Bridging NAD 7600 Receiver with 2600 Amp
inspiredsports
Posts: 5,502
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?
VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
Conrad Johnson PV-5 w/mods
TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
Tuners w/mods Kenwood KT5020 / Fisher KM60
MF x-DAC V8, HAInfo NG27
Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
NAD SS rigs w/mods
GIK panels
Conrad Johnson PV-5 w/mods
TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
Tuners w/mods Kenwood KT5020 / Fisher KM60
MF x-DAC V8, HAInfo NG27
Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
NAD SS rigs w/mods
GIK panels
Post edited by inspiredsports on
Comments
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Bridging amps without the A1 is very very bad. Bad things will happen. Also I am not sure if the A1 will work with those speakers.
BenPlease. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben -
Thanks Ben. Hopefully someone may know if the A1 works with the SRS 2's.
I haven't even picked them up yet so I'm not certain if they are 1986 blade/blade or 1987-88 pin/blade IC units. I do know the IC outlets are not within the round speaker connection hubs, but separately installed through the back of the cabinet.VTL ST50 w/mods / RCA6L6GC / TlfnknECC801S
Conrad Johnson PV-5 w/mods
TT Conrad Johnson Sonographe SG3 Oak / Sumiko LMT / Grado Woodbody Platinum / Sumiko PIB2 / The Clamp
Musical Fidelity A1 CDPro/ Bada DD-22 Tube CDP / Conrad Johnson SD-22 CDP
Tuners w/mods Kenwood KT5020 / Fisher KM60
MF x-DAC V8, HAInfo NG27
Herbies Ti-9 / Vibrapods / MIT Shotgun AC1 IEC's / MIT Shotgun 2 IC's / MIT Shotgun 2 Speaker Cables
PS Audio Cryo / PowerPort Premium Outlets / Exact Power EP15A Conditioner
Walnut SDA 2B TL /Oak SDA SRS II TL (Sonicaps/Mills/Cardas/Custom SDA ICs / Dynamat Extreme / Larry's Rings/ FSB-2 Spikes
NAD SS rigs w/mods
GIK panels -
You may be able to bi amp them with that combo. I have zero experience with Nad. Hopefully some will chime in.
BenPlease. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
Thanks
Ben
