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Does anyone have experience with the Kef LS50? - Page 14

post #196 of 206

Do I need a new power amp for these, or is my AVR sufficient?

 

Longtime headphone user who is doing my first speaker setup.

 

Just ordered the LS50s.  Wondering whether my AV Receiver has enough juice to run these properly as 2.0 or if I need to get a new power amp to put in the chain.  They will be used in a room that's 11x14' at moderate volume. 

 

Can you guys give me some input?  

 

Here are the AVR details:

 

Yamaha RXV775WA

Published materials provide the following, but as you know, not all watts are equal, which is my issue here.

90W per channel (8 ohms, 20Hz-20KHZ, .09 THD, 2 channels) 

Dynamic = 250w (2 ohms), 210 (4 ohms) 180 (six ohms) 140 (eight ohms)

 

Thanks,

 

Ryan

post #197 of 206

Your AVR is sufficient.

post #198 of 206
Quote:
Originally Posted by Rhinomyte76 View Post
 

Do I need a new power amp for these, or is my AVR sufficient?

 

Warning: Spoiler! (Click to show)

Longtime headphone user who is doing my first speaker setup.

 

Just ordered the LS50s.  Wondering whether my AV Receiver has enough juice to run these properly as 2.0 or if I need to get a new power amp to put in the chain.  They will be used in a room that's 11x14' at moderate volume. 

 

Can you guys give me some input?  

 

Here are the AVR details:

 

Yamaha RXV775WA

Published materials provide the following, but as you know, not all watts are equal, which is my issue here.

90W per channel (8 ohms, 20Hz-20KHZ, .09 THD, 2 channels) 

Dynamic = 250w (2 ohms), 210 (4 ohms) 180 (six ohms) 140 (eight ohms)

 

Thanks,

 

Ryan

 
 

 

The AVR should have sufficient power though Yamaha's specs are usually very optimistically rated. Whether it going to sound anything decent is another? I have found Yamaha AVRs to be a bit thin sounding when it comes down to stereo which definitely comes down to the internal amplifiers, but as a processor and pre-amp they usually do a good job. An external power amp might give you a bit of a warmer and full bodied sound. If it was my money I would try out the NAD T748 first. I bought my LS50s based on a demo running on NAD amplification and it is a great combination.


Edited by daerron - 7/14/14 at 10:41pm
post #199 of 206

Thanks for the info guys. 

 

In terms of optimizing the sound in the NAD power amp context, would this work well?

 

 

Source material ---> Yamaha AVR, using pure direct feature + pre-out ---->  older NAD 2200 Power Amp  -----> LS50s

 

Also, what would you say is a reasonable price for a used NAD 2200 that is a little older?

 

Really appreciate your feedback.

 

Thanks.

post #200 of 206
Quote:
Originally Posted by Rhinomyte76 View Post
 

Thanks for the info guys. 

 

In terms of optimizing the sound in the NAD power amp context, would this work well?

 

 

Source material ---> Yamaha AVR, using pure direct feature + pre-out ---->  older NAD 2200 Power Amp  -----> LS50s

 

Also, what would you say is a reasonable price for a used NAD 2200 that is a little older?

 

Really appreciate your feedback.

 

Thanks.

 

This really seems like a redundant setup. The LS50s are small speakers with realistic dynamic limitations, you're not going to get more out of them with a NAD than the Yamy. At louder volumes they'll begin to distort regardless of amp, as will all 5" woofers playing fullrange signals. Your AVR will take the LS50 up to KEF's stated 105db limit without a problem. As for Yamaha AVRs being cold - I would take that as one person's opinion of one experience with one model, not necessarily fact.

post #201 of 206

just got my unison research simply italy amp for them.... amazing :D

post #202 of 206
Quote:
Originally Posted by LifeAspect View Post
 

just got my unison research simply italy amp for them.... amazing :D


I heard this amp with the Dali Ikon 5 Mk2 and it is a brilliant little valve amp. Sure it must sound great with the LS50!

post #203 of 206

it complements the ls50s well, gives them more bass than with the roksan amp


Edited by LifeAspect - 12/10/14 at 6:33am
post #204 of 206

May be of some use to people when it comes to thinking about how you amp them:

#442

 

Quote:
 The LS50s were reviewed in Australian Hi-Fi Magazine, Jan/Feb 2013 (found at this link KEF LS50 Review and Test).

The test results noted that the LS50s had an efficiency of only 84 dB, and that "The impedance graph shows that if KEF were to follow the IEC guidelines for stating nominal impedance, it would have to put it at ‘nominally’ 4Ω rather than the 8Ω it claims."

Taken together, it would seem that the LS50s are a moderately difficult speaker to drive, in that an amplifier with both good power output (rated at say 80 WRMS plus into 8 ohms), together with decent current capability into low impedance loads, would be required to have the speakers give of their best. This would be particularly so at louder listening levels, otherwiset amplifier clipping might become a bit of a problem and degrade the sound quality. No flea-powered amps allowed for these speakers!
post #205 of 206
They definitely need power. The difference between a Brio-R and a Yamaha A-S2000 was dramatic.
post #206 of 206
Quote:
Originally Posted by proglife View Post

They definitely need power. The difference between a Brio-R and a Yamaha A-S2000 was dramatic.

 

The Brio-R is a nice amp though, it has a little bit of a bass boost that works with the LS50s, but it is short on power. The LS50s are finicky about partnering electronics.

 

I have since replaced my KEF LS50s and with KEF R500s floor standing speakers. Ironically I think the R500s takes up less space in my room. They work better for classical music and movies and I love the low distortion throughout.

 

The guy I sold my LS50s to has the Roksan Kandy 2 and is very happy with them and the amplifier combination.

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