Velodyne SMS-1 - Manual (Page 31)

www.velodyne.com Digital Drive SMS-1 User’s Manual - 25
TIP: To see immediate feedback on the effects of your changes to the “SYSTEM RESPONSE” graph, press the
TeST button. The following screen appears:
Press TeST again to return to the SySTem SeTTInGS screen.
NOTE: Some receivers/processors supply a signal that is already crossed over – i.e. just the bass frequencies. If
this is the case, you will want to defeat the SmS-1’s low pass crossover. To defeat the low pass crossover, press
the SELECT key, then the RESET key. OFF appears in all the low pass crossover and low pass slope fields.
NOTE: your goal in setting the low pass crossover is to make the crossover point (the point at which the
subwoofer meets the main speakers in terms of frequency) as smooth as possible. Another big factor in
smoothing this point in the curve is phase, discussed in step 17, below.
15. now adjust the low pass crossover slope. This setting is shipped at 24 dB/octave – a fairly steep slope
to prevent the subwoofer from playing upper frequencies that might call attention to it during normal
operation. At this stage, set the crossover settings under the column entitled SeTUP. Reduce the slope
if necessary and use the TeST button to return to the eQ setup screen and observe the “SySTem
RESPONSE” graph – it should be as flat as possible at the crossover frequency and immediately to
the left and right of it. Too gradual a slope (e.g. 6 dB/octave) may produce a bump at the crossover
frequency, and too steep a slope may produce a dip.