Evans UNO EQ4 Series: Balanced Tone with Internal Control

The EQ4 series is designed to deliver a balanced bass drum sound with a blend of attack, full low-end sustain, and controlled overtones. The UNO version offers these characteristics in a more accessible package.

22-inch Diameter for Bass Drum Batter

The "22" signifies a 22-inch diameter drumhead, which is the most common size for a bass drum batter head (the head you strike). "BD" (or UBD for UNO Bass Drum) indicates it's a Bass Drum head.

Single-Ply Construction with Fixed Internal Overtone Control

The UBD22EQ4 features a single-ply construction for resonance, but with an important addition for control:

• Single Ply of 10 mil Film: The head is made from a single ply of 10 mil (0.25 mm) Mylar film. This provides:

  • Good Responsiveness: Allows for sensitive and articulate playing.

  • Balanced Sustain: Offers good resonance for a full tone.

• Fixed Internal Overtone Control Ring: A key feature of the EQ4 series (and hence the UNO EQ4) is a fixed internal inlay ring (also called an "overtone control ring"). This ring is permanently attached to the underside of the head around its perimeter. Its purpose is to:

  • Focus Tonal Response: It helps to slightly dampen unwanted ringing overtones without choking the head's natural resonance too much.

  • Balance Attack and Sustain: It allows for a good balance between a clear initial attack and a full, but not overly boomy, low-end sustain. The width of this ring is proportional to the head size to optimize control across different diameters.

Clear Finish for Brightness and Projection

The "CLR" (implied by the lack of "F" for frosted or "C" for coated in the model number, and explicitly stated in product descriptions) indicates a clear finish.

• Clear Finish: A clear drumhead generally offers a brighter, more open, and more projecting sound. It allows for a more pronounced initial attack and emphasizes the fundamental pitch of the bass drum with crisp definition.

Crimped Collar Design (UNO Series Specific)

Unlike the premium Evans heads that feature Level 360 Technology, the UNO series often uses a crimped collar design.

• Cost-Effective Construction: This construction method helps to reduce manufacturing costs, making the UNO series more affordable.

• Solid Fit: While not as advanced as Level 360, it still provides a solid and functional fit to the drum's bearing edge.

Sound Characteristics

The Evans UBD22EQ4 offers a sound profile characterized by:

• Optimized Punch: Delivers a clear, focused attack.

• Full Low-End: Allows the bass drum's inherent low frequencies to come through.

• Controlled Overtones: The internal control ring manages excessive ringing, keeping the sound clean.

• Balanced Sustain: Good resonance without being overly long or uncontrolled.

• Versatile: Can be tuned to achieve a range of sounds, from open and boomy to more controlled and punchy, depending on tuning and external dampening.

Intended Use

The UBD22EQ4 is primarily a bass drum batter head (the head that is struck by the pedal beater). It is suitable for:

• General Purpose: A good all-around bass drum head for various musical styles.

• Pop, Rock (lighter styles), Jazz, R&B, Funk: Where a balanced, responsive, and somewhat controlled bass drum sound is desired.

• Budget-Conscious Drummers: Offers good quality and performance at a more affordable price point.

• Drummers who prefer internal dampening: The fixed internal ring provides built-in control, reducing the need for extensive external muffling.

• Studio and Live: Can be effective in both settings, particularly when mic'd.