| The A1 mainframe is designed for use with d&b’s active systems and is housed in a 3 rack unit high, 19" rack mount enclosure. The mainframe incorporates power supplies for the controllers and mainframe electronics, two power amplifiers, softstart, monitoring and protection circuits with the associated indicators and all connectors. All functions can be remotely interrogated and altered via the d&b Remote Interface Bridge (RIB). The mainframe accepts a single exchangeable controller module which determines both the type and number of loudspeakers which can be driven.
The A1 power amplifier consists of two separate channels of differing output power. The high power channel handles the low frequencies or subwoofers and the lower power channel the high frequencies. The amplifier is comprehensively protected against overheating and connection to inappropriate or faulty loads, has a high peak output current capability and a low feedback internal gain structure. Speaker ID protects wrongly connected speakers from possible damage. d&b SenseDrive electronics maintains maximum damping factor with complex loads, and improves low frequency transient performance when using long speaker cables.
Specifications
Mains power indicator: PWR (green)
Overtemperature indicator: TEMP (red)
Protect indicator low channel: PROT LO (red)
Protect indicator high channel: PROT HI (red)
Remote control status indicator: REM (green)
Lock (excl. mains power switch): LOCK (yellow)
On/remote control/off switch: ON/REM/OFF
Signal input and speaker connectors: see controller module section
REMOTE connector: DIN 41524, 3 pin
Protection circuits: mains inrush current limiter
self resetting mains overvoltage protection
self resetting overtemperature protection
temperature and signal dependent DC fan
output short and open circuit protection
output DC protection
speaker switch on delay
Data (less controller module)
Rated output power (THD+N < 0.1%)
low channel . 1200 W / 700 W into 4 ohms / 8 ohms
high channel . 350 W / 200 W into 4 ohms / 8 ohms
Frequency response (–1 dB)* 10–50k Hz / 35–65k Hz
THD+N (20–20k Hz)<0.05% / <0.03%
IM (SMPTE)<0.06% / <0.02%
Slew rate 35 V/µsec. / 30 V/µsec.
Damping factor (20–1k Hz)> 120 / >120
Crosstalk (20 - 20k Hz)< –55 dBr / < –55 dBr
S/N ratio (unweighted RMS)>111 dBr / >112 dBr
Dimensions (H x W x D) 3 RU x 19" x 353 mm /13.9"
Weight 22 kg / 48.5 lb (with module)
Mains voltage rating 220 – 240 V / 50 – 60 Hz
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