Crescendo Systems BM-5.1 Brochure

BM5.1 Bass Management Module

Description

The Crescendo-Systems BM5.1 Bass management module is primarily intended for use
together with DVD-Audio and SACD players, but can be installed in any audio system
where there is no programmable crossover network between the sub-woofer and the
satellites. The crossover frequency can be set separately for the front left, right and center
speakers and the surround left and right speakers, important when these sets of speakers
don't have the same low-end extension. In addition to several different crossover
frequencies there is also a flat setting in case a set of speakers can handle the full
frequency range.

The type of filter used is a phase- and time continuous filter with a 12dB/octave slope for
the sub-woofer output. This means that the sum of the low-pass and high-pass filtered
output is always flat, also at the crossover frequency. The filter type used in the BM5.1 is
the only one with this property; all other filters have phase and amplitude irregularities
around the cross-over frequency. The BM5.1 uses 1% metal film resistors, 5% polyester
film capacitors and high grade audio opamps. Additionally, the sub-woofer output has its
own regulated power supply for minimal interaction with the other channels.

Specifications

Frequency response 20Hz – 20KHz ±0.2dB
Flat position

Distortion Vin=1V

Intermodulation (19KHz & 20KHz) Vin=1V

Corner frequencies flat, 40, 50, 60, 80, 100, 120, 150Hz

Filter slope 12dB/oct lowpass
6dB/oct highpass

Power supply (specify on order) 110V 60Hz, 220V 50Hz

Dimensions (width, height, depth) 155 x 90 x 215 mm
6 1/16’’ x 3 1/2’’ x 8 1/2’’

<-100dBc (0.001%)

rms

<-100dBc (0.001%)

rms

±10%

BM5.1 Distortion of a 1kHz 0dBFS signal