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Why 'most' 4 ohm speakers are better to ones with higher impedance?

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Old 17th February 2011, 01:55 PM
 
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Why 'most' 4 ohm speakers are better to ones with higher impedance?


Noob question, I know ..... but was giving a thought to it ... basically, no work pressure in office today, so .......

.......... Idle brain is Devil's workshop ......
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Old 17th February 2011, 02:34 PM
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

Who told you that higher Impedence spk are bad?Where did you read?
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Old 17th February 2011, 03:55 PM
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

I guess its the other way round.. Higher impedance speakers are always better than lower ones.
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Old 17th February 2011, 04:08 PM
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

As far as my experience the higher imp the smoothness is the sound. Distortion less sound. It may be because low imp speaker may be difficult one for the amplifier to drive. Peculiarly the mids and highs were too bright or forward in the lower imp speaker. But most of the jamo speakers are 6 or below ohms
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Old 17th February 2011, 04:23 PM
 
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

My question was ..... in other words ... why most high end speakers have 4 ohm rating?

I am more interested in the quality of sound output. High end here, translates to better sound, right? A Google check would reveal that most high ends are with 4 ohms.

Now, as a 'sound' user, why should I bother whether the amplifier is finding it difficult to drive a speaker pair or not? Obviously, I would have factored it in. Selected a compatible high current amplifier for power hungry speakers.

But, thats not my question .......
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Old 17th February 2011, 04:26 PM
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

it MAY be that to match with most amps, there is greater COMPROMISE.
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Old 17th February 2011, 05:14 PM
 
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

Quote:
Originally Posted by avidyarthy View Post
My question was ..... in other words ... why most high end speakers have 4 ohm rating?

I am more interested in the quality of sound output. High end here, translates to better sound, right? A Google check would reveal that most high ends are with 4 ohms.

Now, as a 'sound' user, why should I bother whether the amplifier is finding it difficult to drive a speaker pair or not? Obviously, I would have factored it in. Selected a compatible high current amplifier for power hungry speakers.

But, thats not my question .......
@avidyarthy
Even I observed most high end speakers have 4 ohm or 6 ohm rating and less sensitivity around 86dB/87dB.

Most top brands when they say 4 ohm it means their impedance through out the frequency spectrum doesn't drop below 4 ohm or when they say 6 ohm the minimum figure stay somewhere 6 ohms and offer linear impedance characteristics.

Most entry level speakers when they say 8 ohms they are claiming that figure at certain frequency range which they don't mention in specs. There may be a frequency range in the spectrum where the impedance may be dipping to say 2ohms or even less which makes it tough for an amp to drive them.

You don't need to worry when a speaker says 4 ohms. All you need to bother is the speaker offering linear impedance which is key to the performance than fluctuating impedance and 90dB+ sensitivity. Sometimes the speaker spec doesn't make sense.

I would like to put here what I observed when I upgraded my speakers. With my old speakers (Mission M32i 8ohms and 90dB sensitivity) I used to feel my amp hood used to get hotter and I feel like switching it off for 10 mins for every 2 hours of running it.
When I upgraded my speakers to Mordaunt-Short Mezzo 2 89dB and 4-8ohm rated impeadance to my surprise the amp doesn't feel its running hotter like before though the later spec doesn't look as promising as before.
From my understanding the excess heat from the amp could be the amp struggled to drive the Missions and on the other hand the M-S Mezzo's are easy on the amp. No offence to Mission users after all the M-S Mezzo's are few times costlier to Missions.
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Old 17th February 2011, 10:54 PM
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Smile Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

Quote:
Originally Posted by avidyarthy View Post
My question was ..... in other words ... why most high end speakers have 4 ohm rating?

I am more interested in the quality of sound output. High end here, translates to better sound, right? A Google check would reveal that most high ends are with 4 ohms.

Now, as a 'sound' user, why should I bother whether the amplifier is finding it difficult to drive a speaker pair or not? Obviously, I would have factored it in. Selected a compatible high current amplifier for power hungry speakers.

But, thats not my question .......
Dude, that is because lower the impedance, lower the LOAD to the Amp and hence higher the Current output by the Amp (IF IT IS CAPABLE OF HANDLING THAT LOW LOAD). If the Amp is capable of driving a 4 ohm load, using them will result in higher power output than 8 ohm (sometimes and theoretically TWICE).

Main thing which boils down here is - if your Amp is capable of providing current enough to drive 8 ohm speakers, when connecting a 4 ohm speaker will introduce DYNAMIC THD which results in voltage being dropped due to lower load impedance. Essentially the output voltage will be unstable during high power application as the Amp will struggle to supply enough current to DRIVE the load and hence will randomly drop the voltage (higher the power output from the Amp, higher the drop (delta) in voltage to compensate for the higher current drain by the speaker).

Gist - Use speakers with LOWEST load impedance supported by the Amp for highest power output by the Amp (again, actual output depends on the stability of the impedance across the sound spectrum and the SPL of the speakers). Using speaker with HIGHER than minimum impedance MAY improve quality as the Amp will generate more STABLE voltage and current at different stage (with minimum drop in delta of voltage at high volume levels). Hence the THD will remain lower at higher impedance while the maximum power output by the Amp will be reduced due to lower current output (due to higher load impedance).

Hope this helps you in choosing the right speakers for your Amp and hope I dint sound Greek to an average audience.
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Old 18th February 2011, 07:53 AM
 
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

amps will give u the specs - how much it can drive for 8 and 4 ohms ...match that with speakers ....

make sure output of amp > output of speakers ....this will ensure that amp has sufficient power to drive your speakers ...

output is diff from impedance
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Old 18th February 2011, 09:25 AM
 
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Re: Why 'most' 4 ohm speakers are better to ones with higher impedance?

Quote:
Originally Posted by prankey View Post
Hope this helps you in choosing the right speakers for your Amp and hope I dint sound Greek to an average audience.
Latin ..... Tamil ... Malayalam .... Telugu ....


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