Ultimate A4 - The Big Four, 4 x 85 Watt

	Bridge mode connections and more
	Manual for Ultimate A2 - A7

Product Reviews

	Test review of A4 in Talk Audio (UK)
	A4 test in German AutoHiFi 4-2003

ULTIMATE series A4 is a powerful 4-channel amplifier. The amplifier is 1 ohm stable and provides a power output of 4 x 85 Watts with 4-ohm stereo and 2 x 250/400 Watts with 4/2-ohm mono bridge-connection.

- Built-in variable 50-125 Hz low-pass filter for subwoofers on all channels.
- Additionally, a built-in variable 20-200 Hz high-pass filter that can be used as a subsonic filter or high-pass filter for front systems.
- The frequency on the filter can be switched so that two of the channels can be used for mid-range woofers.

- Dual power terminals where you can connect dual power feeds or a DLS Power Cap.
- Output for electronically controlled cooling fan.
- RMS output per channel at 13,8 volts, 20 Hz - 20 kHz , < 0,1% distortion.

Specifications

Number of channels	4
Amplifier class	AB
Output power in 4 ohm	4 x 85 W
Output power in 2 ohm	4 x 145 W
Output power in 1 ohm	4 x 220 W
Mono bridge mode 4 ohm	2 x 250 W
Mono bridge mode 2 ohm	2 x 400 W
Damping factor	> 200
S/N ratio, A-weighted	> 100 dB
Frequency range	10 Hz - 50 kHz
Input impedance, high level	N/A
Input sensitivity	0,2 - 7 V
Input impedance	> 10 kohm
Filters channel A & B	LP: 50-125 Hz. HP: 20-200 Hz / 60-600 Hz
Filters channel C & D	LP: 45-200 Hz / 90-400 Hz. HP: 20-200 Hz
Low level output	No
High level input with auto start	No
Dual DC inputs	Yes
External cooling fan terminal	Yes
Power consumption (idle)	1,5 A
Power consumption (max)	95 A
Dimension (W x D x H)	465 x 240 x 73 mm (18,30 x 9,45 x 2,87 inches)
Rec. power cable	Minimum 4AWG / 21 mm2
Weight	6,6 kg ( 14,55 lb)