Regarding the SMS-1, the one concern I would have about connecting it to the DS450 outputs relates to the fact that the DS450 is a differentially balanced amp. So presumably its negative output terminals as well as its positive output terminals have full amplitude signals on them. The concern would be that depending on the internal grounding configuration of the SMS-1 and the design of the external 12VDC power supply it apparently uses, that a low impedance path might be created from the amp’s negative output terminals to the circuit ground of the SMS-1, then through some unknown but possibly low impedance to the AC safety ground of the SMS-1’s power supply, then via the AC wiring to the amp’s AC safety ground, then probably through a low value resistor within the amp to it’s circuit ground. In effect possibly putting a near short circuit on the amp’s negative output terminals, and applying a much higher voltage across that resistor than it was designed to handle.
If the SMS-1’s power supply had a two-prong AC plug (i.e., a plug that doesn’t have a safety ground connection) I would be confident that wouldn’t be an issue, but photos I found online appear to indicate that it has a three-prong power plug, which leaves me uncertain.
So if you decide to go that way it I’d suggest asking Velodyne what the impedance is between the SMS-1’s negative speaker-level input terminals and the AC safety ground pin of its power supply. If it is high, or if those points are electrically isolated from each other, there won’t be a problem.
Regards,
-- Al
If the SMS-1’s power supply had a two-prong AC plug (i.e., a plug that doesn’t have a safety ground connection) I would be confident that wouldn’t be an issue, but photos I found online appear to indicate that it has a three-prong power plug, which leaves me uncertain.
So if you decide to go that way it I’d suggest asking Velodyne what the impedance is between the SMS-1’s negative speaker-level input terminals and the AC safety ground pin of its power supply. If it is high, or if those points are electrically isolated from each other, there won’t be a problem.
Regards,
-- Al