HPA-9 (Reference class headphone amp)

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rustydoglim

HPA-9 (Reference class headphone amp)
« on: 29 Oct 2015, 05:42 pm »
[information updated Nov 10]
MSRP $649, shipping Dec 7

The NuPrime HPA-9, a pure Class-A headphone amp and preamp with a non-feedback output stage for low temporal distortion and lifelike sound, supports headphone impedances from 8 ohm to 1K ohm.

Feature & Specification

•   Single End JFET input stage circuitry design provides the very good second harmonics.  And provide high input impedance and ultralow input bias currents.  As well as high S/R.
•   Non feedback output stage design provides low Temporal Distortion.  Given natural sound.
•   Pure Class A headphone amp design.
•   Phono (RIAA) input module: Internal setting to MM or MC.
•   Supporting up to 3 headphones simultaneously. 
•   Maximum headphone impedance support range from 8ohm and up to 1k ohm.  Although many headphones state that the nominal impedance is at 300 Ohms, however, during some frequency (100Hz for instance) the peak impedance is actually at around 700 ~ 800 ohm.
•   DC off set protection.

Inputs:
•   1 x Phono Input
•   2 x Analog Stereo RCA
 
Outputs:
•   1 x 3.5mm headphone/earphone output
•   2 x 6.3mm headphone/earphone output
•   2 x Analog RCA Line out

•   THD+N:  < -110 dB (1 kHz / maximum gain)
•   Frequency Response: 0 Hz to 200KHz (-3dB)
•   Dimensions: (W x H x D): approx. 235 mm x 55 mm x 281 mm
•   Worldwide AC voltage: (90VAC~130VAC // 210VAC~ 250VAC) With Voltage Select Switch
« Last Edit: 10 Nov 2015, 06:10 am by rustydoglim »

Armaegis

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Re: HPA-9 (Reference class headphone amp)
« Reply #1 on: 29 Oct 2015, 07:50 pm »
Is this replacing the HPA-8?

rustydoglim

Re: HPA-9 (Reference class headphone amp)
« Reply #2 on: 31 Oct 2015, 09:57 pm »
We changed the "8" to "9" as we got "carry away" with performance improvement.

mr_bill

Re: HPA-9 (Reference class headphone amp)
« Reply #3 on: 31 Oct 2015, 10:20 pm »
....thin film resistor volume control?

Armaegis

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Re: HPA-9 (Reference class headphone amp)
« Reply #4 on: 2 Nov 2015, 03:27 am »
We changed the "8" to "9" as we got "carry away" with performance improvement.

Very interesting... any teaser pictures for us?

rustydoglim

Re: HPA-9 (Reference class headphone amp)
« Reply #5 on: 3 Nov 2015, 12:51 am »
This is the corrected link: https://picasaweb.google.com/106836432394752820607

I am tempted to offer a 6 month full return guarantee if user ended up buying something better (price from $400 to $5000).  We think this will be THE headphone amp to get for the foreseeable future.  :thumb:
« Last Edit: 4 Nov 2015, 03:23 pm by rustydoglim »

mr_bill

Re: HPA-9 (Reference class headphone amp)
« Reply #6 on: 3 Nov 2015, 02:19 am »
Nothing on that link

John Casler

Re: HPA-9 (Reference class headphone amp)
« Reply #7 on: 4 Nov 2015, 06:36 am »
Nothing on that link

Will PM you a link to try.


John Casler

Re: HPA-9 (Reference class headphone amp)
« Reply #8 on: 4 Nov 2015, 06:43 am »
Very interesting... any teaser pictures for us?

FRONT VIEW

« Last Edit: 8 Nov 2015, 08:03 pm by John Casler »

John Casler

Re: HPA-9 (Reference class headphone amp)
« Reply #9 on: 4 Nov 2015, 06:44 am »
REAR VIEW


« Last Edit: 8 Nov 2015, 08:04 pm by John Casler »

rustydoglim

Re: HPA-9 (Reference class headphone amp)
« Reply #10 on: 4 Nov 2015, 03:23 pm »

Armaegis

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Re: HPA-9 (Reference class headphone amp)
« Reply #11 on: 4 Nov 2015, 11:07 pm »
There's a bunch of products there, but no hpa-9... ?

mervinpearce

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Re: HPA-9 (Reference class headphone amp)
« Reply #12 on: 8 Nov 2015, 03:37 am »

agdev01

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Re: HPA-9 (Reference class headphone amp)
« Reply #13 on: 8 Nov 2015, 06:30 am »
Thanks Mervin, that link worked for me.  Also looks to be some shots of the DAC-9 (guessing name change for DAC-8)   :thumb:.  This is probably a dumb question but type of product is the STA-9?

kevb

Re: HPA-9 (Reference class headphone amp)
« Reply #14 on: 8 Nov 2015, 02:58 pm »
Thanks Mervin, that link worked for me.  Also looks to be some shots of the DAC-9 (guessing name change for DAC-8)   :thumb:.  This is probably a dumb question but type of product is the STA-9?

I will hazard a guess that it is a stereo power amplifier based on their current naming convention.  And I would guess it is based on the power amplifier section of the IDA-8 integrated (which I own) but improved.  And if that is the case, I most likely will be picking one up.   :thumb:

agdev01

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Re: HPA-9 (Reference class headphone amp)
« Reply #15 on: 8 Nov 2015, 06:29 pm »
:duh:

Thanks.  No idea why I didn't see that.


kevb

Re: HPA-9 (Reference class headphone amp)
« Reply #16 on: 8 Nov 2015, 10:41 pm »
:duh:

Thanks.  No idea why I didn't see that.

I'm just guessing here TBH.  And very hopeful.  :)

agdev01

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Re: HPA-9 (Reference class headphone amp)
« Reply #17 on: 9 Nov 2015, 12:53 am »
I'd say your hopes will be well met.  From John post on the pre-order thread:

Quote
the ST-10 at 150wpc x 2, or the soon to arrive ST-8 100wpc x 2 or 200wpc x 1

I am really happy with my ST-10 and how it preforms with my Harbeths and look forward to more info from Jason on how he sees it in comparison to the STA-9 in a dual mono setup.

John Casler

Re: HPA-9 (Reference class headphone amp)
« Reply #18 on: 9 Nov 2015, 01:03 am »
I'd say your hopes will be well met.  From John post on the pre-order thread:

I am really happy with my ST-10 and how it preforms with my Harbeths and look forward to more info from Jason on how he sees it in comparison to the STA-9 in a dual mono setup.

I am not yet at liberty to post numbers, but let me just say, that Jason's suggestion, that the STA-9 and well as the DAC-9 (that they got "carried away" with improvements) is correct.

I can also let slip out a "teaser", the STA-9's numbers are projected to EXCEED those that I posted in that other thread.  :o

In fact, they might be some of the best price/performance specs in High End.

kevb

Re: HPA-9 (Reference class headphone amp)
« Reply #19 on: 9 Nov 2015, 12:02 pm »
I am not yet at liberty to post numbers, but let me just say, that Jason's suggestion, that the STA-9 and well as the DAC-9 (that they got "carried away" with improvements) is correct.

I can also let slip out a "teaser", the STA-9's numbers are projected to EXCEED those that I posted in that other thread.  :o

In fact, they might be some of the best price/performance specs in High End.

I can't wait to hear more!  I have my sights on the DAC-10H/ST10 combo, but finances will prevent that from happening any time soon.   This sounds very tempting....
« Last Edit: 9 Nov 2015, 03:48 pm by kevb »