solid_snake
Member
- :
- 2006 Mazda Tribute S-V6
just curious to know how much power the stock head unit has.
thanks
thanks
MotegiMazdA said:I changed my stock unit because it wouldnt play burned cd's for me. One of the last things I bought for the car actually. I dont even remember what it sounds like.![]()
1sty said:Oh dear God
1. A actory head unit has about 10watts x4 and aftermarket one has 15 x 4 to 25x4. 50x4 is a max number the unit is theoreticly capable of. Its called a peak power rating and its useless.
2. Speakers DO NOT HAVE WATTS. Putting in speakers of a certain power rating (watts) only means that they are capable of taking that power if you have it to give. A head unit and even most amps will never get near 200 watts to each speaker.
3. Speakers that say "200 watts" on the box are again quoting a technicly possible peak value. Again this is a peak power rating. The speaker could handle it for a millisecond before becoming a moltent pile of metal and plastic. These speakers are usualy around the 30-60 watts rms range.
4. THERE WILL NEVER BE A 200-300 watt HEAD UNIT!!!!!!!
AAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!
1sty said:Oh dear God
4. THERE WILL NEVER BE A 200-300 watt HEAD UNIT!!!!!!!
Protege52003 said:craig,
I have V-power in my HU, she must put out 240 Watts.......
-R
Nicely done.banden said:this thread got me to join this forum... (my first post)
for fun I decided to test the power of my stock head unit by hooking up a multimeter (voltmeter) to my speaker output on the unit.
I used a whitenoise cd and played a track that had a 20hz to 20000hz frequency range
using my laptop and FFT spectrograph software I turned the unit up to a point where it had no more than 0.04%THD at any given time.... which is a respectable and moderate amount.
Im using a set of 6 ohm speakers
and the voltmeter read: no less than 4.22 V
plug that into the equation: W=Vsquared/A and we get a wattage of
Da-da-da-DAAAA! about 3 WATTS per channel (1 channel driven at a time)
Multiply that by root means square (.707) to get our respectable RMS rating:
4 x 2.2 watts RMS (20-20khz, 6 ohm, 0.04%THD)
we can increase that number quite a bit by going to a 4ohm speaker with 1% thd and only play a 1khz tone... infact we can get a 8volt min. reading doing this... which translates under these circumstances to about:
4 x 11.3 watts RMS (1khz, 4ohm, 1%THD)
and if we were to measure peak performance I can use a 11.22 volt peak reading under who knows how much distortion... and maybe plop in a 3.5 ohm speaker load to create an utterly amazing and obviously much more powerful sounding:
4 x 35 Watts peak
So if you wanna know how many watts your deck is... just pick any number between 1 and 140 watts and you wont be wrong.
1sty said:Nicely done.
How did you determin amperage, measure or calculate?