Sprout features a phono preamplifier for vinyl, a Bluetooth receiver for music streamed from smartphones, a high-quality hi-res DAC to handle anything stored on a computer, enough power for any speaker, and a headphone amp that drives even the toughest loads. Roughly the size of a large novel, Sprout100 is a source of music for those who want quality sound without the hassles that come with it.
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The Pre Amp
At the heart of the Stellar Gain Cell is its analog preamplifier section called the GainCell, a unique approach to solving a classic problem for preamplifier designers, the volume control. All preamplifiers must provide a means for the volume level to be turned up or down. Typically this is accomplished by inserting a mechanical or electronic element in the signal path which degrades the musical signal to some degree. PS Audio’s unique GainCell solves the sonic losses associated with classic volume controls by using a different technology known as a variable gain amplifier. Instead of adding additional circuitry to the signal path to vary loudness, the preamplifier’s actual amplifier stage varies its gain in response to the user’s front panel volume control. This method requires zero additional circuitry in the signal path, thus eliminating the need for additional circuitry that loses musical information. Stellar’s GainCell’s sound is rich, full and engaging in ways few preamplifiers can claim. From the quietest micro-dynamics to the loudest macro-dynamic passages, Stellar’s GainCell outputs gorgeous music through either its balanced or single ended outputs or its headphone amplifier. Music takes on new life through the GainCell.
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Inputs
To ensure the best possible vinyl reproduction, we engineered a brand-new hybrid circuit design that incorporates a JFET input stage, to lower noise and increase headroom, and a passive high-frequency RIAA circuit, for extended and nuanced high-frequency response. Optimized to the cutting edge of digital playback, Sprout100 also employs an ultra high-resolution ESS Sabre DAC (9016) with USB-B input that accepts resolutions up to PCM 384/24 and DSD128: bit-perfect playback for your high-rez computer audio, video, and gamin applications. An optical (toslink) input allows you to incorporate a TV or other modern digital device with your new system. Bluetooth offers versatility, convenience, and one-touch access to a world of content.
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Power
Equiped with bleeding-edge ICEpower amplifier technology, the Sprout100 offers 100 watts per channel, with peaks of up to 135 watts per channel. The Sprout100 also features a built-in subwoofer output (mono RCA, variable), allowing you all the rumble you want with the powered subwoofer of your choosing. With one of the finest headphone amplifiers made, the Sprout100 honors and respects the music with a low-impendance z-feedback circuit that is capable of driving virtually any pair of headphones you can throw at it with perfect transient impulse response. Slewing at an unheard of 1,300-volts/microsecond, the Sprout100’s headphone amp produces lucid spatial detail and acute tonal retrieval.
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Application
Sprout100’s ease of use makes it appealing and accessible to those who would find most audio gear intimidating. Sonically notable for its lucid spatial detail, acute tonal retrieval, and commanding noise immunity, Sprout100 is equipped to drive your loudspeakers and headphones better than ever. For those seeking a better, simpler way to play music in their home, Sprout100 will fill your living room, bedroom, or any room with enormous, live sound. Sprout100 provides quality without complication.
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Specifications – Gaincell DAC
Physical |
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| Unit Weight | 2.9 lbs [1.3 kg] |
| Unit Dimensions | Width 6.2″, Height 1.9″, Depth 8.2″ (chassis only, not including knobs) or 9.2” (including connectors and knobs) |
| Shipping Weight | 5lbs [2.2 kg] |
| Shipping Dimensions | Width 10.5″, Height 5″, Depth 14″ |
Power requirements |
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| Voltage Options | 100-240 VAC, 50-60Hz, Auto-Detect |
| Power Consumption | 280W Maximum |
| Mains Power Input | IEC C14 |
Phono Audio Input |
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| Connector | 1 Stereo Pair, Phono RCA |
| Cartridge type | Moving Magnet |
| Cartridge Output | 3mV-10mV (5mV recommended) |
| Cartridge Loading | 47KΩ (100pF) |
| EQ Type | RIAA |
| Gain | +40dB |
| S/N ratio | >84dB A-weighted (analog output) |
Analog Audio Inputs |
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| Connector | 1 Stereo Pair, Line Level RCA |
| Maximum Input level | 2.1VRMS (+6.44dBV) |
| Input impedance | 10KΩ |
Analog Audio Output |
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| Connector | 1 Stereo Pair, Line Level RCA |
| Output level, maximum | 3.0VRMS (+9.5dBV) |
| Output Max Gain (using Analog Inputs) | 8.45dB |
| S/N ratio | >105dB (3VRMS ref) |
| THD (Analog) | <0.01% (1VRMS, 1KHz) |
S/PDIF Digital Input |
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| Connector | Optical (Toslink) |
| Format | PCM (96KHz max), 24 bits |
USB Input |
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| Connector | USB “B” Type |
| Format | PCM (384KHz max), 24 bits, DSD64 (DoP), DSD128 (DoP) |
| Transfer mode | Asynchronous |
Bluetooth |
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| Antenna | Built in |
| DAC | Uses Sprout’s built in asynchronous DAC over S/PDIF (ESS Sabre 9016 DAC) |
Stereo Power Amplifier Output |
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| 8Ω loudspeakers connected | 50 watts per channel, both channels driven |
| 4Ω loudspeakers connected | 100 watts per channel, both channels driven |
| THD (Speaker Output) | <0.01% (1W, 1KHz into 4Ω) |
| Frequency Response | +/- 1dB (1VRMS out, 20Hz – 20Khz into 4-8Ω) |
| Signal to Noise | >100dB at max power into 4Ω |
Headphone Output |
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| 32Ω headphones connected | 500mW |
| 300Ω headphones connected | 125mW |
| THD | <0.01% (1KHz, 50mW into 32 Ω) |
| Signal to Noise | >105dB at max power into 300Ω |













