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Audiophonics HPA-S400ET Review (Stereo Amplifier)

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  • 1. Poor (headless panther)

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  • 2. Not terrible (postman panther)

    Votes: 3 0.7%
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    Votes: 401 91.8%

  • Total voters
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Acerun

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Can someone tell me what the maximum output voltage is for this unit? I have a Denon x3700H and I believe Amir recommends external amplifiers that output under 1.4 volts.
Looks like 2.2v on standard... Does that make it not suitable for the X3700H? I'm unclear at what point degradation happens. If you don't listen too loud do you get the purify sound quality and don't have to worry about max power degradation? I suppose the weakest link is the X3700H DAC.
 
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Sokel

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My friend is expecting the Sparcos Edition one to be used with 98db horns.
Any excising noise or strange issue will be reported immediately,as well as aesthetics (I'm super superficial) and perceived built quality.
(meaningless to say that will be used with fractions of a watt to 4-5 watts but still...)
 

Sokel

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My friend is expecting the Sparcos Edition one to be used with 98db horns.
Any excising noise or strange issue will be reported immediately,as well as aesthetics (I'm super superficial) and perceived built quality.
(meaningless to say that will be used with fractions of a watt to 4-5 watts but still...)
Nope,no noise,no nothing,someone had to put his head in the horn to hear a slight hiss.
Good built quality,good sound,only thing is a low level humming if you go really close.

Strange thing is that driven by the Audio Research L28 (if I remember the model correctly) with the HPA-S400 in normal setting (not bypass) and balanced connection the pot needed to go a little higher than I thought it would be (around 10 'o clock of rotary) for fun (thunderous) listening in the 3.5 meters triangle.

It didn't complain a bit with the forte's of complex orchestral plays and had a nice quiet background on pauses and at plays with a single piano.
Nice amp.
 
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Overseas

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Nope,no noise,no nothing,someone had to put his head in the horn to hear a slight hiss.
Good built quality,good sound,only thing is a low level humming if you go really close.

Strange thing is that driven by the Audio Research L28 (if I remember the model correctly) with the HPA-S400 in normal setting (not bypass) and balanced connection the pot needed to go a little higher than I thought it would be (around 10 'o clock of rotary) for fun (thunderous) listening in the 3.5 meters triangle.

It didn't complain a bit with the forte's of complex orchestral plays and had a nice quiet background on pauses and at plays with a single piano.
Nice amp.
The Audiphonics was compared to what other amp ?
 

Sokel

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The Audiphonics was compared to what other amp ?
The usual set up there is AR monoblocks but there is also a pair of small tubes amp,a big AB [email protected] ohms,etc.
Not really compare them though,that would take a lot of work.
He got this out of curiosity and it turned to be really nice.
 

Redwine

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Anyone who knows the idle spec for a Purify designed amplifier?

Think I read approx 17watt somewhere, but sounds high to me.
 

tmtomh

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Anyone who knows the idle spec for a Purify designed amplifier?

Think I read approx 17watt somewhere, but sounds high to me.


Official Idle loss spec is 1.7W, but I presume that's just for the module or the reference design.
 

djwkyoto

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Anyone who knows the idle spec for a Purify designed amplifier?

Think I read approx 17watt somewhere, but sounds high to me.
I recently measured the power consumption of my gear using a simple energy meter that plugs between the wall outlet and your devices.
The Audiophonics HPA-S400ET drew 0.133 A when idle, which translates to about 30 W with 230 V.
If it draws the same current with 120 V this would be your 16-17 W.

Interestingly the amp didn't draw more current when I played music. The only thing that changed the Ampère values was the CD-Player (spinning or not). Even when I turned it up a little and played some bass heavy music the values stayed the same.

Is that normal for a class D amp? I've always suspected it would consume less when idle than when working. But maybe my listening volume just wasn't enough to make the amp really "work" and drar more current (I'm living in a flat and keeping the levels very reasonable).
 

ivo.f.doma

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I would like to know your opinion on two possible solutions for LCR amplification. The first solution: three multiblocks with individual smaller PS, but 2x65V
The second solution: one triple amplifier with one large PS 2x64V.
Any thoughts on the pros/cons? Don't overlook the price!
 

anphex

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I would like to know your opinion on two possible solutions for LCR amplification. The first solution: three multiblocks with individual smaller PS, but 2x65V
The second solution: one triple amplifier with one large PS 2x64V.
Any thoughts on the pros/cons? Don't overlook the price!
I don't see an issue here as long as the SMPS matches or surpasses the added rating power of all amp modules. So it looks fine to me.
 

JohnnyNG

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I don't see an issue here as long as the SMPS matches or surpasses the added rating power of all amp modules. So it looks fine to me.
May I ask what determines the ability of a PS to allow the 1ET400A to generate its rated power? Is it the 65V?
 

anphex

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@JohnnyNG

This is mostly a non-technical guess considering my experiences so far but:

Yes, I think it's the voltage. It can be kind of interpreted as a sensivity to reach max power.
My hunch is that when the voltage rail of the power supply doesn't match this value you have to expected a lower peak performance. Also, maybe some kind of distortion depending on how strained the SMPS will become by trying to reach this 65v.

As I said, just guesses. I remembered the Hypex NC400 DIY review where one undersized SMPS was used for two modules and you could see power limiting an earlier than spec distortions.

 

ivo.f.doma

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And which option, a three-channel one amplifier, or three single-channel ones (with a higher supply voltage) is better?
I cannot assess the quality, the heating of the filter capacitors and the cooling possibilities of individual PS sources in three-channel and single-channel amplifiers.
 

JohnnyNG

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@JohnnyNG

This is mostly a non-technical guess considering my experiences so far but:

Yes, I think it's the voltage. It can be kind of interpreted as a sensivity to reach max power.
My hunch is that when the voltage rail of the power supply doesn't match this value you have to expected a lower peak performance. Also, maybe some kind of distortion depending on how strained the SMPS will become by trying to reach this 65v.

As I said, just guesses. I remembered the Hypex NC400 DIY review where one undersized SMPS was used for two modules and you could see power limiting an earlier than spec distortions.

Interesting, thank you. I'd guess/extrapolate then that a single SMPS600A400 with each 1ET400A, as is the case with the MPA-M400ET, would get it much closer to spec.

I see you have a pair of those in your sig. I've also been running a pair for a while and they are really wonderful amps.
 

anphex

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Interesting, thank you. I'd guess/extrapolate then that a single SMPS600A400 with each 1ET400A, as is the case with the MPA-M400ET, would get it much closer to spec.

I see you have a pair of those in your sig. I've also been running a pair for a while and they are really wonderful amps.
For me by far the best value amps you can currently get. The Benchmark AHB2 is only useful for high efficiency speakers or paired with sub. And let's not talk about that weak ass LA90 - this thing is a SINAD meme in my opinion.
The Purifi takes on everything I throw at it. And boy did I have some sound effects with loudness curve and heavy bass lately. The intro scene of Death Stranding where they are bringing out the body to the cremator has such an incredible explosion sound FX. And I bet those two other far more expensive amps would have gone to their knees then.
 
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ivo.f.doma

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For me by far the best value amps you can currently get. The Benchmark AHB2 is only useful for high efficiency speakers or paired with sub. And let's not talk about that weak ass LA90 - this thing is a SINAD meme in my opinion.
The Purifi takes on everything I throw at it. And boy did I have some sound effects with loudness curve and heavy bass lately. The intro scene of Death Stranding where they are bringing out the body to the cremator has such an incredible explosion sound FX. And I bet those two other far more expensive amps would have gone to their knees then.
For me, I have 8ohm speakers, the performance of the Purifi just seems low compared to, for example, the Ncore500OEM. About 150Watt Purifi vs. about 300W Ncore.
 

anphex

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For me, I have 8ohm speakers, the performance of the Purifi just seems low compared to, for example, the Ncore500OEM. About 150Watt Purifi vs. about 300W Ncore.
What's your efficiency? My speakers are 4 Ohm but have 85dB sensivity, which is considered incredibly low for 4 Ohm but the Purifi still deliver enough to need no subwoofer. Also, if you're picky the Purifi actually have 425 W and not 400 W :D
Then again, as seen in all measurements currently, it's best to run an amp close to clipping for best performance. Running an overpowered amp is a waste of SINAD.
 

ivo.f.doma

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They are Bowers 705S2, HTM72S2 and 707S2. The papers say 84dB surround and 88dB center and L+P. But according to experience, all of them are about 2dB lower. All are rated at 8ohm, but go down to 4.3ohm.
The subwoofer is an active 1200W Velodyne with its own DSP and microphone.
 

Vincentponcet

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They are Bowers 705S2, HTM72S2 and 707S2. The papers say 84dB surround and 88dB center and L+P. But according to experience, all of them are about 2dB lower. All are rated at 8ohm, but go down to 4.3ohm.
The subwoofer is an active 1200W Velodyne with its own DSP and microphone.
88db at 400W 2 meters makes 111db SPL.
That's loud.
200W would make 108dbSPL, still loud
 

ivo.f.doma

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Yes, but as I say, according to the measurements, it's more like 86dB and suround even 82dB, and Purifi gives 200W into 8ohm only with 1% distortion. So I count on an undistorted power of about 150W into 8 ohms. And that is much less acoustic pressure at a sensitivity of 82dB at 8 ohms.
 
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