Pass Labs X250 Stereo Reference Amplifier

R170,000.00 R45,000.00

Review

Despite the powered speaker trend in professional studios, it is reassuring that separate amps like the Pass X250, when combined with state-of-the-art speakers, continue to set the standard for premier amplification when cost is not a limiting factor. Yeah, its $6,000 and not for every studio’s budget. But if you are into listening to the intricate subtleties of recording and mastering, the Pass Labs X250 is an A-list amp.

All of this comes at a high price, but Pass has never been anything but a high performance manufacturer. The power supply is the most expensive part of an amplifier, and the power supply in the X250 is massive, having a 1.2 kVA toroidal transformer, and twenty 10,000 µF capacitors with ± 47 Volts, which provides 221 Joules of energy storage. That is why it doubles its output power from 250 watts into 8 Ohms to 500 watts into 4 Ohms. And, this is with some bias into Class A (the power consumption at idle is 270 watts, which suggests about 25 watts of Class A for each channel).

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Description

Specifications

X250 SPECIFICATIONS
All figures obtained after 1 hour warmup, with regulated 120 VAC power line. See manual
notes about AC power line regulation.

Gain                                    30 dB
Freq. Response                0 dB at DC, -3 dB at 100 kHz
Power Output                   250 watts maximum @ 1% THD, 1 kHz, 8 ohms
Maximum Output Voltage  plus, minus 65 volts
Maximum Output Current   plus, minus 20 amps
Input Impedance               22 kohm balanced, 11 kohm unbalanced
Damping factor                    250 ref 8 ohms nominal
Slew rate                                approx. plus, minus 50 V/uS
Output Noise                       approx. 300 uV unweighted 20-20 kHz
Random noise floor          approximately 2 uV
Dynamic range                      148 dB (random noise floor to peak       output)
Balanced CMRR                     approx. -85 dB@ 1 kHz
DC offset                                    < 100 mv
Power Consumption                  270 watts idle, 1200 watts maximum
Dimensions                               19 ” W x 22″ D x 9.5″ H
Shipping Weight                      110 lbs.

Manual and Specs