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Fosi Audio BT30D PRO Bluetooth 5.0 Class D 2.1 Amplifier $79.89 ($78.01 eBay Plus) Delivered @ Fosi Audio eBay

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Fosi Audio BT30D PRO Bluetooth 5.0 Class D 2.1 Amplifier $79.89 ($78.01 eBay Plus) Delivered @ Fosi Audio eBay
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0jay on 30/10/2025 - 13:44 ebay.com.au (1306 clicks)
Last edited 30/10/2025 - 14:15 by 1 other user
OCTGIFT15OCTGIFT17

Fosi gear seems to get a fair bit of stick on OzB and not just because of the Fosi reps, there's always a lot of sniping about real world wattage and whatnot.

What I can tell you is the Texas Instruments TPA3255 chip powering this unit is regarded as a watershed in audio quality and efficiency. This is an upgrade on the previous non pro version.

There are issues re bluetooth being unprotected which means if the unit is on and you do not have a bluetooth device connected anyone can connect via bluetooth and the unit'll switch away from rca and give over to your interloper. The solution is to remove the bluetooth aerial or just switch the unit off when you're not using it I guess.

Plenty of reviews around of units powered by this TI chip

Excludes QLD Far North, WA Remote

I'd guess the voucher'd expire tomorrow

I'll be grabbing one of the many unused quality wireless subs off marketplace for $10 or so and bypassing the inbuilt amp to make use of the sub feature on this unit

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Electrical & Electronics Amplifier Bluetooth Amplifier Fosi Audio

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Comments

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  • 0jay on 30/10/2025 - 13:52

    Thanks @alvian

    • 0jay on 31/10/2025 - 15:52

      the dac is part of the bluetooth soc ats2853 specs in english past the chinese summary

      · Built-in stereo 24-bit input sigma-delta DACs, SNR (A-Weighting)>=100dB, THD+N <= -85dB@0dBFS output amplitude
      · DAC supports sample rate of 8k/11.025k /12k/16k/22.05k/24k/32k/44.1k/48k/88.2k/96kHz

      pretty minimal specs

  • randcn on 30/10/2025 - 14:35
    +1

    Aww man, I just got mine from Amazon a month ago for $109!

    • 0jay on 30/10/2025 - 14:49
      +1

      soz, i've been holding out and it randomly paid off

      $109 for this kind of performance's pretty good value!

      • tjea on 30/10/2025 - 15:10
        +1

        thanks for sharing i grabbed a v3 48v for my bookshelfs with that 15% off code, hope im happy.

        • 0jay on 30/10/2025 - 15:11
          +1

          reviews i've read of the v3 are impressive

  • John Doh on 30/10/2025 - 15:05

    Wow, thats a lot of amp for 78bux. Which 2.1 speakers do you recommend connecting?

    • 0jay on 30/10/2025 - 15:08

      I'm putting things together piecemeal so using an existing set of bookshelf that do a reasonable job of high/mid with a good dac.

      for sub there're a ton of pretty decent wireless subs that folks're selling off from a soundbar, you can bypass the inbuilt amp/receiver and power it off the Fosi for a cheap unit with a decent driver/enclosure for next to nothing

  • bargaino on 30/10/2025 - 15:07

    Good price for a 2.1 amplifier.
    Are passive subwoofers still a thing though? And that enormous external antenna makes it look dated.

    The solution is to remove the bluetooth aerial

    A good chance it still works in the same room.

    • 0jay on 30/10/2025 - 15:09
      +1

      good chance it still works in the same room

      the stream is coming from INSIDE the house!!

      You can build a passive unit from salvaged sub with a burnt out amp or from an unwanted wireless unit

    • Marty131 on 30/10/2025 - 20:49
      +1

      Or rotate it 90 degrees so it's behind the unit.

  • Daniel Plainview on 30/10/2025 - 15:12
    +1

    These are very good little units. Highly recommend. Have a non-BT version (regret not ponying up the extra $$$ for BT) and it's excellent.

  • 2expensive4me on 30/10/2025 - 15:13

    Keeping in mind the power supply here is 32v 5a so the actual power is probably a lot lower than the max capacity, descriptions says 50 Watt x2 +100 Watt but math don't check out. Does that mean if you just have a 2.0 then it will give 80w x2? Don't know.

    If you see them selling a more expensive version I'd assume that's with the beefy power supply.

    • 0jay on 30/10/2025 - 15:16

      Fosi reps are pretty active on audiosciencereview forum, they claim this particular unit can't handle the beefier powersupply that's offered with other models

      if you don't need the sub feature there are other models you can pair with the 48v powersupply like tjea is upstairs there

      • 2expensive4me on 30/10/2025 - 15:20

        Ah that's interesting, then what is required to achieve their claimed 165W x2 + 350W?
        The highest rated I ever saw they have was 48v 10a from v3 mono

        • 0jay on 30/10/2025 - 15:22

          I think they are pretty loose with their claimed outputs and this unit is a little weaker than the TB10D, even with 32V

          I'm not much of a spec freak but there's a fair bit of discussion on these subjects on audiosciencereview

  • Public21 on 30/10/2025 - 15:25
    +1

    Bought this a year ago and paid about $10 more.

    We bought this house a couple of years ago and it has in-ceiling speakers and a passive sub in the wall, so this worked out well to run Plex and another music player through the TV.

    I initially used the Bluetooth, but that just wasn’t as sharp as the optical connection from the TV. Plus there is always a lag with Bluetooth, so the soundtrack was out of sync.

    • 0jay on 30/10/2025 - 15:26

      Yeah I don't expect much from the BT DAC but wireless with video's almost always a bad idea

  • Borg on 30/10/2025 - 15:51
    +1

    Wish Fosi had remotes for their units. Had to look elsewhere as current Fosi is in drawer unused as got fed up having to get up to adjust volume.

    • 0jay on 30/10/2025 - 16:07

      I think models with remote are in the pipeline. i'll be using it with a pi hat dac so can control volume from the lappie/phone but a lot of folks've been requesting a remote feature

      should be able to control volume with a phone over bluetooth tho

  • Naigrabzo on 30/10/2025 - 15:59

    Do these make a loud noise or pop when bluetooth connects??

    • 0jay on 30/10/2025 - 16:03
      +1

      what i've read on the bluetooth is no, no pop just a soft chime to indicate connection

      should probly add tho if you use android then you only get sbc for audio

      • Borg on 30/10/2025 - 16:07
        +2

        I have the Fosi BT20A and no pops, more a soft ping when connecting as a notification. Decent Amps except the lack of a remote.

      • Naigrabzo on 30/10/2025 - 18:38
        +1

        TY

      • Naigrabzo on 30/10/2025 - 18:40

        What do you suggest? APTX? Thanks.

        • 0jay on 30/10/2025 - 18:45
          +1

          i think aptx is marginally better than sbc though from what i understand it was more about connection stability it its first iteration

          if you have high quality files (especially if they're lossless) then you might be best off using something with some version of shareplay via wifi which allows for lossless streaming

          i use a raspberry pi for this but i think you can get amps with this feature integrated

          the upshot though is this unit has only sbc or aac - if you have apple gear that's good but if you use android you might be better off with something else (unless you know how to mod your android unit to use aac)

          having said all that, fosi don't list what dac chip they use in their bluetooth receiver so it may not give you very good audio over bluetooth regardless. it's a bit of a rabbithole in some ways to use bluetooth on gear like this

          • Naigrabzo on 30/10/2025 - 22:02
            +1

            @0jay: Thanks mate. That's very useful info! I didn't know about the differences in bluetooth implementation between the Apple and Android.

  • Joehax on 30/10/2025 - 16:00

    I have a pretty old Onkyo TX-SR343 powering 2 Dali Concept 6 speakers and powered sub. I only use it for PC audio. It's quite bulky and seems overkill. Would this little Fosi unit be a good replacement?

    • 0jay on 30/10/2025 - 16:01

      i reckon it'd be perfect for that use, yeah

    • Gusper on 30/10/2025 - 17:32

      Buy the aiyima a07 with a 48v power supply, you won’t be disappointed especially have the bass and treble adjustments. You don’t need a power sub out so go for more power.

  • TextGoesHere on 30/10/2025 - 16:01
    +1

    Oos

  • jaygriz on 30/10/2025 - 19:18
    +1

    I have one of these from a different brand, looks identical the brand is "Tilear", plugged into some high end PSB floor speakers. The sound quality is incredible.

  • RossRoss on 30/10/2025 - 19:54

    Anyone recommend a good DAC with headphones out to pair with this?

    Inputs for the DAC will primarily be my PC. Headphones are BD DT990 edition for reference.

    Planning to run the BT30D pro with Klipsch passive bookshelves and powered sub.

    • 0jay on 30/10/2025 - 19:57
      +1

      the dac i'll put aside for a second but for powered subs (which you can easily use wi this unit through the pre out socket) you might be better off with something else tbh

      the sub adjustments on this unit will be bypassed using the preout for a powered sub

      • RossRoss on 30/10/2025 - 20:11

        Thanks 0jay. Any recommendations?

    • RossRoss on 30/10/2025 - 20:12

      I was thinking of the Fosi K5 Pro Gaming DAC.

      • 0jay on 30/10/2025 - 20:22
        +1

        to be honest i'm a little bit weirded out that they don't specify the chip, only the frequency and sample rate. it might be fine but for something like this i'd want a bit more information if it were me

        i wouldn't worry too much about pulling the trigger on this voucher btw, there's sure to be another sale on that'll give you time to do some research if you feel like you want to

        otherwise i'm not that well informed. mine has a texas instruments pcm5122 dac chip (32bit/384khz) which tho not top of the line is plenty good enough for my ears and i'm really happy with it

        • RossRoss on 30/10/2025 - 21:27
          +1

          Thanks man, appreciate the info!

          I thought they did, the image shows that it has dual TPA3255 TI chips. And the K5 is running the NE5532 TI chip (24/192) Not that I know much about chips and specs that much.

          I just want to start cheaper and then see how I go before I get too crazy (which I am prone to doing haha).

          • Naigrabzo on 30/10/2025 - 22:03
            +1

            @RossRoss: Dude, depends on your ears. If you are getting old, then you can use crappy gear and not hear it. :)

            • RossRoss on 30/10/2025 - 22:52

              @Naigrabzo: LOL fair call. Nope, not old enough yet for crappy gear!

          • 0jay on 30/10/2025 - 22:20
            +1

            @RossRoss: those 2 chips mentioned are amp circuits, the dac sample rate & freq are mentioned but no part number

  • RossRoss on 31/10/2025 - 14:59
    +1

    Back in stock

  • sudiph on 31/10/2025 - 16:33
    +1

    I bought a cheapass bose 2 dual cube with a passive woofer for 80 bucks or so. I listen to old music a fair bit so the sound felt right.
    Realized need a amp as its not a powered set, but will grab power from amp.
    Went with this. Sounds great, plenty if bass with a klipsch set I have tried once, but this is paired to my bose as ling as I am alive.
    If anyone has anything to say against bose, mind u, the only reason I brought it up is because I have a 200 aud audio system that I am so happy with.

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