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SylphAudio's High-Performance Amplifier Modules (2024 and Beyond)

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SylphAudio

SylphAudio

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any news regarding the ASR review ?
Just small stumbling blocks on the chassis build, so it will get delayed, will update you once it's ready to be shipped.

Small batch will be available soon.
Can only produce small quantities for now.
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FB100 and FB360 soft launch / preorder. shipping will start next week


 

daniboun

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Interesting. I sent you a private message :)
 

daniboun

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voodooless

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FB360 test with LOF550-20B48-C and 20800uF output capacitance.

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Don’t most SMPS’es not like a large capacitance or their output? It should not be needed anyway since these things are regulated. I think the additional budget is better spent on a SMPS with more current capacity.

Edit: spec of this SMPS:
1705481077351.png

So yes, loading it with 20800uF plus whatever is in the amp already has is more than 10x too much.
 
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SylphAudio

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Don’t most SMPS’es not like a large capacitance or their output? It should not be needed anyway since these things are regulated. I think the additional budget is better spent on a SMPS with more current capacity.
Yes, it is not needed, just testing it if it will go into protection or for any abnormal behaviors.

order placed, check your PM
Thanks, our local partner courier will process the shipments tomorrow.
 

312elements

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FB-Ultra prototype first power up test. It works as expected.
Initial sound impression, very open sounding and airy :)

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will these be distributed by audiophonics as well?
 

maty

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If they also distributed Micro Audio SMPS and assembled amplifiers... sales would skyrocket among lovers of very good recordings (not satisfied with "cheap" class D and tweeters), I think.

On a YouTube channel, a DIY with LM3886 (Akitika GT-102) sounds better than the expensive Luxman L590AXII (class A) or Yamaha A-S1100. Although the sound quality is not wonderful, the difference is noticeable.
 

312elements

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I’d love to see MA there too. I’d like to try their SMPS but the long lead times are a turnoff. I’m mostly excited about the FB Ultra though. I really appreciate the fact that @SylphAudio actually listens to their amps during the engineering. While other manufacturers seem to be in a race to the bottom in price, it’s nice to see someone trying to squeeze that last 10% of quality out even if it comes at a small premium.
If they also distributed Micro Audio SMPS and assembled amplifiers... sales would skyrocket among lovers of very good recordings (not satisfied with "cheap" class D and tweeters), I think.

On a YouTube channel, a DIY with LM3886 (Akitika GT-102) sounds better than the expensive Luxman L590AXII (class A) or Yamaha A-S1100. Although the sound quality is not wonderful, the difference is noticeable.
 

Roland68

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On a YouTube channel, a DIY with LM3886 (Akitika GT-102) sounds better than the expensive Luxman L590AXII (class A) or Yamaha A-S1100. Although the sound quality is not wonderful, the difference is noticeable.
I don't trust such comparisons.
Too often I have now experienced that in reality these differences are either negligible or even the other way around.
In terms of sound, the Yamaha A-S1100 is one of the good devices, even if the 1200 is a little better. But the air is already thin there. But an audible difference on YouTube compared to another device?
 

312elements

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@SylphAudio is there an easy or recommended way to implement a gain adjustment pot of some kind on your modules?
 
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FB100 and FB360 have noticeably more bass slam than the FB-ultra LM3886. Class-D still has some advantage on the bass department.
Will expedite the completion of FB100 and FB360 samples so that I can send them to ASR soon.

Still optimizing the parts of the FB-Ultra.
 

daniboun

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Hi amigos,

My Syph Audio ASH-400 project is now online :

 

daniboun

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@SylphAudio > Question for you: knowing that the PA5 provides 83W/4R and 48W/8R with a 144W PSU, how much do you estimate the FB100 with a 400W PSU for 4R and 8R loads ?
 
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Question for you: knowing that the PA5 provides 83W/4R and 48W/8R with a 144W PSU, how much do you estimate the FB100 with a 400W PSU for 4R and 8R loads ?
We'll know once I send the FB100 for ASR test. But it's around 90W to 100W.

TPA325x clips early if it's voltage limited or current limited. Using a regulated high wattage power supply only means that the PSU will not be a bottleneck and prevent the amp from being voltage or current limited. For example, if you'll use an unregulated power supply on TPA325x, and drive it to clipping levels with sine waves, the power supply voltage will sag / drop, so it will clip earlier. If you'll use a regulated low wattage supply, either the power supply will turn off due to overcurrent protection, or the supply's voltage will sag horribly (depends on the implementation, in case of PA5 supply, the PSU clearly still has some headroom, 144W might be a conservative rating like a 30sec to 5min continuous power since it's closed air, and capable of >= 300W for a burst test).

So using a 400W PSU on FB100 only means that the power supply will not be the cause of early clipping. But the output power of FB100 should still be the same. (Compared to using like a 200W rated PSU). You can even get away with a 150W supply if you don't perform sine wave tests or not using the module as a subwoofer since a typical uncompressed music has a high crest factor. The reserve power on the tank capacitors can handle the short term peaks.

For TPA325x amps with PFFB implementation, the 'knee' of the clipping behaves differently, depending on the PFFB implementation, because behaviors near the clipping point are different depending on PFFB stability / design, so some designs will have a higher THD+N near clipping, hence the 'knee' will happen earlier.

The 83W/4R and 48W/8R figures that you've provided are the 'unclipped' power. But if you allow the amps to clip like on CEA-2006/490A, TPA325x amps should have the same output power assuming the power supply that are being used are equal. And that the amp does not shut down. And that the amp is not voltage or current limited, PFFB design clipping behavior, etc, etc...

For TPA325x amp modules with CLIP/FAULT LEDS, once the CLIP LEDS are 'faintly' pulsing, you can know that the amp module output is on the knee of the clipping without using measurement tools.

FB100 clip leds will start to 'faintly pulse' at 20V / 4R which means that the 'knee' of the clipping will be around ~90W to ~100W. Only way to confirm is to have a power vs distortion test. The knee of clipping is the point before the THD+N starts to climb up exponentially. Also not all 4R loads are created equal :D, some do have 4.1ohms, and so on haha. So different test performers will get slightly different results. Even using a 3.8 ohm load vs 4.2 ohm load will have an impact on THD+N results. That's why we want to send our amp to ASR to have a standard reference and so all else will be equal. Same APx555, same load resistor, same environment, etc.. ;)
 
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