Mosfet Power Amplifier
Dec/100
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What do these car amplifier specs actually mean?
Can somebody please explain them to mein a bit more detail? i'm just wondering what the rms thing is and what the peak is and stuff...
US Audio (USA504E), 2ohm stable operation, 4x50watt RMS/600watts, 4 channel MOSFET power amp.
RMS power vs. peak power
Don't be confused by "peak power" and "RMS power" ratings. Simply put, RMS wattage ratings are a measure of continuous power — while different manufacturers will use somewhat different methods to come up with these figures, it's usually a more "real-life" rating of your equipment's capabilities. Peak power, on the other hand, doesn't try to reflect realistic operation. It's simply a measure of how much power can be generated or handled for very short bursts.
Many manufacturers emphasize peak power ratings by stamping these ratings on their subwoofers and amplifiers.
peak power ratings are not realistic measures of the true power capabilities of the equipment. By comparing the RMS power rating of the sub and the RMS power rating of the amp, you'll have the tools you need to pick the right equipment.
2-ohm stable
the lower the final impedance (ohms) at the amp the easier/cheaper it is to power but the lower the sound quality
common impedances at the amp are .5, 1, 2, 4, and 8ohms
if an amp is 2-ohm stable it means that it can power speakers/subs wired at that impedance and above-- if you wire your speakers up to an impedance below 2ohms the amp will run hot, and send out a distorted signal to the speakers (the main cause of speaker/sub damage) and the amp will constantly go into "protection" (turn itself off) to protect itself and the speakers
4x50watts
first number is the number of channels or how many speakers it can power (a mono block amp {one channel} can power more than one sub just like a 2-channel amp can power more than just two speakers or it can power just one speaker
MOSFET
Metal Oxide Semiconductor Field Effect Transistors have a higher switching speed than bipolar transistors and generate very little heat. MOSFETs offer fast response and high efficiency.
note: that amp is not CEA-compliant so you would be lucky to get half of the advertised RMS wattage and more than likely it would be distorted (the main cause of speaker damage)
CEA-complaint means that it has been tested and produces or exceeds the advertised RMS wattage with minimum distortion-- here are the CEA-compliant brands
Alpine
Bazooka
Blaupunkt
Clarion
Eclipse
Infinity
JBL
JL Audio
JVC
Kenwood
Kicker
MTX
Pioneer
Polk Audio
PPI
Rockford Fosgate
Sony
if you dont know the real RMS wattage its impossible to PROPERLY match your speakers with an amp, and its important- heres why
If you send too much power to your speaker, you risk damaging it. The cone of the speaker and the mechanical parts that make it move may break under the stress. Surprisingly, too little power can also damage your speaker — in fact, it's actually more common than damage caused by overpowering.
When the volume is turned up and the amp doesn't have enough power, the signal becomes distorted, or "clipped." This distorted signal can cause parts of the speaker to overheat, warp and melt. Not good!
You don't have to match speaker and amp wattages exactly. An amp with a higher output than the speaker's rating won't necessarily damage the speaker — just turn the amp down a bit if you hear distortion from the speaker and don't run the speaker at extremely loud volumes for lengthy periods. Likewise, you'll be OK with a lower powered amp if you keep the volume down and don't feed a distorted signal to the speaker.
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