Усилители мощности моно — Goldmund TELOS 5500 NEXTGEN

The TELOS 5500 NEXTGEN comes from the Swiss firm Goldmund as a one-channel amplifier, built as a single tall tower and listed by the maker as the heir of the earlier Telos 5000+. Goldmund now files it under its previous collection, so it is a model that has left the current range rather than a new release. One tower handles a single speaker, which means stereo playback calls for two units.

Key specs that matter

Goldmund rates maximum output at 1000 W RMS into 8 ohm at 1 % THD under the IEC 60065 method. THD plus noise stays below 0.005 % across 20 Hz to 20 kHz at 30 V RMS output with no load, and SMPTE intermodulation distortion is under 0.01 %. The damping factor is 600, measured at 1 kHz into 8 ohm. Residual output noise is under 3 microvolts across the audio band with the RCA input shorted, and dynamic range is quoted at 116 dB in a 22 kHz bandwidth. Voltage gain is 35 dB with an adjustment range of plus or minus 9 dB in 3 dB increments, with each input trimmed on its own. The analogue inputs accept up to 2 V RMS before clipping, and the digital input reaches 0 dBFS. Nominal consumption is 640 W, taken at one eighth of rated power into 8 ohm. The tower measures 390 mm wide, 470 mm deep and 930 mm high and weighs 260 kg.

Engineering and use context

Output devices are lateral MOSFET transistors, which Goldmund chooses so that its amplifiers run well past the conventional audio bandwidth. A linear supply feeds them through low-noise toroidal transformers, fast diode rectifiers and oversized filter capacitors. Compared with the Telos 5000+, the input stage was redesigned, and both analogue and digital connections are fitted as standard. The rear panel carries an unbalanced RCA input, a balanced XLR input, a digital RCA input with a matching digital RCA output, and an RS232 port for external command. Speaker cables attach to two 5-way binding posts or to two Goldmund Lemo speaker sockets. The amplifier runs on 115 V or 230 V mains and tolerates a 15 % deviation up or down, uses a universal three-pin 16 A power inlet, and Goldmund covers it with a 36-month warranty.

Pairing

The digital RCA input lets a Goldmund source or preamplifier feed the tower directly in the digital domain, while the XLR and RCA inputs serve a conventional analogue preamplifier. Since the gain can be trimmed per input, levels from different front ends can be matched at the amplifier. Two Lemo sockets suit Goldmund loudspeakers built for that connector, and the 5-way posts take any other passive speaker. Given the weight of each tower, the floor and access route need planning before delivery.

Alternatives

The Goldmund Telos 1000 NextGen belongs to the same NextGen family as a lighter single-channel amplifier.