New & Improved! Dual Mono output stages, new input stages... A better design with better parts!
Experience more musical resolution and detail, better bass response and a
completely silent background with the Black Cube / Power Cube PWX combination.
Great sound and versatility at a very reasonable price. Two PCB mounted DIP
switches offer adjustable gain and loading options for almost all cartridges.
Three gain levels, version 2 improves parts quality and adds chassis damping.
The Black Cube is a phono stage developed for the analog music lover. The small
box can be placed near by the turntable, and a wide variety of pickup cartridges
can be connected ranging from MC to high-output MM.
The passive RIAA-network of the Black Cube is placed between two linear
amplifier stages - highly buffered special amplifiers by Analog Devices. This
minimizes nonlinearities caused by phase errors that would occur in active
filters. The use of low tolerance WIMA capacitors results in a very stable sonic
impression with a fast attack response, delicate tonal balance and realistic
The external regulated power supply of the Black Cube can be placed up to 2m
away from the audio section. The cable between power supply and audio section is
shielded to keep RFI away from the near noiseless and highly stable supply
voltages. This effect is enhanced by additional supply voltage filtering on the
double sided audio PCB.
Analog guru Michael Fremer gave the Black Cube his highest praise in his Analog
Corner column in the October '98 Stereophile: "...get your hands on the Lehmann
Audio Black Cube. I don't know of anything at or near the price, or maybe even
twice the price, that sounds this good." Stereophile rated Class B.
Key Features of the PWX Power Cube power supply:
• 30VA (=10x Black Cube) high current toroidal transformer with protection coil
between primary and secondary coil filtering away common mode interferences.
This makes the power supply a filter power supply!
• Only top notch electronic parts.
• Ultra fast recovery rectifying diodes
• Advanced series voltage regulation stage
• Output voltage: app. +/- 15VDC
• Double sided pcb
• Detachable Cable with professional 4-pole XLR-connector with gold plated
• Aluminum case. Outer appearance fits the Cube. (just plain and black).
• Dimensions: 230mm (D) x 90mm (W) x 44mm (H).
• All Connectors at the rear side.
To see a picture of the power supply and features
Input Sensitivity for output level of 755mV/0dB: 3,8mV/1kHz (MM), 380uV/1kHz
Gain 1kHz: 46dB (MM), 66dB (MC)
Max. Input Level 1kHz: 32mV (MM), 3mV (MC)
Channel Deviation: typ. max. 0,5dB
Channel Crosstalk: fx=1kHz Greater Than 86dB, fx=10kHz Greater Than 85dB
Input Impedances: 47kOhms/1kOhms/100 Ohms switchable on board the audio PCB. One place for custom impedance on board the audio PCB. One additional hard wire slot for direct effectivity. No soldering required.
Input Capacitance: 100pF
Output Impedance: Less Than 100 Ohms
Impedance Following Stage: Greater Tan 10kOhm recommended
Power Consumption: approximately. 3VA
External Power Supply: +/- 15VDC
Audio Section (W x D x H): 113x108x45mm cubed.
Power Supply (W x D x H): 66x110x55mm cubed.