadence he has no experience with but he had heard good things.. So after reading and searching for hours for a good 4 channel amp to power the front and rear speakers, I'm between the Alpine MRX F65, a Cadence Q4000, a Cadence D100.4, or a Cadence Vegas. I started comparing stats and I have no idea what damping factor, SN ratio, or any of this actually means, so I really have no way to compare these. What would you all go with between these 4? Any input on experience with these amps would be great.

Background:
I listen to a wide range of music,alice in chains, beats antique, black sabbath, citizen cope, coal chamber, cream, deftones, faith no more, fear factory, five finger death punch, godsmack, gorillaz, jerry cantrell, joe satriani, korn, lamb of god, meshuggah, mushroomhead, ozzy, opeth, pantera, a perfect circle, powerman 5000, primus, pucifer, rammstein, red hot chili peppers, rob zombie, static x, stone temple pilots, system of a down, tool, white zombie, to name a few
I am doing a complete overhaul of the stock system in my 2005 Saturn Ion Redline series. I have a LITTLE bit of an idea of what I am doing , but I AM fairly new to this. I did do an install on my old vehicle years ago, but I didnt really know what i was doing then, and heres what I have lined up so far:

Deck:
I ruled out double din head units because I am on a student budget- I would love a double din with navigation and everything, but just not enough green! So single din for now- I read hundreds of threads, everything from naga to Mckintosh, old alpines, but i wanted something with good/ decent SQ AND modern features like iPhone connectivity, etc. It was between a Clarion CZ702, a Alpine CDE-HD138, a Sony DSX-S310BTX, or a Kenwood KDC-X996. I chose the Clarion because it has digital time alignment, 5v pre-outs, built in bluetooth, pandora, the works. It was a real tossup between the 702 and the 138, the only con for both was there was no HD radio on the 702, and the 138 had no digital time alignment. I went with the 702 because I am on a budget, and from my understanding, Alpine is going to be putting out new decks in may that will allow cloud sharing of thousands of presets and eq settings, and a mind boggling array of other things, so I will upgrade to that then, but for now just the clarion, $159 shipped.

Front speakers:
There are component 6.5" stock speakers, and I decided to stay with components. I was shopping around for weeks, reading forum posts and calling local shops, and I was ping-ponging between Phoenix Gold components, Morel Maximos, Hertz, Polk MM, and Image dynamics. I went to a car show yesterday and there was some incredible work there, and so I started to look at 3 way systems, but they were too pricy (hertz=$300-$500 a set), Hertz and morel seemed to be a standard, but they were simply out of my price range, so I finally landed on the Image Dynamics CTX65cs set for $125 shipped.

To recap:

Should I go with coaxials or component 6.5's for rear speakers?

AND, which amp should I use to power 2 pairs of image dynamics 6.5's- cadence q4000, Cadence D100.4, Cadence Vegas, or Alpine MRX-F65. All of these are within my price range, just not sure which one will make the CTX's sound the best. Thanks for reading and helping!
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specs:
D100.4 Specs:
Class AB 4-Channel Amplifier

Specifications
• 4 Ohm RMS Power: 100W x 4
• 2 Ohm RMS Power: 150W x 4
• 4 Ohm Bridged RMS Power: 300W x 2
• PEAK Power: 1200W
• Minimum THD: <0.01%
• Frequency Response: 10Hz - 65 kHz
• S/N Ratio: >100dB
• Damping Factor: >600 @ 100Hz
• Channel Separation: >65dB
• Dimensions (L x W x H): 12.4" x 8.6" x 2.4"

Features
• High Speed MOSFET Power Supply
• BiPolar Japanese Sanken Output Transistors
• 16V Capable Power Supply
• Copper Rail PCB Architecture
• 24dB Crossover Circuitry
• Adjsutable Subsonic Filter via HP Crossover
• Band Pass Capable
• Adjustable 12dB Bass Boost @ 45Hz

Control Panel Features
• Remote Bass Control via RJ11 Jack (Remote Not Included)
• Input Mode: 2 or 4 Channel

Channels 1-2
• Gan 9V to 0.2V
• Clone Channel 3 & 4- FR / HP Allows you to set CH1 and CH2 to High Pass or Clone. The Clone feature aligns CH's 1 and 2 to CH's 3 and 4 thus giving you uniform sound
• High Pass Frequencies: 10Hz - 300Hz or 150Hz - 4.5 kHz (with a 15x frequency multiplier switch activated)
Channels 3-4
• Gain: 9V - 0.2V
• LP/BP - FR/HP Control
• High Pass Frequency Control: 15Hz - 500Hz
• Bass Boost: 0dB - 12dB

• Low Pass Frequencies: 45Hz - 450Hz or 450Hz to 4.5kHz (w/ 10x frequency multiplier switch activated
• Accepts 4 Gauge Power & Ground Wire // 10 Gauge Speaker Wire
-----------------------------------------
Vegas Specs:
Class AB 4-Channel Amplifier

Specifications:
• 4 Ohm RMS Power: 135 Watts x 4
• 2 Ohm RMS Power: 225 Watts x 4
• 4 Ohm Bridged RMS Power: 450 Watts x 2
• Minimum THD: <0.01%
• Frequency Response: 10Hz – 40 kHz
• S/N Ratio: >100dB
• Damping Factor: >220 @ 100Hz
• Channel Separation: >65dB
• Dimensions (L x W x H): 24” x 7.25” x 2.25”

Features:
• High Speed MOSFET Power Supply
• Studio-Grade Bipolar Output Stage Transistors
• Fully Adjustable 12dB / Octave Crossovers
• Low Pass: 40Hz – 150Hz
• High Pass: 50Hz – 500Hz
• 18dB Bass EQ Boost Control
• 3-Channel Mixed Mono Capable
• Mute and Delay Soft Start System
• Full IC-Controlled Protection Circuitry
• Fully Adjustable Subsonic Filter
• Dashboard Bass Remote Control Included
• 8 Volt Pre-Amp Circuitry
• RCA Pre-Amp Line Output
• Input Mode Selector Switch
--------------------------------
Q4000 Specs:
Class AB 4-Channel Amplifier

Specifications:
• 4 Ohm RMS Power: 125 Watts x 4
• 2 Ohm RMS Power: 190 Watts x 4
• 4 Ohm Bridged RMS Power: 380 Watts x 2
• Frequency Response: 10Hz – 40 kHz
• Minimum THD: <0.1%
• S/N Ratio: >97dB
• Damping Factor: >150 @ 100Hz
• Channel Separation: >50dB
• Input Voltage: 200mV – 8V
• Dimensions: 16.9” x 7.9” x 2.4”


Features:
• High Speed MosFET Power Supply
• BiPolar Professional Audio Grade Output Transistors
• 16V Capable Power Supplies
• Copper Rail PCB Architecture
• 12dB Crossover Circuitry
• Bass EQ
• Crossover Modes: Low Pass / Band Pass, Full Range, High Pass
• Input Modes: 2Ch, 4Ch
• Low Pass Frequency: 50Hz - 500Hz (Ch3 & 4)
• High Pass Frequency: 50Hz - 500Hz (Ch1 & 2), 50Hz - 150Hz (Ch3 & 4)
• Bass EQ: 0dB - +12dB (Ch3&4)
• High Level Inputs
• Line Level Inputs
• Smart Turn On: Music Sense / DC Sense (High Level Inputs)
• Power / Diagnostics LEDs
• Accepts 4 Gauge Power & Ground Wire // 14 Gauge Speaker Wire
--------------------
MRX F65 Specs:

Features and Specification

CEA-2006 Power Rating: 110W RMS x 4 (4-ohm, 14.4V at <1% THD+N)

Max Power Output Ratings

Max Power: 1200W

RMS Power Ratings

Per channel into 4 Ohms: 110W RMS x 4 (14.4V at Ƈ% THD+N)
Per channel into 2 Ohms: 160W RMS x 4 (14.4V at Ƈ% THD+N)
Bridged 4 Ohms: 320W RMS x 2 (14.4V at Ƈ% THD+N)

Sound Tuning

Crossover Frequency (HPF): 50 - 400 Hz, -12dB/oct.
Crossover Frequency (LPF): 50 - 400 Hz, -12dB/oct.
EQ (Equalizer): 0 to +12dB (CH3/4, fc=50Hz)

Dimensions

Foot Print (WxHxD) mm: 270 x 58 x 230 mm
Foot Print (WxHxD) in: 10-5/8'' x 2-1/4'' x 9''
Heat Sink (WxHxD) mm: 210 x 58 x 230 mm
Heat Sink (WxHxD) in: 8-1/4'' x 2-1/4'' x 9''

General

Power Requirements: 14.4 V.DC (11-16V allowable)
Input Sensitivity (RCA Input): 0.2 - 4.0 V
Input Sensitivity (Speaker Level Input): 0.5 - 10 V
Input Impedance: >10k ohms
Frequency Response (+0, -3dB: 1W into 4 Ohms) for CH-1/2/3/4: 5 - 45k Hz
THD+N (10W into 4 Ohms) for CH-1/2/3/4: Ɔ.02 %
THD+N (100W into 4 Ohms) for CH-1/2/3/4: Ɔ.07 %
Damping Factor for CH-1/2/3/4: >500
Signal to Noise (Rated Power into 4 Ohms) for CH-1/2/3/4: 106 dB
Weight: 2.7 kg

FEATURES

Install

Terminal Layout: Two-Sided
Screw Mount / Wire Cover: Integrated Wire and Mounting Screw Terminals

General

Amplifier Type: Class-D (Digital)
Channel Design: 4/3/2 Channel
Power Supply Design: DC-DC PWM Power Supply
Power Supply: MOSFET
Final Outputs: Direct FET
Crossover: Variable Low Pass & Hiigh Pass Filter
Gain Control: Continuously Adjustable Gain Control
Bass EQ: Bass EQ Function
Thermal Control: Multi-stage Power Limiting
Low-impedance Possibility: Low-impedance Possibility
Current Protection: Over-Current, Over-Voltage and Thermal Protection
Board Circuitry: S.T.A.R. Circuit
Board Design: 6-layer Glass Epoxy PC Board
Speaker-Level Inputs: 4-channel Speaker Level Inputs
Power Indicator: Top Mounted Blue LED Power Indicator
 
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