A400.4 DRAGONFLY
HIGH EFFICIENCY DIGITAL AMPLIFIER
OWNER'S MANUAL
www.altoproaudio.com
Version 1.2 OCTOBER 2007
LTO
R
English
Page 1: ...A400 4 DRAGONFLY HIGH EFFICIENCY DIGITAL AMPLIFIER OWNER S MANUAL www altoproaudio com Version 1 2 OCTOBER 2007 LTO R English ...
Page 2: ...ective Ground Terminal AC mains Alternating Current Hazardous Live Terminal ON Denotes the product is turned on OFF Denotes the product is turned off The apparatus shall be connected to a mains socket outlet with a protective earthing connection The mains plug or an appliance coupler is used as the disconnect device the disconnect device shall remain readily operable CAUTION Describes precautions ...
Page 3: ...table for Studio Application as well as for amplification of compression drivers or full range speakers where a very high SPL is not demanded Enjoy your A400 4 and make sure to read this Manual carefully before operation 2 FEATURES Mountable in a 19 rack unit 1 5U and 1 rack space Digital stereo amplifier 2 Hi fi quality for Studio applications Solid and durable rack mountable configuration Switch...
Page 4: ...dB 8 CLIP SIG LIMIT CH1 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH4 A400 4 DRAGONFLY R LTO POWER ON OFF POWER ON 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH1 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH1 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH1 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH2 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH1 30 12 16 20 1...
Page 5: ...POWER ON 3 In this case a passive mixer with different sound sources connected such as microphone keyboard and electric guitar send the main mix signal to the A400 4 You can connect two pairs of passive PA cabinets such as the LTO ELVIS 10 or ELVIS 12 for a gig in a small Pub Bar or for a small Band rehearsal session SMALL GIG SET UP HOOK UP ...
Page 6: ...When a signal is applied to the input of your A400 4 this LED will light up SPOTLIGHT A400 4 DRAGONFLY R LTO POWER ON OFF POWER ON 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH1 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH1 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH2 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT 30 12 16 20 18 6 22 24 26 28 dB 8 CLIP SIG LIMIT CH3 30 12 16...
Page 7: ...nge and secure signal reproduction that is distortion free The Limiter status can be monitored from the limit led on the front panel of your A400 4 8 Output Sockets Use these 1 4 TRS jacks to connect your speakers 10 AC Input 5 Standard IEC receptacle Connect your A400 4 an AC socket with the supplied power cord Before powering up your A400 4 for the first time make certain the stated power requir...
Page 8: ...completely 4 OPERATION 1 Connect two pairs of PA cabinets or studio monitors to the output of your A400 4 make sure that your A400 4 is switched off and that the volume controls are turned down all the way 2 Connect your A400 4 to a mixer a preamplifier or another source making sure that the gain and volume controls on the mixer are turned down 3 Connect some source such as microphones keyboards o...
Page 9: ...erence near field monitor speakers in smaller studios Your A400 4 is also at home driving high frequency compression drivers or full range PA cabinets or Stage Monitors when enormous SPL is not required Digital amplifiers and switch mode power supply which are parts of your A400 4 are designed to reproduce musical signals with high dynamics high SPL and low distortion For this reason all major Man...
Page 10: ...kHz 0 1 THD Stereo Mode 4 Ohms per channel EIAJ 60 Watt Controls Input Sensitivity 4 Ohms 3dBu FRONT POWER SWITCH CH1 CH2 CH3 CH4 LEVEL knobs REAR CH1 CH2 CH3 CH4 LIMITER Indicators per channel Power On Green LED Limit Yellow LED Connectors of each channel Output 1 4 TRS connector Input COMBO connector Power Supply 190 240 VAC 50 Hz 95 120 VAC 60 Hz SNR Signal to Noise Ratio 76dB Protection Therma...
Page 11: ...d of 1 year from the purchase date if you have completed the Warranty Registration Card in time LTO 3 2 The warranty service is only available to the original consumer who purchased this product directly from the retail dealer and it can not be transferred 3 3 During the warranty service may repair or replace this product at its own option at no charge to you for parts or for labor in accordance w...
Page 12: ...hotocopy translation or reproduction of part of this manual without written permission is forbidden Copyright 2007 Seikaku Group SEIKAKU TECHNICAL GROUP LIMITED NO 1 Lane 17 Sec 2 Han Shi West Road Taichung 40151 Taiwan http www altoproaudio com Tel 886 4 22313737 email alto altoproaudio com Fax 886 4 22346757 ...
