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Old 19th November 2007, 08:51 PM   #1
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Default need help!!speaker power

I bought some speakers for my car and I prefer tu build an ampifier in order to use them max,
the main problem is that I don't know so much about speakers,especially about speaker power, and therefore I don't know how much power shoud I deliver to my speakers?
they are (120W / max 180W) RMS ,Z = 4ohm
this means: max amplitude that could appear at speaker is Umax =35V ....?

I calculate this amplitude using the formula Prms=( Umax*Umax)/ 2*Z*1.41

Am I right?

& what is pink noise?
I am so confused....
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Old 19th November 2007, 08:56 PM   #2
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Hi Marius,

I've moved this over to Car Audio for you. These folks should be able to help.
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Old 21st November 2007, 10:20 AM   #3
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ok,
I hope so...
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Old 21st November 2007, 03:36 PM   #4
jol50 is offline jol50  United States
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Speaker power is subjective, it may handle it for a while....a short or long while and depends how clean power is, what mounting/enclosure is used, what frequency is put to them. I would use an amp that is capable of providing clean power at the volume levels you will use it at. Usually 100x2rms is enough for most people for front speakers, maybe not subs.

Pink noise is run through a system so you can measure frequency response, look up audio RTA (real time analyzer) for use of this. For some good info look in here for a post by Perry Babin in most amp threads and follow the link to his site on audio info, it explains most of that stuff in great detail.
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Old 21st November 2007, 06:57 PM   #5
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Can you please be more specific about clean power ?
I didn't understand you so well !

and about frequency... they are all full range if you mean that

Besides,here are my speaker's specifications:
http://www.ground-zero-audio.com/13_download/gztf.pdf
front: GZTF 13T
back: GZTF 69T

Front speakers are mounted indor while back speakers are mounted on the rear panel
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Old 21st November 2007, 07:21 PM   #6
jol50 is offline jol50  United States
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Clean power = no clipping or distortion.

I have run low wattage speakers loud on good clean power, and have seen people destroy high wattage speakers on little amps by abusing them.

The amp, like I said large enough to play loud for you without distorting. I have an old 2x30W amp that is under rated, it will go quite loud if you don't ask it to make a lot of bass. For mids or higher it works great, but not that loud full range. Depends on how loud you like to play it?
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Old 21st November 2007, 08:59 PM   #7
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...I seem to know

I read about clipping on this forum,and what I realized is that it can make a lot of damage even a small amplifier is used,
so... I should use a bigger amp. which will deliver adequate power without clipping...
But how much bigger amp should be ?


I'd like to play it as loud as posible and with a lot of bass if it's possible
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Old 22nd November 2007, 07:34 AM   #8
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How do I calibrate amp power with spk pow ?
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Old 22nd November 2007, 02:39 PM   #9
jol50 is offline jol50  United States
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What I have read is an amp puts out more power when it clips, and that does more damage than the clipping itself. If the ratings on the speakers are right, and that is questionable, you could make an amp that produces that wattage before clipping. If the amp makes that wattage RMS and no clipping that would be good. It would be pretty loud I am guessing.

For lots of bass I would highly recommend you go with some kind of sub. 6x9 will make mid bass, but it is difficult for them to really make big bass. You don't have to get fancy or expensive with subs as quality is not required nearly like with the higher frequency. It is more a matter of what will fit in the vehicle. Even $15 pyramid subs will make good bass unless you want to rattle houses you drive by.
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Old 22nd November 2007, 04:11 PM   #10
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k, let's supose that clipping is eliminated by using bigger amp.,
but .. how should I know when it's egnouh,
I mean can I somehow measure amp power ?

Besides,at your old 2x30W amp...I think that the problem may be with power supply.
Have you measured it's voltage?
When you ask it to make a lot of bass the power sup voltage is decreasing...,
and because of this clipping is taking place...
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