QSC

Professional quality performance - incorporates road-proven QSC designs
High-current toroidal transformers for greater two-ohm power and low noise
Independent user-defeatable clip limiters reduce distortion
Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
Balanced 1/4'' (6.3mm) TRS, XLR, and barrier strip inputs
Binding post and Neutrik SpeakonTM outputs
Signal and clip LED indicators to monitor performance  4 Ohm: 2 x 300 W

The RMX 1850HD provides improved thermal performance that provides higher continuous power into 2-ohms stereo or 4-ohms bridged applications.    4 Ohm: 2 x 600 W

4 Ohm: 2 x 750 W
Input Filter:
Boosts the system´s response by matching the amplifier´s range to your speakers. Prevents speaker bottoming and low-frequency muddiness. Each channel is separately adjustable: 50Hz for most compact full-range speakers; 30Hz for subwoofers and large fullrange systems; and OFF for studio monitoring.

2 x 1600W 4 ohms
Features
Dual mono, high current power supply for increased reliability and performance
3U chassis and only 16" deep
High-current toroidal transformers for greater two-ohm power and low noise
Independent user defeatable clip limiters reduce distortion AND help to protect speakers
Selectable low-frequency filters (30 Hz or 50 Hz) protect speakers and increase headroom
Balanced 1/4" (6.3 mm) TRS, XLR and barrier strip inputs

800 watts x 2 into 8 ohms.
600 watts x 2 into 4 ohms
Perfect for front of house systems, DJ applications and monitor use.

1500 watts x 2 into 2 ohms
900 watts x 2 into 4 ohms
Ideal for large front of house systems or sub-woofers