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post #1 of 17 Old 01-15-2015, 12:06 PM Thread Starter
LeeZJ
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Sound system max power

Hi guys,
I know this subject has been covered to death but I have been searching all day and still not found the answer to my questions.

I recently bought a new head unit with an output of 4x50w, reading the manual it says do not use speakers lower then 50w 4ohm rating, now I know the stock system is much lower than this.

My question is, as the power gets sent to the amp first will this matter much? And will it just blow out the speakers first if played too loud?

I want to upgrade the speakers as a couple are blown anyway and was also wondering how much power the stock wiring can take as I do not want to rewire, would a 4channel 200 rms amp be able to be simply swapped out? Then I could buy some cheap and cheerful 4ohm 50w rms speakers for the doors.

Sorry for wall of text, first time attempting changing anything other then the head unit, audio is not my strongpoint.

Lee

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post #2 of 17 Old 01-15-2015, 12:20 PM
kg6mov
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Just replace the speakers and use the stock amp. It will act as a buffer amp from your head unit and be fine. The stock amp is actually very clean, it's the stock head and speakers that suck.


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post #3 of 17 Old 01-15-2015, 01:32 PM Thread Starter
LeeZJ
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So if I were to go get 4x speakers anywhere between 45w-80w I would be fine? Or would going as high as 80w be a waste with the stock amp?
There are some ok deals at my local car-shop for speakers, components in the front with new tweeters and 2way/coaxial in the rear sound about right?

Thanks, Lee
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post #4 of 17 Old 01-15-2015, 01:36 PM
kg6mov
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The stock amp is something like 120W total. So 45W rated speakers would be pretty reasonable.


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post #5 of 17 Old 01-15-2015, 02:20 PM Thread Starter
LeeZJ
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Ok cool, I found these Sony XS-GT1728F, 40w rms 230w max seem pretty reasonable at 30 a pair.

Thanks, lee
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post #6 of 17 Old 01-15-2015, 10:00 PM
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yea .......... butttttttttttttt .... the stock system runs on 2 ohm speakers .....

Not sure what the stock amp would do pushing into 4 ohm speakers ...

first thought is it is going to run hot or it will run the speakers coils hot .. never really understood that part but .....

this is coming form the guy that rebuilt the speaker cones and re soldered the spiders on them ... but I have a PERFECT running a stock infinity gold 10 speakers niner original system that does actually sound as good as it should ..... and did in 98 ....
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post #7 of 17 Old 01-15-2015, 10:07 PM
kg6mov
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You've got it backwards, 2ohms is harder on an amp than 4ohms. Speakers will be fine.

I run exactly what I described, non stock head feeding factory amp and polk audio db651 speakers.


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post #8 of 17 Old 01-15-2015, 10:10 PM
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4 ohm speakers won't load the amp as much. So the amp and the speakers will run cooler. The downside is your amp wont be delivering max power.
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post #9 of 17 Old 01-16-2015, 01:47 AM Thread Starter
LeeZJ
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Quote:
Originally Posted by kg6mov
You've got it backwards, 2ohms is harder on an amp than 4ohms. Speakers will be fine. I run exactly what I described, non stock head feeding factory amp and polk audio db651 speakers.
I see they are 60w rms speakers, do you run 4 and happy with the sound?
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post #10 of 17 Old 01-16-2015, 07:06 AM
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Having anyone mention that your speakers' power rating should be higher than the output of the amp is honestly full of crap. It's always better for the health of the speakers to occasionally slightly over-power them with a big amp, than it is to try driving them with a small amp - underpowered amp will burn the speakers MUCH quicker due to clipping, than an amp that has enough juice to properly drive the speakers. Not only can you hear clipping, but it will also destroy your speakers..


All that being said, amount of sound produced is not about only watts or ohms. You gotta take into consideration the sensitivity of the speakers, and a few other things. ..and any of that has NOTHING to do with sound quality. You can have a lot of sound, which sounds like crap, or you can have a well- playing system that puts out almost the same amount of sound but in much higher quality.


edit: Btw., a normal floor- standing home speaker on a large living room will actually produce a lot of sound at a mere 1W average power output from an amp. Bass driver does require more juice, but if you're playing at an average power output of around 1W-5W you're already producing somewhere in the region of 80-85dB on most speakers. Sensitive speakers would produce even more. Now, a vehicle is a much smaller enclosure - if you don't want to wear earplugs, you don't very often need much more than 10W of TRUE power per channel. Subwoofers are another story, but not even they usually require huge amounts of power at normal sound levels. Playing loud - that's when you MUST have enough juice on the amp(s) to drive the speakers properly.

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post #11 of 17 Old 01-16-2015, 07:55 AM
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Having been a design engineer in the audio industry for going on 35 years, its funny to read the amount of technical misinformation described here. And no, I am not about to spend the amount of time or energy typing out a response other than to the OP:

You will be fine with either adding the head unit to the factory amp with new speakers or replacing the head, amp and the new speakers you found.

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post #12 of 17 Old 01-16-2015, 09:16 AM Thread Starter
LeeZJ
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Just picked up 4x pioneer ts-1721i speakers as they were the cheapest and easiest to get today, going to fit them along with the head unit tonight, as I will have 4 2-way speakers i assume i would be better off disconnecting my dash tweeters?

Thanks for all your help so far guys
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post #13 of 17 Old 01-17-2015, 07:15 AM
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I didn't like the dash tweeters. They sound tinny. You'll be happy with the improved sound of just a decent head unit and new speakers.
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post #14 of 17 Old 01-17-2015, 01:36 PM Thread Starter
LeeZJ
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I disconnected the dash tweeters, front speakers sound a lot better and clearer, the rears though sound like they're under a pillow, can only hear bass and minimal voice, swapped speakers around and all ok on the front so I know its not the speakers themselves.
positive the new head unit is connected correctly, I would get no sound at all if its wasn't right?
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post #15 of 17 Old 01-17-2015, 02:43 PM
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Quote:
Originally Posted by LeeZJ View Post
I disconnected the dash tweeters, front speakers sound a lot better and clearer, the rears though sound like they're under a pillow, can only hear bass and minimal voice, swapped speakers around and all ok on the front so I know its not the speakers themselves.
positive the new head unit is connected correctly, I would get no sound at all if its wasn't right?
The rear doors don't get much love. You can get a new amp but I removed them and used them in my sound bar. I think the rear door speakers sound like crap and it's better without them if you have a stock amp.
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