KEEPING IT COOL

DIGITAL DESIGNS’ FREE FLOW COOLING SYSTEM

(Patent Pending)
The cooler you keep the voice coil, the more efficient the speaker is. Heat is the Achilles heel of a speaker and causes burned coils, melted glues, blistered coil formers and multitudes of other deaths, by fiery ends. The Free Flow Cooling System was designed to increase the air flow into and out of the speaker motor. The motion of the speaker is harnessed to pump cooling air throughout the motor and voice coil in order to lower the working temperatures.

AN AIR PUMP IN EVERY SPEAKER

The action of the dust cap forces air into and out of the pole piece with every motion. But the traditional pole vent does little to cool the heat build up in the coil. This build up occurs much quicker than the slight cooling effect the air through the pole piece can wick away. The key is to cool the coil, not the pole.

MACHINED AIR VENTS

The Free Flow Cooling System uses a restricted pole vent which creates some back pressure in the top section of the pole. Cross drilled holes run from the center of the vent and exit out the sides of the pole piece. These cross drilled holes direct the back pressure in the vent directly to the inside of the voice coil former. These cross drilled vents are then staggered down the length of the pole piece to keep the cooling air following the coil throughout its range of motion. The voice coil is cooled from the top of the stroke, to the bottom of the stroke.

MORE VENTS

The voice coil former itself is heat conductive and provided with additional cooling vents.

STILL MORE VENTS

The action of the spider resembles the action of a billows under excursion. The Free Flow Cooling System uses this air action by directing the flow into angled channels machined into the top plate voice coil gap. The action of the spider blows cooling air directly to the voice coil windings on every stroke.

AND EVEN MORE

Some models offer additional heat exhaustion out through machined vents that run through the top plate itself. These vents connect the inside of the voice coil gap to the outside of the motor, removing heat and drawing cool air into the motor.

A LOT OF MACHINING

The 95/9900 models have 26 machined vents in the motor to direct cooling air to the voice coil. DD's Free Flow Cooling System effectively turns every speaker into an air pump, the harder the speaker is driven, the more air is pumped to the coil. Pretty cool, huh.

All internal motor parts are also blackened to double the thermal transfer from the coil to the motor parts. These motor parts are also cooled by the machined vents and the pumping air. The Free Flow Cooling System makes for a very thermally stable speaker, ready to go cruising.