USL CM-8E - Manual (Page 33)

33
DE-15F Amplifier Outputs
The CM-8E has several DE-15F connectors to drive power amplifiers. On screen channels, one
two channel amplifier per screen channel is used. Channel A carries the low band audio, and
channel B carries the high band audio. If the crossover is before the CM-8E (typically in the
processor), the channel A and B amplifier inputs carry the low and high band signals and the
amplifier returns also carry the low and high band signals. If the crossover is in the amplifier,
the amplifier channel A input is driven with full-range audio. The channel B input is not used.
The amplifier returns low band audio to the CM-8E on the channel A return and high band
audio on the channel B return. If the screen channels operate without a crossover (or with a
crossover within the speaker), only the channel A input and return are used. The amplifier is
typically placed in bridging mode so both channels drive one speaker. On the surround
channels, the left surround (side or rear) is on channel A, and the right surround is on channel
B.
DE-15F Signals by Pin
Pin Signal
1 Channel A – input
2 Standbyn – Pulled low to put amplifier in standby
3 Channel A Vmon (output voltage monitor)
4 Channel A Imon (output current monitor – not used on CM-8E)
5 No Connect
6 Chassis Ground (shield)
7 Channel A +input
8 Channel B +input
9 +15V from amplifier (not used by CM-8E)
10 Signal Ground (reference for Vmon and Imon)
11 Channel B –input
12 No Connect
13 Channel B Vmon (output voltage monitor)
14 Channel B Imon (output current monitor, not used by CM-8E)
15 No Connect
Terminal Block Amplifier Outputs
The CM-8E has two terminal blocks providing outputs to the amplifiers plus a line output of the
selected audio channels. The function of these terminals is shown on the rear panel and in the
tables below. The amplifier output terminals duplicate the functionality of the DE-15F
connectors. These terminals are normally used only if the amplifiers do not have DE-15 input
connectors.