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The old Rockford-Fosgate was probably producing the rated power. The Sony is most likely overrated. But, it's supposed to be stable on each individual channel down to 2 ohms and will deliver 65 watts RMS into that load. So to get the most from it, your best bet would be a pair of 4 ohm speakers paralleled to each channel. A relatively efficient speaker like the Kicker 07DS600's shown here should provide pretty good sound.
paulcreber19, All audio amplifiers have their outputs measured for power output using a pure sinewave input of 1khz. With the outputs loaded with the appropriate noninductive, noncapacitve, purely resistive load (1% tolerance load resistors), a RMS voltage reading is made just prior to driving the amplifier into distortion or peak clipping of the output waveform. Knowing the RMS voltage and the OHMIC value of the load you will be able to calculate the RMS current (I) and then calculate the power using variations of OHMS LAW to find RMS power output. To calculate the absolute PEAK power (a measurement not used for rating audio amps anymore) you simply multiply the RMS power by 2.828 to arrive at PEAK pwr. So, your question should have been what is the power output per channel @ 1khz sinewave and less than 1% distortion with an 8 ohm, 16 ohm, 32 ohm load applied to the output. I'm pretty sure this is correct. If not, please let me know where I screwed up.
Bye for now. 12fixlouie
Hi mate very nice amp you got there here is the specs for it
Model: MA Audio HK401SX
Hard Kore Series 1800 Watt 1 Channel High Performance Class
X Car Amplifier
1 x 1800W RMS @ 0.5 Ohm Mono
1 x 1200W RMS
@ 1 Ohm Mono
1 x 650W RMS @
2 Ohm Mono
1 x 500W RMS @
4 Ohm Mono Fully Unregulated MOSFET Power
Supply 2 Ohm Stable @ Mono 1 Ohm Stable @ Mono 0.5 Ohm Stable @ Mono
if you have 2 12s just bridge them and you will have 650wrms at 2ohm running to them or one sub at 4 ohm 500w rms ps they should pump iam running 2 12s with just 360rms at 2ohm and they do the job good luck
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
400 watts delivered to 300 watt speakers the only way to do this would be to wire two subwoofers in series so that the power needed to drive them will be 600 watts to max, however this will increase your impedance on the speaker (8 ohms) load so what you can do to compensate is get an 8 ohm 600 watt resistor and put it in parallel with the speakers you will then have 4 ohms of impedance at a total capacity of 600 watts of power
In other words the amplifier won't blow these out now.