Class A Amplifiers
These are Pass Laboratories ultimate expression of Power Amplifiers, the perfect blend of science and visceral emotion.
If there’s a more emotionally satisfying amplifier anywhere, we’re not aware of it.
The successor to our already lavishly praised and well-regarded Supersymmetry patent. Every technical effort has been made to assure exceptional specifications, among these:
Separate chassis
for lower electromagnetic noise
Power supplies
with greatly enhanced storage capacitance
Banks of redundantly parallel high speed
and soft recovery rectifiers
Noise filters
with improved high frequency
Larger and quieter transformers
Improved passive decoupling
Lower power standby
Input impedances
of 200 k-ohm balanced with negligible capacitance
XA25
XA25
Specifications
The new XA25 offers great sound at slightly lower power, without frills, at a lower price. It embodies new components and innovative circuits coupled with the best elements of the previous generation.
Degeneration, “the other form of feedback”, has been eliminated. The output stage consists of a single pair of 800-watt new-generation output transistors operating push-pull Class A. The result is faster, lower distortion, lower noise, higher damping, and larger Class A operating envelope into low impedance loudspeakers, all in a simple 3-stage circuit with a total of three pair of push-pull gain transistors.
Class A
Type Stereo
Gain(dB) 20
Inputs RCA
Power Output /ch (8 ohm) 25
No Output devices (/ch) 4
Power Consumption (Watts) 240
Standby Power Consumption (W) <1
Dimensions (W x H x D). 19 x 7.6 x 21.2
Number of Chassis 1
Unit Dimension (W x D x H) (In.) 17 x 17.25 x 6
Unit Weight (LBS) 48.5
XA30.8
An exceptional stereo power amplifier on many levels -- high-biased MOSFETs providing higher-power class A operation, direct-coupled front-end circuitry for exceptionally high stability, and larger, more robust heatsinks similar to those of the larger .8 amplifiers. The list goes on, but listening may tell you the XA30.8 represents a value high-point -- quite possibly your particular optimal balance between performance and cost.
XA30.8
Specifications
Class A
Type Stereo
Gain(dB) 26
Full Pwr @ 26 dB gain (V) 0.77
Low Frequency Response. 1.5 Hz
High Frequency Response 100 KHz
Power Output /ch (8 ohm) 30
Input Impedance (SE & BAL Kohms) 50/100
Standby Power Consumption (W) 150
Power Consumption @ Idle (Watts) 370
Unit Dimension (W x D x H)(In.) 19 x 21.25 x 7.5
Weight (LBS) 88