Krell Duo 300 compared to Evo 302e or 402e?


Hi I am looking for an amp to power some Revel Salon 2s and wondering about these amps. From all I can read it seems that the 302e or 402e would be a good amp for the Salon 2s but the new Duo 300 with it's cooler running demeanor is definitely appealing. I am wondering if anyone out there has compared these or owned both and can shed some light on this?
ejlif
With only 1 week, I have found the Duo to sound like a Class A amp.
Much more musical than any previous Krell amp.
@ Ajpk1971, Hi, This is the very first any thing on the new Krell Duo 300 on audiogon I have seen, Do you own one, or you listened to one?, I really do not care about most pro reviews, I find them very mis-leading these days!, User reviews to me are more realistic, not getting paid,are more usefull to me, they are closer to valid that I know of, cheers.
I got a Duo 300 only problem is it came not working and has to be replaced. I'm glad to hear you are thinking it sounds musical and more like a class A amp than previous Krell. This is exactly what I'm looking for. Class A without all the energy drain and heat. I'll jump back on here and post some thoughts about mine when I get the new one.
I look forward to a detailed review from you Ejlif, cheers.
I had to return my Duo-300 to Krell for a defective power supply.
Literally within days I had a new amp.
And have been happy ever since.

Krell bass and smooth mids and highs.
The best sound thru frequency range of any Krell I have owned.
@ Ajpk1971, what krell amps have you owned?
I'm still waiting for my Duo 300 to be sorted out. Seems like they are having issues getting parts for these. I am supposed to be getting another new one but we are getting into the 6th week. I'm glad to hear you are enjoying your Duo 300. What have you compared it to?
I've heard of inital problems with the new amp design and/or parts. That being said, I'm listening to one of the matching preamps right now, an Illusion II and it is fabulous. Very sweet, dynamic and great PRAT. The aesthetic design and execution is a bit different, admitedly, but the sonics are superior to the Evo series thus far.
Again, I ask, what krell amps have any of you here have owned you are compairing the Duo 300 to?
15 years ago, I believe it was a KSA 100.
Then an FPB 250 with KCT.
Then 302e.
Now the Duo 300.

Still very happy.
@ Ajpk1971,mmm, guess you thought maybe I would not check this thread again, thankyou all the same, all that you listed is no where in the league of the krell amps I own or listened too, cheers
Audiolabyrinth,
Please tell us, what Krell amps have you owned or listened to that are so much better than those listed by Ajpk? The Krell Evo 302E is a very good amp. Not quite as good as their Evo E series mono blocks, but still excellent.
I have a modded Krell 700 CX right now, you should hear what this amp is doing, very incredible, way, way better than a stock 700cx and 302E, I have listened to the 302E many, many times, never owned one, I have owned or listened to alot other krells over the years,I had the Krell company them selfs do a complete re-build of the inside of my Krell 700cx with all new stock cosmetics to make the amp new looking along with the inside, Krell inserted all kinds of parts inside the amp to make it work with the capacitors that were not stock inside this amp when it was made in 2005, you should see the bag of parts they sent back with the amp that I requested, Huge bag of parts, I was supprised, this costed alot of money to do this, I will keep this amp likly the rest of my life to get my money back out of it, not saying I will not have or get another amp one day, it's just not feasable to sale this at a big loss in money that I have tied up in the amp, cheers.
Hello Audiolabyrinth,

Would you please share your impressions of the build quality and sound of the krell 302e?

By any chance have you ever listened to a Musical Fidelity AMS-50?

I ask because these two power amplifiers are on my short list to audition.

Many Thanks
07-21-14: Audiolabyrinth
I have a modded Krell 700 CX right now, you should hear what this amp is doing, very incredible, way, way better than a stock 700cx and 302E, I have listened to the 302E many, many times, never owned one, I have owned or listened to alot other krells over the years,I had the Krell company them selfs do a complete re-build of the inside of my Krell 700cx with all new stock cosmetics to make the amp new looking along with the inside, Krell inserted all kinds of parts inside the amp to make it work with the capacitors that were not stock inside this amp when it was made in 2005, you should see the bag of parts they sent back with the amp that I requested, Huge bag of parts, I was supprised, this costed alot of money to do this, I will keep this amp likly the rest of my life to get my money back out of it, not saying I will not have or get another amp one day, it's just not feasable to sale this at a big loss in money that I have tied up in the amp, cheers.
They replaced some of the parts in your 700 CX with current production parts, so how can you conclude it's out of this league superior to all Krells? At best, it's closer to current production models.
Hi Joecasey, I'm not sure if the modded krell 700cx I have is the best Krell ever, likly NOT, you are correct, Krell likly inserted parts and caps that are inside the brand new amps that they are selling now in my amp, then that is where you draw the line, The Krell 700cx has two huge transformers, essentially two of everything, a mono block amp in one chassis, my amp can handle 1 ohm speaker loads with ease where all the new krell amps cannot go less than 4 ohm loads of speakers, I know this to be a fact, Krell themselfs told me that information, the specs are also far greater in my amp compaired to the new krell amps as well too, my amp is a true balanced design-no RCA connections what so ever, any amp that has RCA and balanced and cast is NOT a true 100% balanced amp, I only have cast and Balanced period., the signal to noise ratio in my amp is 120 DB, the 700 cx is also more complex, The transformer uf specs is far and away greater than all the new Krell amps meaning with my exsperience can play lowest volume setting and still get the total full sound, at the end, it is really your voicing preferance, The evolution E series sounds different than the cx series, I do imagine the new amps sound closer to what I own, since that is krell's goal to go back to class A sound, however, I did live with a stock 700cx for two years, I assure you the sound now is alot better than before now that the amp is modded, I am happy, thrilled with the out come, cheers.
I also wanted to add, when and if I get another amp, I will stick to the sound I have, meaning, I will obtain a Dan D Agistino amp, The new intergrated amp looks very good if that is what any one wants, in my mind, the krell cx amps was Dans last he soley developed by himself, and the heritage carried onto his new company, The Dan D agistino audio.
Anyone care to share their listening impressions of the Krell 302e?

Many Thanks.
Recently went from 302e to Duo 300.
Seems like Krell wants to move to a tube like sound.
Warm but detailed.
Very musical.
Not fatiguing.
makes 302e sound to the cold side.
Great observation Ajpk1971, THAT IS WHY I WENT WITH A MODDED kRELL 700CX versus the 302E amp, I admitt, now you have got my curiosity stirred about the New krell amps, they are priced fair compaired to others out there, congrats on your New Duo 300, did you get to listen to the mono blocks?
I have heard of initial reliability problems with Krell's newest amplifier design. Has anyone else heard the same?

Many Thanks
I just got a Duo 300 for home demo. It certainly adds texture and makes the music more engaging. But, I like the exact, analytical nature of my 400e (and former 302e), so, Duo sounds a bit too colored. The evolution series seems to have more control of the bottom end than Duo. I need to listen and compare a bit more. Maybe it needs some burn in time to tighten up the sound.
By the way, I thought it was odd that hot air blows out through the top. I don't know if anyone would want to put anything on top of Duo as Krell suggested it can be done.
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Since its introduction, Krell adjusted Vanguard retail price to $4,500. So, it is not as a strong bargain as it seemed initially...
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I finally got my Duo 300 back (about 6 weeks ago) It's a great sounding amp. I think the other guy has the sound well described. I've only ever had a Krell s300i so I don't know how the Duo 300 compares to the likes of the 302e and such. I am running mine with Revel Salon 2s in a recording studio situation. One problem for me is the fans on the Duo 300 are often times kicking in. If I'm really blasting the music the fans can be unbelievably loud. This is pretty annoying at times. I asked Krell and they told me to plug it into a ethernet port which is kind of a pain for me as I don't have one near my studio. I would have to get a 100' cord and run it through a wall but I may do that to see if there is something wrong with my Duo 300 that the fan comes on so loud. It's a well made amp just a basic black box but good quality, the binding posts are nice they tighten easily they are the best I've ever used. The sound of the Duo 300 is very nice and nothing to complain about as far as sound goes I would just warn of the whole fan noise thing. Who knows maybe it's possible to set the fans to run less. I would be Ok with a little more heat and less fan noise.
I have the same speakers. Salon 2s are absolute current pigs and your amp is pretty light in that department with only 17 amps peak output, so I'm not surprised it heats up enough for the fans to come on when you are cranking the tunes.

By way of comparison, I went from a Plinius SB-301 stereo that could do 100 amps peak to Symphonic Line Kraft 250 monos that have even more current. I think I read somewhere they can do 150+ amps peak; although the manufacturer doesn't provide a number for them one of their lighter models pushes out 120 amps peak. In any event, they look like a late 60s muscle car under the hood and have lots of current to tap.

The Plinius had huge heat sinks and dissipated heat that way rather than through fans. It would run quite hot even though it was Class A/B, but the Symphonic Line amps don't even break a sweat at utterly ridiculous volumes, i.e. in excess of 115dB peaks.
Ejif, The reason Krell told you to connect an earthnet cord to your amp is for them to evaluate your amp on their main server their at the factory, believe it or not, your amp is computer oriented, Krell can and will literally make ajustments to your amp if the fans are working out of the ordinary with the speed and sound of the fans, I would hook the amp up inside the house to the connection,you would have to be useing the amp at full campacity when you do this, call krell on the phone, and see what they do with their main server for your amp, it's like essentially your krell in the krell shop without ever leaving your house,and the connection tells krell if there is a problem that you have to send the amp to them for work done to the amp as well, Awsome to me!
So if an amp can put out 100+ amp peak output then how does a typical 20 amp circuit respond to something like that?
I don't know how a 20 amp circuit would work. My monos are on separate dedicated 30 amp 240V circuits.

I'm also guessing that an amplifier's peak output is based in part upon the capacitors' ability to store electrical energy, but I am no electrical engineer...

ha,ha,That's a good question Ejif, +1 on this one.
Peak amplifier output current does not have to be less than the current of the circuit powering the amp. This is because power is equal to voltage times current, and since the line voltage (i.e. 120V or 240V) is in most cases higher than the amplifier output voltage more current can often be available at the output terminals to drive speakers.
Bill_k, great explaination.
I have the Krell Vanguard and my fans did go off in the summer but it's been all quiet ever since. It's smooth and very open sounding. The new Vanguard kind of reminds me of the Sim Audio I7 but less clinical sounding probably due to the class A design. They both have a lot of steps with the volume control.
If you like the Krell sound the new gear doesn't disappoint. Looks are just OK.
Thankyou Gold for your response here, the new krell equipment is still getting circulated to the users to give their opinions on the forum sites, give us more when you can, cheers.
Anyone hear the new Mono Solo's?
I've purchased a Krell Vanguard with the digital module direct from Krell. When I try to use the Blootooth it constantly drops out. I sent it back to Krell gone for a month and back in time for Thanksgiving. Alas it sadly has the same issue as before. 
  I gave up my Krell 302 and Phantom III preamp to purchase it so the entire family could enjoy the Krell. 
  Biggest mistake and the last. All I hear now is the wife completely gripping about the Bluetooth.   Cheap inputs on the back so high priced interconnects not needed. 
Coinguy37 is a Troll....Krell does not sell direct.

Hi WorldCat,

I have spent lots of time with the Solo 575 mono block amplifiers. They immediately sounded better than the EV403e I was running previously. Much larger soundstage, noticeably more speed (hits on a high-hat, fast guitar, etc.), even more tautness to the bass (even compared to EV900e mono amps), and they are just far less harsh than any of the EVO amps. They also run cool, and the fans are very quiet. There is one scenario where you can hear the fans, if you playing something at high volume, and then all of a sudden you hit pause, or the song abruptly stops, there is a ~1 sec, quick ramp down of the fans that you hear as a whoosh. It's never noticeable at any volume you are playing. And they are silent when you are in your listening position and they are idling. They only require 2 inches of clearance above them too. Most importantly they are just the best sounding Krell's ever. I'm a Krell dealer, but I'm just as critical, as I too am a user. iBias is a big step forward. Hope that helps.

-Brian

PS I have a video/text of the EV402e vs Solo 575, same track, same volume, same everything. Even with an iPhone and it's crappy mic/speakers you can hear the difference clearly. Way better dynamics, transparency, everything with the Solo 575.  Krell has moved forward. 

Dave b, krell does not sale direct, wrong again,  I bet you system to system that they do,  they have for a long time now! 
Coinguy37, I apologize on behalf of the Community here for Dave b's remark's,,, you are no troll,  you actually told the truth,  krell has been selling directly for atleast the last 3 years I know of,  however,  they will not sale direct if you have a krell dealer in your area that you live.