Remo BR111800 Coated Ambassador 18" Bass Drum Batter Head Speaker Stands the coverage pattern is unusually

the coverage pattern is unusually uniform over its range of operation

enabling the enclosures to be used in settings where background noise must be kept to a minimum

Its not "just" the tubes

as well as a High Frequency (HF) mode switch

Remo BR111800 Coated Ambassador 18" Bass Drum Batter Head Speaker Stands the coverage pattern is unusuallyThe Ambassador Coated is the most popular drumhead in the world, featuring the perfect combination of warm, open tones with bright attack and controlled sustain. Constructed with 1 ply 10 mil Coated film, Ambassador Coated drumheads are the industry standard for all applications. Provides bright attack and controlled sustain 1 ply 10 mil Coated Film Ideal for Tom, Bass and Snare batter applications The worlds most popular 1 ply Coated drumhead