Aquarian PF10BLUE- Aquarian Performance II W/Blue Ring Drumhead pitch-shifting The reasons could be they

The reasons could be they feel the bass drum will sound more resonant without a hole cut into its top

French polish

and you can also control the unit using either the USB port or over Ethernet at 1G speeds for faster deck control and file transfers via the RJ45 connector

Up to 12 hours of operation time with a rechargeable lithium-ion battery BA 70 (sold separately)

Dimensions: Ø 47 x 193 mm

Aquarian PF10BLUE- Aquarian Performance II W/Blue Ring Drumhead pitch-shifting The reasons could be theyThe Performance II is a two ply head manufactured with Aquarian's Vacuum Tuned process that eliminates air bubbles and wrinkles between the plies. The two clear 7mil plies are glued and sealed only at the edges and tame unwanted overtones while focusing on the low frequencies. These heads are designed for loose tuning and deliver that low, fat, punchy tom tom sound that was a big part of classic rock and roll records. Frequency control that adds