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Old 06-10-2010, 08:42 PM   #1
kirbykirb
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2005 WRX/9-2x
Obsedian Black Pearl

Default Subaru BD, 80W headunit, 30W speakers....something missing here?

So, I have two rear blown speakers, goign to change them out.. (for future anyone, the rear passanger speakers from a wagon/outback are direct bolt in for the sedan BD rear speakers, same harness same everything .)

But, I don't understand the speakers are rated for only 30W, but the headunit is 80W...

So this means the head unit at stock easyily blows the speakers? Because of higher wattage?

OR am I missing something?
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Old 06-10-2010, 09:40 PM   #2
Frogsthatmoo
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Well, that might be a combined figured (80) and what it means is that it distributes 80W over 2 channels which = 40W per channel or 40x2. But I could be wrong. Now-a-days it's represented as 50x2 which means 50W per channel (this is a very common rating). I also believe that the rating is peak which means it's not always operating at that high of a wattage, just when it needs to.

Turn the music down! My car has the original speakers from 1997.
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Old 06-11-2010, 06:01 AM   #3
kirbykirb
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Quote:
Originally Posted by Frogsthatmoo View Post
Well, that might be a combined figured (80) and what it means is that it distributes 80W over 2 channels which = 40W per channel or 40x2. But I could be wrong. Now-a-days it's represented as 50x2 which means 50W per channel (this is a very common rating). I also believe that the rating is peak which means it's not always operating at that high of a wattage, just when it needs to.

Turn the music down! My car has the original speakers from 1997.
Hehehe, had no idea about this stuff so I suppose it makes sense..

:P and when I got my subie one of the speakers were alrdy half blown.. aw well only cost me 12$ to get new speakers!
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Old 06-11-2010, 10:21 AM   #4
Jonathan
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What you really want to know is how many watts RMS per channel the amp is rated for and what the Total Harmonic Distortion (expressed as a percentage) is. In other words 80 watts RMS with .05% THD is a decent amp. An amp that does 80 Watts RMS with 10% THD, isn't. Sometimes the rated power isn't RMS, but instead its "Peak to Peak" which also sucks.

Just because your amp is so powerful doesn't mean you have to overdrive your speakers.
Excessively load music can seriously damage your hearing, you could become deaf or perhaps more likely you could loose the ability to hear high frequencies (12,000+ MHZ).

Running you amp at moderate volume means you have lots of reserve capacity, and therefore likely very less THD.

Pretty much ANY high-quality aftermarket 2-way or 3-way speaker will vastly improve your cars sound. Dollar for dollar, it is one of the cheapest and most effective improvements you can make. Although, if you have the money adding a seperate subwoofer isn't a bad idea.

Just what sort of music do you listen to ?
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Old 06-11-2010, 05:16 PM   #5
kirbykirb
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Quote:
Originally Posted by Jonathan View Post
What you really want to know is how many watts RMS per channel the amp is rated for and what the Total Harmonic Distortion (expressed as a percentage) is. In other words 80 watts RMS with .05% THD is a decent amp. An amp that does 80 Watts RMS with 10% THD, isn't. Sometimes the rated power isn't RMS, but instead its "Peak to Peak" which also sucks.

Just because your amp is so powerful doesn't mean you have to overdrive your speakers.
Excessively load music can seriously damage your hearing, you could become deaf or perhaps more likely you could loose the ability to hear high frequencies (12,000+ MHZ).

Running you amp at moderate volume means you have lots of reserve capacity, and therefore likely very less THD.

Pretty much ANY high-quality aftermarket 2-way or 3-way speaker will vastly improve your cars sound. Dollar for dollar, it is one of the cheapest and most effective improvements you can make. Although, if you have the money adding a seperate subwoofer isn't a bad idea.

Just what sort of music do you listen to ?
Me, anything really... :P techno and pop rock, etc etc

just replaced speakers and hehehe no more blown speakers :]
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Old 06-18-2010, 04:34 AM   #6
Stevenvirginia
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The "80W" is divided by 4, (not 2 frog) and that's going to be combined peak power-not RMS per channel. Factory specs are not CEA compliant. This is a Definition....

CEA-2006 Compliant
On May 28, 2003, the Consumer Electronics Association published standard CEA-2006, "Testing & Measurement Methods for Mobile Audio Amplifiers." This "voluntary" standard advocates a uniform method for determining an amplifier's RMS power and signal-to-noise ratio. Using 14.4 volts, RMS watts are measured into a 4-ohm impedance load at 1 percent Total Harmonic Distortion (THD) plus noise, at a frequency range (for general purpose amplifiers) of 20 Hz to 20,000 Hz. Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. This applies to both external amplifiers and the amplifiers within in-dash receivers.

CEA-2006 allows consumers to be able to compare car amplifiers and receivers on an equal basis. Manufacturers who choose to abide by the new standard are able to stamp their products with the CEA-2006 logo that reads: "Amplifier Power Standard CEA-2006 Compliant."

If you must know the truth, your factory deck puts out around 7.5W RMS per channel.

Last edited by Stevenvirginia; 06-18-2010 at 04:55 AM. Reason: to make it clear
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Old 06-18-2010, 09:03 AM   #7
Frogsthatmoo
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^ Well, it's divided into two channels which is split to four speakers individually. But yes, you're right.
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Old 06-18-2010, 02:07 PM   #8
kirbykirb
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o_o well I feel dumb now.

oh well my speakers still work! =D
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Old 06-18-2010, 04:42 PM   #9
Frogsthatmoo
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It's ok, at least you have new speakers now
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