specs are here....
x220
http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310069937_32906,00.html
Specifications
* Continuous Power (20Hz-20kHz, 0.04% THD)
o 2 ch: (4 Ohm) 30Wx2
o 2 ch: (2 Ohm) 60Wx2
o 1 ch: (4 Ohm) 120Wx1
* Maximum Power (EIAJ)
o 2 ch: (4 Ohm) 75Wx2
o 1 ch: (4 Ohm) 225Wx1
* Frequency Response: 10Hz - 50kHz (0,-1dB)
* Total Harmonic Distortion:
* Signal-to-Noise Ratio: >100dB (IHF-A Weighted, at 1kHz)
* Dimensions: 10-3/8" x 2-1/2" x 9-1/2"
Features
* Bridgeable 1/2/3 Channel Capability
* PWM Regulated MOSFET Power Supply
* 2 Ohm (4 Ohm mono) Optimized MOSFET Output Section
* Balanced Isolator Input Circuit
* Oversized Gold-Plated Screw-Type Power/Ground Terminals
* Gold-Plated Screw-Type Speaker Terminals
* Gold-Plated RCA Inputs
* Gold-Plated RCA Outputs (Full Range)
* Hi-Volt Input Level Control (400mV-6.5V)
* Variable Crossover: 50-120Hz, -12dB/oct. (LPF/HPF)
* Variable Bass Boost (40-120Hz, 0 to +18dB)
* Premier Power Certification Sheet
* Premier Two-Year Warranty
x320
http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310069937_36992,00.html
Specifications
* Continuous Power (20Hz-20kHz, 0.04% THD)
o 2 ch: (4 Ohm) 50Wx2
o 2 ch: (2 Ohm) 100Wx2
o 1 ch: (4 Ohm) 200Wx1
* Maximum Power (EIAJ)
o 2 ch: (4 Ohm) 125Wx2
o 1 ch: (4 Ohm) 375Wx1
* Frequency Response: 10Hz - 50kHz (0,-1dB)
* Total Harmonic Distortion:
* Signal-to-Noise Ratio: >100dB (IHF-A Weighted, at 1kHz)
* Dimensions: 10-3/8" x 2-1/2" x 11-3/8"
Features
* Bridgeable 1/2/3 Channel Capability
* PWM Regulated MOSFET Power Supply
* 2 Ohm (4 Ohm mono) Optimized MOSFET Output Section
* Balanced Isolator Input Circuit
* Oversized Gold-Plated Screw-Type Power/Ground Terminals
* Gold-Plated Screw-Type Speaker Terminals
* Gold-Plated RCA Inputs
* Gold-Plated RCA Outputs (Full Range)
* Hi-Volt Input Level Control (400mV-6.5V)
* Variable Crossover: 50-120Hz, -12dB/oct. (LPF/HPF)
* Variable Bass Boost (40-120Hz, 0 to +18dB)
* Subsonic Filter (15Hz, -18dB/Oct.)
* Premier Power Certification Sheet
* Premier Two-Year Warranty
x720
http://www.pioneerelectronics.com/pna/v3/pg/product/details/0,,2076_310069937_34073,00.html
Specifications
* Continuous Power (20Hz-20kHz, 0.04% THD)
o 2 ch: (4 Ohm) 100Wx2
o 2 ch: (2 Ohm) 200Wx2
o 1 ch: (4 Ohm) 400Wx1
* Maximum Power (EIAJ)
o 2 ch: (4 Ohm) 250Wx2
o 1 ch: (4 Ohm) 750Wx1
* Frequency Response: 10Hz - 50kHz (0,-1dB)
* Total Harmonic Distortion:
* Signal-to-Noise Ratio: >105dB (IHF-A Weighted, at 1kHz)
* Dimensions: 10-3/8" x 2-1/2" x 13-5/8"
Features
* Bridgeable 1/2/3 Channel Capability
* PWM Regulated MOSFET Power Supply
* 2 Ohm (4 Ohm mono) Optimized MOSFET Output Section
* Balanced Isolator Input Circuit
* Oversized Gold-Plated Screw-Type Power/Ground Terminals
* Gold-Plated Screw-Type Speaker Terminals
* Gold-Plated RCA Inputs
* Gold-Plated RCA Outputs (Full Range)
* Hi-Volt Input Level Control (400mV-6.5V)
* Variable Crossover: 50-120Hz, -12dB/oct. (LPF/HPF)
* Variable Bass Boost (40-120Hz, 0 to +18dB)
* Subsonic Filter (15Hz, -18dB/Oct.)
* Premier Power Certification Sheet
* Premier Two-Year Warranty