Guest review of the Krell FPB 700cx by Nate K.

It was a puzzling realization when it occurred to me that my speakers and amp cost almost as much as the rest of my system. Since I have been a proponent of starting at the source and working back, I expect to take some abuse. Although I might argue that I wasn’t starting, I was upgrading my weakest link. I didn’t think that would work.

krell-FPB-700-CX amp

Krell FPB-700-CX

I have owned four pieces of Krell gear over the last several years and have been happy with each of them in their time. I guess many readers tuned out after that sentence. I had two pre-amps, and I am now on my second amp. I started with the Full Power Balanced series so I can’t really address the “Krell Sound” issue of the earlier amplifiers.

The Krell FPB 700cx is currently the top-of-the-line stereo amp in the Class A series. They do have another series which, if you can believe it is much more expensive and supposedly, much better.

The first surprise I experienced was lifting the amp out of the shipping truck, and into my truck. It is a job for one large strong person or two people of average size. With the shipping box, the 700cx weighs in at 200 lbs. My son was less than excited at the prospect of helping me wrestle it into the basement listening room. This was not to be my last surprise.

The shipping material is very good, and Krell designed to amp to be easily removed from the carton. Okay, as easily as any 180-lb. amp can be removed. Keanen and I wrestled this monster out of the box and into position between the speakers. The power cord is semi-permanent so it is still in place. I connected the amp to the system via a 9-meter pair of Purist Venustus balanced interconnects.

Cosmetically the FPB 700cx is much different than the FPB 200. The face of the amp in no longer flat as it has been since Krell released their first product. The amp looks much nicer, and can I say, more expensive.

The entire line was redone cosmetically when the CAST series was developed. Since I do not use a KCT pre-amp, I cannot use the CAST technology, but my understanding is that it works very well when transferring the signal in the current mode.

I know that no amp is going to be anywhere near peak performance right out of the box, but who among us has ever started running pink noise, or a burn-in CD without listening first? Oh you liar! The amp had obvious potential. Soundstage was small, and lacking in inner detail and clarity, bass and treble were both thin, and rolled off, but it still sounded pretty reasonable. For the next three days, I alternated between brief listening sessions and running the new Purist Burn-in CD 24 hours a day. Purist claims that the new CD works twice as fast as the older model, and based on what I heard after three days I would have to agree with their claims.

On Saturday, four days after the amp arrived several friends and a couple of acquaintances arrived for a ‘listening session.’ We are trying to organize a Northeast Wisconsin Audiophile Society, but that’s another thread! Comments began to flow almost immediately. The first was, “This wine is a little too sweet for my taste.” He was right; the wine wasn’t very good, so we moved on to another bottle. People seemed to settle down after that. We took turns listening to the music people had brought with them.

Greg who has heard my system a lot of times was suitably impressed. He even commented that he heard things that he did not hear at home. Other things mentioned were the increase in soundstage size, and detail, but everyone seemed to come back to the increase in the bass level. Since I had not had much time to listen on my own yet, I did not argue with their assessments.

Over the next few days, I formed my own opinions, but they did not differ much from what my friends had said, although I think they are more in-depth than what had been said during that session.

Upgrading from an FPB 200 to the 700cx doesn’t seem like it should be as dramatic as it turned out. The 700cx isn’t just bigger and heavier, it is completely different. Sure the bass goes a lot lower, and is considerably more fleshed out, but there is a lot more than just that. The midrange is so clear that sounds and images seem to float out of the speaker rather than being driven.

krell-FPB-700-CX amp

The Krell/Kharma’s do not have the most liquid midrange I have ever heard. That award went to a pair of Revel Studios being driven by Levinson electronics. I still would not trade the Revel/Levinson combo for my Krell/Kharma since the latter just does too many things right, or better than the former.

Krell has been accused of making bass-heavy and overly bright-sounding amps in the past. I did not hear any of that in my room. The treble was grain free and smooth, never shrill. I have yet to turn the system off because I found it fatiguing. I have to admit I have been resentful of other priorities that forced me to stop listening when I still wanted to spin just one more LP.

My biggest priorities when listening are ‘pure midrange’ and a palpable soundstage. I will give up the lowest bass registers to get a better midrange and a solid soundstage. The Krell offered me not only great bass, and smooth treble, but the midrange I demand, and soundstage with height, depth, and width, full of detail and air.

One of the first LPs I used after the amp had been running for a reasonable period, was the new Norah Jones on 180-gram vinyl. When she began singing “Sunrise” I had the idea that there was air in front of her, and behind. She was singing in a definable space rather than just floating somewhere between the speakers. I joked to Greg later on the phone that I could almost tell what color dress she was wearing.

Driving in neutral
The 700cx has less sonic signature than any piece of electronics gear I have ever owned. I hear more of the source, and less of the amp, than I did with the FPB 200. For those who have written off Krell equipment because of the claims of others, or even experience with the ‘Krell Sound’ you really need to listen to this amp. It is unlike anything I have ever heard. I have had my Sota Star Sapphire/Rega RB 900/Benz Glider, and my Sony SCD 777es for a number of years. I have always been happy with them. Since adding the Krell FPB 700cx, I can’t help but wonder what better sources might sound like in my room.

I am self-employed and anything but wealthy. I save up money to buy my stereo equipment. If I don’t have cash the purchase doesn’t happen. I did borrow money to buy my speakers though, but anyway… The Krell FPB 700cx costs $14,000. I paid $50,000 for my first house, for cryin’ out loud!!! Is the amp worth what I paid? In a word, yes. Any purchase is going to be a personal thing, and there are going to be even more people who think I’m stupid after reading this review than there were before, but this amp does so many things so well that it demands attention. That kind of quality costs money to build.

So you have one of two choices: either start saving or start arguing!

Nate 08/17/04

Editor’s Note –

Nate’s amp turned up many years later in my listening room in Sturgeon Bay WI! – Nate sold the amp to his brother-in-law Greg, who, for some reason only he could tell you, brought it around to my place one day and left it there!

Also, added in June 2023, check out a review of the Krell KSA 80


Talon Khite