Leema-acoustics Monoblock Power Amp Handbook - page 8
What is LIPS?
LIPS or Leema Intelligent Protocol System, facilitates communication between various items in a Leema
audio system. It allows units such as the Elements Integrated and Tucana II, to control other items in a chain.
Leema’s 5.2 surround system is a good example, where an Elements Integrated controls multiple Elements
Power amplifiers and Essentials Volume modules for subwoofer level control. Key information including
volume level, input selection and power control is passed through the bus enabling other units to operate in
synchronisation. Intelligence is added within each receiving unit, for example, a power amplifier handling the
surround channels of a surround system ‘knows’ that it won’t be required when listening to a stereo source
such as CD. Therefore, when the Elements power amplifier ‘sees’ the CD input, it powers itself down.
Each Leema unit can be controlled via the LIPS bus. Controlling units externally for example, enables them
to be used within a home automation system.
LIPS Specifics
The LIPS bus is driven by an open-drain output. Leema can supply a full RS232 interface if required. The
communication standard follows the common RS232 format of No Parity, 8 data bits and 1 stop bit. The baud
rate is 38400.
LIPS Packets
Each communication on the LIPS bus contains a packet of four data bytes as follows:
First a header is sent with a value of 255. This alerts the receivers to incoming data.
Next, a command header is sent. For a volume command, this would be 40.
Next, a value relating to the command is sent. For volume this would be 0 to 248.
Finally a tail byte is sent with a value of 0.
LIPS codes
For further information, please contact Leema Technical Support.
Audio Specifications
Power Output Stereo Mode:
8 Ohms: 55 Watts RMS per channel, 4 Ohms: 92 Watts RMS per channel, 2 Ohms: 160 Watts RMS per channel
Minimum load impedance: 2 ohms
Power Output Monoblock Mode:
8 Ohms: 210 Watts, 4 Ohms: 365 Watts RMS
Minimum load impedance: 4 ohms
Output Current: greater than +/- 12 Amps
Frequency response +0/-3dB @ 1W: 5Hz - 80KHz
Noise (A weighted, volume control minimum): -105dBm
Signal to Noise ratio (A weighted, ref: 150 Watts RMS 4 ohms): -110dB
THD (10 Watts RMS 8 ohms, 1KHz): 0.015% (Measured AES 17)
Maximum DC offset: +/- 50mV
Specifications subject to change without notice.
WEEE Scheme
Disposal of Electronic Equipment in the European Union and other countries with collection procedures:
The wheelie bin symbol on this product indicates that it shall not be treated as household waste. It should be disposed of
via a collection point for the recycling of electrical and electronic equipment.
Leema is fully registered under WEEE/HK 0757 ZX
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