Singxer’s new flagship power amplifier

[Michal]

@tom.chen
Hi
Why didn't Singxer provide the input sensitivity of the SA-90? Could you share this information with us?
Kind regards

 

[tom.chen]

@tom.chen
It's very rude not to answer when someone asks. Did I offend you?

Sorry, I thought everyone disliked CLASS AB amplifiers, so I haven't been on the forum recently. No offense. There may be a stereo version in the future, which is already planned. However, this will be an integrated amplifier with volume control.

 

[tom.chen]

Wow, those are some impressive power figures! Any word on pricing and a release date? Also, what's the design philosophy behind it? Class D? I'm really curious to see what Singxer comes up with. Keep us posted!

Thank you very much for your interest in SA-90. Actually, this amplifier is mainly designed for desktop HIFI users. They are small and can be used on the desktop. In addition, it has very low noise floor and can be used as an amplifier for planar headphones, but you need another adapter cable.

This is our design intention

 

[tom.chen]

@tom.chen
Hi
Why didn't Singxer provide the input sensitivity of the SA-90? Could you share this information with us?
Kind regards

the SA-90 's sensitivity:
5V RMS at low gain,8ohm;
2.2V RMS at hign gain,8ohm;

same with RCA and XLR.

 

[tom.chen]

Not uncommon. ATI/Monoprice sell the US-built Monolith 2X for $1200. Pumps out 350W with a 500W dynamic. ToneWinner from China sells one with big huge VU meters on it and more claimed power than that for around $1500 shipped. Emotiva is selling the XPA-2 for $1300. That also hits about these numbers.

Easier to "fix" the "problems" in Class AB than Class D (to roughly quote Bruno Putzeys, who would know). Easy to beat Class D, if you get past meaningless nonsense like 1kHz SINAD on amps with no gain. My 25 year old Mackie smokes a Hypex at 15kHz. But most of the big ABs are not great, yet, except some high dollar stuff. No reason the high volume amps couldn't be, too.

We can't make such a low-priced amplifier.
Because we insist on using high-quality components;
such as electrolytic capacitors, we use Japanese or Korean brands, and transistors use ON Semiconductor or Toshiba products.
We use aluminum alloy for the shell.
Of course, there are cheaper alternatives to these components, but they may not be as good quality.

 

[AdrianusG]

Thank you for your post.
We have updated the output power
：
Basic indicators:
Rated power: 90 watts/8 ohms, 180 watts/4 ohms
Maximum power: 122 watts/8 ohms, 202 watts/4 ohms @ 1% THD+N
Ultra low noise level: less than 2.3uV A is weighted, less than 3UV is not weighted @ single ended input low gain
SNR: greater than 140db A weight @ single ended input low gain
THD+N: -110dB A rating of 8 euros and 20 watts;
Damping coefficient: 800 @ 8 ohms

It seems that no one cares about pure analog Class AB amplifiers anymore.

Looks great and promising, now a (also) great Stereo version please

 

[tom.chen]

Space is one reason. Small monoblocks or stereo amps fit well on the desk and the power supplies can be hidden.
Not everyone has the space or wants to set up a HiFi rack in the living room. With these small monoblocks or stereo amps, the entire HiFi system takes up no more space than 3-4 novels.

The important reason is probably the relatively low costs and prices. The TPA325x amplifiers in particular can be developed and manufactured much more cheaply than conventional amplifiers, especially transistor amplifiers. Optimization is also much easier. In addition, there are the small and much cheaper housings and very cheap external single rail switching power supplies.

The significantly higher efficiency with the low heat output could be a third reason. Even if these small devices can reach 40°, which is absolutely fine and does not limit their service life (keyword: unfounded heat hysteria), the heat output is much lower than with full-size amplifiers at 40°.

yes.
If a SMSP and a fan heat sink are used, CLASS AB can also be made into a very small size.

 

[AdrianusG]

yes.
If a SMSP and a fan heat sink are used, CLASS AB can also be made into a very small size.

From the pictures it looks like nice built quality

 

[Roland68]

yes.
If a SMSP and a fan heat sink are used, CLASS AB can also be made into a very small size.

Unfortunately, most users (out of ignorance) have huge reservations and fears about fan-cooled amplifiers.
I have already had a few discussions about this in the forum, but the fear of the fan being audible is too great. It's like speaking against a brick wall.

Your amplifiers will definitely have a higher acceptance among buyers if there is no fan.

 

[Michal]

Sorry, I thought everyone disliked CLASS AB amplifiers, so I haven't been on the forum recently. No offense. There may be a stereo version in the future, which is already planned. However, this will be an integrated amplifier with volume control.

Thank you for your answer. I am a big fan of yours, you are like a breath of fresh wind.

 

[tom.chen]

Unfortunately, most users (out of ignorance) have huge reservations and fears about fan-cooled amplifiers.
I have already had a few discussions about this in the forum, but the fear of the fan being audible is too great. It's like speaking against a brick wall.

Your amplifiers will definitely have a higher acceptance among buyers if there is no fan.

This is strange.
Customers can accept Class D amplifiers with a few hundred kilowatts of noise.
But the fan noise is unacceptable.
In fact, today's silent fans make almost no noise.

 

[tom.chen]

Thank you for your answer. I am a big fan of yours, you are like a breath of fresh wind.

oh,thanks.
hope you have a good day.

 

[Roland68]

This is strange.
Customers can accept Class D amplifiers with a few hundred kilowatts of noise.
But the fan noise is unacceptable.
In fact, today's silent fans make almost no noise.

On the one hand, the fans are so quiet that you can't hear them, especially larger fans (80-150mm), and on the other hand, these fans would only be needed at a volume where the noise of the fan would be quieter than that of the devices anyway, so it doesn't matter, no matter which way you look at it.

But the sight of a 150mm fan in a power amplifier would make most people gasp and their hearts flutter

 

[Michal]

Hi @tom.chen
I have 245V in a mains. Will this be a problem for your amplifier?

 

[tom.chen]

Hi @tom.chen
I have 245V in a mains. Will this be a problem for your amplifier?

Hi
245V is no problem.

 

[Michal]

the SA-90 's sensitivity:
5V RMS at low gain,8ohm;
2.2V RMS at hign gain,8ohm;

same with RCA and XLR.

Hi @tom.chen

If you don't mind, I have a few questions for you.
Which option would be better?
DAC out 2V >>> attenuator >>> high-gain SA-90
or
DAC out 2V >>> preamplifier >>> low-gain SA-90

There may be a stereo version in the future, which is already planned. However, this will be an integrated amplifier with volume control.

Is there a subwoofer output planned for this amplifier version? For many, a subwoofer is a must.
How will volume control be implemented? If on an integrated circuit, please do it on Muses 72323.
Best regards.

 

[tom.chen]

Hi @tom.chen

If you don't mind, I have a few questions for you.
Which option would be better?
DAC out 2V >>> attenuator >>> high-gain SA-90
or
DAC out 2V >>> preamplifier >>> low-gain SA-90


Is there a subwoofer output planned for this amplifier version? For many, a subwoofer is a must.
How will volume control be implemented? If on an integrated circuit, please do it on Muses 72323.
Best regards.

HI
When the SA-90 has low gain, the distortion is lower;
I suggest you use a preamplifier.

I still need to consider the issue of subwoofer output.
The volume is likely to be using relay R2R volume.

 

[Roland68]

Hi @tom.chen

If you don't mind, I have a few questions for you.
Which option would be better?
DAC out 2V >>> attenuator >>> high-gain SA-90
or
DAC out 2V >>> preamplifier >>> low-gain SA-90


Is there a subwoofer output planned for this amplifier version? For many, a subwoofer is a must.
How will volume control be implemented? If on an integrated circuit, please do it on Muses 72323.
Best regards.

HI
When the SA-90 has low gain, the distortion is lower;
I suggest you use a preamplifier.

I still need to consider the issue of subwoofer output.
The volume is likely to be using relay R2R volume.

It now makes much more sense to regulate something like this on the digital side before the D/A conversion. This is much cleaner, more versatile and more powerful, especially when making any kind of adjustments to the chassis, loudspeakers and room, e.g. via FIR filters. It also allows a change in configuration at any time, e.g. to operate a passive loudspeaker actively or partially actively.

 

[RoA]

different sort of market

i think the market for monoblocks at $1,400 usd is going to be limited

let us say you produce a similar power but much lower quality STEREO class a/b power amp for $700 - even that would be a hard sell on the market and here

funnily enough there's a reasonable interest in the Fosi V3 monos - similar power but $250

i like class a/b - i switched from class d back to my old class a/b but its not a common thing to go back

At least these are (probably) likely to last a while.

 

[Michal]

It now makes much more sense to regulate something like this on the digital side before the D/A conversion. This is much cleaner, more versatile and more powerful, especially when making any kind of adjustments to the chassis, loudspeakers and room, e.g. via FIR filters. It also allows a change in configuration at any time, e.g. to operate a passive loudspeaker actively or partially actively.

Could you give some tips on how to best do this?