Introduced in 1968, CONTROLLED SOUND heads are single-ply Ambassador-weight heads with a 5 mil thick black or clear dot in the center of the head. This combination offers a controlled, centered sound without undesirable overtones.
These dual-zone heads have a combination of medium and heavy-duty drumhead characteristics. The outer area of the head's playing surface offers a midrange tone and sensitivity while the laminated center dot eliminates high frequency overtones and adds durability and tonal focus to meet the demands of heavier hitters.
Basic Guide to heads
There are 2 kinds of head on each drum. The side that you hit is the batter head while the bottom skin is a resonant head.They come in single- or two-ply (1 or 2 layers of material) construction in a variety of materials and finishes.
You get an increased resonance and sustain with one-ply heads, while heavy hitting music can sound better on the heavier double-ply heads.
The drum head's thickness is another thing to consider. Thinner, single layer heads have a sensitive response, with bright, resonant sound and complex overtones.
Thicker single-ply heads are more durable and have a higher tuning range with less sustain and more attack than thinner heads.
Two-ply heads have less attack and a quicker decay for a focused tone. They can take a serious pounding so if you're slamming away with a double pedal this might be your best choice.
Some batter heads have a dot affixed to the top or bottom of the head to muffle excess ring. This gives you a more focused, drier sound. Some players still put a line of duct tape on to achieve this same effect but the results are unpredictable and it really spoils the look of the kit.
Note: If you use brushes you're going to want to stick with heads using dots on the head's underside to avoid snagging a bristle.
Drum heads with a white or black coating give a subtle muffling effect. Some have internal sound rings embedded around their outer perimeter to control excess ring.
Many jazz drummers put clear heads on the toms and a classic white-coated head on the snare drum, as the texture of a coated snare head sounds better with brushes. The bottom head on the snare drum is known as the snare-side head, a transparent, extra-thin head that maximizes response to the snare wires.
Bass Drum heads
Bass drum heads can include an internal dampening system on the batter head to provide a controlled sound and a port hole for improved tone and to make it easy to fit a mic. Port hole protector rings are also available to prevent your drum head from ripping or denting when fitting a mic.