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Mark Levinson Replica Amp

Dialectic

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#61

Dialectic

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#62
Bueno!

How do you like it?
It's really quiet, and I love SAM. I'm not crazy about the finish.

On balance, I don't think there's a better way to drive passive speakers in stereo than with a Devialet amp.
 

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Dialectic

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#64

Krunok

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#65
It's probably a fine piece of gear.
Yes, it probably is. I always like to see when power doubles when going from 8 ohms to 4 ohms. It is a sign of a generous power supply, and that usually implies the rest may be well designed as well.
 
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Thank you very kindly!
I'll try to have a listen. Sure, this Denon looks very nice indeed.
Any alternatives I should also consider, please?
 

watchnerd

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#67
It's really quiet, and I love SAM. I'm not crazy about the finish.

On balance, I don't think there's a better way to drive passive speakers in stereo than with a Devialet amp.
Ditto on the finish. My cat loves to lie on top of it because it's warm so the top is nothing but a series of paw prints. I've given up trying to keep it smudge-less.

There is a SAM profile for my speakers (3 actually), and I have it enabled, but turned down to 0% (speakers were new). It might be time to turn it back on.

My big wish: a web interface for config changes.

But overall, yes, great way to drive 2 channel passives.
 

Dialectic

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Ditto on the finish. My cat loves to lie on top of it because it's warm so the top is nothing but a series of paw prints. I've given up trying to keep it smudge-less.

There is a SAM profile for my speakers (3 actually), and I have it enabled, but turned down to 0% (speakers were new). It might be time to turn it back on.

My big wish: a web interface for config changes.

But overall, yes, great way to drive 2 channel passives.
Yeah, I really do not like the configurator. Relying on their website to change the configuration of my amp means that I have to worry about Devialet going out of business.

And I do have such worries. I frequently walk by their ridiculous all-glass shop in Grand Central station, and I have not once seen a customer inside.
 

watchnerd

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Yeah, I really do not like the configurator. I have to worry about Devialet going out of business. I frequently walk by their ridiculous all-glass shop in Grand Central station, and I have not once seen a customer inside.
TBH, having them go out of business....and having someone else acquire the assets, IP and run the company better....might not be entirely bad.
 

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TBH, having them go out of business....and having someone else acquire the assets, IP and run the company better....might not be entirely bad.
Haha, good point. I love the amplification tech, but their marketing makes me want to throw up.
 

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#71
Thank you very kindly!
I'll try to have a listen. Sure, this Denon looks very nice indeed.
Any alternatives I should also consider, please?
Hmm, I know that some of our fellow members here have criticized the QC and reliability of the NAD amplifiers, but in my experience, they offer good value. I had an NAD C370 for 13 years, and it could power every speaker I threw at it, including some very difficult ribbon loads. A relative of mine took it, and I am told that it is still running nicely after almost 20 years of heavy use.

Service manuals for NAD amps are all over the internet now, and finding replacement parts for any reasonably recent NAD amp is unlikely ever to pose an issue.

My anecdote isn't much of a sample, though, I admit.
 

RayDunzl

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#72
I always like to see when power doubles when going from 8 ohms to 4 ohms.
I'm somewhat suspicious that capability is accomplished by under-rating the 8 ohm output.

I have a 250/350 amp in one room.

They could have rated it 175/350 and it would be one of the magical devices that double-down.

A published example was the Krell FPB 600.

As I remember it was 600/1200/2400 in 8/4/2 ohms, but tested at 945 at 8 ohms, leaving a nice margin for internal losses as the load impedance was reduced.
 

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#73
They could have rated it 175/350 and it would be one of the magical devices that double-down.
Sure they could, and it would still be the same amp. :)
Different manufacturers rate their products in the different way. In the real world those amps aren't anyhow driving 8 or 4 ohms resistors but real world speakers whose impedance varies with frequency, in some cases in quite a wild fashion.
 

Wombat

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#75
Hmm, I know that some of our fellow members here have criticized the QC and reliability of the NAD amplifiers, but in my experience, they offer good value. I had an NAD C370 for 13 years, and it could power every speaker I threw at it, including some very difficult ribbon loads. A relative of mine took it, and I am told that it is still running nicely after almost 20 years of heavy use.

Service manuals for NAD amps are all over the internet now, and finding replacement parts for any reasonably recent NAD amp is unlikely ever to pose an issue.

My anecdote isn't much of a sample, though, I admit.

I agree. My experience with NAD is positive. They are still one of the most popular brands. Nad started in 1972(45 years ago) and are still going strong.
The few internet negatives compared to the numbers sold are inconsequential.
 

Krunok

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#78
Because it would need to be 100% efficient
Sure, but many amps will come very close to double the power when impedance drop from 8 to 4 ohms. As long as their output stage can channel enough current without voltage drop from the power supply I see no reason why they wouldn't. Of course the losses will increase with the power, but they will still come reasonably close to double the power.
 
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TBone

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#79
I agree. My experience with NAD is positive. They are still one of the most popular brands. Nad started in 1972(45 years ago) and are still going strong.
The few internet negatives compared to the numbers sold are inconsequential.
Earliest NAD models had female rca's soldered directly to the mother-board; at the back of the unit. The user would plug the male interconnects directly down into the rca socket. That act itself, plus the constant pull of the interconnect over time, would often weaken the rca connection to the motherboard, causing many connectivity problems.

Past those initial days, IMO, it's been mostly positive.
 

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#80
Sure, but many amps will come very close to double the power when impedance drop from 8 to 4 ohms.
I agree. They should all "double down" within some range of operation. Feedback compares the output voltage to the input, and maintains the gain, so double the current flows into the reduced impedance of the load.

1W into 8 ohms becomes 2W into 4.

5 becomes 10 and so on.

The problem with doubling comes at the limits of the device.

Random example:

https://www.stereophile.com/content/luxman-l-509x-integrated-amplifier-measurements

"With clipping defined as when the THD+noise in the output reaches 1%, I measured clipping powers of 154Wpc into 8 ohms (21.9dBW, fig.5) and 250Wpc into 4 ohms (21dBW, fig.6)."

The manufacturer rated it at 120/2200, almost a double.

They could have underrated it at 110/220, and claimed the double.
 
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