Question about Phoenix Gold QX90.2 Car Audio Amplifier

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Power rating I have a 30watts rms x 2 channel bridgeable car amp. and my question is if its ok to connect my 10" speaker rated 100watts rms to this amp?

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If the speaker can be wired to be a safe load for the amp, it's OK.

Posted on Jun 08, 2008

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Rms watts per channel @ 4 ohms


Take the peak to peak power rating and multiply it by .727
that should be the RMS watts.

You don't have to worry too much about new stuff, but if you are using an older stereo amplifier that is rated for 8 ohm speakers then you should not use 4 ohm or they will pop the finals in the amp.
You could use 2X 4 ohm speakers in series on every channel and it should be ok.

Jan 31, 2015 | Lightning Audio Car Amplifiers

1 Answer

Can i hook this amp to a 2 channle out put stereo?


Sure. Specs are listed below. I think it's designed for regular 2-channel input, isn't it?

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Front Channels: 100 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)
  • Rear Channels: 25 W RMS x 2 @ 1.5 ohm-4 ohm(11V-14.5V)
  • Subwoofer Channel: 250 W RMS @ 1.5 ohm-4 ohm (11V-14.5V)
  • THD at Rated Power: <0.03% @ 4 ohm (F&R), <0.05% @ 4 ohm (Sub)
  • S/N Ratio (F&R): >108.5 dB below rated power S/N Ratio (Sub): >95 dB below rated power
  • Frequency Response (front and rear): 5 Hz-30 KHz (+0, -1dB)
  • Frequency Response (sub channel): 5 Hz-500 Hz (+0, -1dB)
  • Damping Factor (front and rear): >200 @ 4 ohm/50 Hz
  • Damping Factor (sub channel): >500 @ 4 ohm/50 Hz
  • Input Range: switchable from 200mV-2V RMS to 800mV-8V RMS
  • Differential-Balanced Input Topology: (3 pairs of inputs)
  • Front Crossover: fully-variable (50 Hz-5 KHz), selectable- slope BP or HP (12 or 24 dB per octave)
  • Rear Crossover: fully-variable (50 Hz-5 KHz), selectable- slope HP (12 or 24 dB per octave)
  • Sub Crossover: fully-variable (40-200 Hz), selectable-slope LP (12 or 24 dB per octave)
  • Preamp Output: 2-channel (full-range or LP)
  • Bass EQ: Variable boost up to 15db
  • Infrasonic Filter: defeatable 24dB/octave at 30 Hz
  • Left minus Right Ambience Circuit: ambient effect for rear channels
  • Front and rear speaker output connections: accept up to 8ga. wire
  • Dual mono subwoofer output connections: accept up to 8ga. wire
  • +12V and Ground connections: accept up to 4ga. Wire
  • Dimensions: 19.7"L x 9.25"W x 2.36"H
  • Dec 02, 2010 | Jl Audio 500/5 Car Audio Amplifier

    1 Answer

    Can this power a subwoofer and what is the rms wattage


    Hello crucible19,

    The Alpine MRP-F240 is a 4-channel amp that outputs 40 watts RMS per channel. It is more suited for powering normal speakers, but since it is bridgeable, you could power a small sub by bridging 2 of the channels.

    Hope this helps.

    Oct 02, 2009 | Alpine MRP-F240 Car Audio Amplifier

    2 Answers

    Car Ampli Problem


    forget hooking this on a subwoofer. this amp produces only 50 watts per channel at 4ohms or 70 watts per channel at 2 ohms RMS...
    If you try bridging the sub, it will only give out maybe 100watts bridged.
    So..... if your sub is, lets say 1000watts RMS, youre just going to bust your amplifier to smoke...
    Find a more decent and powerful amp. This amp is only intended for separates and lowend subs with an RMS of 80 to 150 watts

    Sep 08, 2009 | Eclipse EA3422 Car Audio Amplifier

    1 Answer

    What speakers


    Hello enot99,

    The CC-2502 is a bridgeable 2-channel amp. If you want to drive normal speakers in stereo, the best would be a good set of components with separate woofers, tweeters, and crossovers. They are available in many sizes from most car audio manufacturers. I'd begin by finding out what speakers fit the location where you intend to mount them. Then I'd browse the speaker selections in that size at www.crutchfield.com. You can also use the "outfit my car" feature to browse only the products that fit. Then select a pair that has a power range and impedance to match the amp: 250 watts RMS at 4ohms or 450 watts RMS at 2ohms.

    If you want to use the amp in bridged mono mode to drive a subwoofer, again Crutchfield has a large selection of subs and some enclosures already fitted with subs (loaded). The amp claims 850 watts RMS into 4ohms bridged, so look for a sub that has a power handling rating of at least 850 watts and it needs to be 4ohms.

    Hope this helps.

    Aug 02, 2009 | Concept CC-2502 Car Audio Amplifier

    1 Answer

    I was given a kenwood kac742, what do i have to do to hook up 2 subs to it tom


    You need:
    1) 2 4-ohm subs
    2) Appropriate enclosure
    3) Amp wiring kit with RCA's

    Connect each sub to a separate channel and set both mode switches to "MONO" (center position). In 2-channel mode, this amp is only rated at 80 Watts RMS, so you need relatively small and efficient subs. I'd say nothing bigger than 8" or perhaps 10". Rockford-Fosgate P1S48 (8") and R1S410 (10") will work OK with 50-150 watts RMS. Some others will also.

    Mar 25, 2009 | Kenwood Car Amplifiers

    1 Answer

    Do you have instructions for wiring install on volfenhag GX8200??


    Amplifier Class AB
    Number of Channels 2
    RMS Power (4 ohms) 120 watts x 2 channels
    RMS Power (2 ohms) 200 watts x 2 channels
    RMS Power (1 ohm) Not Stable
    Bridged RMS Power 400 watts x 1 channel
    Total RMS Power Output 400 watts
    Peak Power Output 1000 watts watts x 1 channel
    Minimum Impedance Unbridged 2 ohms
    Minimum Impedance Bridged 4 ohms
    THD at Rated RMS Power 0.1%
    Speaker Level Inputs No
    Preamp Outputs 1 pair
    Built-in Crossover High-pass (HP), Low-pass (LP), Full (AP)
    High-Pass Crossover Frequency 40 - 250 Hz
    Low-Pass Crossover Frequency 40 - 250 Hz
    Subsonic Filter N/A
    Signal-to-Noise Ratio N/A
    Channel Separation N/A
    Bass Boost 0 - 18 dB
    Bass/Gain Remote Yes
    Fan Cooled Yes
    Fuse Rating 20A x 2

    Dec 24, 2008 | Volfenhag ZX-8200 Car Audio Amplifier

    1 Answer

    I found this amp and I can't seem to figure out what the wattage is?


    You are probably aware on how to use these output figures, but I'll write a quick explanation on the specifications for future readers anyways :)

    The concpet CC-452 amplifier has the following power output specifications:

    Calculated at 14.5 volts DC;

    At 4 ohms per channel - 45 watts x 2 (RMS)
    At 2 ohms per channel - 70 watts x 2 (RMS)
    At 4 ohms bridged - 150 watts x 1 (RMS)


    This means that your amplifier would provide 45 watts of power each for your front speakers, which are normally a 4 ohm load per side (45 watts for left, 45 watts for right), that's unless they are one of those exotic higher end brands (eg: Boston Z6s which are 3 ohms). Rarely, you will find speakers that are rated at 2 ohms per side, but in this instance the amplifier will provide 70 watts of power into each speaker. On your speaker specifications, you will find a value termed "nominal impedance" which will give you the ohm rating of the speakers being used..

    On the other hand, if you "bridge" both channels into a single channel (using a diagram often marked on the speaker terminals of the amp), you could then provide 150 watts into a subwoofer (providing it was a 4 ohm woofer).

    It's not recommended to use this amp bridged under 4 ohms..

    Some subwoofers may be lower than 4 ohms, and you will not be able to use this amplifier for these types of speakers without risking amplifier failure. Also, some subwoofers may have 2 seperate voice coils, and you will have to use both channels of the amplifier seperately (not bridged) in order to correctly connect this type of speaker for use.




    Oct 28, 2008 | Concept CC-452 Car Audio Amplifier

    1 Answer

    Connecting a subwoofer to a mono amp that has 2 sets of terminals


    ok this gets confusing sometimes. Ok first look to see what ohm your subs are. If you have a dual 4 ohm sub When you run that on sub + to + and - to - then that will make that sub 2 ohm. its different on ohm if the sub is say a 8 ohm then putting the wires that way will bring that sub to 4 ohm. Now lets say you have 2 subs that are dual 4 ohm and wire both of them + to + and - to - and go bridge the amp which would be both wires from sub both + together and both - wired bridge on the amp will make it a 1 ohm to the amp. Please post what ohm your subs are and i can tell you alittle more about it

    Oct 21, 2008 | Verge VGA300M Car Audio Amplifier

    1 Answer

    Logic alx1280 2 ch amp


    Amps can be rated based on their RMS power or their peak power. In this case, the amp's rated RMS power is 300x2 at 2 ohms (total 600W RMS) with a peak power rating of 600x2 (1200W peak). For the most part, peak power means almost nothing.

    If your head unit didn't have RCA preamp outputs, you would used the standard speaker outputs from the head unit and connect them to the hi input plug of the amp.

    Mar 17, 2008 | Logic Soundlab ALX1280 Car Audio Amplifier

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