Question about NAD 7400 vs new integrated amp

I'm a little  confused about your system setup.  You wrote, "I’m currently using the power amp in an NAD 7400 to drive my Polk SDA 2B speakers."  Does this imply that you are using an outboard Preamp and are only using the power section of the NAD?

I like NAD, and used to have a 375BEE, but I think you could do better, and based on the vintage of the 7400, something newer would likely offer immediate improvements. The M5 would likely sound good, though when I think of high current,I expect to see doubling of wattage into 4 ohms, 2 ohm stable as a bonus if you have really hungry speakers. 

rick_n,

Yes I am only using the power section of the NAD.  I currently have my sources connected to an AVR, and the main front L/R pre-amp outputs of the AVR going to the NAD's power amp in jacks.  So these days the whole preamp section of the NAD 7400 is not in use.

My plan is to get a dedicated stereo preamp or integrated amp with an HT bypass input for my 2 channel music listening, and only use the AVR for multi-channel listening (movies).  Whether I buy a new preamp or integrated amp depends on whether or not I'll continue driving the Polks with the 7400's power amp.

Greg

zlone,

I have been looking for a doubling of wattage also, but thought that perhaps the 150/270 spec on the M5si might be enough.  The specs on this amp also mention "512W peaks into 2 ohms", although I'm not exactly sure what that means regarding stability.

A complete doubling of power from 8 ohm to 4 ohm is a bit harder to find in integrated amps, as opposed to a separate power amp, but I was hoping to find an integrated that would do the job (hopefully at max $2500) just due to limited shelf space (and budget).

If I run across an integrated amp that is rated at 100/200, would that be a better bet than the 150/275 of the M5si?  Or perhaps that all depends on the design of the particular amp.

Greg

The m5si has almost twice as much current by quoted specs.

Only your hearing will determine how much better SQ if any.

My $.02…get an integrated with HT bypass and a voltage trigger to activate it.  The preamp in the integrated will outperform the one in the AVR when used with stereo-only sources, and that will matter more than you imagine.  Look at Parasound Halo.

HINT 6

I think the M5 would be fine. I was just questioning the high current status, though like you said it is very close. If you had really difficult speakers to drive it might make a difference, but I think you are on the right track.