
T-50SPA Stereo Power Amplifier
Smooth, refined and exceptionally controlled power delivery
Performance
Simplified, streamlined, yet masterfully designed, Quiescent Power Amplifiers expertly address the issue of providing abundant power without adding noise. Fully vibration protected, with radio frequency and interference-reducing components, each Quiescent power amplifier works with speed and precision for sublimely-detailed, beautifully-nimble sound and superbly-enhanced imaging.
Technology
Using current feedback with exceptionally high bandwidth and a minimal component count, this solid-state class A/B stereo power amplifier is capable of giving a gripping and propulsive performance way beyond that suggested by its power rating.
Power amplifiers are often severely disadvantaged by high levels of microphonic noise, robbing the signal of dynamic energy and accuracy. During the development phase, our primary objective of this design was to prevent these effects.

Specifications
Rated at 50W per channel into 8Ω, the T-Series Stereo Power Amplifier drives effortless power into the most demanding loads thanks to its patented QPower technology.


Technology
Using current feedback with exceptionally high bandwidth and a minimal component count, this solid-state class A/B stereo power amplifier is capable of giving a gripping and propulsive performance way beyond that suggested by its power rating.
Power amplifiers are often severely disadvantaged by high levels of microphonic noise, robbing the signal of dynamic energy and accuracy. During the development phase, our primary objective of this design was to prevent these effects. The culmination of this work has achieved this goal in four ways:
- With a robust power supply employing a custom-wound 500VA transformer and low-microphonic components, all fully coupled to vibration absorption technology.
- By using significant vibration protection in and around the sensitive analogue input stages.
- By employing a dual-mono topology. Critically, this includes independent low resonance, acoustically disruptive heatsinks for the left and right output devices.
- Exceptionally high quality filter capacitors resulting in a low impedance and highly responsive power supply
Casework is machined using high-grade aluminium and uses Quiescent proprietary techniques for managing vibration and electrical noise preventing signal damage in the sensitive circuitry. The top of the unit is a high-grade non-metallic plate preventing the unwanted effects caused by the Faraday cage.
Addressing the problems of vibration allows us to maximise the other key features of the amplifier. Current feedback and high bandwidth offer speed and precision that is detailed and transparent with exceptionally low phase error resulting in superb imaging and soundstage. Additionally, extensive EMI and RFI reduction throughout keeps noise and RF intermodulation very low for an extremely low noise floor.
Specifications
Audio Outputs
Minimum Load Impedance
2Ω
Power Output
50W per channel into 8Ω
Frequency Response
-3dB at 0.5Hz to 1.5MHz
Slew Rate
53V/us
Terminals
WBT nextgen™ Ag Silver conductor binding posts
Audio Inputs
Input Impedance
10KΩ
Sockets
2 x WBT nextgen™ Ag Silver conductor phono
2 x XLR
Grounding
Chassis
M5 Binding post on rear panel
Signal
RCA socket on rear panel
Casework
Finish
Bead blasted natural or black anodised high grade aluminium and non metallic top
Cooling
Passive custom-built Quiescent heatsinks
Dimensions (HxWxD)
140 x 440 x 400mm
Weight
26Kg
Power
Input
115V or 230V, 50 or 60Hz
Consumption
45.8W (Idle)
TBD W (Max into 8 Ohm resistive load)