• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are daily reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Hypex Nilai500DIY Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 4 1.1%
  • 2. Not terrible (postman panther)

    Votes: 13 3.5%
  • 3. Fine (happy panther)

    Votes: 73 19.9%
  • 4. Great (golfing panther)

    Votes: 277 75.5%

  • Total voters
    367

Ealtan

Member
Joined
Sep 17, 2023
Messages
5
Likes
0
Can anyone help me with calculating the Watts of Nilai stereo, (I’m thinking the Audiophonics stereo version) in the lowest gain setting, with just a passive volume-preamp and Holo Audio Cyan Dac connected so that I won’t blow my AN 10”Alnico 8ohm 95db 45 W speakers. At turning up the volume in the half position (12 o’clock) how much watt will it give? I think the xlr output of Holo Cyan is 4volts but it was measured around 2.6 volts in here… I usually listen to music around 90db - 100db from 2.6meters from speakers. I apologize with my technical ignorance… thank you…
 

NTK

Major Contributor
Forum Donor
Joined
Aug 11, 2019
Messages
2,614
Likes
5,683
Location
US East
Can anyone help me with calculating the Watts of Nilai stereo, (I’m thinking the Audiophonics stereo version) in the lowest gain setting, with just a passive volume-preamp and Holo Audio Cyan Dac connected so that I won’t blow my AN 10”Alnico 8ohm 95db 45 W speakers. At turning up the volume in the half position (12 o’clock) how much watt will it give? I think the xlr output of Holo Cyan is 4volts but it was measured around 2.6 volts in here… I usually listen to music around 90db - 100db from 2.6meters from speakers. I apologize with my technical ignorance… thank you…
Welcome to ASR!

Without knowing the exact model (or part number) of the potentiometer used for the volume control in your preamp, it is not possible to know how much attenuation you get at the 12 o'clock position. Below are the input voltage to output power @ 8 ohm curves for the 3 gain settings. Max rated power into 8 ohm is 260 W for the Nilai.

power_output.png
 

Ealtan

Member
Joined
Sep 17, 2023
Messages
5
Likes
0
Welcome to ASR!

Without knowing the exact model (or part number) of the potentiometer used for the volume control in your preamp, it is not possible to know how much attenuation you get at the 12 o'clock position. Below are the input voltage to output power @ 8 ohm curves for the 3 gain settings. Max rated power into 8 ohm is 260 W for the Nilai.

View attachment 312634
Thank you very much. The passive preamp I think to buy is Khozmo Acoustic 10k attenuation. As far as I understand from the graph it’s only around 30 - 33 watts @ 8 ohms in 4volts?
 

NTK

Major Contributor
Forum Donor
Joined
Aug 11, 2019
Messages
2,614
Likes
5,683
Location
US East
Thank you very much. The passive preamp I think to buy is Khozmo Acoustic 10k attenuation. As far as I understand from the graph it’s only around 30 - 33 watts @ 8 ohms in 4volts?
You are welcome!

Yes. With low gain (11.86 dB per Hypex spec sheet) and 4 V input, the maximum power you'll get is 30.7 W @ 8 ohms (output voltage = 15.7 Vrms).

But be aware that the power handling spec of a loudspeaker may not be what you expect. By the standard test method, speaker power handling ratings are measured with pink noise, and so the power handling number they gave is for a pink noise. That means the speakers can handle 45 W of pink noise, but NOT a 45 W single frequency tone of arbitrary frequency (i.e. a speaker rated of 45 W does not mean it can handle a 10 kHz tone of 45 W, and therefore may not survive, for example, a slow 45 W frequency sweep).

Assuming your Khozmo preamp is using their 48 step ladder type attenuator, the top 11 steps are 2 dB per step and the remaining 37 steps are 1 dB per step. This means 0.631X power per step for the first 11 steps and 0.794X power per step for the rest. Below is the power attenuation curve (step 1 is full power = 1X) . You'll have to find out yourselves how many steps is 12 o'clock from full power :)

Khozmo Acoustic.png
power_output_attenuation.png


 

Ealtan

Member
Joined
Sep 17, 2023
Messages
5
Likes
0
You are welcome!

Yes. With low gain (11.86 dB per Hypex spec sheet) and 4 V input, the maximum power you'll get is 30.7 W @ 8 ohms (output voltage = 15.7 Vrms).

But be aware that the power handling spec of a loudspeaker may not be what you expect. By the standard test method, speaker power handling ratings are measured with pink noise, and so the power handling number they gave is for a pink noise. That means the speakers can handle 45 W of pink noise, but NOT a 45 W single frequency tone of arbitrary frequency (i.e. a speaker rated of 45 W does not mean it can handle a 10 kHz tone of 45 W, and therefore may not survive, for example, a slow 45 W frequency sweep).

Assuming your Khozmo preamp is using their 48 step ladder type attenuator, the top 11 steps are 2 dB per step and the remaining 37 steps are 1 dB per step. This means 0.631X power per step for the first 11 steps and 0.794X power per step for the rest. Below is the power attenuation curve (step 1 is full power = 1X) . You'll have to find out yourselves how many steps is 12 o'clock from full power :)

View attachment 312674View attachment 312675

Thank you, really! I’m relieved… Nobody, (including Hypex) gave me this much detailed answer, all I got was “set the gain at the lowest, be careful with the volume, you’ll be fine”
 

NTK

Major Contributor
Forum Donor
Joined
Aug 11, 2019
Messages
2,614
Likes
5,683
Location
US East
Thank you, really! I’m relieved… Nobody, (including Hypex) gave me this much detailed answer, all I got was “set the gain at the lowest, be careful with the volume, you’ll be fine”
Come to think of it, I think I might have misinterpreted the spacings of the steps of the Khozmo attenuator. The spacings could also be reverse of what I showed in post #864. Here are the curves for both interpretations. You should ask Khozmo about it.

power_output_attenuation_2.png
 

Ealtan

Member
Joined
Sep 17, 2023
Messages
5
Likes
0
I’ve mis-calculated my average listening to music level in db as well. It never gets beyond 78db on average reading but it rarely hits 103db on max. So again it’s hard (especially the ignorant ones like me) to specify the need for how much watts do I actually need. Do I have to determine that to average ratings or max ratings?
 

Sokel

Master Contributor
Joined
Sep 8, 2021
Messages
5,582
Likes
5,507
I’ve mis-calculated my average listening to music level in db as well. It never gets beyond 78db on average reading but it rarely hits 103db on max. So again it’s hard (especially the ignorant ones like me) to specify the need for how much watts do I actually need. Do I have to determine that to average ratings or max ratings?
Average to Peak,not Max.
 

peng

Master Contributor
Forum Donor
Joined
May 12, 2019
Messages
5,454
Likes
5,042
Thank you, really! I’m relieved… Nobody, (including Hypex) gave me this much detailed answer, all I got was “set the gain at the lowest, be careful with the volume, you’ll be fine”
That's probably expected, because Hypex has to deal with lots of inquirey, and their first line response may not be a knowledgeable EE or amp designer. NTK, I assume typically only have to answer questions from ASR members, and I think he is a very knowledgeable in electronics, including audio electronics, likely an EE too.:)
 

peng

Master Contributor
Forum Donor
Joined
May 12, 2019
Messages
5,454
Likes
5,042
I’ve mis-calculated my average listening to music level in db as well. It never gets beyond 78db on average reading but it rarely hits 103db on max. So again it’s hard (especially the ignorant ones like me) to specify the need for how much watts do I actually need. Do I have to determine that to average ratings or max ratings?

If you want more accurate, or reliable (relatively speaking) answers, it is always bet to provide the detailed specs of your speakers, you listening distance and targeted SPL (that you have now), then members can do the calculations for you using an online calculator or do their own calculations.

If you do hit 103 dB max., and you don't want your amplifier to clip at that level, that of course you should consider amplifiers that have the rated output well before clipping that can drive your speakers to that level, that is 103 dB, not just 78 dB.
 
Last edited:

Ealtan

Member
Joined
Sep 17, 2023
Messages
5
Likes
0
Average to Peak,not Max.
If you want more accurate, or reliable (relatively speaking) answers, it is always bet to provide the detailed specs of your speakers, you listennig distance and targetd SPL (that you have now), then memebers can do the calculations for you using an online calculator, or their own calculations. Also, most forum people use "watts" in general, but it is actually better to use voltage and current, as loudspeakers are not resistors that follows Ohms law: V = IR and the power forumula P = VI = V^2/R, it basically output in terms of spl in dB proportional to the input voltage, not the power dissipated by the speaker.
My speakers are Audio Nirvana 10'' Alnico drivers (drivers are alone 92.9 db) around 95db in the cabinet, only 45 Watts music power, 30Watts, rated input 8 Ohms. I use them with Velodyn 10QR subwoofer, cross-overed at 45hz. I use Holo Audio Cyan dac, XLR outputs, which is said to be 4 Volts but measured 2.6 Volts in Audioscience review. The Amp i'm currently using is Cherry Maraschino STM king 200 Watt in 8ohms and 22 db gain /3.1 Vin for 400W into 4 Ohms. The speakers are 2.6 meters away from me. And I'm afraid to blow my speakers off. (That's why I'm searching for a class d amp such as Nilai, which I can reduce its gain) My average listening to music levels from listening point are 78db -80db but gets very rarely to 103db - 105db on max. Thank you for your consideration, I really appreciate it...
 

peng

Master Contributor
Forum Donor
Joined
May 12, 2019
Messages
5,454
Likes
5,042
And I'm afraid to blow my speakers off. (That's why I'm searching for a class d amp such as Nilai, which I can reduce its gain) My average listening to music levels from listening point are 78db -80db but gets very rarely to 103db - 105db on max. Thank you for your consideration, I really appreciate it...
Don't worry about that because you can do the following:

Page 45 of the Owner's manual:

1695043024971.png
 

elis739

New Member
Joined
Oct 5, 2023
Messages
3
Likes
2
Hi everyone,
I am ready to pull the trigger and replace my Naim Nait with a class D amp and based on reviews I am thinking of Hypex Nilai. As far as I am concerned, Audiophonics are the only company in Europe selling an assembled stereo amplifier based on Nilai module. Have any of you bought HPA S300NIL? Since no reviews have been posted so far , do you have any comments to make? Furthermore, I am going to use my RME dac as a pre-amp and I would like to know whether there is an adjustable gain or not.
Thank you in advance.
 

NTK

Major Contributor
Forum Donor
Joined
Aug 11, 2019
Messages
2,614
Likes
5,683
Location
US East
Hi everyone,
I am ready to pull the trigger and replace my Naim Nait with a class D amp and based on reviews I am thinking of Hypex Nilai. As far as I am concerned, Audiophonics are the only company in Europe selling an assembled stereo amplifier based on Nilai module. Have any of you bought HPA S300NIL? Since no reviews have been posted so far , do you have any comments to make? Furthermore, I am going to use my RME dac as a pre-amp and I would like to know whether there is an adjustable gain or not.
Thank you in advance.
Welcome to ASR!

The Nilai is designed by Hypex as a very easy to assemble DIY kit for non-professional hobbyists. Anyone half competent should have little problem assembling one and achieve the same performance as the one Amir measured here. Auiophonics should have no problem doing the same.

The gain setting Audiophonics has chosen (21.75 dB) means that the amp will reach its rated power of 525 W (4 ohm load, 1% THD, 1 kHz) with an input of 3.75 Vrms. This gain setting will work very well with RME DACs (or any other balanced output DACs with the standard 4 V output).
 

maty

Major Contributor
Joined
Dec 12, 2017
Messages
4,562
Likes
3,125
Location
Tarragona (Spain)
With good class D amplifiers is very important the preamplifier. DAC+preamp?

Off course, I am talking about to listen to very good recordings, usually orchestral, jazz, folk... physical instruments. Because spend so much money to listen to the usual terrible recordings of current commercial music..

 
Last edited:

Makis

Member
Joined
Oct 17, 2023
Messages
5
Likes
1
Just assembled mine yesterday.
The sound quality with the default "mid gain" setting was quite dark (like underwater), high notes sounded muted and bass sounded less clear
I changed the gain to high and the sound is now brighter.
There previous amp (Crown XLS2500) had variable gain pots on the front and there was a similar effect there too.
My sound path is the following: Pioneer U-05 DAC -> 2X Nilai -> Magnepan 1.7i , xlr interconnects

Can anyone answer why this happens? Why does sound change with amp gain?

P.S. The Crown also sounded great btw albeit only through the speakon connectors not the binding posts, I will have to keep listening now to justify the price difference :)
 

Killingbeans

Major Contributor
Joined
Oct 23, 2018
Messages
4,024
Likes
7,380
Location
Bjerringbro, Denmark.
Can anyone answer why this happens? Why does sound change with amp gain?

It shouldn't. Maybe you have problems with the signal clipping somewhere in the chain, and you're just hearing massive distortion in one of the cases?
 

Julf

Major Contributor
Forum Donor
Joined
Mar 1, 2016
Messages
2,985
Likes
3,977
Location
Amsterdam, The Netherlands
It shouldn't. Maybe you have problems with the signal clipping somewhere in the chain, and you're just hearing massive distortion in one of the cases?
Or the classic thing where something that is louder sounds better...
 

Killingbeans

Major Contributor
Joined
Oct 23, 2018
Messages
4,024
Likes
7,380
Location
Bjerringbro, Denmark.
Much more likely, yes.

I assumed that the levels were matched, but they probably aren't. And then equal-loudness contours can explain the whole "underwater" thing.
 
Top Bottom