Velodyne DIGITAL DRIVE SMS-1 Betriebsanleitung PDF herunterladen (Seite 29)

29THE OUTLAW’S GUIDE TO THE SMS-1

each had its phase adjusted as optimally as possible. On the other

hand, the overall system response is the underlying goal, and a single

SMS-1 can achieve that with multiple subs sharing a common signal.

Some systems are set up with stereo subwoofers, meaning that each

subwoofer gets a separate signal (typically one paired to the left

channel and one paired to the right channel). In those cases, two

SMS-1's will be the preferred approach because the SMS-1 is designed

for a mono subwoofer output. Using a single SMS-1 would require

you to sacrice the stereo signals, but having two SMS-1's would allow

you retain the discrete stereo signals to your subwoofers while also

adjusting phase and equalizing each sub separately. There would

be some setup issues to work through when setting up a stereo

subwoofer system of this type. Both units' EQ outputs would need

to be connected to your receiver or processor (a simple Radio Shack

switchbox may aid in this, allowing you to leave both connected with-

out tying up two video inputs). During calibration, you would want

to have the unused SMS-1 turned o at the front panel power switch

so that you aren't adjusting both units. Once you are done, though,

you can connect the two SMS-1's RS-232 ports so that commands sent

to the rst SMS-1 (such as volume, preset, night mode, light, or mute)

would be passed to the second SMS-1 automatically. Alternately, you

could consider slaving the second SMS-1 to the rst with a serial cable

and equalizing the entire system as a whole. In that case, you would

connect the rst unit's EQ outputs to your receiver or processor while

each sub's signal passed through a dierent SMS-1. The same system

settings and EQ curve would be applied to both discrete subwoofer

signals, but those settings would yield an at frequency response

from the system as a whole.



Receiver Bass Management Suggestions and Warnings

We spent a lot of time talking about how to set up (or not set up, as

the case may be) the bass management crossovers in the SMS-1. Most

users will be using the SMS-1 downstream of a surround receiver or

processor and may nd themselves looking at the bass management

settings in that unit while setting up the SMS-1. Some receivers or

processors include pretty robust bass management options, which

while useful can also be confusing. One subwoofer option that is

common applies in cases where the mains are set to “large.” That

option is the “Sub+L/R” subwoofer mode. With the mains set to

large, there should be no bass transferred to the subwoofer and the

mains will attempt to reproduce data all the way down to 20Hz (or

below). With “Sub+L/R” the mains still get a full-range signal, but the

subwoofer gets a copy of some of the low frequency material from

the mains. When setting up an SMS-1, we do not recommend having

the mains set to large – doing so will steer all of the test tones to the

mains, which the SMS-1 equalizers have no inuence over. Setting

mains to “Large” and the sub to “Sub+L/R” will mitigate this only

slightly, as the subwoofer will get some data but the mains will still

operate down into the range normally handled by the subwoofer and

interfere with the equalization process. At least for the purposes of

conguring the SMS-1, we recommend setting your mains to “Small”

(which will require the subwoofer to be turned on). This will let you

see only the frequency response curve of the subwoofer, which is the

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