Class A+D Stereo Amp bridgeable into a 290W mono amp
The NuPrime STA-9, a 2 X 120W Class A+D stereo amp, bridgeable into a 290W mono amp, is designed with enhanced even-order harmonic circuitry that mimics the most attractive features of tubed-amp sound without incurring tubes’ drawbacks and limitations. The STA-9’s spacious, transparent, dynamic and luxuriously textured soundstage has to be heard to believe.
The STA-9 amplifier is derived from the ULCAM (Ultra Linear Class A Module)+Class D design first introduced in the IDA-8. By joining a powerful high impedance singled ended amplifier circuit in the preamp stage with a well integrated Class-D power stage, the STA-9 delivers a rich tube-like sound with the remarkable speed and clarity of NuPrime Class-D design. Audio enthusiasts are bound to be impressed.
Single End Class A + D amplifier design Bridgeable allowing switch between stereo or mono mode. Enhanced even-order harmonic (H2) circuitry resembling the most attractive features of tubed-amp sound without its drawbacks and limitations. Highly reliable under no-load condition and enhanced short circuit protection. High output current drive capability for low impedance speakers. 550 KHz switching frequency for accurate reproduction of musical signal. New linear power supply with a high-efficiency toroidal transformer. Reduced high-frequency noise and strengthened low-frequency performance. Signal path avoids cross-linking capacitors, thus achieving a frequency response at DC level for pure musical enjoyment.
The NuPrime Sound
Vast soundstage Wide, lightning-fast dynamics Ultra-low distortion and noise Music emerges from a pristine background, with delicate details and nuances intact
In summary, NuPrime’s sonic character stands well apart from – and indeed above – the soft, cushy sound we often associate with most tubed amplification or the dry, clinically edgy sound we often associate with solid-state and switching technology. Rarely does an amp achieve an ideal balance of richly textured timbres and harmonics, bottom-end authority, startling dynamics, exquisite low-level detail, and a fully revealed, fully dimensional soundstage against a backdrop of mile-deep silence.
RCA: Un-Balanced input x 1
XLR: Balanced input x 1
Stereo Speaker Out x 1 or
Mono Speaker Out x 1
Power: 2 X 120W / 1 X290W @ 8 & 4 Ohms
Peak Output Power: 2 X 280W / 1 X 320W @ 8 & 4 Ohms
Input Impedance: 47k Ohms
Input sensitivity: 232.8mV, 1W @ 8 Ohms; 1.4V to rated power
Gain: x 22 (x 42 for mono)
Signal to Noise Ratio: < -95dB at 1W, 10W, 100W
Dynamic range: -115dB to 0dB at 1kHz
THD+N: 0.02% (Stereo) / 0.01% (Mono)
Frequency Response: 10Hz to 50kHz
Worldwide AC voltage: (115 VAC / 230 VAC) with Voltage Select Switch
AC Fuse: Slow-blow, 3A, 250VAC
Dimension:235 mm W x 281 mm D x 55 mm H (including feet)
Weight: 4.75 kg
Color: Black or Silver
In a 110V outlet, the idle-power consumption is below 14W. In a 230V outlet, the idle-power consumption is below 16W.