Author Topic: Is LS3/5A 15 ohms speaker better than the 11 ohms LS3/5A speaker?  (Read 26922 times)

Offline Rancho

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Audiophile expert,

Anyone can advise me if the 15 ohms LS3/5A is better than the 11 ohms LS3/5A speakers?

Do I need a high power intergrated amplifier to drive a 15 ohms speakers?

Currently, all the new 11 ohms LS3/5A speakers are made in China. Is the new LS3/5A 15 ohms speakers also made in China?

Appreciate someone can advise me accordingly.

Thank you so much.

Offline Audio

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In this day and age, speaker load should be as low as possible....4 ohm is norminal, but not as crazy low as 1 ohm.

That is to say, a 11 ohms speaker would be better and easier to drive than a 15 ohm speaker.

(Audio)

ghemml

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Depending on the True Output Impedance of your amp. Generally solid state amp should be much issue.

Offline GAGA@echoloft

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In this day and age, speaker load should be as low as possible....4 ohm is norminal, but not as crazy low as 1 ohm.

That is to say, a 11 ohms speaker would be better and easier to drive than a 15 ohm speaker.

(Audio)
hi, don't quite catch the principle....care to elaborate? amplifier output impedance aside, why would u say a lower impedance speaker is easier to drive than a higher impedance one? with this statement, you have really woke me up from my after lunch doze..... ;D
« Last Edit: May 28, 2013, 13:47 by GAGA@echoloft »
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Offline joamonte

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Audiophile expert,

Anyone can advise me if the 15 ohms LS3/5A is better than the 11 ohms LS3/5A speakers?

Do I need a high power intergrated amplifier to drive a 15 ohms speakers?

Currently, all the new 11 ohms LS3/5A speakers are made in China. Is the new LS3/5A 15 ohms speakers also made in China?

Appreciate someone can advise me accordingly.

Thank you so much.

XP LS 3/5a expert , Luohan and lieu , where are you ?  ;D

just to share.

1)Most LS 3/5a collector I know own more 15 ohm than 11 ohm , some 10/20 pairs of 15 ohm and only 1 or 2 pair of 11 ohm...

2) In Ebay , the average final biding price of 15 ohm is double or even triple of 11 ohm model.....other than rare case like KEF black piano , Harberth Gold tweeter, Roger 60th anniversary , Rogers 50th anniversary , most 11 ohm final biding price is cheaper than a pair of new current production China Rogers LS3/5a.

3)Strictly speaker, China LS 3/5a is not real LS 3/5a , its woofer and tweeter are make in China cloning the original KEFs driver , and the box is make of MDF ( Original LS 3/5a is plywood) , no matter the sound how close to original LS 3/5a , it is still not LS 3/5a.


So is 15 ohm sound better than 11 ohm? I cannot say yes , because a lot of 11 ohm owner will be very unhappy if somebody say that , ;)  but after own and compare a few pair of11 ohm and 15 ohm LS 3/5a, I currently keeping 3 pair of 15 ohm not only for listening , but also for investment ....... I almost never lost money selling LS 3/5a , every few year the Vintage 15 ohm LS 3/5a value increase(can't say the same for 11 ohm model) ,  where to find such audio product, can play, can listen and can maintain its resale value?

Offline Rancho

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Wow! really appreciate the overwhelming response on this topic.

So the LS3/5A 15 ohms is a collector's item.

Is it true that all 15 Ohms LS3/5A speakers are made in UK and none made in China? If yes, why? For if it is a sought after item, the China man will want to clone it and make money.

Next question comes to my mind is, which is better... Harbeth, Roger, Chartwell, Spendor or maybe more. Which one is the actual collector's brand sought after?

Please educate me.

Thank you all so so much.

Kind regards.

ghemml

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The 1st LS3/5A is design in 1970s.

Even the drivers from KEF are no longer in production for donkey years, otherwise I buy one pellet off from Martin and sell them in ebay.


Offline Audio

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Akyah, no need to be amazed in what I said, I just answer the question from a technical point of view.

Did I say anything about SOUNDING BETTER?  All I said is that lower the impedance , the easier to drive.

I own a pair of Roger LS3 /5A in the 80s and I know what's it like.  Keep clipping the speaker, yes, sounded good but not on everything and always clip when pressed hard.  Poor B110 woofer!!  Not the speakers'fault, but being 16 ohms, it is difficult to make it sound loud.

So, natually my next speaker back then was the Kef Reference 104 Mark II....6 ohms, easy to crank up the volume and blast!!

(Audio)


Offline GAGA@echoloft

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Akyah, no need to be amazed in what I said, I just answer the question from a technical point of view.

Did I say anything about SOUNDING BETTER?  All I said is that lower the impedance , the easier to drive.

I own a pair of Roger LS3 /5A in the 80s and I know what's it like.  Keep clipping the speaker, yes, sounded good but not on everything and always clip when pressed hard.  Poor B110 woofer!!  Not the speakers'fault, but being 16 ohms, it is difficult to make it sound loud.

So, natually my next speaker back then was the Kef Reference 104 Mark II....6 ohms, easy to crank up the volume and blast!!

(Audio)



if u have not realised, i am also asking from the technical point of view. nothing to do with sounding better or worse. So tell me, why do u say eg. 16 ohm speakers are 'more difficult' to drive than say a pair of 4 ohm ones. I am not amazed by what u said - just surprised by the principle u mentioned. Care to enlighten me from the technical point of view?
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Offline Audio

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OK....

Say an good modern power amplifer with good current rating is outputting a 10V peak-to-peak sine wave signal.

If both speakers' efficiencies are the same, the lower impedance speaker will produce a louder volume, because of the lower impedance, it draws a higher current and dissipate a higher power.

Another thing, to make the higher impedance speaker sounds louder, you need to increase the voltage swing of the power amp's output and in doing so, your amp will clip first with the higher impedance speaker than with the lower impedance one. 

So, with lower impedance speaker, for all things equal, you have a louder volume and you will be able to make better use of the voltage swing that are available to you from your amp than with a high impedance speaker.

Logical?  (Flame suit on....)   :)

(Audio)

This is a real life situation, I always enjoy my Rogers LS3/5A but when I up the volume, it often clipped before I reach the desired shiokness.  I actually damaged one of the B110 due to overheating the resin at the voice coil.  Dammn hard speaker to drive...get them repaired at Atlas Sound.  I have no problem when I got the KEF using the same power amps.
« Last Edit: May 28, 2013, 17:12 by Audio »

Offline Audio

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Same thing with headphones.......

All the 16 ohms headphones are easy to drive, iPad, iPod, Iphone or smartphone can drive them to be deafing loud.....try doing the same for a 300 ohm HD-800 headphone.

(Audio)

Offline flowerpot

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actually lower ohm is harder to drive...

Offline Audio

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actually lower ohm is harder to drive...

Not when you are comparing a 15 ohm speakers with a 11 ohm speaker.

With modern amps, it's actually no issue driving 4 ohms speakers.......

It only gets more difficult when you starting approaching as low as 1 to half ohm.......   :)

(Audio)

Offline malsound

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Sorry for take this a little off channel, I have heard with first ear experience with 2 model of AVG horn 18ohm Omega series with Airtight 211 and 300B before 8 ohm and after tapping to 16 ohm. In both cases 16 tap win by a ang moh nose, one longer than the other. ;D

Everything sound calmer, more compose. Not that it sound confusing in the first place. Not sure the same can be heard with the 15ohm 35a  but I do remember some old amp like audio innovation has a 15 ohm tap.