The REFERENCE amplifier employs an extremely efficient Auto High CorrwPpower supply (patent pending). A/RBASSTM Upgradable - This feature allows RF remote control leveladjustment while the low pass filter on the amplifier’s internal crossoveris being used. The 6-pin DIN plug carries (+)and (-) signal information for left and right channels, audio ground, andf15 Vdc to operate the Soundstream BLT” or BLT4TM Balanced LineTransmitters. True Balanced Input (Reference644s only) for professional-qualityperformance and noise cancellation. Differential Balanced Input Design for added immunity to noisecaused by component and vehicle electrical system interaction whenusing unbalanced RCA inputs. The Reference414s has a single input range, varying from 200mV to 5.0 V. Flexible Dual Input Level Sensitivity (Reference644s only) accepts2 voltage ranges from 200 mV to 2.0 V and from 500 mV to 5.0 V.permitbng maximum output from the amplifier with virtually any sourceunit. Drive Delay TM Muted Turn-on/off Circuit - A unique circuit whichcompletely eliminates any amplifier-related turn-on/off noises. Dual Discrete Class A Drive Stages -Over 12 times the drive currentof most amplifiers, which maintains performance into low impedanceloads. 1 ohm Drive Ability - (Reference414s only) The REFERENCE414samplifier is designed to drive virtually any load-all the way down to 1ohm stereo (Zohm mono). l/2 ohm Drive Ability - (Reference644s only) The REFERENCE6445amplifier is designed to drive virtually any load-all the way down to l/2ohm stereo (1 ohm mono). L Fault Monitor LED on the top panel notifies you of blown power supplyfuses. If overheating should continue, a second thermal sensingprotection circuit will shut off the amplifier if the heatsink reaches 95” C. Once the amplifier has cooled off, it returns to full poweroutput. In the unlikely event the REFERENCE amplifier reaches 85”C, it will gradually roll back its average power (without affecting thedynamics). Ultra-Low ESR Capacitance Bank Multiple small input powercapacitors are used to provide lower ESR (Equivalent SeriesResistance), which means more power in and out fasfer.ĩ Smart Thermal RollbackTM - Most amplifiers shut off when they gettoo hot. L PowerGridTM Power Supply Design - All power supply componentsare located near one another, connected by thick, wide PCB traces,which ensures rapid, high current delivery The entire power supply isisolated on one side of the circuit board while the audio stage is locatedopposite it, guaranteeing minimal noise. The transistors aresandwiched between the circuit board and the heatsink in a designcalled ChassisinkTM to ensure cool, efficient amplifier operation. L ChassisinkTM Darlington Power Array Soundstream’s “overbuilding”of the output section incorporates multiple output transistors instead ofa few for faster, stronger power delivery. L Coherent StereoTMIMixed Mono selection for either “pure” stereooperation or mixed mono for simultaneous stereo and mono. L Auto High CurrentTM - Soundstream’s exclusive circuit whichautomatically customizes your ampl i f ier to i ts part icularapplication-High Current, low impedance loads (multiple subwoofers.less than 2 ohms mono) or High Power, higher impedance loads (2ohms mono and up). L Uncompromising Design and Construction including mil-spec glassepoxy circuit boards and high current custom gold-plated solid brassconnections that will accept up to 4 gauge power/ground wire. 11īalanced / Unbalanced Input (Reference644s). High Power/Auto High CurrentTM Power Supply Design. Should your amplifierever need service or replacement due to theft, please record thefollowing information. Soundstream amplifiers are the result of American craftsmanship and thehighest quality control standards, and when properly installed, willprovide you with many years of listening pleasure. Pleaseretain this manual and your sales and installation receipts for futurereference. To maximize the performance of your system, we recommend that youthoroughly acquaint yourself with its capabilities and features. Your SoundstreamREFERENCE amplifier will outperform any other amplifier in the world. YOU now own a REFERENCE Amplifier, the product of anuncompromising design and engineering philosophy.
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