Specifications

Next come three LFE Output RCA sockets that can be used to connect up to three

subwoofers. Each produces an identical signal. Composite and S-Video TV outputs are

provided, one of which should be connected to a TV or other display device for visualizing

the EQ curves and accessing the menu structure. There is a 9-pin RS232 input socket to

allow serial control by Crestron/AMX-type universal remote controls as well as the ability

to upload software upgrades using a PC. The 9-pin RS232 output socket allows a second

daisy-chained SMS-1 to be controlled as a slave by the first (master) unit. An external IR

remote sensor may optionally be connected via a 3.5mm jack.

Finally, there are three XLR jacks, allowing an alternate place to connect the microphone,

another LFE input, and an LFE output.

Internally, all the inputs are summed to create a single channel (mono) signal. This is

converted to digital using a 20-bit A/D converter. The heart of the device is a Texas

Instruments TMS320LF2407 DSP chip running proprietary Velodyne software, hand-coded

in assembler language for speed. This takes the digital signal, performs all the sweep-

generation, digital filtering, phase control and video-display functions, generating a

modified mono digital signal which is converted back to analog and fed to the three RCA

and one XLR LFE outputs from the device.

Software is stored in flash memory and can be updated via the RS232 input socket using

a PC and mouse extension cable. Software upgrades can be downloaded from the

Velodyne website and arrive in a self-extracting *.zip file. All parameters are retained in

non-volatile memory.

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