Krell Adds Automatic Room Equalization System to Evolution 707 - Page 3

jdandy · #21 (**permalink**) 03-31-2010, 12:56 AM

What I find interesting about opinions is they are always open to dispute. It matters not who the originator is, an opinion is a judgment that an individual holds as true. That an opinion is held as true does not necessarily mean it is the truth.

PHC1 · #22 (**permalink**) 03-31-2010, 12:59 AM

Quote:

Originally Posted by Uberbrown

+1

Also..
The Evo 600's were highly praised by Stereophile, and Ken Kessler loved them as well, saying that they were the first piece of gear in a long time that had given him chills. He said...

Krell Evolution 600 Mono Power Amplifier Reviewed

That review reminded me how much I lusted over the smallest and the most gorgeous sounding Krell made once, the KSA-50s, a 50w gem. Never could afford it back then and never had a chance to buy it used.

PHC1 · #23 (**permalink**) 03-31-2010, 01:05 AM

While ultimately not my ideal pairing, listening to Wilson Alexandria X2v2 driven by Krell Evo 900s was an eye opening experience to say the least.

1KW · #24 (**permalink**) 03-31-2010, 08:58 AM

Serge,

Krell may be the way for you to go in your home theater. You will have plenty of power, amps. that won't heat up your gear cabinet as much as the Lamm and it will take care of the issue of having similar power to all the speakers since they make a multichannel amp. It also helps that HI FI house is a dealer.

Uberbrown · #25 (**permalink**) 03-31-2010, 09:25 AM

Quote:

Originally Posted by 1KW

You will have plenty of power, amps. that won't heat up your gear cabinet as much as the Lamm...

Ummm...Krell amps put out so much heat that their btu output is listed on the specs.

Uberbrown · #26 (**permalink**) 03-31-2010, 09:26 AM

Quote:

Originally Posted by Masterlu

Pretty limited clietele at that rarefied level.

That level is where you thrive!

PHC1 · #27 (**permalink**) 03-31-2010, 06:04 PM

Quote:

Originally Posted by 1KW

Serge,

Krell may be the way for you to go in your home theater. You will have plenty of power, amps. that won't heat up your gear cabinet as much as the Lamm and it will take care of the issue of having similar power to all the speakers since they make a multichannel amp. It also helps that HI FI house is a dealer.

Krell also runs plenty hot... If I was going with an all Sonus Faber theater setup, I actually would. The Elipsa/Krell is something I've always found to be very enjoyable.

1KW · #28 (**permalink**) 03-31-2010, 09:23 PM

I did not know Krell runs hot. My MC252, MC501's and yes the MC207 all run cool no matter how long I have them on or how hard I drive them. Do you see going back to Mcintosh as going backward Serge ?

PHC1 · #29 (**permalink**) 03-31-2010, 10:24 PM

Quote:

Originally Posted by 1KW

I did not know Krell runs hot. My MC252, MC501's and yes the MC207 all run cool no matter how long I have them on or how hard I drive them. Do you see going back to Mcintosh as going backward Serge ?

David, Krell is very differently built from Mcintosh. A 400w evo 402 will also give you 1600w into 2 ohms, uses very little negative feedback, has enormous power supply and beefy voltage rails as well as their own innovative circuit topology. The active biasing ensures the output transistors are operating linearly and in their optimal thermal/output zone but it does run a bit hotter. it is also an extremely wide bandwith amp with linearity into 300MHZ range.

The MC501s and other McAmps run cooler but when pushed can go into thermal shutdown as stereophile discovered in their 1/3 power pre-conditioning test with 501s. A typical user will not encounter those conditions though when listening to music. Yes, Krell is built differently, it is a brute into lower impedance loads and grabs any speaker by the b@lls but synergy is a bit more challenging.

Do I think McIntosh is a step back? Depends... Very neutral or leaner speakers can benefit from the more forgiving McAmps. The truly refined and balanced speakers can use the extra resolution.

jdandy · #30 (**permalink**) 03-31-2010, 10:51 PM

David.......Another way to look at it, McIntosh is very differently built from Krell, and runs considerably cooler by design. Their large power supplies are more than capable of delivering all the power necessary to operate faithfully at publish specifications with long term reliability. Negative feedback is a common engineering technique to reduce output distortion, included in Krell amps, as well. McIntosh specifications, which are worse case numbers, clearly demonstrate the success of the McIntosh circuitry. Active biasing can insure linearity of output transistors, providing the very complicated active bias circuitry remains stable and within specification. Some McIntosh amplifiers use active biasing, but it is designed into the transistor itself, and is called Thermaltrak. These types of transistors monitor their own heat, and self bias automatically without resorting to complicated external active bias circuitry. Yes, McIntosh amplifiers are built differently, and are quite capable of grabbing speakers anywhere they need to be grabbed to perform there best, and work wonderfully on truly refined and balanced speakers capable of the utmost in resolution.

There are many flavors of Kool-Aid. One can drink from whichever ice cold picther he chooses and find happiness.

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