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T-50SPA Stereo Power Amplifier

Smooth, refined and exceptionally controlled power delivery

Apex Speaker Cables_Catalog copy

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Quiescent-82719-E

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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.

Quiescent-82694-E

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.

QD-2600-Quiescent-83219-E-E-E
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QD-2600-Quiescent-83232-E

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

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)