Has anyone tried the ATI AT54XNC Class D amps? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 643 Old 11-06-2016, 06:18 AM - Thread Starter
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Has anyone tried the ATI AT54XNC Class D amps?

Hello,


Due to the heat my amps generate, I was considering trying some Class D Amps. My current amps are 300 @ 8 ohms. I was considering the AT54XNC amps but can't find a single review of them.
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post #2 of 643 Old 11-06-2016, 12:19 PM
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Great amplifiers, the Hypex N-core modules are incredible..

Just my $0.02...
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post #3 of 643 Old 11-06-2016, 12:32 PM
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https://www.avsforum.com/forum/86-ult...hread-549.html

rhale64L7 seems to be the first with one and compared it to Theta Dreadnought , seems to be a great sounding amp! maybe he can shed some light on your query

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post #4 of 643 Old 11-06-2016, 04:22 PM - Thread Starter
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Thanks - you have an impressive knowledge of all posts on AVS! I just read his review. It gives me hope. I've contacted ATI to see if they have any sort of audition program. If I like them I'll probably give up my Anthems I love their sound but like all AB amps they run warm and so do I so I'd appreciate something cooler.
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post #5 of 643 Old 11-06-2016, 06:24 PM
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Quote:
Originally Posted by boe View Post
Hello,


Due to the heat my amps generate, I was considering trying some Class D Amps. My current amps are 300 @ 8 ohms. I was considering the AT54XNC amps but can't find a single review of them.
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Originally Posted by M Code View Post
Great amplifiers, the Hypex N-core modules are incredible..

Just my $0.02...
Assuming M is correct and they are NCore Hypex, they should be extremely good. Bruno Putzey who designed the modules is a very talented engineer.

There is a recent DIY build here which shows how well they measure and provides a bit more info on them; not exactly what you wanted but you might find it interesting, and even worth copying if you're at all handy and would like to save some $. You should check out the author's HT of the Month as well.
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post #6 of 643 Old 11-06-2016, 07:59 PM - Thread Starter
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Thanks. I'll check it out. Yipes - $1K per unit - I have 9 channels I'm wondering what the 200hz spike means.
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Last edited by boe; 11-06-2016 at 08:06 PM.
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post #7 of 643 Old 11-06-2016, 10:05 PM
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Quote:
Originally Posted by boe View Post
Thanks. I'll check it out. Yipes - $1K per unit - I have 9 channels
Well, you could save a notional $2K straight away by abandoning the worthless passive bi-amping of your mains. Contrary to popular mythology, this will make no net electrical difference and hence make no actual difference the sound.

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I'm wondering what the 200hz spike means.
That's the 200Hz Sine wave test signal being fed to the amp.
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post #8 of 643 Old 11-07-2016, 05:04 AM - Thread Starter
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Originally Posted by GIEGAR View Post
Well, you could save a notional $2K straight away by abandoning the worthless passive bi-amping of your mains. Contrary to popular mythology, this will make no net electrical difference and hence make no actual difference the sound.


That's the 200Hz Sine wave test signal being fed to the amp.

Thanks - why the big jump at that point and no other? Is that some point where it can't go beyond?

Last edited by boe; 11-07-2016 at 05:10 AM.
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post #9 of 643 Old 11-07-2016, 06:57 AM
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Quote:
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Thanks - why the big jump at that point and no other? Is that some point where it can't go beyond?
It's an RTA graph of a 200Hz (@ -29.6dBFS) fundamental input to the amp. It produces a few small harmonics (numbered), but these quickly sink to the noise floor of the amp (@ >-140dBFS). I'm no expert, but these look like an exceptionally quiet amp module.

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post #10 of 643 Old 12-13-2016, 05:42 AM
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Any other ATI n-core users out there?

I'm debating wether to go with this or a the Sunfire class H amp.

Both similar price & weight etc - I'm assuming my ears wont be able to tell the differrence between the two.
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post #11 of 643 Old 12-13-2016, 10:27 AM
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Sunfire is a Class G amplifier (Tracking Downconverter - ie continuously variable rail voltage, unlike Class H which has a fixed number of different rail voltages - most Class H's have 2 different rail voltages, but some have 3 different rail voltages) that uses a Class AB output stage (Toshiba Bipolar Output transistors in push-pull configuration).

If you have a few hours, you can go to wikipedia and read and study, in depth, the various power amplifier designs and Classes. It is a very good read.

And no, I am not an electrical engineer. But I did stay at a Holiday Inn last night.
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post #12 of 643 Old 12-13-2016, 11:38 AM
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Uh, Class G switches the rails, Class H uses a continuously variable supply, at least when I took the class and designed the amp...
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post #13 of 643 Old 12-13-2016, 12:16 PM
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That aside - are there any advantages of one over the other when comparing the Sunfire to the ATI?
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post #14 of 643 Old 12-13-2016, 03:24 PM
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I exchanged a couple of emails with Jeff Hipps of ATI maybe 6 months ago concerning the new ATI Class D Hypex Module based amplifiers. He told me to read the Stereophile review of the nearly identical amplifier - Theta Digital Prometheus monoblock power amplifier http://www.stereophile.com/content/t...CDeRmYrJebl.97

I have never been a fan of Ice-Power amps or any other Class D amps. I am a Class AB guy. However, Jeff assured me these new ATI Hypex Module based amps are every bit as good as a traditional Class AB amp that I have always loved, and always owned (including a couple different ATI amps and Outlaw Audio amps). I must say the Stereophile review is a glowing review from a reviewer who, just like me, traditionally has NOT liked Class D amplifiers.
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post #15 of 643 Old 12-13-2016, 03:56 PM
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Quote:
Originally Posted by clydetheglide79124 View Post
I exchanged a couple of emails with Jeff Hipps of ATI maybe 6 months ago concerning the new ATI Class D Hypex Module based amplifiers. He told me to read the Stereophile review of the nearly identical amplifier - Theta Digital Prometheus monoblock power amplifier http://www.stereophile.com/content/t...CDeRmYrJebl.97
Just finished a review of the ATI AT543. Should be in the March issue.
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post #16 of 643 Old 12-13-2016, 04:03 PM
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Kal, thank you very very much!! I have been wanting to read some reviews of the new ATI Hypex Module based amps for awhile now. I have an extremely strong feeling these new ATI Class D amps are going to test very very similarly to the Theta Digital amp Stereophile reviewed in 2015 that I referenced earlier.

Anyways, thank you Kal!! Also, how in God's name have you been able to amass 29,400 posts here on avsforum.com ?? I am guessing you must have been a member here since the Civil War.
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post #17 of 643 Old 12-13-2016, 04:59 PM
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Quote:
Originally Posted by clydetheglide79124 View Post
Kal, thank you very very much!! I have been wanting to read some reviews of the new ATI Hypex Module based amps for awhile now. I have an extremely strong feeling these new ATI Class D amps are going to test very very similarly to the Theta Digital amp Stereophile reviewed in 2015 that I referenced earlier.
It will be in my column, MITR, because multichannel is not generally featured in the stand-alone reviews. I also covered the Theta Dreadnaught D a little while back.

Quote:
Anyways, thank you Kal!! Also, how in God's name have you been able to amass 29,400 posts here on avsforum.com ?? I am guessing you must have been a member here since the Civil War.
Dunno. Guess that makes me old.

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post #18 of 643 Old 12-13-2016, 06:44 PM
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Dunno. Guess that makes me xxx prolific.
Fixed the typo...

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post #19 of 643 Old 12-13-2016, 06:53 PM
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Kal, what is the issue number of your Theta review?
I looked through my online versions and didn't see it.
I admit I'm lazy.

 

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post #20 of 643 Old 12-13-2016, 07:01 PM
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Kal, what is the issue number of your Theta review?
I looked through my online versions and didn't see it.
I admit I'm lazy.
Google says http://www.stereophile.com/content/m...88BeDhU4z6L.97
and http://www.stereophile.com/content/m...ThYDPemw9CK.97

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post #21 of 643 Old 12-13-2016, 10:48 PM
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I'm curious how these compare to the NAD M22/M27. The nCore noise floor just seems so appealing to me. Only other amp I've be considering would be the Benchmark AHB-2, but I'm not sure how I feel about the lack of SE inputs.

Are there any other quality nCore amps in the same price range?
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post #22 of 643 Old 12-14-2016, 06:25 AM
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Quote:
Originally Posted by Kal Rubinson View Post
Just finished a review of the ATI AT543. Should be in the March issue.


Can you give us a one sentence preview?
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post #23 of 643 Old 12-14-2016, 06:27 AM
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Thanks!
I forgot I'd already read it.

 

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post #24 of 643 Old 12-14-2016, 06:55 AM
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Quote:
Originally Posted by madhuski View Post
Can you give us a one sentence preview?
Nope.

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post #25 of 643 Old 12-14-2016, 07:22 AM
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Nope.

Rats- well, order placed!
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post #26 of 643 Old 12-14-2016, 08:54 AM
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madhuski, it is good to hear you placed an order with ATI for one of their new Class D output amplifiers. Which model of ATI amp did you purchase, may I ask? The 200 Watts per channel (8 ohms) or 500 watts per channel (8 ohms) model? Please let us know what you think of the amp when you receive it. Thank you madhuski !!
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post #27 of 643 Old 12-14-2016, 09:12 AM
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I want with the 200w model (AT527NC I think)

Looks like they have to make it, so shipping sometime next week
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post #28 of 643 Old 12-15-2016, 06:51 PM
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Can you give us a one sentence preview?
Obviously, you're not at all familiar with Mr. Rubinson.
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post #29 of 643 Old 12-15-2016, 07:33 PM
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Obviously, you're not at all familiar with Mr. Rubinson.
I don't deny that I enjoy the baiting but the real issue is that I am not permitted to release any comments from a review prior to publication. Ask me something objective.
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post #30 of 643 Old 12-16-2016, 06:34 AM
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I don't deny that I enjoy the baiting but the real issue is that I am not permitted to release any comments from a review prior to publication. Ask me something objective.
I'm aware of both points, Kal.
Objective?
I always assumed we read your column for the subjective content & JA did the objective portion, measurements.
I'll give it a shot.
How did the ATI measure vs the Dreadnaught?

 

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