W4S ST Stereo Amp Wyred4Sound ST Stereo Power Amplifiers

The ST series amplifiers offer a huge range of flexibility. With balanced outputs ranging from 125-570 watts in 8 ohms, and 195-1140 watts in 4 ohms per channel! Each channel of the amplifier has independent inputs for a balanced or unbalanced connection which are easily selected by the selector switch on the rear of the unit. The stereo is basically 2 mono amplifiers in one chassis, a true dual mono. The only common connection between the channels besides the chassis is the AC power. Our proprietary input stage was designed for optimal performance, and transparency. The dual, balanced FET input stage offers excellent integration with any source, with maximum openness. Connection of these amps to a tube type source provides outstanding results. When paired with our STP-SE it is a match made in heaven!

"Wyred4Sound has gone to great lengths to earn your business. They are offering near state-of-the-art technology and performance at mid-level prices. By any realistic definition, the STI 1000 is a bargain. The preamp will appeal to those looking for the 'straight wire with gain' approach. It will not create warmth but convey it. The line stage alone would probably warrant the price of admission. The amplifier has virtually unlimited power and a high pedigree. If your loudspeakers are relatively sane loads, the sole caveat I have expressed will not apply and it will be happy to display its HighEnd credentials."

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Wyred4sound ST Series Specifications

 

ST-250

ST-500

ST-1000

Typical THD+N 8ohm (10W out)

0.009%

0.005%

0.008%

 

per channel

per channel

per channel

Power Output 8ohm @ 0.2% THD+N

100W

250W

570W

Power Output 8ohm @ 1.0% THD+N

125W

320W

615W

 

 

 

 

Power Output 4ohm @ 0.2% THD+N

195W

550W

1,140W

Power Output 4ohm @ 1.0% THD+N

220W

625W

1,225W

 

 

 

 

IMD (CCIF)

0.0005%

0.0005%

0.0005%

Transient Intermodulation (TIM)

0.004%

0.003%

0.005%

Output Idle Noise

90uV

80uV

80uV

Efficiency 4ohm

78% @ 200W

80% @ 500W

78% @ 1000W

Efficiency 8ohm

79% @ 100W

77% @ 200W

77% @ 500W

Frequency Response  20Hz--20kHz

กำ 0.4db

กำ 0.3db

กำ 0.4db

Lower Bandwidth

3.5Hz all loads

3.3Hz all loads

3.3Hz all loads

Balanced Input Impedance

60.4k?

60.4k?

60.4k?

Unbalanced Input Impedance

60.4k?

60.4k?

60.4k?

Dynamic Range

110db

115db

118db

Gain

27db

27db

27db

Sensitivity

1.28V

2.1V

2.9V

Output Impedance

0.010ohm

0.005ohm

0.005ohm

Min Load

3ohm

2ohm

2ohm

Damping Factor (100Hz 8ohm)

4000

2000

2000

Max Output Current

11A

35A

40A

Channel Tracking

< +/- 0.1 db

< +/- 0.02 db

< +/- 0.02 db

Crosstalk (20-20kHz)

> 121 db

> 106 db

> 119 db

Idle power consumption

10w

20w

30w