CAT SL-1 Ultim. Mk2 vs Manley Steel. for CAT JL-2

Yes, Io signature with volume pots is good solution.
But I dont see the differece between Steelhead and Aesthetix Io sig. with volume pots which is the same package?! The both are phono stages with line stage (Manley) and another without it. If Steelhaed(line stage) lacking in gain and dynamics how can then Aesthetix Io which dont have line stage inside better Steelheads dynamics and gain?
Can you tell me the web of Aesthetix and one dealer with good prices which sell it, please.
Thank you.

Schorly, just for clarification, the Aestheitx Io inserts the volume control and single high level input in front of the last gain stage. The Io was designed by Jim White to directly drive an amp to full output. So, it has an active "line stage," but not on par with the dedicated full-function line stage of the Callisto. I don't know how the Steelhead is constructed in this regard, but I would suspect it's similar.
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Jafox,
Would you tell us which version of the JL-3s you have and how you chose between them? There is "JL-3hc" (300 wpc/$10K retail) and JL-3 Signature (200wpc,$30K retail). I'm wondering if you are familiar with the performance differences between the two units, and what could justify the much higher price of the Signature version.

As I'm sure you know, there is no CAT website to refer to for product information.

What cartridge are you using? I would recommend a Placette Active Preamp & the ASR Basis phono stage. The Placette Active will outdo anything until you go above 10K. As for phono stage the ASR is on special here (demo) and is able to accomodate multiple cartridges. Otherwise there is a following on Supratek here. I haven't heard it but it seems to be a great compromise. Whatever you do I am sure the sound will be great. I have the 7s w. VTL & a custom phono stage due any day now. (6 months to make, but lets see how it sounds). I was using a Groove w. my Placette before. The Groove is excellent in most areas but just misses in a few areas & can't easily be tailored to different cartridges. Hence I sold it.

Ubglub, Jafox has the JL3 Signatures ($30k/pr) which are rated at 150 watts each. The JL3 (standard) monoblocks, also rated at 150 watts each, are $22k/pr, and the JL3HCs are basically the same thing, set up for high current capability. The JL3 Signatures are the all out version, including larger, more refined output transformers than the standard JL3s. You are correct, there is no CAT website presently.
Brian