Cliff
Stunt Coordinator
- Joined
- Aug 4, 1998
- Messages
- 55
Recently there have been some threads in which people complained that the outputs from their Samson/SVS units are not loud enough. I have noticed these from owners of both Onkyo and Yamaha receivers, and the responses have included advice that there is a voltage or impedance mismatch between sub-out from the receiver and the amp.
In the past I have learned the rule of thumb that the input impedance of a component should be at least 10 times the output impedance of the signal source. I have a Yamaha RX-V1 with a sub-out impedance of 1.2 KOhms. That means the input impedance of a connected amp should be at least 12 KOhms.
My question is: what is is the input impedance of a Samson amp? I have the S1000 (and 2 SVS CS-Ultras) and cannot find this spec in the online or hard copy documentation for the amp.
I might add that I have a Symetrix 551E connected between my RX-V1 and the S1000. The 551E has an input impedance (for unbalanced connections) of 10 KOhms, which is almost 10x the output impedance of the RX-V1. Furthermore, the output impedance (unbalanced) of the 551E is 150 ohms, which means that, for my system, the S1000 should have an input impedance of at least 1.5 KOhms.
One more thing - I have no complaints about the volume output of my SVSs. I have calibrated with both Avia and VE and have plenty of headroom to spare. So, perhaps my 551E has saved me from the problems that others have reported. Using the rule of thumb I cited, I would need an input impedance in the Samson of 12 KOhms without the 551E, and 1.5 KOhms with the 551E. If the Samson has an input impedance less than 12 KOhms but greater than (or equal to) 1.5 KOhms, then this might explain why it works for me but not for others who have the Samson connected directly to the sub-outs of their receivers.
Does anyone know the spec for the input impedance (unbalanced) of the Samson S1000 or S700?
Thanks,
Cliff
In the past I have learned the rule of thumb that the input impedance of a component should be at least 10 times the output impedance of the signal source. I have a Yamaha RX-V1 with a sub-out impedance of 1.2 KOhms. That means the input impedance of a connected amp should be at least 12 KOhms.
My question is: what is is the input impedance of a Samson amp? I have the S1000 (and 2 SVS CS-Ultras) and cannot find this spec in the online or hard copy documentation for the amp.
I might add that I have a Symetrix 551E connected between my RX-V1 and the S1000. The 551E has an input impedance (for unbalanced connections) of 10 KOhms, which is almost 10x the output impedance of the RX-V1. Furthermore, the output impedance (unbalanced) of the 551E is 150 ohms, which means that, for my system, the S1000 should have an input impedance of at least 1.5 KOhms.
One more thing - I have no complaints about the volume output of my SVSs. I have calibrated with both Avia and VE and have plenty of headroom to spare. So, perhaps my 551E has saved me from the problems that others have reported. Using the rule of thumb I cited, I would need an input impedance in the Samson of 12 KOhms without the 551E, and 1.5 KOhms with the 551E. If the Samson has an input impedance less than 12 KOhms but greater than (or equal to) 1.5 KOhms, then this might explain why it works for me but not for others who have the Samson connected directly to the sub-outs of their receivers.
Does anyone know the spec for the input impedance (unbalanced) of the Samson S1000 or S700?
Thanks,
Cliff