Accuphase Class A or A/B speaker match Dynaudio C1

I have a 70 watt@4ohms tube integrated (Octave V70SE) running class A/B driving my C1's. The power is fine. I replaced my Bryston B100 rated at 180 watt@4ohms. The Octave just crushes the Bryston in power - control and dynamics. Even though the C1's do sound their best at higher listening levels the Octave brought me much more pleasure listening at low to mid levels which is my normal listening levels. What I'm trying to say is you really to listen for yourself and don't get too caught up in watts. I know that doesn't answer your question regarding class A vs class A/B.

C1 Technical Specifications:

Sensitivity 85 dB (2,83 V/1 m)
IEC Power Handling 170 W
Impedance 4 Ohms
Frequency Response 45 Hz – 22 kHz (± 3 dB)
Box Principle 2-way bass-reflex
Crossover Frequency 1800 Hz
Weight 10.9 kg
Dimensions (W x H x D)
200 x 445 x 430 mm
7.9 x 17.5 x 16.9"

E-550 technical specifications

●Continuous Average Output Power (both channels driven, 20 ~ 20,000 Hz)
150 watts per channel into 1 ohm (✽)
120 watts per channel into 2 ohms
60 watts per channel into 4 ohms
40 watts per channel into 6 ohms
30 watts per channel into 8 ohms
Note: Ratings marked ✽ are for music signals only.
●Total Harmonic Distortion (both channels driven, 20~20,000 Hz)
0.05% with 2-ohm load
0.02% with 4 to 16-ohm load
●Intermodulation Distortion 0.01%
●Frequency Response HIGH LEVEL INPUT/POWER INPUT
For rated continuous average output: 20 ~ 20,000 Hz +0, –0.2 dB
For 1 watt output: 2 ~ 150,000 Hz +0, –3.0 dB
●Damping Factor 140 (with 8-ohm load, 50 Hz)
●Input Sensitivity, Input Impedance
●Output Voltage, Output Impedance PRE OUTPUT: 0.617 V, 50 ohms
(at rated continuous average output)
●Gain HIGH LEVEL INPUT ➞ PRE OUTPUT: 18 dB
POWER INPUT ➞ OUTPUT: 28 dB
●Tone Controls Turnover frequency and adjustment range
BASS: 300 Hz ±10 dB (50 Hz)
TREBLE: 3 kHz ±10 dB (20 kHz)
●Loudness Compensation +6 dB (100 Hz)
●Attenuator –20 dB
●Signal-to-Noise Ratio
●Power Level Meters Logarithmic compression, peak reading meters
Output dB/% scale
●Load Impedance 2 ~ 16 ohms
●Stereo Headphones Suitable impedance: 8 ~ 100 ohms
●Power Requirements AC 120 V/230 V (Voltage as indicated on rear panel) 50/60 Hz
●Power Consumption 200 watts idle, 300 watts in accordance with IEC-60065
●Maximum Dimensions Width 465 mm (18-5/16”)
Height 196 mm (7-11/16”)
Depth 427 mm (16-13/16”)
●Mass 23.9 kg (52.7 lbs) net
30.0 kg (66.1 lbs) in shipping carton
●Supplied Remote Commander RC-200
Remote control principle: Infrared pulse
Power supply: 3 V DC (IEC R03 batteries x 2)
Maximum dimensions: 56 mm × 75 mm × 26 mm
Mass: 153 g (including batteries)

First of all, the Dynaudio C1 in the glossy rosewood finish is drop-dead gorgeous. If this speaker would perform well at lower listening levels as it does at higher levels, I would have bought a pair long before now.

My Accuphase E-550 can easily drive the large Amphion Xenons to levels that shake the brick walls in my home.

I had C1s on 200 watt McIntosh and the power guards went off. ymmv, but i think they need power.

I agree with everything said above especially the lower volume issues with these speakers. In a large room I just don't think a smallish amp is gonna cut it. Their impedance when measured was closer to 83 db. It's not a volume issue, anything will play them loud. .... It's a dynamic and subtlety issue that lower current amps cannot provide.