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Power Matching - Speakers and Amplifier

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  #1  
Old 11th August 2008, 04:39 PM
 
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Power Matching - Speakers and Amplifier


Dear friends,

A query about matching the amplifier power and speaker power. I am using 100Wx2 RMS stereo integrated amplifier. This is

connected to floorstanders of 150Wx2 RMS output. While purchasing the floorstanders from Mr. Murugesan (late), Audiocraft, he told me that it is always suggested to use higher powered speakers than the amplifier power because it is safe for the speakers when the volume is raised accidentally to the maximum. Contrary to this, somebody told me that the speaker power can be less than 20% of the amplifier power so that the maximum power of the speakers are utilized. Are these two methods technically correct? Or using the same powered speakers and amplifier (e.g. 100W speakers+100W amplifier) will produce good results?

Please share your views.

Regards,
Muthusami. S
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Old 11th August 2008, 04:59 PM
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Re: Power Matching - Speakers and Amplifier

Before forum expert/s pitch in , I would like to add something. Driving a high power capacity speaker with a very low powered amp is more dangarous than a high power amp driving slightly less power capacity speaker.

It is the low power amp when maxed out , clips and causes maximum damage to speakers.
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Old 11th August 2008, 09:56 PM
 
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Re: Power Matching - Speakers and Amplifier

You'll blow your ear drums before a speaker reaches its excursion limits due to amplifier current. More power is never an issue. Its the lack of it that is the problem since the amp can clip causing blown tweeters in a speaker.

However to confuse you even more, the output sound quality of an amp has nothing to do with its power capabilities. A 10 watt amp can have as much drive as a 100 watter at times and can sound better too.
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Old 12th August 2008, 08:52 AM
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Re: Power Matching - Speakers and Amplifier

Quote:
Originally Posted by Muthusami S View Post
Dear friends,

A query about matching the amplifier power and speaker power. I am using 100Wx2 RMS stereo integrated amplifier. This is

connected to floorstanders of 150Wx2 RMS output. While purchasing the floorstanders from Mr. Murugesan (late), Audiocraft, he told me that it is always suggested to use higher powered speakers than the amplifier power because it is safe for the speakers when the volume is raised accidentally to the maximum. Contrary to this, somebody told me that the speaker power can be less than 20% of the amplifier power so that the maximum power of the speakers are utilized. Are these two methods technically correct? Or using the same powered speakers and amplifier (e.g. 100W speakers+100W amplifier) will produce good results?

Please share your views.

Regards,
Muthusami. S
Dear Muthusami,
A speaker just does not blow. As mentioned by Roc & Suhas its much more likely to blow a speaker with a small amp driven into hard clipping as against a bigger amp. With a larger amplifier u will simply get better sound and will extract every last ounce from your speaker and there will be a sense of effortlessness as the load(the speaker) is easily handled by the amplifier.

A friend of mine is driving speakers rated at 150w @ 8 ohms with 600 w monoblocs and they sound sublime. U will probably leave the room with the sound pressure before the speaker blows. I personally am driving a speaker rated at 120W with a 300 W amp and the sound is definately more dynamic than when i drove them with a similar bryston which was 150W.

But if some fool were to turn the amp to the maximum am sure there will be some damage but IMO that would occur irrespective of amp size. Actually once again your ears are the deciding factor as u will hear the speaker STRAINING to reproduce accurately as u increase the volume. Lastly most reputed speaker makers will rate their speakers conservatively as opposed to say a sony Midi system which will claim to dish out 4000/5000 watts PMPO!!!!

Regards
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Old 12th August 2008, 09:46 AM
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Arrow Re: Power Matching - Speakers and Amplifier

Hi,

Think of speaker's sensitivity.If sensitiviy is low (85db), you need 100 to
150w amp to drive.
If 90 db then 30 to 50 w amp (for same sized speaker)is ok.

If high wat speakers combined with low wat amp ,speaker will ask for
more current from amp to drive smoothly (duo to lower sesitivity)
Result-Distortion,damaging your amp.

So go with low wat speaker with high wat amp.
Even whathifi mags suggest Tannoy 70 wat spk with 140w Onkyo avr.

Hope you got.
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Old 12th August 2008, 09:46 AM
 
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Re: Power Matching - Speakers and Amplifier

Dear Sri Muthu,
pl refer to the spec of any company make HTiB and u will get ur answer. Always the amp carries more power than the max rms driver can handle and as a thumb rule they can be in 2/3rd range of amp rms. U need only to take care not to cross the limit of ur amp when the driver becomes no more sweeter for ur ears. The chance of getting ur amp heating up and finally just blowup due to higher current is more when u connect the drivers of higher rms than the amp. For ur drivers with 150w rms each u can have something around 200w rms per channel amp at the impd. rating of ur drivers. Hope this will clear ur doubt. In case u have low impd. drivers as compared to the rated amp. then suitable correction factor can be taken, if ur amp is able to handle low impd. drivers, may be just 4 or 2 ohms.
regards
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Old 12th August 2008, 11:32 AM
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Re: Power Matching - Speakers and Amplifier

Quote:
Originally Posted by diplomat View Post
Dear Sri Muthu,
pl refer to the spec of any company make HTiB and u will get ur answer. Always the amp carries more power than the max rms driver can handle and as a thumb rule they can be in 2/3rd range of amp rms. U need only to take care not to cross the limit of ur amp when the driver becomes no more sweeter for ur ears. The chance of getting ur amp heating up and finally just blowup due to higher current is more when u connect the drivers of higher rms than the amp. For ur drivers with 150w rms each u can have something around 200w rms per channel amp at the impd. rating of ur drivers. Hope this will clear ur doubt. In case u have low impd. drivers as compared to the rated amp. then suitable correction factor can be taken, if ur amp is able to handle low impd. drivers, may be just 4 or 2 ohms.
regards
Hi,
Actually i have no idea of HTIB but am surprised to learn that the built in amplifier delivers more than the speakers power rating.
Amps normally heat up when driven and more when driven hard. Depends on the type of amp. Low Speaker impedance, poor ventilation etc are more likely for an amp to go into a thermal shutdown than driving a speaker with a larger power handling IMO. Some larger amps heat to a point where you cant touch the heat sinks and still play ok for years.
Regards
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Old 12th August 2008, 01:44 PM
 
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Re: Power Matching - Speakers and Amplifier

Hi,

I thank you all very much for your explanations. It is very useful to me. So is it better to upgrade my amplifier from 100W to 200W because the woofers are 150W RMS. Please advise.

Regards,
Muthusami. S
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Old 12th August 2008, 01:48 PM
 
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Re: Power Matching - Speakers and Amplifier

Again... buy an amp that sounds better. Not an amp that has higher specs. I just got a used Class A Musical Fidelity A1 integrated amp for my bedroom speakers. This dimunitive amp is rated at a very meagre 20Wx2. However you should see the way it moves speakers. Both my speakers - The Usher Be-718 and Jamo E700 are very hard to drive as both have very low sensitivity and they are not an easy load for an amp. However you'd be amazed at what this little amp can do. Just 20W but I've seen weaker 100 watters than this.
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Old 12th August 2008, 01:59 PM
 
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Re: Power Matching - Speakers and Amplifier

Quote:
Originally Posted by reignofchaos View Post
Again... buy an amp that sounds better. Not an amp that has higher specs. I just got a used Class A Musical Fidelity A1 integrated amp for my bedroom speakers. This dimunitive amp is rated at a very meagre 20Wx2. However you should see the way it moves speakers. Both my speakers - The Usher Be-718 and Jamo E700 are very hard to drive as both have very low sensitivity and they are not an easy load for an amp. However you'd be amazed at what this little amp can do. Just 20W but I've seen weaker 100 watters than this.
Thank you very much.

Regards,
Muthusami. S


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