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Question about NAD 7400 vs new integrated amp

Hello,

I’m currently using the power amp in an NAD 7400 to drive my Polk SDA 2B speakers. The Polks are reasonably efficient (89.7 I believe) with 6 ohm nominal impedance, but are also known to really want plenty of current to sound their best. I have been wondering if I should continue using the 7400 to drive them, or perhaps look at something else. I’ve had my eye on a Musical Fidelity m5si integrated, and comparing the specs on the two is a little difficult for me since they are expressed differently.

The m5si is rated at 150 WPC at 8 ohm, 275WPC at 4 ohm, and is said (by the manufacturer) to be a high current amp. The NAD is spec’d at 100 WPC continuous at 8 ohm, with short term dynamic power of 370 WPC at 8 ohm and 440 WPC at 4 ohm.

Can anyone weigh in on whether or not you feel that the NAD 7400 is plenty to get the most out of these Polks, or would moving to something different like the m5si give better results?

 

Thank you,
Greg

rhythm5
rick_n's avatar
rick_n
208 posts
 

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?

zlone
657 posts
 

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. 

rhythm5 OP
11 posts
 

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

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