Accuphase Class A or A/B speaker match Dynaudio C1

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.

The Accuphase E450 which has 180w sounds less powerful than the E560 with 30watts Class A.
In a small to medium room, the Class A Accuphase should be able to drive those C1s.
I heard the E550s drive those ATC SCM19s which are more power hungry than the C1s. Drove them to high levels but at extremely hi levels, the E550s could use some more power. But we are talking about real loud loud stuff.
Good luck.