If My Car Stereo Says 22 Watts RMS And 50 Watt Peak Power What Size Amp Should I Get

Posted in Car Electronics | Asked on Jan 14, 2012

The back 6×9′s say 110 RMS and 450 Peak Power, But the 5 1/2 inch door speakers say 35 RMS and 160W Peak power(they are all 4 ohms). They are Kenwood.

The lady at the store said to find a 50 Watt X 4 at 4 ohms amplifier. Wouldn’t sending 50 watts RMS blow the door speakers? Is there a way to have the amp send more power to the back and less to the front speakers?

Also the car stereo has a built in amp already. Will a new amp be added to the amp already in the deck. Should that be considered? Or will it bypass the deck amp.

I only found Alpine having those specs. And a few rare older Kenwood amps.

I want to thump so tell me my best and most practical options. The deck has 3 sets of RCA preamp outputs (What is a preamp????), what is a bridge or crossover??

p.s. So far I’m really disappointed at the sound.

There are 3 Answers for "If My Car Stereo Says 22 Watts RMS And 50 Watt Peak Power What Size Amp Should I Get"

  1. Rick29148 says:

    The speakers will only pull what power they need, so you’re okay. A preamp is just a stage in the amplification process. The signal is received from the whatever – radio, CD player, etc, & it then goes into the preamp section. The preamp is the section of the amp that has the multiple inputs for different devices. The preamp boosts the signal just a bit & then passes it to the main amp section, where the majority of the amplification is done. So, if you have a preamp OUT, that takes the different signals & gets them ready for the main amp, but instead of sending the signal to the main amp, it goes to the preamp OUT plug. From there, you can go to another amp, to a graphic equalizer, or a couple of different things, but taking the preamp OUT to a separate main amp is the most popular. So, you could add a bass amp to the system by hooking it to a preamp OUT plug, but leave the other four speakers where they are using the main amp built into the head unit. Then, as your ear becomes better, you could add a second separate main amp to another of the preamp OUT plugs for just the higher frequescies. It’s good to have the preamp OUT plugs – It gives you more options.

  2. Charles says:

    That stereo if you buy and external amp none of them figures matter,that is to tell you what the internal amp if you wired the speakers right to the stereo that’s how much power they would receive from the internal amp in the stereo. but if you get an external amp this gets joined to the stereo buy RCA cables if you have the rca ins and a sub out in the back of the stereo.the RCA cables plug in them holes and run to what ever amp you pick,and the speakers get hooked up strait to the new amp you buy.the RMS rating is important so look for it on what ever amp you buy,and that will be the true power your amp is making for you speakers or sub woofers.some amps can boost the RMS rating big time.some to 1 hundred RMS or bigger per channel.you must go to a audio store and pick his brain about what external amp will fit you best good luck.

  3. Desire says:

    Kenwood have put their reputation building car amplifiers that no-nonsense reliability and superior sound quality. The compact KAC-8404 4-channel amplifier features a rugged cast aluminum housing more than 40% smaller than its predecessor, but it would be to pump still 50 watts RMS into 4 channels – ideal for enhancing the performance of the front and rear speakers in your system. Or you can use the amplifier 2-channel mode, the bridge and a few U-boats with 180 watts RMS without any effort on your car’s electrical system.