ALNER HAMBLIN ELECTRONICS LTD. SA400 STEREO POWER AMPLIFIER Owners Instruction Manual ALNER HAMBLIN ELECTRONICS LTD. 3 BOULTONS ROAD KINGSWOOD BRISTOL ENGLAND BS15 1RU Tel/Fax +44 (0) 117 9614239 E-mail alner@globalnet.co.
SA400 Semi-Digital POWER AMPLIFIER Introduction In 1999, we designed and built the first prototype of this amplifier using the original Tripath evaluation board. The intention then was to compare other emerging digital technologies to decide which was best. To ensure that the comparison was as valid as we could make it, we designed and used a much larger power supply than required and made the amplifier have sufficient gain to not need a preamp.
delivering over 1000 watts into 8 ohms. Please ensure that the Amplifier is switched off before changing the bridge switch position. Throughout the design, the component quality has been chosen to suit the job being performed (there has been no attempt to over specify components for marketing reasons), and ensure that the amplifier can be built at the lowest cost commensurate with the extremely high performance for which it was designed, and operate reliably over a long period.
that the Loudspeaker leads are not short circuit before contacting the Factory for advice. For normal stereo operation, the switch on the rear panel should be in the “stereo” position and the input signal is fed into either the pair of phono sockets or the pair of adjacent XLR sockets. When the amplifier is used as a monoblock, the switch is moved to the “bridge” position and the upper “left” phono socket (or the left XLR socket) is used for the input.
Specification Power Output (1% Distortion, 1kHz, Both Channels Driven, Continuous Average): 8 Ohms 4 Ohms 8 Ohms Bridged 4 Ohms Bridged >300 Watts >540 Watts >1100 Watts >1350 Watts Frequency Response (-3dB): - < 1Hz - >100kHz Distortion (1kHz, 8Ohms, -1dB below full Power): - <0.02% Input Sensitivity (100Watts, 8 Ohms, 1kHz): Internal Jumper Positions: - 1 (Please see drawing) 2 3 (High) (Medium) (Low) 0.5 Volts 1.0 Volts 1.
Safety information Fuse Rating: - T 5A H Use on 50/60Hz 230v A.C. mains only. The Unit must be earthed. Disconnect the mains supply before making any connections. Ensure adequate ventilation around the unit. There are no user serviceable components inside the unit. The covers supplied MUST be fitted to the Output Terminals. Cleaning Use a soft damp cloth to clean the unit. Do not use cleaners or solvents. Do not use an abrasive cloth. Disconnect the unit from the mains supply while cleaning.
Alner Hamblin Electronics Ltd. 3 Boultons Road Kingswood Bristol Tel. +44 (0) 1179 614239 England Fax. +44 (0) 1179 614239 BS15 1RU E-mail. alner@globalnet.co.uk Guarantee Registration For Alner Hamblin Electronics Ltd. Name ............................ Address ............................ ............................ ............................ ............................ ............................ ............................ Postcode ............................ E-mail Address ......................
SA400 Frequency Response versus Load Resistance The graph above shows the frequency response of the SA400 into various load Impedances. The Amplifier has been optimised for a load Impedance of approximately 5.4 Ohms, which will give a flat frequency response to over 100kHz, while still allowing High Power delivery into 2 Ohms should your particular loudspeakers dip this low. The frequency response with load Impedances from 3 Ohms to 10 Ohms is within +/1dB to over 25kHz.
