Universum System 7500 SL (V 2315) specifications

This amplifier (V 2315) is part of the Universum System Hifi 7500 SL, it was on sale for the first time in 1981. In addition, a tuner, a turntable and tape decks in different variants were offered in a coordinated design.

The amplifier was manufactured in two different versions at that time. The first version had a surround sound device, with the help of which a so-called "4D quadro surround sound" could be generated. In addition to the usual stereo speakers, two rear effect speakers were required for this. A later version of this amplifier no longer had this spatial sound function, instead a "mute function" was implemented in the device.

Special features of this device were its liquid-cooled power amplifier(heat-pipe), a solid front made of aluminum, as well as a comparatively flat housing design. Probably in this context there is the addition of the name "SL", which was called "Slim-Line" in the advertising for this series at that time.

Technical data:

Rated power at 1 kHz: min. 2x60 Watts at 4 ohms

Music power: min. 2x100 Watt

Total harmonic distortion at rated power: 0.5%

Intermodulation: 0.1 at full control according to DIN 45403 (250 HZ + 8 kHz, 4:1)

Loudspeaker damping factor: 20

Loudspeaker minimum impedance (connection value): 4 Ohm

Transmission range: 20 Hz to 40 kHz

Power bandwidth: 30 Hz to 40 kHz

Crosstalk attenuation between the two channels: 45 dB at 1 kHz, 35 dB from 250 to 10 000 Hz

Crosstalk attenuation between the different channels. Inputs: 55 dB at 1000 Hz, 45 dB from 250 to 10 000 Hz Synchronization of the NF part (left/right channel): less than 2 dB

External voltage distance for rated power: 74 dB

External voltage distance for 50 mW: 60 dB

Control ranges:

Height controller: + 10, - 10 dB at 10 kHz

Depth controller: + 10, - 10 dB at 100 Hz

Balance controller: - 40 dB

Input sensitivity and impedance at 1 kHz for rated power: TB/Monitor: 350 mV/500 kOhm

Magnet-TA: 3.5mV/50 kOhm

Dynam.- TA: 0.2mV/0.1kOhm

Tuner: 350 mV/500 kOhm

Max. Input Voltage:

TB/Monitor: 5 V