2. amps-preamps
  3. 159074-115924

Same watts at 8 and 4 ohms?

I'm in the market for an integrated amp and trying to sort through tech specs. My understanding of the tech aspects of hi-fi gear is limited. Looking for some clarity in regard to watts-per-channel specs.

It is my understanding that wpc at 4 ohms is typically 1.5x -2x the wpc at 8 ohms.

But I'm seeing a number of respectable mid-fi integrateds with the same wpc for both 8 and 4 ohms. The NAD 388 is one and I think this is true for several of the Cambridge Audio units at a similar price point ($1500-$2000).

The NAD features make a point of saying " 4-ohm stable for use with a wide range of speakers". 

Would appreciate any insight to what these specs mean and what 4 ohm stable really means to me. My speakers are 4 ohm speakers.

Thanks,

George
n80
n80 OP
2,116 posts
 
Well, the Bryston sold. So at this moment I’m listening to the 6Ts in a bizarre little system.  Sonos Connect into Classe’ AV preamp into old Onkyo home theatre amp. Amp and pre on bypass. It is 75w into 8 and god-knows-what into 4.

It is certainly a reflection of my lack of audio sophistication but it doesn’t sound bad to me. Bass remains quite good. The main difference I notice is that the midrange seems thinner and less lush.

So far just listening at modest volume and the amp isn’t ‘hot’.

This will have to suffice until I get off the fence or win the lottery.
invalid
1,190 posts
 
I doubt any amp can really double it's power with halved impedance. Most of the amps that say they do are actually underrated at the 8ohm impedance.
georgehifi's avatar
georgehifi
10,312 posts
 
I doubt any amp can really double it’s power with halved impedance.
If you take literary then no, it would like perpetual motion then "impossible"

"Almost" double, it’s wattage is the operative word, 8 to 4ohms, 4 to 2ohms and in the ML2’s case 2 to 1ohm

Cheers George
invalid
1,190 posts
 
I would still think the ML2 would be more than 25 watts into 8ohms. My vintage krell amp is 300 watts and is supposed to double, but it measured higher than 300 into 8ohm, so the manufacturer did underrate the amp to get to that doubling into 2ohm and under.
georgehifi's avatar
georgehifi
10,312 posts
 
I would still think the ML2 would be more than 25 watts into 8ohms
They are, when keeping respectable 8ohm distortion figures, losses, as they only have 20v or 25v rails for memory.

Cheers George
More to discover