inspiredsports
11-21-2008, 12:18 AM
I've enjoyed my NAD 7600 for 21 years driving wonderful SDA-2B's, and just purchased larger SDA SRS 2's. I'm sure the 7600 will be enough for the new 2's, but I got to thinking I might enjoy some more power driving the larger speakers. I have a chance to buy a well priced NAD 2600 Amp which is the original mate for the 7600 when bridging these amps to mono.
I have 2 critical questions.
First, the NAD literature says the 4 Ohm SRS 2's will appear to the Amps as 2 Ohm loads. I know the NAD power supply is massive, but I don't want to invite meltdown problems. Does anyone have in the group have experience with this combination?
Second and most important, it appears the bridged NAD's become NON-Common Ground amps when they are in bridge mode. I base this on a comment directly from the manual that states " . . . In the bridged mode the speaker wires must be 'floating' with respect to the circuit ground. Do NOT connect the speaker wires to anything that shares a common ground between stereo channels (such as some speaker switches or adapters for electrostatic headphones), nor to anything which shares a common ground with the amplifiers inputs (such as a switching comparator of distortion analyzer)." Am I interpreting this properly?
I'm guessing the SDA Interconnect Cable might cause a problem?
Somewhere in the past I believe I saw a "black box" in the middle of an IC that might be designed to solve this?
I have 2 critical questions.
First, the NAD literature says the 4 Ohm SRS 2's will appear to the Amps as 2 Ohm loads. I know the NAD power supply is massive, but I don't want to invite meltdown problems. Does anyone have in the group have experience with this combination?
Second and most important, it appears the bridged NAD's become NON-Common Ground amps when they are in bridge mode. I base this on a comment directly from the manual that states " . . . In the bridged mode the speaker wires must be 'floating' with respect to the circuit ground. Do NOT connect the speaker wires to anything that shares a common ground between stereo channels (such as some speaker switches or adapters for electrostatic headphones), nor to anything which shares a common ground with the amplifiers inputs (such as a switching comparator of distortion analyzer)." Am I interpreting this properly?
I'm guessing the SDA Interconnect Cable might cause a problem?
Somewhere in the past I believe I saw a "black box" in the middle of an IC that might be designed to solve this?