Усилители мощности стерео — Rotel RMB-1585

The Rotel RMB-1585 is a five-channel power amplifier that the company built for home theater systems, pairing a Class AB circuit with a supply based on two toroidal transformers. It delivers five equal channels from one chassis and ships with rack ears, allowing either free standing placement or mounting into an equipment rack.

Key specs that matter

Rated output is 200 W per channel into 8 ohm with all five channels driven, and 310 W per channel into 4 ohm, which is also the lowest speaker impedance Rotel approves. Total harmonic distortion stays below 0.03% across 20 Hz to 20 kHz, while intermodulation distortion shares that below 0.03% limit. Frequency response runs from 10 Hz to 100 kHz within +0.5 and -3 dB. Signal to noise ratio is 116 dB with IHF A weighting, gain is 26.5 dB and the damping factor is 260. The RCA inputs need 1.9 V for full output and present 12 kilohm, while the XLR inputs need 3.8 V and present 100 kilohm.

Engineering and use context

Energy storage is split across dual toroidal transformers, and the filter stage relies on slit foil capacitors made in Britain. Maximum consumption is 1100 W in operation, falling to 0.5 W in standby, and Rotel lists heat output of 2372 BTU per hour when the amplifier runs into 4 ohm at one eighth of full power. That thermal figure matters when several components share a closed cabinet, so ventilation should be planned before installation. The chassis measures 431 x 237 x 454 mm and weighs 36 kg, and without its feet it occupies 5U, or 221 mm, of rack height. This version is specified for 120 V at 60 Hz mains. Balanced and unbalanced connections on every channel let it take signal from almost any surround processor or AV receiver with preamp outputs.

Pairing

A surround processor or an AV receiver with pre outs is the natural source, and whichever of the two connection types it provides will match one of the input sets. Five channels cover a front left, centre and right set plus two surrounds, and a second amplifier or the receiver's own channels can drive height or rear speakers in a larger layout.

Alternatives

Rotel's RB-1590 is a stereo Class AB design from the same catalogue, rated at 350 W per channel with a damping factor of 300.