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REF501S Stereo Amplifier The REF501S stereo amplifier, solidly built all-aluminum compact chassis, delivers dynamic, accurate hi resolution sound at 250 Watts with incredible speed and control. Max Power Output 250W @1% THD per Channel Minimum Load: 2 ohms per Channel Peak Output Current: 17.5 Amps per Channel Balanced Input Impedance: 95 Kohms Voltage Gain 27dB

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REF501S

REF501S Stereo Amplifier

The REF501S stereo amplifier, solidly built all-aluminum compact chassis, delivers dynamic, accurate hi resolution sound at 250 Watts with incredible speed and control.

  • Max Power Output 250W @1% THD per Channel
  • Minimum Load: 2 ohms per Channel
  • Peak Output Current: 17.5 Amps per Channel
  • Balanced Input Impedance: 95 Kohms
  • Voltage Gain 27dB

REF501S Stereo Amplifier Features

Impedance Optimized Input Stage uses selected precision resistors in a balanced high Common Mode Rejection, low output impedance driver that is critical to the amplifier's performance, ensuring that the refined dynamic qualities of the recording are preserved.

DC Signal Path

The REF501S is DC coupled with no coupling capacitor in the signal path. This optimizes the audio signal quality and maximizes both micro and macro dynamic performance. The amplifier will protect itself and your speakers if excess DC is detected with very fast shut-off.

At the Core

High speed ultra-efficient switch mode amplification delivers literally unheard-of levels of performance using an innovative 5th order loop filter. This technology provides extremely low noise and distortion performance over the entire audio bandwidth, allowing the musical message to come through unchanged and with remarkable purity.

Why Class D?

Well-designed Class D switching supplies generally sound more open through the midrange with better Bass control. Note that 250W is 23.9dBw which means that it will drive an 85dB speaker to 108dB with 111dB peaks, theoretically. In a large room with the volume control 10dB below max we’re measuring about 25W of continuous power. This is loud! Most power concerns are more about control rather than how much real power is delivered. This gives further advantage to Class D and switching power supplies as their efficiency is high even at lower power outputs helping them sound ‘bigger’.

WBT NextGen Speaker Connectors

The WBT NextGen connectors provide the best possible connection from the amplifier to the speaker cables. We choose them because they impart minimal sonic signature to the sound, remaining open and grain-free up throughout the audio frequency band.

Specifications

Power Output 1% THD

250W per channel

Minimum Load

2 ohms per channel

Peak Output Current

17.5 amperes per channel

Frequency Response

+/-3 dB 0Hz-50KHz, 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

Damping factor

>1000

Output Impedance at 100H

<8 milliohms

Dynamic Range

121dB

Input Voltage for Max Output

1.4Vrms

Input connections

Single-ended RCA or balanced XLR

RCA input impedance

47Kohms

Balanced input impedance

95Kohms

Output connections

2-sets WBT Nextgen 5-way binding posts

Power On usage

12W

Power Off usage

0.0W

Internally Set Operating Voltages

100-120VAC or 230-240VAC 50/60 Hz

Size

8.5 x 3.5 x 12[inches], 216 x 88 x 305[mm] (WxHxD)

Weight

12 lbs, 5.5 Kg

 

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