The S300iu raises performance expectations for an integrated audio amplifier. The S300iu integrates a high performance preamplifier with 300 Watts of dual mono balanced power capability per channel. It utilizes the same amplifier and power supply technology as the S300 to deliver remarkable fidelity and power for any system. The dual mono regulated switching supplies provide unprecedented performance in a compact package. Comprehensive parallel protection circuitry for over-current and thermal overload protects your investment while staying completely out of the signal path.

The high performance preamplifier uses the latest digitally controlled analog volume control and sealed relay switching to provide a transparent signal path for up to 4 analog inputs, including a USB Digital Audio converter and record and main preamp outputs. The USB DAC allows you to create a high performance audio playback system using your computer as the audio source.

   *  Ultra-wideband, low distortion true balanced output buffer stage with selected audio grade resistors

   * 100 dB of level control in accurate 0.5 dB steps

   * 5-RCA, 1 XLR input

   * XLR main, RCA main and buffered RCA record outputs

   * Dual low noise toroidal power transformers for control/display and analog stages

   * Multi-stage regulation with ultra-wideband, low noise audio stage regulation

   * 4-layer board design for optimized ground, signal and power routing

   * Single sealed telecom grade control relay in the signal path

   * DC coupled design with no signal path capacitors

The S300 raises performance expectations for an  audio power amplifier. The S300 integrates a high performance with 300 Watts of dual mono balanced power capability per channel. It utilizes the same amplifier and power supply technology as the S300 to deliver remarkable fidelity and power for any system. The dual mono regulated switching supplies provide unprecedented performance in a compact package. Comprehensive parallel protection circuitry for over-current and thermal overload protects your investment while staying completely out of the signal path.

Power Output:   500W 4 ohms, 250W 8 ohms

Power Output 1% THD:  370W 4 ohms, 200W 8 ohms

Minimum Load:  3 ohms

Frequency Response:  +/-3 dB 1.5Hz-70KHz, all loads

THD+N:  0.003% 1W, 1KHz, 4 ohms

IMD (CCIF):  0.0003%, 1W, 14:15KHz, 4 ohms

Output noise:  35uVRMS A-weighted 10Hz-20KHz

Voltage gain:  27dB (single ended or balanced input)

Damping factor:  >1000

Output Impedance at 100Hz  <8 milliohms

Dynamic Range:  121dB

Input Voltage for Max Output  2Vrms

Input connections:  Single-ended RCA or balanced XLR

RCA input impedance:  100Kohms

Balanced input impedance:  200Kohms

Output connections:  1-set WBT 5-way safety binding posts

Standby Power:  19W

Size:  8.5x3.5x12[inches], 216x76x305[mm] (WxHxD)

Weight:  15lbs, 7K

Power Output:   500W 4 ohms, 250W 8 ohms

Power Output 1% THD:  450W 4 ohms, 225W 8 ohms

Minimum Load:  3 ohms

Frequency Response:  +/-0.5dB 20Hz-20KHz, all loads

THD+N:  0.003% 1W, 1KHz, 4 ohms

IMD (CCIF):  0.0003%, 1W, 14:15KHz, 4 ohms

Output noise:  35uVRMS A-weighted 10Hz-20KHz

Voltage gain:  27dB (single ended or balanced input)

Damping factor:  >1000

Output Impedance at 100Hz  <8 milliohms

Dynamic Range:  121dB

Input Voltage for Max Output  2Vrms

Input connections:  Single-ended RCA or balanced XLR

RCA input impedance:  100Kohms

Balanced input impedance:  200Kohms

Output connections:  1-set WBT 5-way safety binding posts

Standby Power:  9W

Size:  8.5x3.5x12[inches], 216x76x305[mm] (WxHxD)

Weight:  15lbs, 7Kg

Power Output:   >1000W into 4 ohms, >500W into 8 ohms

Minimum Load:  2 ohms

Frequency Response:  +/-0.5dB 20Hz-20KHz, all loads

THD+N:  0.007% 1W, 1KHz, 4 ohms

IMD (CCIF):  0.0007%, 1W, 14:15KHz, 4 ohms

Output noise:  90uVRMS A-weighted 10Hz-20KHz

Voltage gain:  27dB (single ended or balanced input)

Damping factor:  >1000

Output Impedance at 100Hz  <8 milliohms

Dynamic Range:  120dB

Input Voltage for Max Output  3Vrms

Input connections:  Single-ended RCA or balanced XLR

RCA input impedance:  100Kohms

Balanced input impedance:  200Kohms

Output connections:  1-set WBT 5-way safety binding posts

Standby Power:  15W

Size:  8.5x3x12[inches], 216x76x305[mm] (WxHxD)

Weight:  15lbs, 7Kg

Power Output:    300W into 4 ohms, 150W into 8 ohms

Minimum Load:  4 ohms

Frequency Response:  +/-0.5dB 20Hz-20KHz, all loads

THD+N:  0.01%, 1W, 1KHz, 4 ohms

IMD (CCIF):  0.002%, 1W, 14:15KHz, 4 ohms

Output noise:  90uVRMS A-weighted 10Hz-20KHz

Voltage gain:  27dB (single ended or balanced input)

Damping factor:  >1000

Output Impedance at 100Hz  <8 milliohms

Dynamic Range:  111dB

Input Voltage for Max Output  1.5Vrms

Input connections:  Single-ended RCA or balanced XLR

RCA input impedance:  10Kohms

Balanced input impedance:  20Kohms

Output connections:  WBT 5-wway safety binding posts

Standby Power:  5W

Size:  8.5”x3”x12”, 216mmx76x305mm (WxHxD)

Weight:  9lbs, 4Kgay safety

Powerful amplifiers can more faithfully reproduce the dynamics of the music, enabling the user to have a wider choice in the selection of loudspeakers, particularly when less efficient models are being considered.

Power is something that this 99 mono power amplifier has in abundance. Into a nominal 8 ohm load it delivers well over 150 Watts and a breathtaking 220 Watts into a 4 ohm load. In all other respects, this amplifier is close to the 99 stereo power amplifier and shares its technology and topology as well as its excellent standards of performance.

The 909 Stereo Power Amplifier incorporates Quad’s patented current dumping technology and is one of the finest audio amplifiers available today. The current dumping technique eliminates many of the problems associated with transistor amplifiers giving a consistent and predictable performance without a need for the fine tuning adjustments on the production line. In current dumping amplifiers there is a very high quality low power output amplifier and a very high power output amplifier whose performance is not critical. This high power output amplifier controls the loudspeaker at all times and provides the current or ‘muscle’ to generate the sound. The low power output amplifier is arranged to generate a signal that compensates for errors between the input signal and the signal fed to the loudspeakers. The result is that the quality and accuracy of the output signal depends only upon the performance of the low power amplifier. In the Quad 909 this low power output amplifier has been engineered to the highest standards.

State of the art performance combined with unique operating features sets the Quad 99 Pre-Amplifier apart from competing products. The combination of universal phono-socket connectors and Quad link inputs gives the ability to connect an almost unlimited number of sources each with optimal matching. All inputs including those for moving-coil and moving-magnet cartridges have adjustable sensitivity. This flexibility also extends to the wide range of precise tone-control adjustments that can be made. In addition to the usual high-frequency filter, there are adjustments for the bass response, and the unique Quad ‘Tilt’ control which skews the entire frequency response to give a preferred tonal balance. The Quad 99 Pre-Amplifier is packed with technical innovation including noiseless solid state signal switching and digitally addressed analogue volume and balance controls. These track both left and right channels with a previously unattainable accuracy of better than 0.1dB.

Quad power amplifiers have always been amongst the finest in the world. Over the years, they have earned a reputation for being ‘straight wires with gain’, because they neither add nor take anything away from the original music signal. The 99 stereo power amplifier maintains this tradition. It uses a dual complementary feedback circuit with exceptional stability margins to achieve exemplary performance and an output of over 80 watts per channel. Overload recovery is instantaneous and the amplifier is fully protected against over-driving or misuse, without resorting to output line fuses or relays, which degrade the quality of the signal fed to the loudspeakers. The 99 stereo power amplifier can be safely used to drive most types of loudspeaker, both Quad’s own electrostatic models and conventional

models made by both Quad and other manufacturers.