Here is another great deal:  The Infinity Reference Series Model # REF1600A, 600 Watt MonoBlock Car Audio Subwoofer Amplifier.  This is an excellent amplifier that works particularly well in sealed box woofer and SQ applications.  These are factory refurbished units and come with all accessories and an Infinity factory warranty.

Per Infinity:

The REF1600A-Z features a 12dB-per-octave electronic crossover, allowing you to optimize bass performance based on enclosure type and subwoofer selection.

Full-range preamp outputs facilitate use of multiple-amplifiers without the need for noisy and expensive adapters or signal splitters.

Key Features

• 600 Watts
• On-board electronic crossover
• Variable bass boost circuit
• Remote level bass control
• Port for future expansion products 

Specifications*:

• Power Output : 400 watts rms x 1 channel @ 4 ohms (mono) and ≤1% THD + N.
                           600 watts rms x 1 channel @ 2 ohms (mono) and ≤1% THD + N .
                           Dynamic power 894 watts x 1 channel @ 2 ohms (mono).
                           Power ratings per CEA-2006 standard.
• Effective Damping Factor: 6.3 at 4 ohms
• Frequency Response: 11Hz to 330Hz (-3dB)
• Maximum Input Signal: 6V
• Maximum Sensitivity 100mV
• Output regulation 0.12 dB at 4 ohms
• Dimensions (L x W x H): 14-3/16″ x 9″ x 2-11/16″(361mm x 229mm x 69mm)
• Fuse rating: 3 x 25A
• Included: 4 mounting screws, 3 spare 25A fuses, 1 remote level control, 1 remote level control
   cable (RJ11), owner’s manual, warranty card

REF1600A-Z Product Condition: This is a factory-remanufactured unit carrying the original factory warranty.

What is factory remanufactured?  This term is used to describe an item that has been repaired or restored back to factory specification and proper operating condition, by us, the manufacturer. We back the quality of these products 100%. They come with the same accessories and warranty as if they were brand new, unless otherwise stated, but may have minor scratches or other imperfections in their appearance. 

*We found somewhat different specifications on different Infinity webpages, so, we are listing the specs by what is stated in the manual, available at: http://manuals.harman.com/INF/CAR/Owner%27s%20Manual/REFampOM2007(web)rev2-5-07.pdf

Infinity Reference Car Audio Amps Product Info.
http://manuals.harman.com/INF/CAR/Product%20Information/reference.amps.pis.vF.pdf
Infinity REF1600A webpage (2009)
http://www.infinitysystems.com/car/products/product_detail.aspx?prod=REF1600A&cat=AMP&ser=REF&Language=ENG&Country=US&Region=USA

Infinity Ref1600A Owner’s manual (2009)
http://manuals.harman.com/INF/CAR/Owner%27s%20Manual/REFampOM2007(web)rev2-5-07.pdf

http://www.infinitysystems.com/car/products/images/products_large/REF1600A.jpg

Price: 

$149.00 each.

For additional Ordering Information please click here.