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
I have two close friends that run various iterations of the Io phono stage, and both use them in combination with the Callisto line stage preamp. Obviously these are made to work together and I can attest to the amazingly high quality sound that they produce. The word 'magical' comes to mind in the way that they can transport you to the musical event with good recordings.
From recent testing I have finally become convinced that the Io does benefit from a separate 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.

Absolutely, I've been saying that for years, I ran the IO + Callisto in my system for a decade and the IO benefits significantly from adding preamp.

Based on your description of sound and your preferences I would go for Aesthetix Callisto with single power supply. You should be able to find a near perfect one used here at Audiogon and although you must deal with more tubes there are countless options to tune that combo to best effect with your speakers.

I don't personally think a solid state will deliver what you are after. I've done quite a bit of listening with IO and Callisto as well as countless tube swaps (easy to find old posts here at Audiogon).

I think what attracts you to your current sound is the density and musicality of the IO so you need to play to that strength.
Ditto Albert's suggestion. Albert is one of the few people I know who've been able to critically audition both the Io by itself and the Io through a Callisto. As an alternative, I wouldn't discount using a used Atma-Sphere MP-1 as the linestage preamp for your system.

I think you risk playing major havoc to the very things you value most to introduce a SS linestage into things.