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Denon AVR-S670H

Hello. Thanks for answering. Please define "dynamic".
In the avr spec sheet something like this: (this is from the Denon A1H flagship specs):

Dynamic power:
170 W x 2-channel (8 Ω/ohms)
280 W x 2-channel (4 Ω/ohms)

Sometimes it'll be indicated at 8, 6, 4 and 2 ohm with a wattage figure for each. It's not full band or at a specified distortion level.
 
In the avr spec sheet something like this: (this is from the Denon A1H flagship specs):

Dynamic power:
170 W x 2-channel (8 Ω/ohms)
280 W x 2-channel (4 Ω/ohms)

Sometimes it'll be indicated at 8, 6, 4 and 2 ohm with a wattage figure for each. It's not full band or at a specified distortion level.

I got the information off of crutchfield. I looked in the manual that I downloaded from crutchfield. It didn't state anything about 4 ohm stable. It did give the ratings for six ohms. But when I was choosing the receiver that I was looking for I chose one with five channels and that was forum stable.

So, "4 ohm stable", means that it might go down to four ohms at "whatever" frequency and No guaranteed percentage of distortion?

Marketing?

Just don't understand why crutchfield would make the claim but Denon would leave that out of their paperwork
 
Just don't understand why crutchfield would make the claim but Denon would leave that out of their paperwork
It's the other way around. Crutchfield miss-copied the data from Denon into their product summary tool. Denon don't specify it at 4 Ohm
 
Interesting. Now that I really look, Denon doesn't seem to provide any real specifications below 6 ohm, even on up-market models like the X4800H.

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However, we know from the ASR review that it certainly can handle 4 ohms:

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Some AVRs do list 4 ohm specs, though, for example JBL MA7100HP:

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This is screenshot of the specs. On the bottom it reads 4-16 ohms
It could also say 1 to 2000 Ohms. That line doesn't say anything about power delivery! Assuming any safety protection doesn't kick in, it would probably safely deliver 0.001W into 2 Ohms. Presumably they state 4 Ohms because below that safety protection kicks in.

What's going on here? As you halve resistance, you double current (Ohm's law). Current is what causes the amplifier to heat up. So 8 Ohm speakers at 3V will very roughly make the amplifier twice as hot as 16 Ohm speakers at 3V. As you lower the resistance, to keep the amplifier safe, you need bigger and bigger heatsinks and beefier devices, and stiffer (current handling) power supplies. Possibly fans as well. These are all very expensive. For stereo, it's a challenge, for 5 channels it's a very big deal
 
The Denon European specification sheet for the AVR-S670H does NOT mention 4 Ohm, only 6 Ohm for speaker output. You should probably check the speciation sheet to confirm the seller has correctly recorded the details.
It is rated 75 W 8 ohms, so it should be completely fine to be rated 37.5 W 4ohms.;)

Most , if not all avrs are NOT 4 ohm rated for more than their 8 ohm rated values. If they do, they would most likely use some sort of short time duration, higher distortions, band limited, or any combinations of those caveats. The same applies to many integrated 2ch amps and some power amps.

Edit: added missing word "NOT".

@MaxwellsEq , sorry I had to edit my post after you read it. It was major error/omission because I missed the word "not", no idea how it happened.
 
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It could also say 1 to 2000 Ohms. That line doesn't say anything about power delivery! Assuming any safety protection doesn't kick in, it would probably safely deliver 0.001W into 2 Ohms. Presumably they state 4 Ohms because below that safety protection kicks in.

What's going on here? As you halve resistance, you double current (Ohm's law). Current is what causes the amplifier to heat up. So 8 Ohm speakers at 3V will very roughly make the amplifier twice as hot as 16 Ohm speakers at 3V. As you lower the resistance, to keep the amplifier safe, you need bigger and bigger heatsinks and beefier devices, and stiffer (current handling) power supplies. Possibly fans as well. These are all very expensive. For stereo, it's a challenge, for 5 channels it's a very big deal
AC Infinity AIRCOM S7, Quiet Cooling Fan System 12" Top-Exhaust for Receivers, Amps, DVR, AV Cabinet Components https://a.co/d/cNNZSz1
 
I got the information off of crutchfield. I looked in the manual that I downloaded from crutchfield. It didn't state anything about 4 ohm stable. It did give the ratings for six ohms. But when I was choosing the receiver that I was looking for I chose one with five channels and that was forum stable.

So, "4 ohm stable", means that it might go down to four ohms at "whatever" frequency and No guaranteed percentage of distortion?

Marketing?

Just don't understand why crutchfield would make the claim but Denon would leave that out of their paperwork
It's simply not rated by the manufacturer for 4 ohms other than the dynamic spec. Doesn't mean it can't be used, but it does have limitations. I don't know what Crutchfield's criteria is. I wouldn't rely on any retailer's info particularly, I always look at the manufacturer's (preferably the manual).
 
Does anyone have any suggestions for a good 4 ohm stable receiver that will compliment 5 Wharfedale speakers?
 
What's your criteria for a "4 ohm stable" receiver? The manufacturer having a rating for it at 4 ohms?
 
What's your criteria for a "4 ohm stable" receiver? The manufacturer having a rating for it at 4 ohms?
I fully understand that as long as I don't get overzealous with the volume I can run four room speakers all day long with this receiver.

But since I'm going to be purchasing a new receiver here in the next couple of months, I was sort of kind of in a way entertaining the idea possibly going with something that actually states that it's four ohm stable.

Possibly this one? I'm not very well versed with JBL receivers.

 
Does anyone have any suggestions for a good 4 ohm stable receiver that will compliment 5 Wharfedale speakers?
Which Wharfedale model?
Seating distance?
Not over zealous volume means what volume setting on your avr like Denon? Or what is your desired maximum spl at your seat would be even better info.

With tbe sbove info, it will easy to recpmmend a few avrs that can do the job for you.
 
It looks like your budget is in the ~$600 range? You might want to consider a refurb Onkyo NR-7100. It should meet your requirements and, importantly, comes with Dirac Live included. Having good room correction is one of the best upgrades you can get.

The specs list dynamic power into 3 and 4 ohms, and it specifically lists speaker impdance in the 4-16 ohm range.

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If you don't want to go with a refurb, then the JBL MA510 should work just fine. All the models are rated for continuous power into 4 ohms.
 
Which Wharfedale model?
Seating distance?
Not over zealous volume means what volume setting on your avr like Denon? Or what is your desired maximum spl at your seat would be even better info.

With tbe sbove info, it will easy to recpmmend a few avrs that can do the job for you.

Which Wharfedale model? Discontinued D300.

Seating distance? 15ft

Not over zealous volume means what volume setting on your avr like Denon? Maybe halfway up. I don't start hearing anything until about 30 (volume) on the display.
 
I fully understand that as long as I don't get overzealous with the volume I can run four room speakers all day long with this receiver.

But since I'm going to be purchasing a new receiver here in the next couple of months, I was sort of kind of in a way entertaining the idea possibly going with something that actually states that it's four ohm stable.

Possibly this one? I'm not very well versed with JBL receivers.

Well, it is rated for 4 ohm, but only 100 wpc (and no pre-outs should you want more). Limited connectivity. Hard to know a lot about JBL avrs, they're relatively new. There is one test so far here https://www.audiosciencereview.com/forum/index.php?threads/jbl-ma7100hp-av-receiver-review.57176/
 
Which Wharfedale model? Discontinued D300.

Seating distance? 15ft

Not over zealous volume means what volume setting on your avr like Denon? Maybe halfway up. I don't start hearing anything until about 30 (volume) on the display.
What does "half way up" on volume mean, especially if the volume scale is in dB?
 
Which Wharfedale model? Discontinued D300.

Seating distance? 15ft

Not over zealous volume means what volume setting on your avr like Denon? Maybe halfway up. I don't start hearing anything until about 30 (volume) on the display.
If you mean the D300 surround and center, those speakers can't play anywhere near reference level from 10 ft, let alone 15 ft. The recommended peak power for the D330 towers is only 120 W.

If you want to get the best put of them, I would recommed the AVR-X3800H, or Marantz Cinema 50.

If you won't ever go over volume -20 (relative scale), that is 60 in the absolute scale, then the avr-x1800h can do it too.

So can that JBL, but the x3800h is way better in almost every way.

Again, avrs are not rated for 4 ohm based on traditional ways, but in your use case with the D300 series, the avrs mentioned are fine.
 
If you mean the D300 surround and center, those speakers can't play anywhere near reference level from 10 ft, let alone 15 ft. The recommended peak power for the D330 towers is only 120 W.

If you want to get the best put of them, I would recommed the AVR-X3800H, or Marantz Cinema 50.

If you won't ever go over volume -20 (relative scale), that is 60 in the absolute scale, then the avr-x1800h can do it too.

So can that JBL, but the x3800h is way better in almost every way.

Again, avrs are not rated for 4 ohm based on traditional ways, but in your use case with the D300 series, the avrs mentioned are fine.
I have is five channels. The ones you suggested are nine channel.

In my small space all I need is five channel.

I will be willing to go as high as a seven channel (and not use the two extra channels) If that meant getting a superior receiver for a fair price. I just don't want to pay $1,600 for 9 channels when I'm only using five
 
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