MC4 är en mycket högklassig step-up trafo från engelska EAR, Esoteric Audio Research.
Finns i butiken för demo!
Hum Rejection: Greater than 60dB
Channel Separation: Greater than 70dB (20-20KHz)
Channel Balance: Less than 0.1dB
Rise Time: 2 μs (any level)
Phase Linearity: Less than ~5 degrees (20 - 20 kHz)
Frequency Response: 3 Hz - 100 kHz +0.2 dB - 1.0 dB
Voltage Gain: x30, x24, x18, x10
Input Impedances: 3 ohm, 6 ohm, 12 ohm, & 40 ohm
Equivalent Noise Contribution: Less than 1dB
"Designed by audio legend Tim de Paravicini, the MC 4 is a bit unusual as step-ups go: It has four primaries, accessed via four different sets of taps on its copper-wound transformers. This gives the device four sets of gains and impedances rather than just one, via four pairs of gold-plated RCA input jacks on the rear panel. Each pair of inputs provides a different impedance -- 3, 6, 12, or 40 ohms -- to produce respective outputs of 30x, 24x, 18x, or 10x the input voltage. For example, the MC 4 increases the 0.3mV output of my Ortofon Anniversary SPU cartridge to 9mV (3 ohm tap), 7.2mV (6 ohms), 5.4mV (12 ohms), or 3mV (40 ohms). This makes the MC 4 incredibly flexible, suitable for use with a variety of MC cartridges with various outputs and internal impedances. Apropos of this flexibility, the rear panel has two grounding posts, each isolated from the signal grounds with a pair of 10-ohm resistors." - Positive Feedback