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KEF LS50 - for David@FrankHarvey

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John Duncan's picture
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Notwithstanding all that nonsense in the other (now locked) thread, did you get to hear them?

Note to all - if you want to talk about active crossovers, start your own thread.

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RE: KEF LS50 - for David@FrankHarvey

Hi John

I am looking forward to his impressions of the LS50's.

All the best

Rick @ Musicraft

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RE: KEF LS50 - for David@FrankHarvey

Comedy gold!!!

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RE: KEF LS50 - for David@FrankHarvey

When reading the KEF LS50 and R100 specs, I noticed their impedance both dip to 3.2 Ohms.

Looking at some other small (nominally 8 Ohm) speakers, they don't dip anything like as much. (Spendor SA1 minimum 6.3 Ohms, Spendor S3/5R2 minimum 6.2 Ohms, PMC DB1i minimum 6.3 Ohms, MA GX50 minimum 4.85 Ohms).

Is it right to say the 3.2 Ohm minimum impedance figure suggests quite a challenging load?

 

 

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RE: KEF LS50 - for David@FrankHarvey

chebby wrote:

When reading the KEF LS50 and R100 specs, I noticed their impedance both dip to 3.2 Ohms.

Looking at some other small (nominally 8 Ohm) speakers, they don't dip anything like as much. (Spendor SA1 minimum 6.3 Ohms, Spendor S3/5R2 minimum 6.2 Ohms, PMC DB1i minimum 6.3 Ohms, MA GX50 minimum 4.85 Ohms).

Is it right to say the 3.2 Ohm minimum impedance figure suggests quite a challenging load?

 

 

That is low and certainly would imply a difficult load. As for 'challenging' it is all relative. I certainly would not like to drive them with a 12watt single-ended
valve amp! They should be listed as 4ohm nominal speakers.

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RE: KEF LS50 - for David@FrankHarvey

Kef should really rate these speakers as 4 ohm nominal!  A speakers minimum impedance really should be not much lower than 8/10 its nominal figure.  

So for a 8ohm  nominal speaker the minimum should be no lower than 6.4 ohms. 

A 4ohm nominal speaker should not drop much below 3.2 ohms.

 

It also depends how reactive they are and whether there is a large phase shift around the minimum impedance.

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RE: KEF LS50 - for David@FrankHarvey

excellent! @LHC

chebby wrote:
When reading the KEF LS50 and R100 specs, I noticed their impedance both dip to 3.2 Ohms.

Looking at some other small (nominally 8 Ohm) speakers, they don't dip anything like as much. (Spendor SA1 minimum 6.3 Ohms, Spendor S3/5R2 minimum 6.2 Ohms, PMC DB1i minimum 6.3 Ohms, MA GX50 minimum 4.85 Ohms).

Is it right to say the 3.2 Ohm minimum impedance figure suggests quite a challenging load?

I didn't get a chance to try a much better amp (will do when they come in for demo), but the Nait XS and Audiolab 8200P power amp drove them fine. Most of my listening was done on an 8200CDQ CD pre and 8200P power amp system.

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RE: KEF LS50 - for David@FrankHarvey

FWIW, the KEF speakers were being driven by the Arcam A38 amp in the Munich show demo last week.

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RE: KEF LS50 - for David@FrankHarvey
I certainly did! I didn't get quite as much time as I'd have liked with them, but I will do soon.
The LS50 sound isn't the sort of sound thats going to be instantly impressive. The presentation of these is something you have to listen to and adjust to for a while, a little like ATC, as many people will not be used to this sort of sound because many speakers out there are far from neutral.
They're quite weighty little things, and "knocking" the cabinet like a door produces nothing more than a totally dead sound as though they're solid through and through. In fact, I'd say that they're just as well built, if not slightly better (due to their size), than the Reference series in this respect. At least you know the cabinet is having no effect on the end result...
I played quite a few different tracks, some on the Naim ND5XS/Naim Nait XS, but mostly on the Audiolab 8200CDQ/8200P. As I did with the Concept Blade when I first heard them, I could appreciate what they were NOT doing. I don't think many people looked at the Concept Blade in that context, they were just treating it as another speaker and were expecting to be wowed because they were expensive. Nothing wrong in that, but these sorts of speakers need a slightly different approach when listening, I think.
Straight away you can tell that there's no "bloom" to the midrange. It's clean, revealing, and lacking the warmth that shouldn't be there. I tried them with the bungs out - it'll be interesting to try them with the bungs in, as this should only affect the bass depth, and not the tonal balance of the LS50 due to it's design. Stereophonics' Mr.Writer, which isn't the best recorded track and can be quite muddled sounding, you can hear a lot of detail in what was going on, and I could hear the cymbal work more clearly, which sounded a little different than I've heard before on many speakers. Sneaker Pimps 6 Underground sounded nice. There's always lots of detail in overdubbed/sampled music which usually gets lost on bassy speakers, but it's all here. FNDMNTL's Serv It also sounded great, but in our demo room didn't quite hit the lower notes (like the lower note in 6 Underground), although I'll reserve judgement on the low bass until I can get a pair home and try them out properly in my own room, as my R300's at home are much clearer with better presence in the lower bass than the R300's in our demo room.

The Chili Peppers' Blood Sugar Sex Magic was sounding nice and tight, with nice weight to the kick drum, and with as much detail as I have heard on the snare drums (on more expensive speakers, I mean). The only boom I was hearing was our demo room, which isn't perfect. The first couple of tracks of the Atticus Ross/Trent Reznor Social Network soundtrack, whilst not having the scale and depth of the Blades, seemed just a detailed and energetic - the LS50 has even more in common with the Blades than the R series does.

I also think that the UniQ's benefit of it's wide dispersion and imaging is realised more fully with the LS50's, which I think is down to the fact that the cabinet is playing no part in the presented sound. Like the Blade cabinet, the front facia curves back from the driver, eliminating reflections that a flat front panel would normally introduce.

For AV, I like a lot of detail. Many hi-fi speakers don't cut it for me, but the R300's have been pretty amazing. Having recently tried out the Audiolab 8200AP in my system, they're sounding even better than ever, and have really opened up purely because of this processor. I could quite happily live with the current sound that I have. But after what I heard earlier, I need to get a pair of LS50's home and try them out directly against my R300's. As I mentioned earlier, I think time spent with these will reveal their true strengths, as they're not immediately apparent.

Music used:
Boards Of Canada - Music Has The Right To Children
FNDMNTL - Subduction
Red Hot Chili peppers - Blood Sugar Sex magic
Queens Of The Stone Age - No One Knows
Sneaker Pimps - Becoming X
Stereophonics - Just Enough Education To Perform
Trent Reznor/Atticus Ross - Social Network OST
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RE: KEF LS50 - for David@FrankHarvey

Apologies for the odd look - I think because I was shifting stuff around, copying and pasting, somethign weird has happened. I've edited it to put gaps inbetween paragraphs, but they're refusing to show up!

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RE: KEF LS50 - for David@FrankHarvey

So...... Active crossovers... What's the deal?puzzled

 

excellent! Wink excellent!

 

 

Sorry JDsilenced

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RE: KEF LS50 - for David@FrankHarvey

Big Chris wrote:

So...... Active crossovers... What's the deal?puzzled

 

excellent! Wink excellent!

Smile

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RE: KEF LS50 - for David@FrankHarvey

Big Chris wrote:

So...... Active crossovers... What's the deal?puzzled

 

excellent! Wink excellent!

 

                                               You''ll get your bottom smacked.! Passively of course. Smile

Sorry JDsilenced

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RE: KEF LS50 - for David@FrankHarvey

alchemist 1 wrote:

Big Chris wrote:

So...... Active crossovers... What's the deal?puzzled

 

excellent! Wink excellent!

 

                                               You''ll get your bottom smacked.! Passively of course. Smile

Sorry JDsilenced

 

Nah.. I've met JD in person...... I think I can take him.Smile

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RE: KEF LS50 - for David@FrankHarvey

FrankHarveyHiFi wrote:

Big Chris wrote:

So...... Active crossovers... What's the deal?puzzled

 

excellent! Wink excellent!

Smile

 

You should give one of those T-shirts away free with ever pair of KEF LS70 sold.

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RE: KEF LS50 - for David@FrankHarvey

FrankHarveyHiFi wrote:

Music used:
Boards Of Canada - Music Has The Right To Children
FNDMNTL - Subduction
Red Hot Chili peppers - Blood Sugar Sex magic
Queens Of The Stone Age - No One Knows
Sneaker Pimps - Becoming X
Stereophonics - Just Enough Education To Perform
Trent Reznor/Atticus Ross - Social Network OST

 

Whatever else you may be David, I applaud your taste in music. Particularly BoC, but I like everything on your list!!

edit...not heard FNDMNTL... which will hopefully be remedied with Spotify.

 

edit 2. That sounds a bit rude, it isn't supposed to be... Smile

 

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