You maybe right. Here is the specs of NAD C356BEE:
POWER AMPLIFER SECTION
MAIN IN, SPEAKER OUT
Continuous output power into 8 ohms and 4 ohms (Stereo) >80 W (at rated THD, 20 Hz-20 kHz, both channels driven)
Rated THD1 20 Hz – 20 kHz, CCIF IMD, SMPTE IMD, DIM 100<0.007 %
Clipping power >90 W (at 1 kHz 0.1 % THD)
IHF dynamic headroom - 8 ohms +2.6 dB
4 ohms +4.4 dB
IHF dynamic power - 8 ohms 145 W
4 ohms 220 W
2 ohms 290 W
Peak output current >50 A (in 1 ohm, 1 ms)
Signal-to-noise ratio >101 dB (A-weighted, ref. 1 W)>
120 dB (A-weighted, ref. 80 W)
Damping factor >100 (at 8 ohms, 50 Hz and 1 kHz)
Frequency response ±0.3 dB (ref. 20 Hz - 20 kHz)3 Hz – 70 kHz (ref. -3 dB)
Input impedance 20 kohms + 1 nF
Input sensitivity 950 mV (for 80 W in 8 ohms)
Voltage gain 29 dB
Headphone output impedance 68 ohms
Channel separation - 1 kHz >80 dB
10 kHz >70 dB

It doesn't have sub pre-out, so can't crossover and have to drive full range. It has A+B speaker, now A to M22s, B to EP500. If I set crossover on EP500 on a higher frequency, would it help? Any other suggestions?

Last edited by Rock; 03/20/17 06:19 PM.