Усилители мощности стерео — Rotel RMB-1506

The Rotel RMB-1506 is a six-channel Class AB power amplifier that Rotel positions for less elaborate multizone audio systems. It can be combined with a Rotel surround receiver or preamp/processor to carry music into three additional living areas, or zones, of a home, with each zone using a pair of its channels.

Key specs that matter

Rated output is 6 x 50 W into 8 ohms with all channels driven, and 80 W per channel into 4 ohms, which is also the minimum speaker impedance Rotel allows. Total harmonic distortion stays below 0.03% from 20 Hz to 20 kHz, and intermodulation distortion is quoted at the same below 0.03% limit. Frequency response runs from 10 Hz to 100 kHz within plus or minus 1 dB. Rotel lists a 115 dB IHF A-weighted noise figure, a damping factor above 200 and 26 dB of gain. Input sensitivity is 1 V with an input impedance of 20 kohm.

Engineering and use context

The chassis measures 431 x 144 x 424 mm and weighs 15.3 kg net, with a front panel height of 3U, or 132.6 mm, so it fits a standard equipment rack. Power consumption reaches 450 W, while standby draw is 2.6 W. Rotel gives a heat output of 1680 BTU/h measured at 1/8 power, a figure that installers use when planning ventilation for a rack or cabinet. A front panel attenuation control lets the level of the channels be set at the amplifier itself. Input linking allows one source signal to feed several channel pairs, and a buffered link output can feed that signal to another amplifier. A 12 V trigger input lets a controlling receiver or processor power the RMB-1506 up and down together with the system. Speaker cables attach to five-way binding posts, and the mains lead is a detachable IEC type, which makes replacement cords straightforward in a rack installation.

Pairing

The natural partners named by Rotel are its own surround receivers and preamp/processors, whose zone outputs can drive the RMB-1506 so that three extra rooms receive music alongside the main system. The minimum impedance rating should be respected when choosing speakers for each zone, particularly ceiling or wall models wired in long cable runs. Any source or zone output that meets the rated input sensitivity will bring the amplifier to full rated output.

Alternatives

The Rotel RMB-1555 is a five-channel Class AB alternative rated at 120 W per channel into 8 ohms with all channels driven.