Experience with Raul's Essential 3150


Here are my comments on the listening session I had with Raul and his Essential 3150 Full Function Preamplifier.

Firstly, I would like to thank Raul. He is a very knowledgeable and kind gentleman. He has years and years of experience in music and analog systems. My respect for him is in another league after his visit. Some times his post opinions may seem controversial, but I think he knows what he’s talking about. Remember. Respect your elders…they have more experience.

Raul and Jose’s preamp is a seriously built unit!!! It has a separate power supply and the total weight of the two units is close to 50lbs. Very heavy, well shielded frame. Raul opened up the preamp and pointed out the level and quality of the parts. Vishay resistors, V-Caps, etc. This preamp is completely solid state and made with the finest parts and the inside does not look garage shop at all. It is impressive looking. His design is fully balanced from input to output. It included 2 SE line inputs, 2 balanced line inputs and 2 sets of phono inputs, both SE and balanced. It has a separate left and right volume control as well. The preamp is 12 years in the making and uses some interesting proprietary techniques. According to Raul, the distortion and frequency linearity is orders of magnitude better than just about all the other equipment out there.

We compared the music we were hearing using either his preamp or my CAT Ultimate MkII preamp. Since I had to create space in my rack, I removed my CD player. Therefore, we only listened to my analog system. I wish this were not the case because it would also have been good to compare line stages.

We listened to a few records: Miles Davis-Kind of Blue, Sade-Stronger than Pride, Steve Miller-Fly Like an Eagle, Pink Floyd-Dark Side of the Moon, and various classical selections. The most clear and obvious differences were bass response, transparency/detail and sound staging.

Music with the Essential had INCREDIBLE bass and midbass. Much, much better than listening through the CAT. It is extended, articulate and not attenuated the least bit. This improved the fullness and impact of the presentation greatly. It is quite amazing that my Analog system has bass potential that I was not even getting close to with the CAT. This alone has me seriously considering buying his unit.

As you would expect from fine solid state, the music had fine detail and transparency was at a higher level than you would expect with tubes. In this regard it was better than the CAT. Due to the transparency, the soundstage depth and width was very apparent. Dynamics were also very good.

In the mids to highs, music through the CAT had a richer and more immediate quality. Brass sounded brassier with the CAT than through the Essential. In comparison, music through the Essential had a detailed but lean, soft and relaxed presentation compared to the CAT. It comes down to which is more correct, which has a coloration and what does one prefer. Also, the Essential has some trim pots that allow extension or attenuation of frequencies above 20KHz. Raul believes that this observation would have been ameliorated by extending the frequencies.

Through both preamps, we heard slightly tipped up high frequencies in my system that Raul believes is not a function of either preamp. The most likely culprit is the frequency balance of the speakers or room acoustics. Therefore, I may need to address this problem first. Nonetheless, you can’t go wrong with the Essential 3150. It really is like a tool.

The other thing I will try is replacing the tubes in the preamp. They are about two years old and have been used extensively. Ken Stevens from CAT believes that this will improve the level of the bass, articulation and transparency across the entire frequency range. It will be interesting to rehear some of the tracks we played after this. I also would like the chance to try the Essential for a week instead of the 5-6 hours we took as well as compare the line stage performance.

Overall, the Essential 3150 is a seriously good preamp and is probably better than most commercial solid state and tube units. If you have a chance, give it a try. In my case, I’ll first try addressing the speakers, seeing if the new tubes make a difference and hopefully spending more time with the unit.

Andrew
aoliviero
Dear Piedpiper: " cartridge floating ": pin 1 disconnected.

Regards and enjoy the music.
raul.
Dear friends: I already receive several e-mails asking for my opinion about other Phonolinepreamps out there and specially some of the ones that I had the opportunity to " meet " during the Essential 3150 roudtrip.

Like I posted somewhere the " objective/target " to visit all the AG people during my trip was not to challenge their Phonolipreamps but to know a different alternative, that's why ( with any of them ) we heard through the Essential 3150 with out come back to their Phonolinepreamp to make a
shoot-out/down.

Anyway, we have ( any people ) universal information ( through web sites, audio magazines and AG forum )about several Phonolinepreamps combinations ( including the Essential 3150 ). All these information is not " top secret ": is totally disclose, for example if we take the top of the top Aesthetix models ( the six chasis unit ) we can read this on the Phono unit ( alone ):

- that the signal goes through four stages and then through additional cables to the Aesthethix line preamp. This means six stages where the signal must pass.

- that the inverse RIAA eq. deviation between 20 to 20kHz is +,- 0.25 db, this means a swing of 0.5 db. ( the RIAA deviation means that the deviation in a precise frequency does not only affect that single frequency, because the RIAA is a curve, but almost three frequency octaves!!!!! ).

- signal to noise ratio: 70 db.

- output impedance 300/600: RCA/XLR ( the output impedance is of high importance because a figure like this tell us that the signal could loose its original integrity ).

- the Aesthethix are coupled through capacitors/transformers. This means that those units are not direct coupled and that the signal pass through capacitors/transformers.

- these designs are not fully balanced, its first stage ( the most important one ) is unbalanced ( the balance design has many advantages and one of them is that in a true fully balanced design the distortions/noise are cancelled ).

- I can't find any figure for distortion. I can't understand why is that.

Now, we can take info about any phonolinepreamp out there. If you want the Essential 3150:

- the signal goes through two stages and does not needs additional cables/connector because the Essential is an integral unit.

- its inverse RIAA eq. deviation from 20 to 20kHZ is: 0.015db. As a fact the Matthew unit goes with 0.009db.

- signal to noise ratio over 80db.

- output impedance: 75/150 Ohms

- direct coupled. The signal does not pass through any single capacitor/transformer.

- fully balanced input to output.

- distortion: 0.0002%

- frequency response: 0.01 to 1 Mhz.

These are only some subjects about differences ( facts ) in those two differnt unit but there are many other subjects and differences in both designs.

I reserve my opinion about the Essential 3150 quality sound reproduction against not only the Aesthethix one but about any other phonolinepreamp. This not belongs to my targets and I'm not the right person to do it because the Essential 3150 is an important part in the José and my life and we could have some bias in favor of the Essential 3150.
Regards and enjoy the music.
Raul.
My psychic mind tells me Albert Porter had a serious reality check...

Don't worry Albert, I'm sure Raoul will give you an *amigo* deal on the preamp!

Raoul, I'm happy for you...really.
First of all, Raul wanted me to listen to the Essential, not do a comparison between it and my Aesthetix.

We disconnected both of the Aesthetix units and set up the Essential before our listening session.

Aesthetix has been my reference for 7 years, Raul wanted the 3150 plus the rest of my system, so we were both OK with skipping the Aesthetix intro.

I judge only with my ears, not the numbers. The Essential is an excellent preamp-phono and although the specifications are impressive, that says nothing more about it's sound than the specifications of a Yamaha integrated or Boulder phono (both of these, typically a decimal point followed by multiple zeros as a distortion spec).

My psychic mind tells me Albert Porter had a serious reality check...

Psychicanimal, if that happened, I didn't realize it. Thanks for the update.

I hope to listen to the Essential again. Raul and I discussed that possibility and I offered to do some product photography as Raul has no professional images. At that time I could listen longer and in a relaxed mode and maybe even write a review at Positive Feedback. I can listen to a piece like this and rave about its merit, regardless if it qualifies as a replacement for my Aesthetix or not.

I think anyone who's read much of what I post here, I rave about Vandersteen, Kharma, Maggies, Quads, Avalon, Dynaudio, Martin Design and Evolution Audio (to name just a few). Does this mean I plan on selling my Dali Megalines and move to another speaker? .......No.

All those brands are superb designs but none of these speakers are necessarily better in EVERY area than every other one on the list. Each has major strengths and a little weakness and each represents a particular designers shot at perfection. There simply are NO perfect pieces in audio, not my Dali's, not the Aesthetix, not any brand spoken of in these forums.

However, I am not surprised when someone claims one of these as "best," or at least the best they've ever heard.

Not surprising, as they are all within the top tier.

As for Raul:
I reserve my opinion about the Essential 3150 quality sound reproduction against not only the Aesthetix one but about any other phono-line-preamp. This not belongs to my targets and I'm not the right person to do it because the Essential 3150 is an important part in the José and my life and we could have some bias in favor of the Essential 3150.

I would hope Raul would have a bias for the Essential, it's a project he is passionately involved in and the end result is a beautifully designed and built unit that I think will find great success.

There will also be people who prefer EAR, CAT, BAT, Aesthetix or ARC simply because these tube designs perform so differently than transistors. That is part and parcel of the high end business and neither confirms nor denies Raul's passion or the value of the Essential.

I look forward to another session with it, hope that happens as we discussed.
Albert- Well said. In fact, almost perfectly said. There is, of course, no perfect piece of audio writing, just as there is no perfect piece of gear. Of course, everything that I have read so far makes me regret even more, my inability to accept Doug's invitation to hear the essential. What a cool thing for Raul to have done and also very cool for the hosts, too. I'm waiting for his next trip to CT w/the 3150 Mark 2 ;~)