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
I appreciate you guys helping out. This stuff is mind numbing if you’re not into it.

My primary system is an older one that was given to me. It was researched to the nth degree by the original owner. The point being that I’ve never had to do this sort of legwork and to be honest it isn’t one of the things about being an audiophile that appeals to me.

But, this person passed away and left me the speakers that I’m researching now. They are Aerial Acoustics 6Ts. Specs are below.

These will be part of my secondary system which will get used much less than my primary. It is not in a room that is ideal for listening so ultimate SQ is not the goal here and my budget is limited....you might even say stretched to no more than $2000.

I’ve got several threads going about this and I’m no closer to narrowing my search. Professional reviews can be all over the place and other Audiogon members can have completely different experiences than pro reviewers. One person says product 'A' is awesome and someone else says its horrible. As mentioned, the stats don’t always tell you what you need. And it almost seems like the speakers were designed to require high dollar components.

Here are the specs:

Frequency Response 35 Hz to 25 kHz ±2 dB, -6 dB at 30 Hz
Sensitivity 90 dB for 2.83 volts at 1 meter on axis
Impedance 4 ohms, 3 ohms minimum, low reactance
Power Requirements 25 watts minimum, >50 recommended
@atmasphere 
Thanks, Ralph. Both amps listed will voltage drive the OP's speakers, but when said amps don't list separate power specs for 4ohm and 8ohm, it's doubtful that they double down their power rating. Yes?


it's doubtful that they double down their power rating. Yes?
Yes, but as I pointed out, that is only a 3dB issue. Another way of looking at this is that if the rated power is enough to do the job, its no worries. It really is that simple.
Its only mind-numbing if you make it that way. Most of the guys here are experts at spinning you so far down the rabbit holes you'll wish you'd taken up something fun and easy like nuclear physics or MMA. 

Your speakers are at the low end of acceptable, but then so were mine until recently. Here's what I had, and they were the same 90dB only mine were nominal 8 ohm. https://systems.audiogon.com/systems/8367 Notice that is a 50wpc tube amp. Notice that is a pretty big room. I listen fairly loud, sometimes really loud, and was just able to do that with these speakers and amp. Now with Tekton Moab speakers, 98dB, in spite of being 4 ohms they are a lot easier to drive and play really loud with a fraction of the power the Talons required. Because, remember, log function. 

So again, forget power. Forget who likes what. Least useful thing imaginable is some reviewer telling you they liked it. Only way that has any meaning at all is if you know the reviewer, he's your best bud, you heard all kinds of stuff together and agree on everything. Otherwise, ignore. Only thing matters is what they say they heard. Pay attention to how they describe the sound. How they say it compares to other amps. Pay attention to what they regard as a higher standard. Because its all relative. There's a million levels. You can find great gear at every level. But the more time you spend thinking about watts and ohms the harder it gets to find them.


@millercarbon, I get what you're saying but I have to narrow down the field somehow. And with a budget of under $2000 and no dealers conveniently close, auditioning is nearly impossible outside of shipping stuff back and forth which is time consuming and possibly expensive.


I can tell you that they sound great with a Classe' Sigma SST pre into a Bryston 9B (both are AV units). But those are not mine to keep and they are too bulky and 'ugly' for the room.