2. amps-preamps
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Preamp for Aesthetix / Atma-sphere

Hi

I have the Aesthetix Io Eclipse with volume and dual power supplies, Atma-sphere MA-1 monoblocs (140 watts) and Audiokinesis Dream Maker (93 db sensitive) speakers. These are great components. My question is about system synergy, how to make them play together.

I have been running the Io direct to my amps since I first bought the Mk2 version back in 2004. At the time, I had a Krell FPB600, and in that context, it was a blessing, and a great step up from the Krell KAV 250p preamp. I'll never forget my first impression with the Io - it was like going from the wooded hills up into the mountains. There was no going back.

With volume, the Io functions as a preamp. It looks like a preamp. Someone here on A-gon said going direct is best - which I interpreted as: it IS a preamp! So I thought, OK I have a combined phono and preamp - problem fixed. But it wasn't.

From recent testing I have finally become convinced that the Io does benefit from a separarate preamp. Even if clarity and detail is better going direct from the Io to the amps, the punch and "here-ness" of the music is clearly better with a preamp in the chain, at least in my system.

Trouble is, which preamp? I am testing a small solid state Musical Innovation preamp, which helps with the punch but veils the music. An optimal solution might be the Aesthetix Callisto, preferably with dual power - but I don't have the space, and I already have a lot of tubes and tube heat. I have space for one or possibly two boxes.

From what I have heard so far, a solid state might do the job well (in my tube-rich context), however it should not impart any s-state artifacts or reduce the resolution from the Io Eclipse.

The ideal would be to test a few tube and s-state preamps, and then decide. However, this is difficult where I live, so advice is welcome.

My question relates to my own setup of course, but is relevant for everyone with a top phono stage on the one hand and amps on the other. What is best in the middle?

From recent testing I have learned that problems that I thought were related to the speakers, the phono pre, the pickup and so on, were in fact related to the preamp issue. For example, the Dream Makers straight from the Io may sound a bit lazy and washed out in the bass, very clear in mid and treble but not fully embodied. Plugging in the solid state pre, the situation becomes dramatically different, now the speakers are driving, propulsive. Very enjoyable, but some detail is lost and some transistor things added that I don't want.

So I am looking for a solution with most of the plusses, and not much of the minuses. The preamp must be fully balanced with XLR in / out.
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Ag insider logo xs@2xo_holter
albertporter's avatar
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albertporter
4,949 posts
 

The coolest thing about the Einstein was that you can optimize the tube for each line input
Jafox (System | Reviews | Threads | Answers | This Thread)

I forgot about that, an attribute definitely worth mentioning.

As for the Einstein vs. the Callisto Sig., these both portrayed space with aplomb which says a lot as so few line stages truly get this right. ....Jafox (System | Reviews | Threads | Answers | This Thread)
Agree, and in our test the Callisto threw a larger but less specific sound stage with more bloom.

The Einstein sounded "faster" overall and the extreme highs had more sparkle and drive than the Callisto. Some in the group preferred this and some not.

The Callisto and likely the Atma-Sphere can be tuned for more sparkle with tube choice. For Aesthetix, Siemens is an option that delivers predictable results. It's not my favorite tube for that circuit but many people love that combo.
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o_holter OP
977 posts
 
Very interesting!

Albert - I use very low noise Telefunken in the Io, as you've written many times, these tubes are critical, and they help in the second and third gain stages also. The pair of Siemens is for the Einstein phono input, based on advice from Brent Jessee. I am enjoying the Hytron 12au7. Thanks also to Jafox, I've ordered a RCA 12BH7.

Space with aplomb - yes, and momentum, drive. Very engaging. I am playing the Vermont LP, and especially the 45 rpm bonus single. The sound is glorious, a bell strikes forcefully, the sound hangs on in the room. It may be a coincidence but I've found out that this German preamp likes kraut. Especially, ambient kraut.
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o_holter OP
977 posts
 
Charles1dad - thanks, you make an interesting point, perhaps my preconceptions are wrong. But to my ears, the Io has the highest resolution. With the Einstein, I may not hear all the small sounds in Zappa's orchestra playing Waka Jawaka, but I get an immense sense of drive and purpose. This is information too. So it may be, you are right, with a superior component you stop thinking of details and resolution. It is "hidden" so to speak.

You also say: "the direct route appears to be omitting significant vital details of your recording. The Einstein is presenting the more complete music signal."

Well - not sure if the Einstein is more resolved or complete, they are both high quality. The main case here, rather, is that the Io needs a preamp to do its best. I don't think it is omitting anything, it is just not optimal as a preamp, even if it has volume.

It is like the Io is offering the "dots" but I need a preamp to draw the "lines" between them. There are always some dots lost (and some false lines) with the preamps I've tried so far, although less so with the Einstein. It is a give and take, as others here have commented.
charles1dad's avatar
charles1dad
10,250 posts
 
Hi O holter,
What i took from your comparision was the Einstein was providing sonic information that the IO alone did not. Those specific qualities you attribiute to the Einstein's insertion were benetficial(necessary?) to draw more emotion and communication. You weren't getting this(or at least not as much) with the IO running solo to your amplifier.

Based on your description The Einstein is doing " something" very right and desireable. It seems to mimic more closely what one would experience in a live setting. If the IO is more resolved and detailed then why does it not retrieve/convey the vital qualities(information) as the Einstein does? Maybe I'm misinterpreting what you wrote, it seems the Einstein is giving you more music.Do you make a distinction between "detail" and musical information?
thanks,
Charles,
jafox
1,459 posts
 
The Io's strengths are not at all detail or resolution that often is heard in the upper octaves. If you want a phono stage that is simply a leader in the class of portraying space and magic in the upper bass to upper mids, this is itÂ…..in spades! It can be so addicting. But hearing modern designs with far fewer gain stages and passive components, you then quickly learn what the Io gives up in clarity, better delineation between notes (especially piano as they are not so exaggerated) and more appreciation to the upper octave instruments, and percussion.
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