Tube amp for "difficult" speakers,,,

Increasing power to 200 watts into 4 ohms versus 160 watts into 8 ohms still causes a volume imbalance in the 4 ohm frequencies (they'll have less volume than the higher impedance frequencies). The speakers will sound tipped up with lack of body, IMO.

You need 320 watts into 4 ohms for 8 ohm speakers to produce a balanced sound from top to bottom.

The impedance curve is key. If it's relatively flat, you're in good shape to use a tube amp.

Ultimately your right, difficult impedance loads (not necessarily but jagged, irregualar dips and spikes) really do need SS.

Just a thought you might contact Kevin Hayes at VAC and get his thoughts. I have a Ren 70/70 and it has plenty of power for Dynaudio drivers although the crossovers are custom. I know the speakers efficency is in the high 90's. Kevin's amps have tremendous transformers and really deliver more then there stated output in my experience.

Roger

The OP's speakers have an 83dB sensitivity.

The amp's power, or the size of it's transformer is not really the issue. It's the impedance curve of the speakers that matters.

I owned 160wpc VAC amps, which I tried on my Silverline speakers which employ Dynaudio drivers. The Silverlines do not have a flat impedance curve, and the result was an aggressive, tipped-up sound without midrange weight or sufficient low end to balance the highs.

I know an older gentleman who used to own Consequence. He has gone thru many amps, from high power solid state like Bryston 7B-ST to a 70wpc tube amp. His favorite was the medium power tube amp that was made in Canada, but the company has gone belly up and I can't remember the name at this moment.

I used to own Confidence 5 which many believed are the modern iteration of Consequence. I have tried 10+ amps on those and I would not recommend tube with them. The best tube amp I had success with was Sonic Frontiers Power 3, but even then they could not fully bring out the bass.

If you are not dead set on Consequence, I suggest you look for a new speaker that has more resolving power, quicker, more transparent, and easier to drive. As much as I loved the Confidence 5, I have moved on and much happier now.