Getting most out of a dual chiped TPA3116 class d amp

Discussion in 'Audio Hardware' started by gasolin, Jul 21, 2021.

  1. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    Need some advice

    I bought a Fosi audio BT20A and it came with a 24volt 4.5 a power adapter,supply, i wannt get most out of the am so i consider a 24 volt 6.75 volt smsl power adapter for more power for the bass (speakers are rated at 4 ohm)

    https://www.audiophonics.fr/en/powe...c-to-24v-675a-dc-ad18-compatible-p-12130.html

    Will it make the the bass sound better at normal levels

    I wanna see if theres som reasonable priced short interconnects like 0.3 and 0.5 m rca to rca (same brand and model), is there somthing you can recommend

    0.5 or 0.6 m interconnect is not a problemj to fin, the problems is finding the same cable in 0.3m
     
  2. Agitater

    Agitater Forum Resident

    Location:
    Toronto
    It’s doubtful that the different external power supply at 6.75 amps will make a difference. It’s inexpensive enough to find out for sure, but the class D output section is unlikely to be able to do anything more that it does out of the factory.

    HiFiCables in the UK:

    Fisual Havana Custom Made Stereo Phono / RCA Cable (Pair) - Stereo Phono / RCA - HifiCables - Analogue and Digital Interconnect Specialists

    . . . can have any length of Fisual cable made up. On the linked page, scroll down and click the “custom length” box.

    Fisual makes very good, well made, inexpensive audio cables.
     
    Curiosity likes this.
  3. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    Forgot to mention NOT fisual, it dosn't ship to Denmark,amazon uk and other places in uk is more expensive, taxes,handling fee do to brexit, even amazon uk won't ship to Denmark

    I want an alternative to Cordial https://www.thomann.de/gb/cordial_cfu_03_cc.htm and i don't know if sommercable is a real upgrade relative to cordial https://www.thomann.de/gb/sommer_cable_basic_hbp_c2_03m.htm

    The chip(s) is rated at 26 volt and 7.5volt max and i have no experince with a high current power adater with a dual tpa3116 chiped amp, i just wanna know if i would get cleaner bass if you can call it that, bass and 4 ohm speakers could need more than 4.5 a to be perfect (or as good as it can be)
     
    Last edited: Jul 21, 2021
  4. Ingenieur

    Ingenieur Going with the flow...

    Location:
    PA
    A class D is a voltage source
    Rail voltage ~ to gain

    if your amp has a linear power power supply increasing input will raise power..but not for long. It's sized the receive reactive power back from the load.

    If your amp has a SMPS it needs replaced

    in both cases the onboard supply needs changed and a higher voltage wall wart

    most makers of small class D offer upgrade packages
     
  5. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
  6. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
  7. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    It's nice to see people taking digital amplifiers seriously. When they are well designed they will beat every specification of any analog amplifier ever built.
     
  8. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    The amp i have do sound really good after i have adjusted the treble and bass (not neutral at 12 o'clock)

    I don't notice any unusually sibilance in the highs and power pr channel is as high or higher than any entry level surround recievers,amps in 8 ohm vs my amp in 4 ohm, no pop noise when i turn on/off the amp, the sound is on instantly, no sparks when conneting the power cord, no static noise adjusting the volume, noise, distortion is also surprisingly low,perfect working bt which not can be said abou my more than 7 timer more expensice integrated a/b amp.

    I just want to improve the power supply for up to 100 euros for a 24 voly 6-7 a linear power supply
     
    Last edited: Jul 22, 2021
  9. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    The best way to determine if a higher amperage power supply will make a difference would be to measure the power supply's voltage while it is in operation. If the voltage is dropping more than a few tenths of a volt, then a 24V adapter with a higher current capacity may make a difference. This is something much easier to do with an oscilloscope than a DC voltmeter because the voltage is going to be varying rapidly in synchronization with the audio signal.

    If you're limited to using a voltmeter, I would suggest measuring the AC voltage on the power supply. It should be close to zero when the amplifier is on with no input signal. If the AC voltage on the power supply increases significantly at high volume, then that's an indication that it is insufficient to power the amplifier, and getting one with a higher power rating may help.

    If you happen to be a computer geek like myself and have a spare PC power supply laying around, most of them will have two independent 12V rails that could be connected in series to provide 24V, which might answer your question before you go to the expense of getting a new power supply.
     
  10. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    don't have anything to test my amp with neither do i have an extra power supply, i just wanna have more currnet (if it matters) since i have 4 ohm speakers and to get a little more watt
     
    Last edited: Jul 22, 2021
  11. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    I really doubt it, although 24V @4.5A can only produce a TOTAL power output of 108 Watts (RMS), which is inconsistent with their specification of 2x100 (200 Watts with two 4 Ohm speakers), which is inconsistent with the 320 Watt spec that they immediately follow up with:

    100W Max X 2(4 ohms, 20 Hz - 20 kHz, 0.04% THD), comes with a 24V power supply, can drive 280watts(8 ohms), 320watts(4 ohms) speakers, (For passive speakers only, not the powered speakers.)

    Bluetooth 5.0 Amplifier 2 Channel Stereo Amp Receiver Class D Amplifier for Home Audio System - Fosi Audio BT20A With 24V Power Supply

    Still, I highly doubt that increasing the amperage (and thus power capacity) of your power supply is going to make any difference. If the amp were dragging the power supply down to a voltage that was insufficient for it to operate properly, you would be hearing distortion across all frequencies, and not just a reduced bass response.
     
  12. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    It doesn't say 280 watt in 8 ohm for the chip. it's that they can handle 280 watt rated speakers, that's how i see it

    I think it was an video where i so that a lower psu with high current had more power in 4 ohm with a power supply with higher voltage but lower current
     
  13. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    My digital amp uses a 36V supply and is realistically probably 30-40W per channel (8 ohm), I wouldn't advise going over voltage though, this one is designed for it. You can't do any damage by staying at 24V but increasing the current capacity though.

    I accidentally plugged this 36V supply into a 12V cable modem once. That cable modem is no longer with us.
     
  14. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    It's really all about either losing voltage because the demand on the power supply is is so high that it's causing the rail voltage to drop, which reduces how far the signal can swing (in which case you need more current capacity, because that's going to distort your dynamic range), or if you're just trying to make it a little louder by making a voltage increase. Doing that is going to increase the voltage on every chip in the amp, and staying within the voltage spec of one chip doesn't necessarily mean you haven't exceeded the safe maximum voltage for another.
     
  15. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
  16. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    Some amps can do 2x100 watt

     
    Last edited: Jul 22, 2021
  17. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    That's a really good video. What he's doing isn't difficult, and even if you're not into doing all of the calculations, but would like to see what's happening to the signal under different conditions, you can get an oscilloscope easily for less than 100 dollars that connects to a PC via USB, and the software will do nearly anything his oscilloscope will do. If audio is the only thing you're going to be looking at, then a 20MHz oscilloscope is all you need. Check out the Hantek 6022.
     
  18. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    So i would have to spend 100 dollars to know if i need a max 100 dollar power supply ?
     
  19. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    When it comes to the holy grail of these miniature miracles, I will only say that the best of them don't look like the rest of them.
     
  20. BostonBob

    BostonBob Well-Known Member

    Location:
    Atlanta
    That guy seems to know what he's doing, I'd take his advice.
     
  21. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    Don't wnat to spend what won't be needing, all im looking for is a beefier power supply with 24 volt and min 6 a
     
  22. Silverwolf

    Silverwolf Occasional Esoteric Freak

    I’ve got a class D amp that runs off 15 volts, and the power supply is 3amps. My dynaudio speakers are quite insensitive at 86db/4ohm. I have a small listening space, and a well mastered (i.e not ‘loud’) album can be played at 3 o’clock on the amp and be distortion free and plenty loud! It will go a bit louder without distortion, (on a rare album I’ve maxed it out) but too loud for the space. No problem with bass, there’s more of it (and better) than the Cambridge Audio amp it replaced.
    I contacted the company that makes the amp some years ago to see if more power for the amp would make it a better match for my speakers - I was told that I could max the voltage out at 18 volts, but it cannot go any higher, and amp wise 2.5 minimum and any amount higher is fine and potentially a higher ampage than 3 would be good for very bass heavy music at high volume. I was also told the biggest increase in sound quality would be to change the switching psu for a quality linear psu, even if I got one at the same voltage/amp rating. (And to be fair to them, this was a couple of years before the same company started making them). Sadly I’ve not had the cash to do this, though I was given a work bench linear psu for free to try out - unfortunately it shut itself down if I pushed the volume, but the sound quality at lower volumes was noticeably better - just too low for me!
    So I doubt a few more amps would make that much difference, if any, but a high quality linear psu may increase sound quality across the whole frequency range.
     
    gasolin likes this.
  23. gasolin

    gasolin Well-Known Member Thread Starter

    Location:
    Denmark
    The problem for me is to find one that is plug and play, like these 2 and from europe, for not a lot of money, best would be no more than the price of the amp 90-95 euro or less all included, also is to find one with slightly higher current, i think do to you post in #22 Silverwolf, that 24 volt 5 a would be okay, a little more current (doesn't have to a lot more) not just a linear power supply.

    Audiophonics makes some but they are no where near power full enough for 2x50watt in 4 ohm, aliexpress is outside of europe as well as uk,so one from those ( countrys (china,uk) can add 25% higher price (taxes) and handling fee of 18 pounds or 21-22 euros to the total price.

    First time im using a tpa3116D2 chiped amp and it sounds surprisingly good and power full, must admit that even when my ab amp is over 100 watt rms in 4 ohm and close to 200 watt peak power i don't miss that kind of power(strangely enough), im also surprised of the low noise,distortion im experiencing, not low distortion, overload but thd where the design,type of amp class d, that generally are know to distort more before it runs out of power compared to an ab amp.

    That's why i don't mind spending as much as the amp costs on a linear power supply (and upgrade cables to a higher tier)

    51.7US $ 6% OFF|BRZHIFI 120W linear regulated power supply|Amplifier| - AliExpress

    26.31US $ 6% OFF|WEILIANG AUDIO refer to STUDER900 linear regulated power supply|power 6v|supply powerbreeze audio - AliExpress
     
    Last edited: Jul 22, 2021

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