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Class D Switching Power Amplifiers and Power D/A conversion

Which high powered class d amp ?
Which high powered class d amp ?
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Old 16th October 2019, 12:54 AM   #21
highcut28 is offline highcut28  Malaysia
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Quote:
Originally Posted by xrk971 View Post
Look for 800w 48v SMPS for LED lamps - works very well for TPA3255. Fan is overkill, disconnect it or replace with Noctua unless you plan on running close to full power.

Also, low cost 800w or 1200w DC-DC converters work well too. One reason to go with such oversized supplies allows you to run them well below rating and they won’t get hot under normal usage. The mounting frame is a pretty good passive heatsink.

More examples and their test results with TPA3255 can be found in my thread in GB forum.
Hi XRK971,
Does that PSU have a fan?
Currently i have a Meanwell 48V 600W PSU- very loud fan that i hve disconnected and use with the top cover off - ceiling fan or aircon on - and it works fine.
I need another PSU and like your comments on this one from AliExpress
What is Noctua?
Thanks

Last edited by highcut28; 16th October 2019 at 12:55 AM. Reason: add
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Old 16th October 2019, 02:55 AM   #22
Turbowatch2 is offline Turbowatch2  Germany
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"Noctua" or "Arctic" are brands that have specialized in low noise fans.
Such a fan as exchange for the cheap stock one, maybe with a voltage regulator, keeps air flowing and noise inaudible.

These are standard modification for amps or power supplies that are used in Hifi (living room) audio, if the stock unit is over sized or unregulated.
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Old 16th October 2019, 03:35 AM   #23
highcut28 is offline highcut28  Malaysia
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thank you Turbowatch2
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Old 16th October 2019, 04:01 AM   #24
sychan is offline sychan
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You can try to pickup one of the Icepower 125ASX2 modules from AliExpress (or for about $75 more, an enclosed amp). It is the amp inside the Yamaha WXA-50, which tested extremely well on ASR:
Review and Measurements of Yamaha WXA-50 Streaming Amp | Audio Science Review (ASR) Forum

Quote:
Originally Posted by gasolin75 View Post
Looking at this review The FXAudio 502spros is disapointing and doesn't have much power.

Less than 40 watt pr channel in 4 ohm.

Review and Measurements of Topping TP60 and FX Audio FX502SPro Amps | Audio Science Review (ASR) Forum
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Old 16th October 2019, 06:44 AM   #25
forestsgump is offline forestsgump
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Quote:
Originally Posted by sajunky View Post
Chermann is actually the guy who modded this amp, check his thread. For now you are restricted by the voltage rating of capacitors and you should check the same for on-board regulators. Do not connect higher voltage PSU without checking.
The bundled power adaptor of FX502Spro 4A@24V (i doubt it can give 96W) and that voltage is a joke, would be surprise if it can gives 40W audio without clipping.

I remembering using a meanwell LR150-36 150W voltage adjusted to @32V which gives abt 4.5A supply to FX502Spro. Btw no one with sensible mind would drive at a continuous 80wx2 (heatsink & distortion level need to be considered), that was intended transient peak-music energy.

Sometime back, did a quick survey:-
Amplifier for indoor audio music, would only around 10-20W of pure clean power. Even when factor in a good margin, 50W would be overkill.

Someone yet to give me any understanding when is 100w needed for indoors.
I would consider that only for outdoor purpose.

Last edited by forestsgump; 16th October 2019 at 06:55 AM.
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Old 16th October 2019, 10:47 AM   #26
gasolin75 is offline gasolin75  Denmark
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50 watt woudm't be overkill i have speaker measured to be 85 db where some say 88db is in the low end.

Having more power then you need makes sense in that way that you want more power then you need, to make shure the music your playing always sounds clean and controlled when playing loud, not to play excessive loud.

Added power could also give better control

That's like having 400 horse power instead of 100, just becuase you can go alot faster with 400 horsepower doesn't mean you should,if for some reason you need to, you can, having that kind of power just makes it easier to go fast without using the engine to it's limited.

If possible i also want better sound.

Forestgump try reading this thread (25 pages long) and see if it makes any sense to you
How much amplifier power do I REALLY need? | The Harbeth User Group: The shortest journey to the most realistic sound

Last edited by gasolin75; 16th October 2019 at 10:49 AM.
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Old 16th October 2019, 09:06 PM   #27
Turbowatch2 is offline Turbowatch2  Germany
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A while ago a friend of mine bought such a small 2x50 Watt amp he raved about. He took it to my place and we connected it to a pair of small 2-ways. The sound was fine, showed details, everything clean and tidy, tight bass, fast and well controlled. Nice to hear music with.
At some kind of level, higher than for basic listening, it started to sound some how un-clean. He pointed out that the speakers where at their limit.

Then we took a pair of mono amps that where a bit over sized in the power supply (600W each) rated at 400W rms.
First my fried looked a bit surprised, then he said, "OK, nice trick, where is the sub woofer?" The sound pressure could be pushed much higher, while the positve aspects of the small amp were still there.

IMO small, clean mini amps are fine, as most people do not listen very loud and firm bass leads to trouble with neighbours. So what is the need for strong amps? Maybe, as long as you do not know the difference, you will miss nothing.

Class A sometimes has the same effect, a much more relaxed, easy and effortless sound with great control.
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Old 16th October 2019, 09:50 PM   #28
gasolin75 is offline gasolin75  Denmark
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When i upgrade i try to not just upgrade one thing like sound quality (which is my main reason to upgrade), second is more power, i don't often play loud but when i do it's fantastic having alot of clean power.

Have tried playing really loud and when i just for the fun of it turn the bass up on some electronic music, i wouldn't mind a bit more power, not something extreme, just about double the wattage.


The amp cost with free delivery 40 euros, the same with the preamp, better speaker cable better sound quality (those i had later turned out to be quiet bright sounding), tube preamp better sound, better tubes again better sound and finally using my older hifime usb soundcard and qed graphite perormance interconnect gave my further improvements in the highs as i got from my tube preamp.

I think my amp,preamp sounds amazing for the money, so much i want more, my amp,preamp each cost only 40 euro, if i can get much better sound for only 60-70 euros, im upgrading my amp.

More power would be a very nice bonus

Last edited by gasolin75; 16th October 2019 at 10:17 PM.
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Old 16th October 2019, 10:09 PM   #29
xrk971 is offline xrk971  United States
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Which high powered class d amp ?
Quote:
Originally Posted by highcut28 View Post
Hi XRK971,
Does that PSU have a fan?
Currently i have a Meanwell 48V 600W PSU- very loud fan that i hve disconnected and use with the top cover off - ceiling fan or aircon on - and it works fine.
I need another PSU and like your comments on this one from AliExpress
What is Noctua?
Thanks
I got an 800w smps so that when I disconnected the fan, it can run at 100w and not even get warm as built in passive heatsink effect of the chassis.

A Noctua fan replacement can work if you want to get 400w output. Thats 40w excess get for a 90% efficient smps.

A 100w amp is needed for some speakers that are not efficient. My FAST 10F/RS225 are only 82dB/1watt due to bass falloff from 87dB nominal efficiency. The extra headroom allows speakers to hit mid range crescendos effortlessly. Also, bass kick drums sound accurate and powerful.
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Old 16th October 2019, 10:18 PM   #30
gasolin75 is offline gasolin75  Denmark
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#29

+1
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