¿Puedo unir ONKYO 605 con unos ps204 y subwoofer psw2

Pues quiero adquirir un onkyo 605 que pone en las especificaciones:

Datos web USA:

Amplifier
#
Channels 7

Power (8ohms 20-20kHz 0.08%) /Ch 90W

Power (8ohms 20-20kHz 0.05%) /Ch -

THX Certified -

Continuous 6ohms Rated

Certified 4ohms performance -

High Instantaneous Current Capability 36A

Amplifier Frequency Response 5Hz-100kHz

S/N Ratio (LINE IN) 106dB

All Discrete Circuitry

Dual PUSH-PULL Design -

Toroidal Transformer -

Independent Power Supply -

Optimum Gain Volume

Non-Scaling Configuration

Bi-amp Capability For Front

BTL Capability For Front -

Datos web Europa:

Audio Features
• 140 W/Ch Minimum into 6 Ω, 1 kHz, IEC (1 Channel Driven)
• DTS®-ES™ Discrete/Matrix, DTS® Neo:6, DTS® 96/24, Dolby® Digital EX™, Dolby® Pro Logic IIx
• H.C.P.S. (High Current Power Supply) Massive High Power Transformer
• 192 kHz/24-Bit DACs for All Channels
• WRAT (Wide Range Amplifier Technology)
• Advanced 32-Bit Processing DSP Chip
• 5 Digital Inputs (3 Optical/2 Coaxial)
• Subwoofer Pre Out
• CinemaFILTER™
• A-Form Listening Mode Memory
• Optimum Gain Volume Circuitry
• Non-Scaling Configuration
• Tone Control (Bass/Treble) for Front L/R Channels
• Color-Coded 7.1-Multichannel Inputs
• Independent Crossover Adjustment for F/C/S/SB (40/50/60/80/100/120/150/200 Hz)
• Double Bass Function

y añadirle unos PURE SOUND PS204 + SUBWOOFER PSW2 de 4 Ω.

¿¿¿Es posible o tendré que optar por otro A/V????

en las especificaciones americanas pone 4 Ω certificated...

¿Alguna idea?