Linearman,
First I'd like start by saying I could afford any unit in the tact range, or nearly almost any equipment, I like yourself choose purely on sound alone. (Thats not meant to sound funny or flash harry at all)
I get to hear many different pieces of equipment weekly, some new prototypes, the latest spec US gear, so low level quality valve gear.
So what I'm trying to say in a round about way is, It doesn't do it for me.
It obviously does it for you guys.
WE all look for different things in our sounds.
My mod tally with Tacts is 7 (Two 2.0 pre amps correction units, Three 2.2 pre-amp room correction with bass units) and 3 of the power amps the £800 touch units.
Lets start with the Pre-amps, basically a medium grade PC control system, with SIMM for adc/dac/room correction software.
Placed in a nice box with an off the shelf cheapo SMPS which sprays the interior of the unit with rfi/emi.Contaminating the whole shabang, its been detailed enough on plenty of forums.
Lots of gains here, I personally remove the psu from the main box and construct a bespoke custom torroidial unit with totally isolated super regulated independent dc feeds. Suppiled by a unique Umbilical fully screened supply locking lead.
Full, screened techniques employed inside along with reclocking circuit & seperate psu, custom leads for the ribbon cables too. *Plus other items*
The Power amp, isn't quite so bad (the forwardness I describe comes from these, I have not heard the Intergrated version)
Mains conditioning helps a lot with this along with more naturalness & flow, doesn't cure it all though.
Switchers by the nature are almost self defeating,a lot of designs NEVER get through CE approval due to the interference generated by the switching module & FETS
I'm not going into great detail here, this is my ~little area of joy~ so to speak.
I take the Sdai is the same power amp coupled with a pre amp section in a different box.
Andy, if you wish to take a few internal shots for me I would be greatful, however only first by benchmarking through a series of tests will I be able to determine the Exact areas that need attention as effectively I need to reverse engineer it.
If the power amp section is the same, then some most useful gains can be made.
Just for the record, my personal interest in Switching technology goes back only 3 years so not a lot compared to Linear man I feel
However a couple of us like minded engineers have developed our own switching chipset, a few of the guys have heard its potential.
The lost point though (Sorry) is simple if Tact or ANYONE produced a no budget designed unit, based on what sounded good and the not spec sheet, it would be un reachable to all but the most well heeled, we all realise that.
I just offer a chance to get a lot closer, without the constraints placed upon the designs by budgets and timetables thats all.
Wm