Product Review (December 2008)
Active Thermal Management - Cool-Line II Cooler

By Kevin Nakano

Active Thermal Management (ATM) has announced their new Cool-Line™ linear ventilation products, designed to provide quiet cooling in tight places. The new product is available in metal and various species of unfinished wood. There are also matching grilles, without fans, available in metal and wood to further trim the intake openings. Cool-Line products measure 4” or less in depth with varying lengths from the 15” (single fan) Cool-Line I to the 30” (twin fan) Cool-Line II. Various other sizes are available by special order. The Cool-Line II unit measures about 30.25" wide x 3.25" high. The cutout opening needs to accommodate 29" x 2.5" and allow for 4" deep. Each fan moves approximately 20 CFM in free air providing excellent ventilation in cabinets with heat-producing electronics. The fans are powerful, yet run quietly thanks to the advanced temperature control loop.

Thermal Control
The Cool-Line II includes a separate thermal control unit that limits the voltage to the fans based on the temperature sensed by the two remote thermal probes. The circuit increases the voltage drive to the motors as the temperature increases. This prevents overheating in the enclosure. The temperature control unit is designed to support up to four sets of fans, which can be connected directly to the terminal board. The transformer-based power adapter is rated with an output of 9VDC at 0.5 amps and connects to the thermal control module though a power jack. This makes it easy to disconnect the power adapter from the rest of the unit during installation.

The Cool-Line II has two squirrel cage fans, each measuring 11.5" long and 1.25" in diameter. The fans are designed to move a lot of air. Since the Cool-Line II uses a thermal control unit with temperature sensor, there is no need to switch power to the cooling system. It can stay plugged in continuously and only runs when needed.

The Active Thermal Management Cool-Line series not only looks good, but also does a great job of keeping electronics from overheating in an enclosure. The company offers many options including various finishes to suit your needs. We found the engineering and build quality to be excellent. Retail pricing for Cool-Line products ranges from $330 to $595, depending on size and grille material. If your components need cooling, you should be looking at the many options available from Active Thermal Management.

- Kevin Nakano

OPPO BDP-103 Blu-ray Player

Review at a glance

Active Thermal Management - Cool-Line II Cooler


  • Very quiet
  • Simple installation
  • Low power consumption
  • Rated for continuous operation

Company Information
Active Thermal Management
25570 Rye Canyon Road
Valencia, CA. 91355
Phone: 661-294-7999
Fax: 661-294-1115

Source: Manufacture Supplied
Part number: 01-002-02
MSRP: Cool-Line II ($330 to $595)


Any comments or questions regarding the LAAF Web Site should be forwarded to

Copyright © 1985-2008 L.A. Audio File